FL3102 DFIR Flame Detector Manual - Simark Controls

MODEL FL3102 

Digital Frequency Infra-Red (DFIR) 

Flame Detector 

The information and technical data disclosed in this 

document may be used and disseminated only for the 

purposes and to the extent specifically authorized in 

writing by General Monitors. 

Instruction Manual 07-08 

General Monitors reserves the right to change 

published specifications and designs without prior 

notice. 

MANFL3102 

Part No. 

Revision 

MANFL3102 

D/07-08

Warranty 

Model FL3102 

General Monitors warrants the Model FL3102 to be free from defects in 

workmanship or material under normal use and service within two (2) years from 

the date of shipment. 

General Monitors will repair or replace without charge any such equipment found 

to be defective during the warranty period. Full determination of the nature of, 

and responsibility for defective or damaged equipment will be made by General 

Monitors’ personnel. 

Defective or damaged equipment must be shipped to General Monitors’ plant or 

representative from which the original shipment was made. In all cases this 

warranty is limited to the cost of the equipment supplied by General Monitors. 

The customer will assume all liability for the misuse of this equipment by its 

employees or other personnel. 

All warranties are contingent upon proper use in the application for which the 

product was intended and do not cover products which have been modified or 

repaired with out General Monitors’ approval or which have been subjected to 

neglect, accident, improper installation or application, or on which the original 

identification marks have been re moved or altered. 

Except for the express warranty stated above, General Monitors disclaims all 

warranties with regard to the products sold, including all implied warranties of 

merchantability and fitness and the express warranties stated herein are in lieu of 

all obligations or liabilities on the part of General Monitors for damages including, 

but not limited to, consequential damages arising out of/or in connection with the 

performance of the product. 

Warnings 

WARNING - Through engineering design, testing, manufacturing techniques, and 

rigid quality control, General Monitors supplies the finest flame detection systems 

available. The user must recognize his responsibility for maintaining the flame 

detection system in operational condition. 

WARNING - The Model FL3102 DFIR Flame detector contains components, 

which can be damaged by static electricity. Special care must be taken when 

wiring the system, to ensure that only the connection points are touched. 

SAFETY WARNING - Installation and Maintenance must be carried out by 

suitably skilled and competent personnel only. 

TOXIC, COMBUSTIBLE AND FLAMMABLE GASES & VAPORS ARE VERY 

DANGEROUS. EXTREME CAUTION SHOULD BE USED WHEN THESE 

HAZARDS ARE PRESENT. 

i

System Integrity Verification 


General Monitors mission is to benefit society by providing solutions through 

industry leading safety products, services and systems that save lives and 

protect capital resources from the dangers of hazardous flames, gases and 

vapors. 

The safety products you have purchased should be handled carefully and 

installed, calibrated and maintained in accordance with the respective product 

instruction manual. Remember these products are for your safety. 

To ensure operation at optimum performance, General Monitors recommends 

that certain maintenance items be performed. 

Commissioning Safety Systems 

Before power up, verify wiring, terminal connections and stability of mounting for 

all integral safety equipment including, but not limited to: 

• Power supplies 

• Control modules 

• Field detection devices 

• Signaling / output devices 

• Accessories connected to field and signaling devices 

After the initial application of power (and any factory specified warm-up period) to 

the safety system, verify that all signal outputs, to and from devices and modules, 

are within the manufacturers’ specifications. Initial testing should be performed 

per the manufacturers’ recommendations and instructions. 

Proper system operation should be verified by performing a full, functional test of 

all component devices of the safety system, ensuring that the proper levels of 

alarming occur. 

Fault/Malfunction circuit operation should be verified. 

Periodic Testing of Field Devices 

Periodic testing/calibrating should be performed per the manufacturers’ 

recommendations and instructions. Testing/Calibrating procedures should 

include, but not be limited to: 

• Verify integrity of all optical surfaces and devices 

• For flame detectors, use the appropriate test lamp 

When testing produces results outside of the manufacturers’ specifications, 

replacement of the suspect device(s) should be performed as necessary. 

Maintenance intervals should be independently established through a 

documented procedure, including a Maintenance log maintained by plant 

personnel or third party testing services. 

ii


Periodic System Verification 

The following system verifications should be performed at least annually: 

Verify wiring, terminal connections and stability of mounting for all integral safety 

equipment including, but not limited to: 

• Power supplies 

• Control modules 

• Field detection devices 

• Signaling / output devices 

• Accessories connected to field and signaling devices 

Proper system operation should be verified by performing a full, functional test of 

all component devices of the detection system, ensuring that the proper levels of 

alarming occur. 

Fault/Malfunction circuit operation should be verified. 

Maintenance intervals should be independently established through a 

documented procedure, including a maintenance log maintained by plant 

personnel or third party testing services. 

iii


Quick Start Guide 

1.0 Quick Start Guide 

1.1 Upon Receipt of Equipment 

All items shipped by General Monitors are packed in shock absorbing containers, 

which provide a considerable degree of protection against physical damage. 

When received, the contents should be carefully removed and checked against 

the enclosed packing slip. All subsequent correspondence with General Monitors 

must specify the equipment part number and serial number. 

1.2 Choosing Detector Locations 

Several variables are involved in selecting the locations to install detectors to 

ensure proper flame detection. There are no hard and fast rules defining the 

optimum location. There are some general suggestions that should be 

considered in regard to particular conditions at the site where the unit(s) are 

being installed: 

1.2.1 Detector Field of View 

Each Model FL3102 Flame Detector has a 120° maximum Cone of Vision. This 

Cone has its vertex at the center of the detector (see Figure 1). 

1.2.2 Optical Sensitivity Range 

The distance at which the detector will respond to a flame is a function of the 

intensity of that flame. The maximum distance is 50 feet (15.2m) for a gasoline 

fire with a surface area of 1 square foot (0.92m 2 ). 

1.2.3 Environmental Factors 

• Mounting should be as free from shock and vibration as possible and 

convenient for visual inspection and cleaning. 

• Detectors mounted in dirty atmospheric conditions will require more frequent 

inspection, cleaning, and sensitivity checking. 

• Observe the ambient temperature range for the specific model (see Section 

8.1.4 Environmental Specifications). For outdoor installations or other areas 

exposed to intense, direct solar radiation, the detector may reach 

temperatures well above specifications. For this condition, a cover for shade 

may be required to bring the detector temperature within specifications. As 

with any cover or object near-by, make sure the field-of-view of the detector 

is not obstructed. 

• Avoid conditions of ice build up on the optical detector windows. Complete 

icing-over of the IR detector window can result in fault conditions. 

i



1.3 Detector Installation 

The Model FL3102 Detector is an explosion proof assembly rated for use in 

Class I, Divisions 1 & 2, Group B, C & D, Class II, Group E, F & G, and 

Class III areas. The detector(s) should be mounted pointing downward so that 

dust/moisture will not accumulate on the IR windows. The detector(s) should be 

mounted in locations, which will inhibit people or objects from obscuring the 

detector’s Cone of Vision. 

NOTE – Before installing these units, please read the warning statement on page 

13 of this manual. These units must have a conduit seal installed. 

Mounting hardware should be used as shown in Figures 2 and 3. 

NOTE – The swivel (961-003) is rated for Class I, Div 1 & 2, Groups C & D. Use 

mounting bracket for Group B areas. 

The overall dimensions of the detectors and mounting hardware are shown in 

Figure 4. 

ii



Figure 1 FL3102 Field of View 

iii



Figure 2 Swivel Elbow Drawing 

(Class I, Div 1&2, Groups C&D) 

REF HOLE : 

4X Ø.26[6.6] 

3.75[95.3] 5.00[127.0] 

30° 

30° 

60° 

2.80[71.12] 

4.66[118.4] 

2.80[71.12] 

REAR VIEW 

WALL MOUNTING 

4X M6 X 14 

4X M6 WASHER 

BRACKET ASSEMBLY 

Figure 3 Mounting Bracket Drawing 

(Class I, Div 1&2, Groups B,C&D) 

iv

FIELD TERMINATIONS 



TB2 

TB1 

CHAS GND 1 10 

COM 

ALM C 

2 

9 

COM 

ALM 1 

3 

8 

+24VDC 

ALM 2 

4 

WARN C 5 

7 

6 

+24VDC 

DATA- 

DATA2- 

WARN 1 

WARN 2 

6 

7 

5 

4 

0-20mA 

DATA2+ 

ALMTEST 

FLT C 

8 

3 

RESET 

FLT 1 9 2 

FLT 2 10 1 

DATA+ 

Figure 4 FL3102 Outline Drawing 

WARNING – General Monitors requires that the conduit entry be sealed per the 

Canadian Electrical Code Handbook (Part 1, Section 18-154). Conduit seals 

prevent water from entering the units’ housing through the conduit entry. Water 

entering the housing through the conduit entry will damage the electronics and 

nullify the warranty. 

v



1.4 Terminal Connections 

All wire connections are made through the ¾ NPT openings in the Base 

Assembly to the terminal block (See Figure 7). The Terminal Block is located on 

the Base Assembly (See Figure 8) and accepts 12 AWG to 22 AWG stranded or 

solid-core wire. Each wire should be stripped as shown in Figure 5. 

Figure 5 Wire-Strip Length 

To connect the wire to the Terminal Block, insert the conductor into the 

connection space as shown in Figure 7 and tighten the corresponding screw 

terminal. 

Figure 6 Detector Housing and Base 

vi



Figure 7 Terminal Block Operation 

There are twenty possible terminal connections. 

On this and the following pages is a description and specification for each 

connection. 

1.4.1 Alarm Relay 

TB2, Term 2 = ALARM C 

TB2, Term 3 = ALARM 1 


Description: The connections are to the SPDT ALARM relay. ALARM output is 

time delayed for 2, 4, 8, or 10 seconds. This time delay can be set by RS-485 or 

DIP-switch (see Section 3.5). 

The ALARM output can be normally energized or normally de- energized, 

latching or non- latching, and these options are also set via RS-485 or by 

DIP-switch. (See Section 3.5 Switch Selectable Options) 

Alarm Relay: 

TB2, Term 2 = ALM C = Alarm Common 

Normally de-energized 

TB2, Term 3 = ALM 1 = Normally Closed 

TB2, Term 4 = ALM 2 = Normally Open 

vii



Normally energized 



The ALARM relay contact ratings are 8A @ 250VAC and 8A @ 30VDC. 

CAUTION – For all relay connections see Figure 9. 

Figure 8 Terminal Connections 

1.4.2 Warning Relay 

TB2, Term 5 = WARN C 

TB2, Term 6 = WARN 1 


Description: These connections are to the SPDT WARN relay. The WARN output 

is immediate on the Model FL3102. The WARN output can be normally 

energized or normally de-energized, latching or non-latching. These options are 

also set via RS-485 or by a DIP-switch. (See Section 3.5, Switch Selectable 

Options) 

Warning Relay: 

TB2, Term 5 = WARN C = Warning Common 

viii




TB2, Term 6 = WARN 1 = Normally Closed 

TB2, Term 7 = WARN 2 = Normally Open 




The WARN relay contact ratings are 8A @ 250VAC and 8A @ 30VDC. 


Figure 9 Relay Contacts 

1.4.3 Fault Relay 

TB2, Term 8 = FLT C 

TB2, Term 9 = FLT 1 


Description: These connections are to the SPDT FAULT relay. The FAULT 

output configuration is normally energized and non-latching. This is the standard 

output configuration and it cannot be changed. 

The FAULT circuit will be activated during the time-out function, a low power or 

loss of power condition, and during a failed COPM check. During these 

conditions, the FAULT relays will de-energize and the analog output signal will 

drop to 0 mA (2mA for COPM Faults) for the duration of the FAULT. 

Fault Relay: 

TB2, Term 8 = FLT C = Fault Common 


TB2, Term 9 = FLT 1 = Normally Open 

TB2, Term 10 = FLT 2 = Normally Closed 

The FAULT relay contact ratings are 8A @ 250VAC and 8A @ 30VDC. 


ix



1.4.4 Alarm Reset Terminal 

TB1, Term 3 = RESET 

The RESET, when activated, returns a latched ALARM and/or WARN output, 

that is no longer valid, to its original state. For this RESET function, place one 

contact of a SPST normally open momentary switch to TB1 Terminal 3 and the 

other contact to DC COM (the detector’s common). To activate, just press and 

release the switch. 

1.4.5 Alarm Test Terminal 

TB1, Term 4 = ALARM TEST 

By connecting one contact of a SPST normally open momentary switch to TB1 

terminal 4 and the other contact to DC COM (the detector’s common) the user 

can test the alarm outputs of the Flame Detector by activating this switch for one 

to eight seconds depending on the alarm time delay setting. The Alarm Test will 

activate the WARN and ALARM relay outputs as well as the appropriate analog 

output. The Flame Detector will remain in this state until the switch is released. 

The latching WARN and/or ALARM will have to be RESET manually. The Autotest 

feature cannot be daisy chained between two or more FL3102 Flame 

Detectors. 

1.4.6 Analog Output 

TB1, Term 5 = 0 - 20mA (Analog Output) 

The 0 to 20mA output is a current signal that corresponds to following: 

FAULT signal: 

COPM Fault signal: 

Ready signal: 

WARN signal: 

ALARM signal: 

.0 to 0.2mA 

2.0 + 0.2mA 

4.0 + 0.2mA 

16.0 + 0.2mA 

20.0 + 0.2mA 

The maximum analog output load is 600 ohms. 

Cable Requirements: 

For interfacing with 250 ohm input impedance devices, the following maximum 

cable lengths apply (maximum 50 ohm loop): 

AWG FEET METERS 

14 9000 2750 

16 5800 1770 

18 3800 1160 

20 2400 730 

22 1700 520 

Figure 10 Maximum Cable Lengths 

for 250 Ohm Input 

x



1.4.7 Power 

TB1, Term 7, 8 = +24VDC 

TB1, Term 9, 10 = COM 

These are the power connections. The supply voltage range is 20 to 36VDC at 

the detector (low voltage is detected at 18.5 VDC). The following maximum cable 

lengths apply for a +24VDC supply (maximum 20 ohm loop): 


14 4500 1370 

16 2340 715 

18 1540 470 

20 970 300 

22 670 205 


for +24VDC 

1.4.8 RS-485 OUTPUT 

TB1, Term 1 = DATA+ 

TB1, Term 2 = DATA 

These are the connections for the RS-485 output. The RS-485 connection is 

used to either query the unit’s status or to configure the unit. See Section 

7 for detailed information on Modbus RTU protocol. 

NOTE – If redundant RS-485 output is ordered, then the 0-20mA output is not 

available and the wiring terminals are: 

TB1, Term 5 = DATA2+ 

TB1, Term 6 = DATA2- 

1.4.9 Chassis Ground 

TB2, Term 1 = CHAS GND 

This connection is available for use in wiring that requires a connection to 

chassis ground. In general, all cable lengths specified are maximum values. 

Good design practices dictate cable lengths conservatively shorter than the 

maximum values given. 

xi



1.5 Switch Selectable Options 

All settings on the Model FL3102 are done via a DIP-switch on the Power/Relay 

board or via RS-485 (overrides switch settings). To set these options, remove the 

detector head from the Base Assembly and locate the DIP-switch (see Figure 

12). On the DIP-switch, ON/CLOSED means the switch is pushed in on the side 

labeled ON or CLOSED (opposite the OPEN side). OFF/OPEN means the switch 

is pushed in on the side with the number corresponding to the switch position or 

the side labeled OPEN. (Refer to the tables in Figure 13 for the switch 

assignments.) The settings for the WARN and ALARM outputs have been 

covered in section 3.4. The time delay specifies the amount of time a WARN 

condition persists before an ALARM condition will occur. 

ON 

8 

1 2 3 4 5 6 7 

7 

8 

1 2 3 4 5 6 

OPEN 

PIN 1 

PIN 1 

Figure 12 Dip Switch Location 

OPTION OFF / 

OPEN 

ON / 

CLOSED 

100% Sens – 1 sqft @ 50 ft 1&2 

75% Sens – 1 sqft @ 35 ft 2 1 

50% Sens – 1 sqft @ 25 ft 1 2 

2 Second ALARM Time Delay 3 4 

4 Second ALARM Time Delay 3&4 

8 Second ALARM Time Delay 4 3 

10 Second ALARM Time Delay 3&4 

ALARM non-latching 5 

ALARM latching 5 

WARN non-latching 6 

WARN latching 6 

ALARM normally energized 7 

ALARM normally de-energized 7 

WARN normally energized 8 

WARN normally de-energized 8 

Figure 13 Dip Switch Options 

xii



NOTE - The instrument is now ready to operate! Please consult the manual for 

more information on the instrument’s many features. 

NOTE - If you have any problems in the setup or testing of the detector, please 

refer to the “Troubleshooting Section”, or call the factory direct. 

Worldwide Service is available by calling: 

Lake Forest, California Phone: +1-949-581-4464 

(24 hr. service) Fax: +1-949- 581-1151 

Houston, Texas Phone: +1-281-855-6000 

Fax: +1-281-855-3290 

Ireland Phone: +353-91-751175 

Fax: +353-91-751317 

Singapore Phone: +65-6-748-3488 

Fax: +65-6-748-1911 

United Arab Emirates Phone: +971-4-8815751 

Fax: +971-4-8817927 

United Kingdom Phone: +44-1625-619583 

Fax: +44-1625-619098 

xiii

Table of Contents 


WARRANTY 

WARNINGS 

......................................................................................... I 

......................................................................................... I 

SYSTEM INTEGRITY VERIFICATION ................................................................. II 

1.0 QUICK START GUIDE.............................................................................. I 

1.1 Upon Receipt of Equipment ..........................................................i 

1.2 Choosing Detector Locations ........................................................i 

1.2.1 Detector Field of View ......................................................i 

1.2.2 Optical Sensitivity Range .................................................i 

1.2.3 Environmental Factors .....................................................i 

1.3 Detector Installation......................................................................ii 

1.4 Terminal Connections .................................................................vi 

1.4.1 Alarm Relay................................................................... vii 

1.4.2 Warning Relay.............................................................. viii 

1.4.3 Fault Relay .....................................................................ix 

1.4.4 Alarm Reset Terminal......................................................x 

1.4.5 Alarm Test Terminal ........................................................x 

1.4.6 Analog Output..................................................................x 

1.4.7 Power .............................................................................xi 

1.4.8 RS-485 OUTPUT............................................................xi 

1.4.9 Chassis Ground..............................................................xi 

1.5 Switch Selectable Options.......................................................... xii 

TABLE OF CONTENTS ........................................................................................ 1 

TABLE OF FIGURES ........................................................................................ 5 

2.0 INTRODUCTION ...................................................................................... 7 

2.1 General Description..................................................................... 7 

2.2 Principle of Operation.................................................................. 8 

2.2.1 IR Flame Detector .......................................................... 8 

2.2.2 COPM Circuitry............................................................... 9 

2.2.3 Alarm Test ...................................................................... 9 

2.2.4 Visual Indicators ............................................................. 9 

1


3.0 INSTALLATION ..................................................................................... 10 

3.1 Upon Receipt of Equipment ...................................................... 10 

3.2 Choosing Detector Locations .................................................... 10 

3.2.1 Detector Field of View .................................................. 10 

3.2.2 Optical Sensitivity Range ............................................. 10 

3.2.3 Environmental Factors ................................................. 10 

3.3 Detector Installation................................................................... 11 

3.4 Terminal Connections ............................................................... 15 

3.4.1 Alarm Relay.................................................................. 16 

3.4.2 Warning Relay.............................................................. 17 

3.4.3 Fault Relay ................................................................... 18 

3.4.5 Alarm Test Terminal ..................................................... 19 

3.4.6 Analog Output............................................................... 19 

3.4.7 Power ........................................................................... 20 

3.4.8 RS-485 OUTPUT.......................................................... 20 

3.4.9 Chassis Ground............................................................ 20 

3.5 Switch Selectable Options......................................................... 21 

4.0 MAINTENANCE ..................................................................................... 22 

4.1 General Maintenance ................................................................ 22 

4.2 Cleaning the Lenses.................................................................. 22 

4.3 Sensitivity Check ....................................................................... 23 

4.4 Storage ...................................................................................... 23 

5.0 TROUBLESHOOTING........................................................................... 24 

5.1 Trouble Shooting Chart ............................................................. 24 

5.2 Final Assemblies ....................................................................... 25 

6.0 CUSTOMER SUPPORT......................................................................... 26 

7.0 MODBUS COMMUNICATIONS............................................................. 27 

7.1 Baud Rate.................................................................................. 27 

7.2 Data Format............................................................................... 27 

7.3 MODBUS Read Status Protocol (Query/Response)................. 28 

7.3.1 MODBUS Read Query Message.................................. 28 

7.3.2 MODBUS Read Response Message ........................... 28 

7.4 MODBUS Write Command Protocol (Query/Response)........... 29 

7.4.1 MODBUS Write Query Message.................................. 29 

7.4.2 MODBUS Write Response Message ........................... 29 

7.4.3 Function Codes Supported........................................... 29 

7.5 Exception Responses and Exception Codes ............................ 30 

7.5.1 Exception Responses................................................... 31 

7.5.1.1 Function Code Field ......................................... 31 

7.5.1.2 Exception Code Field ....................................... 31 

7.6 Command Register Locations ................................................... 32 

7.6.1 Operational Mode Commands ..................................... 32 

7.7 FL3102 Operational Mode Command Register Details ............ 35 

7.7.1 Analog .......................................................................... 35 

7.7.2 Mode............................................................................. 35 

7.7.3 Status/Error .................................................................. 35 

7.7.4 Fire Type ...................................................................... 36 

7.7.5 Model Type................................................................... 36 

2

3 


7.7.6 Software Revision ........................................................ 36 

7.7.7 COPM Fault.................................................................. 36 

7.7.8 EEPROM Override ....................................................... 36 

7.7.9 Options ......................................................................... 37 

7.7.10 Comm 1 Address.......................................................... 38 

7.7.11 Comm 1 Baud Rate...................................................... 38 

7.7.12 Comm 1 Data Format................................................... 39 

7.7.13 Fire Window COPM Fault Total (Photodiode).............. 39 

7.7.14 Fire Sensor COPM Fault Total..................................... 40 

7.7.15 Sun COPM Fault Total ................................................. 40 

7.7.16 Remote Reset............................................................... 40 

7.7.17 Remote Alarm Test ...................................................... 40 

7.7.18 Clear COPM Faults ...................................................... 40 

7.7.19 Comm 1 or 2 Total Receive Errors............................... 41 

7.7.20 Comm 1 or 2 Bus Activity Rate % ................................ 41 

7.7.21 Comm 1 & 2 Function Code Errors .............................. 41 

7.7.22 Comm 1 & 2 Starting Address Errors........................... 41 

7.7.23 Comm 1 Only Total Receive Errors ............................. 41 

7.7.24 Comm 1 & 2 RXD CRC Lo Errors ................................ 41 

7.7.25 Comm 1 & 2 RXD CRC Hi Errors................................. 41 

7.7.26 Comm 1 Only Overrun Errors....................................... 41 

7.7.27 Comm 1 Only Noise Flag Errors .................................. 42 

7.7.28 Comm 1 & 2 Framing Errors ........................................ 42 

7.7.29 Comm 1 or 2 Message Interval .................................... 42 

7.7.30 Comm 2 Only Total Receive Errors ............................. 42 

7.7.31 Comm 1 Only SCI Errors.............................................. 42 

7.7.32 Clear Comm 1 & 2 Errors ............................................. 42 

7.7.33 Comm 2 Address.......................................................... 43 

7.7.34 Comm 2 Baud Rate...................................................... 43 

7.7.35 Comm 2 Data Format................................................... 44 

8.0 APPENDIX ...................................................................................... 45 

8.1 Specifications ............................................................................ 45 

8.1.1 System Specifications .................................................. 45 

8.1.1.1 Detector Location ............................................. 45 

8.1.1.2 IR Detector center wavelength (Figure 15) ...... 45 

8.1.1.3 Typical Response Time* .................................. 45 

8.1.1.4 Minimum Response Time................................. 45 

8.1.1.5 Field of Vision* (Figure 16)............................... 45 

8.1.1.6 Sensitivity ......................................................... 45 

8.1.1.7 Maximum Cable Parameters............................ 45 

8.1.1.8 Warranty........................................................... 46 

8.1.2 Mechanical Specifications ............................................ 46 

8.1.3 Electrical Specifications................................................ 46 

8.1.3.1 Supply voltage range (see NOTE) ................... 46 

8.1.3.2 Relay Contact Ratings...................................... 46 

8.1.3.3 RS-485 Output ................................................. 46 

8.1.3.4 Baud Rate ........................................................ 46 

8.1.3.5 RFI/EMI Protection ........................................... 46 

8.1.3.6 Status Indicator ................................................ 46 

8.1.4 Environmental Specifications ....................................... 47 

8.1.4.1 Operating temperature range........................... 47 

8.1.4.2 Storage temperature range .............................. 47


8.1.4.3 Humidity range ................................................. 47 

8.1.5 Modbus RTU Protocol .................................................. 47 

8.2 Approvals................................................................................... 47 

8.3 Spare Parts and Accessories .................................................... 47 

8.3.1 Spare Parts................................................................... 47 

8.3.2 TL103 Test Lamp ......................................................... 48 

8.3.3 Mounting Swivel / Union............................................... 48 

8.3.4 Mounting Bracket ......................................................... 49 

8.3.5 Optical Air Guard.......................................................... 49 

4

Table of Figures 


Figure 1 FL3102 Field of View .............................................................................. iii 

Figure 2 Swivel Elbow Drawing (Class I, Div 1&2, Groups C&D) .........................iv 

Figure 3 Mounting Bracket Drawing (Class I, Div 1&2, Groups B,C&D)...............iv 

Figure 4 FL3102 Outline Drawing ..........................................................................v 

Figure 5 Wire-Strip Length ....................................................................................vi 

Figure 6 Detector Housing and Base ....................................................................vi 

Figure 7 Terminal Block Operation....................................................................... vii 

Figure 8 Terminal Connections ........................................................................... viii 

Figure 9 Relay Contacts........................................................................................ix 

Figure 10 Maximum Cable Lengths for 250 Ohm Input .........................................x 

Figure 11 Maximum Cable Lengths for +24VDC ..................................................xi 

Figure 12 Dip Switch Location.............................................................................. xii 

Figure 13 Dip Switch Options............................................................................... xii 

Figure 14 Model FL3102 ....................................................................................... 7 

Figure 15 Spectral Response of IR Detectors....................................................... 8 

Figure 16 FL3102 Field of View .......................................................................... 12 

Figure 17 Swivel Elbow Drawing (Class I, Div 1&2, Groups C&D) ..................... 13 

Figure 18 Mounting Bracket Drawing (Class I, Div 1&2, Groups B,C&D)........... 13 

Figure 19 FL3102 Outline Drawing ..................................................................... 14 

Figure 20 Wire-Strip Length ............................................................................... 15 

Figure 21 Detector Housing and Base ................................................................ 15 

Figure 22 Terminal Block Operation.................................................................... 16 

Figure 23 Terminal Connections ......................................................................... 17 

Figure 24 Relay Contacts.................................................................................... 18 

Figure 25 Maximum Cable Lengths for 250 Ohm Input ..................................... 19 

Figure 26 Maximum Cable Lengths for +24VDC ............................................... 20 

Figure 27 Dip Switch Location............................................................................. 21 

Figure 28 Dip Switch Options.............................................................................. 21 

Figure 29 IR Windows ......................................................................................... 22 

Figure 30 Troubleshooting Chart......................................................................... 24 

Figure 31 FL3102 (DFIR) Final Assembly........................................................... 25 

Figure 32 Data Format ........................................................................................ 27 

Figure 33 MODBUS Query Messages ................................................................ 28 

Figure 34 MODBUS Read Response Messages ................................................ 28 

Figure 35 MODBUS Write Query Message......................................................... 29 

Figure 36 MODBUS Write Response Message .................................................. 29 

Figure 37 Typical Response Times for FL3102 .................................................. 30 

Figure 38 Exception Responses ......................................................................... 31 

Figure 39 Exception Code Field .......................................................................... 31 

5


Figure 40 Operational Mode Commands ............................................................ 33 

Figure 40 Operational Mode Commands Continued........................................... 34 

Figure 41 Mode ................................................................................................... 35 

Figure 42 Status/Error ......................................................................................... 35 

Figure 43 Model Type.......................................................................................... 36 

Figure 44 EEPROM Override.............................................................................. 37 

Figure 45 Options ................................................................................................ 38 

Figure 46 Comm 1 Baud Rate............................................................................. 38 

Figure 47 Comm 1 Data Format.......................................................................... 39 

Figure 48 Remote Reset ..................................................................................... 40 

Figure 49 Remote Alarm Test ............................................................................. 40 

Figure 50 Clear COPM Faults ............................................................................. 40 

Figure 51 Comm 1 & 2 Errors ............................................................................. 42 

Figure 52 Comm 2 Baud Rate............................................................................. 43 

Figure 53 Comm 2 Data Format.......................................................................... 44 

6

2.0 Introduction 

2.1 General Description 


Fire is a phenomenon of combustion. Combustion is the continuous chemical 

reaction of a reducing agent (fuel) and an oxidizing agent (oxygen, etc.) with the 

evolution of thermal energy (heat). Fire is usually manifested in heat (IR), smoke, 

light (visible), and flame (UV). Flame is the gaseous region of a fire where 

vigorous combustion chain reactions take place. These reactions emit radiation 

covering the Infrared, Ultraviolet and the Visible Spectral Regions. 

The General Monitors Model FL3102 is a Dual Frequency Infrared (DFIR) Flame 

Detector (Figure 14). The Model FL3102 detects the Infrared spectral regions of 

flame to produce a system, which is highly immune to false alarms caused by 

lightning, arc-welding, hot objects, and other sources of radiation. In addition, the 

FL3102 can see through most smoky type fires such as diesel, rubber, etc. 

The Model FL3102 has features that include: 

• Compact unitized design. 

• Continuous optical path monitoring. 

• 0-20mA, alarm relays and MODBUS RTU-485 standard. 

• Wide field of view. 

• High false alarm immunity. 

Figure 14 Model FL3102 

7


2.2 Principle of Operation 

2.2.1 IR Flame Detector 

The Model FL3102 is a discriminating Dual Frequency Infra-Red Detector, which 

makes use of Infrared detectors for different IR wavelengths and characteristics. 

This combination provides a flame detection system, which is highly immune to 

false alarms. 

Incorporated in the IR circuitry is a flicker discrimination circuit. This permits the 

detector to ignore steady static IR sources such as hot objects. The inherent 

flickering of a flame provides the necessary modulation to activate the IR circuit. 

The Model FL3102 Flame Detector processes these IR signals with a 

microcomputer and produces the following outputs: 

• 0 to 20 Milliampere signal. 

• Immediate WARN relay contacts. 

• Time delayed ALARM relay contacts. 

• FAULT relay contacts. 

• RS- 485 MODBUS RTU output. 

• Optional: Redundant RS- 485 Modbus RTU output. 

(See Sections 3 & 4 for more information on detector outputs.) 

Visible Region 

Infrared Region 

IR Detector's 

Spectral 

Sensitivity 

Sun's Radiation 

Reaching the Earth 

Wavelength 

4.35um 

Figure 15 Spectral Response of IR Detectors 

8


2.2.2 COPM Circuitry 

A self- testing feature called Continuous Optical Path Monitoring (COPM) checks 

the optical path, the detector(s), and the related electronic circuitry once every 

minute. If foreign material impairs the optical path of the infrared detector for two 

consecutive checks, the unit will indicate FAULT. The optical FAULT outputs are 

a 2.0 mA signal, de-energizing of the FAULT relay, and RS-485 output signal 

(see Section 3.4 Terminal Connections). After a COPM FAULT, a COPM check 

is performed every ten seconds until the obstruction is removed. Then the COPM 

check will resume a once per minute check. 

WARNING – Dirty or partially blocked windows can significantly reduce the 

detectors field of view and detection distance. 

NOTE – Since the optical path is checked once per minute and it requires two 

check failures to produce a FAULT, it may take up to two minutes for the unit to 

detect an obstruction. 

2.2.3 Alarm Test 

The Model FL3102 Flame Detector has a built-in Alarm Test feature. By 

connecting one contact of a SPST momentary switch to TB1 position 4 and the 

other contact to DC COM (see Section 3.4 Terminal Connections), the user can 

test the alarm outputs of the Flame Detector by activating this switch for one to 

eight seconds depending on the Alarm Delay Setting. The Flame Detector will 

immediately go into WARN and then into the time delayed ALARM. 

After one to eight seconds the Flame Detector will activate the ALARM. A 

latching WARN and/or ALARM will remain latched until manually reset. 

2.2.4 Visual Indicators 

Two light emitting diodes (LED’s) are visible through a window. LED’s are 

provided for a visual indication that corresponds with the detectors’ outputs. The 

following blinking sequence indicates the operation condition: 

• Time out (10 seconds when the unit is first powered) - Green and red LED’s 

blinking alternately. 

• Ready - Green LED that flashes off 1 second, every 10 seconds. 

• WARNing - Slow blinking red LED with green LED on steady. 

• ALARM - Fast blinking red LED with green LED on steady. 

• COPM FAULT - Slow blinking green LED. 

• Low Volt age FAULT - Fast blinking green LED. 

9


3.0 Installation 

3.1 Upon Receipt of Equipment 

All items shipped by General Monitors are packed in shock absorbing containers, 

which provide a considerable degree of protection against physical damage. 

When received, the contents should be carefully removed and checked against 

the enclosed packing slip. All subsequent correspondence with General Monitors 

must specify the equipment part number and serial number. 

3.2 Choosing Detector Locations 

Several variables are involved in selecting the locations to install detectors to 

ensure proper flame detection. There are no hard and fast rules defining the 

optimum location. There are some general suggestions that should be 

considered in regard to particular conditions at the site where the unit(s) are 

being installed: 

3.2.1 Detector Field of View 

Each Model FL3102 Flame Detector has a 120° maximum Cone of Vision. This 

Cone has its vertex at the center of the detector (see Figure 16). 

3.2.2 Optical Sensitivity Range 

The distance at which the detector will respond to a flame is a function of the 

intensity of that flame. The maximum distance is 50 feet (15.2m) for a gasoline 

fire with a surface area of 1 square foot (0.92m 2 ). 

3.2.3 Environmental Factors 

• Mounting should be as free from shock and vibration as possible and 

convenient for visual inspection and cleaning. 

• Detectors mounted in dirty atmospheric conditions will require more frequent 

inspection, cleaning, and sensitivity checking. 

• Observe the ambient temperature range for the specific model (see Section 

8.1.4 Environmental Specifications). For outdoor installations or other areas 

exposed to intense, direct solar radiation, the detector may reach 

temperatures well above specifications. For this condition, a cover for shade 

may be required to bring the detector temperature within specifications. As 

with any cover or object near-by, make sure the field-of-view of the detector 

is not obstructed. 

• Avoid conditions of ice build up on the optical detector windows. Complete 

icing-over of the IR detector window can result in fault conditions. 

10


3.3 Detector Installation 

The Model FL3102 Detector is an explosion proof assembly rated for use in 

Class I, Divisions 1 & 2, Group B, C & D, Class II, Group E, F & G, and 

Class III areas. The detector(s) should be mounted pointing downward so that 

dust/moisture will not accumulate on the IR windows. The detector(s) should be 

mounted in locations, which will inhibit people or objects from obscuring the 

detector’s Cone of Vision. 

NOTE – Before installing these units, please read the warning statement on page 

13 of this manual. These units must have a conduit seal installed. 

Mounting hardware should be used as shown in Figures 17 and 18. 

NOTE – The swivel (961-003) is rated for Class I, Div 1 & 2, Groups C & D. Use 

mounting bracket for Group B areas. 

The overall dimensions of the detectors and mounting hardware are shown in 

Figure 19. 

11


Figure 16 FL3102 Field of View 

12


Figure 17 Swivel Elbow Drawing 

(Class I, Div 1&2, Groups C&D) 

REF HOLE : 

4X Ø.26[6.6] 

3.75[95.3] 5.00[127.0] 

30° 

30° 

60° 

2.80[71.12] 

4.66[118.4] 

2.80[71.12] 

REAR VIEW 

WALL MOUNTING 

4X M6 X 14 

4X M6 WASHER 

BRACKET ASSEMBLY 

Figure 18 Mounting Bracket Drawing 

(Class I, Div 1&2, Groups B,C&D) 

13


FIELD TERMINATIONS 

TB2 

TB1 

CHAS GND 1 10 

COM 

ALM C 

2 

9 

COM 

ALM 1 

3 

8 

+24VDC 

ALM 2 

4 

WARN C 5 

7 

6 

+24VDC 

DATA- 

DATA2- 

WARN 1 

WARN 2 

6 

7 

5 

4 

0-20mA 

DATA2+ 

ALMTEST 

FLT C 

8 

3 

RESET 

FLT 1 9 2 

FLT 2 10 1 

DATA+ 

Figure 19 FL3102 Outline Drawing 

WARNING – General Monitors requires that the conduit entry be sealed per the 

Canadian Electrical Code Handbook (Part 1, Section 18-154). Conduit seals 

prevent water from entering the units’ housing through the conduit entry. Water 

entering the housing through the conduit entry will damage the electronics and 

nullify the warranty. 

14


3.4 Terminal Connections 

All wire connections are made through the ¾ NPT openings in the Base 

Assembly to the terminal block (See Figure 22). The Terminal Block is located on 

the Base Assembly (See Figure 23) and accepts 12 AWG to 22 AWG stranded 

or solid-core wire. Each wire should be stripped as shown in Figure 20. 

Figure 20 Wire-Strip Length 

To connect the wire to the Terminal Block, insert the conductor into the 

connection space as shown in Figure 23 and tighten the corresponding screw 

terminal. 

Figure 21 Detector Housing and Base 

15


Figure 22 Terminal Block Operation 

There are twenty possible terminal connections. 

On this and the following pages is a description and specification for each 

connection. 

3.4.1 Alarm Relay 

TB2, Term 2 = ALARM C 



Description: The connections are to the SPDT ALARM relay. ALARM output is 

time delayed for 2, 4, 8, or 10 seconds. This time delay can be set by RS-485 or 

DIP-switch, (see Section 3.5). 

The ALARM output can be normally energized or normally de- energized, 

latching or non- latching, and these options are also set via RS-485 or by 

DIP-switch. (See Section 3.5, Switch Selectable Options) 

Alarm Relay: 

TB2, Term 2 = ALM C = Alarm Common 







The ALARM relay contact ratings are 8A @ 250VAC and 8A @ 30VDC. 

16



Figure 23 Terminal Connections 

3.4.2 Warning Relay 

TB2, Term 5 = WARN C 



Description: These connections are to the SPDT WARN relay. The WARN output 

is immediate on the Model FL3102. The WARN output can be normally 

energized or normally de-energized, latching or non-latching. These options are 

also set via RS-485 or by a DIP-switch. (See Section 3.5 Switch Selectable 

Options) 

Warning Relay: 

TB2, Term 5 = WARN C = Warning Common 

Normally de- energized 






17


The WARN relay contact ratings are 8A @ 250VAC and 8A @ 30VDC. 


Figure 24 Relay Contacts 

3.4.3 Fault Relay 

TB2, Term 8 = FLT C 



Description: These connections are to the SPDT FAULT relay. The FAULT 

output configuration is normally energized and non-latching. This is the standard 

output configuration and it cannot be changed. 

The FAULT circuit will be activated during the time-out function, a low power or 

loss of power condition, and during a failed COPM check. During these 

conditions, the FAULT relays will de-energize and the analog output signal will 

drop to 0 mA (2mA for COPM Faults) for the duration of the FAULT. 

Fault Relay 

TB2, Term 8 = FLT C = Fault Common 


TB2, Term 9 = FLT 1 = Normally Open 

TB2, Term 10 = FLT 2 = Normally Closed 

The FAULT relay contact ratings are 8A @ 250VAC and 8A @ 30VDC. 


18


3.4.4 Alarm Reset Terminal 

TB1, Term 3 = RESET 

The RESET, when activated, returns a latched ALARM and/or WARN output, 

that is no longer valid, to its original state. For this RESET function, place one 

contact of a SPST normally open momentary switch to TB1 Terminal 3 and the 

other contact to DC COM (the detector’s common). To activate, just press and 

release the switch. 

3.4.5 Alarm Test Terminal 

TB1, Term 4 = ALARM TEST 

By connecting one contact of a SPST normally open momentary switch to TB1 

terminal 4 and the other contact to DC COM (the detector’s common) the user 

can test the alarm outputs of the Flame Detector by activating this switch for one 

to eight seconds depending on the alarm time delay setting. The Alarm Test will 

activate the WARN and ALARM relay outputs as well as the appropriate analog 

output. The Flame Detector will remain in this state until the switch is released. 

The latching WARN and/or ALARM will have to be RESET manually. The Autotest 

feature cannot be daisy chained between two or more FL3102 Flame 

Detectors. 

3.4.6 Analog Output 

TB1, Term 5 = 0 - 20mA (Analog Output) 

The 0 to 20mA output is a current signal that corresponds to following: 

FAULT signal: 

COPM Fault signal: 

Ready signal: 

WARN signal: 

ALARM signal: 

.0 to 0.2mA 

2.0 + 0.2mA 

4.0 + 0.2mA 

16.0 + 0.2mA 

20.0 + 0.2mA 

The maximum analog output load is 600 ohms. 

Cable Requirements: 

For interfacing with 250 ohm input impedance devices, the following maximum 

cable lengths apply (maximum 50 ohm loop): 


14 9000 2750 

16 5800 1770 

18 3800 1160 

20 2400 730 

22 1700 520 


for 250 Ohm Input 

19


3.4.7 Power 

TB1, Term 7, 8 = +24VDC 

TB1, Term 9, 10 = COM 

These are the power connections. The supply voltage range is 20 to 36VDC at 

the detector (low voltage is detected at 18.5 VDC). The following maximum cable 

lengths apply for a +24VDC supply (maximum 20 ohm loop): 


14 4500 1370 

16 2340 715 

18 1540 470 

20 970 300 

22 670 205 


for +24VDC 

3.4.8 RS-485 OUTPUT 

TB1, Term 1 = DATA+ 

TB1, Term 2 = DATA 

These are the connections for the RS-485 output. The RS-485 connection is 

used to either query the unit’s status or to configure the unit. See Section 

7.0 for detailed information on Modbus RTU protocol. 

NOTE – If redundant RS-485 output is ordered, then the 0-20mA output is not 

available and the wiring terminals are: 

TB1, Term 5 = DATA2+ 

TB1, Term 6 = DATA2- 

3.4.9 Chassis Ground 

TB2, Term 1 = CHAS GND 

This connection is available for use in wiring that requires a connection to 

chassis ground. In general, all cable lengths specified are maximum values. 

Good design practices dictate cable lengths conservatively shorter than the 

maximum values given. 

20


3.5 Switch Selectable Options 

All settings on the Model FL3102 are done via a DIP-switch on the Power/Relay 

board or via RS-485 (overrides switch settings). To set these options, remove the 

detector head from the Base Assembly and locate the DIP-switch (see Figure 

27). On the DIP-switch, ON/CLOSED means the switch is pushed in on the side 

labeled ON or CLOSED (opposite the OPEN side). OFF/OPEN means the switch 

is pushed in on the side with the number corresponding to the switch position or 

the side labeled OPEN. (Refer to the tables in Figure 28 for the switch 

assignments.) The settings for the WARN and ALARM outputs have been 

covered in section 3.4. The time delay specifies the amount of time a WARN 

condition persists before an ALARM condition will occur. 

ON 

8 

1 2 3 4 5 6 7 

7 

8 

1 2 3 4 5 6 

OPEN 

PIN 1 

PIN 1 

Figure 27 Dip Switch Location 

OPTION OFF / 

OPEN 

ON / 

CLOSED 

100% Sens – 1 sqft @ 50 ft 1&2 

75% Sens – 1 sqft @ 35 ft 2 1 

50% Sens – 1 sqft @ 25 ft 1 2 

2-Second ALARM Time Delay 3 4 

4-Second ALARM Time Delay 3&4 

8-Second ALARM Time Delay 4 3 

10-Second ALARM Time Delay 3&4 

ALARM non-latching 5 

ALARM latching 5 

WARN non-latching 6 

WARN latching 6 

ALARM normally energized 7 

ALARM normally de-energized 7 

WARN normally energized 8 

WARN normally de-energized 8 

Figure 28 Dip Switch Options 

21

4.0 Maintenance 

4.1 General Maintenance 

Once correctly installed, the unit requires very little maintenance other than 

regular sensitivity checks and cleaning of the lenses. General Monitors 

recommends that a schedule be established and adhered to. 


NOTE – The removal of particulate matter and any film buildup on the lenses and 

light rods is necessary to ensure proper sensitivity of the system. It is 

recommended that the window and light rods be cleaned at least every 30 days 

or more often if the detector is located in a particularly dirty environment. 

4.2 Cleaning the Lenses 

A clean, soft, lint-free cloth, tissue or cotton swab should be used to apply the 

cleaning solution. Do not touch the lenses or light rods with fingers. 

1. Wet the window with the solution. 

2. Rub with a dry, unsoiled cloth until the window is clean. 

3. Completely dry the window. 

4. Repeat steps a, b and c for the light rods. 

(See figure 29). Take care only to clean the uncoated (non - aluminum) areas of 

the light rods. 

WARNING – Dirty or partially blocked windows can significantly reduce the 

detectors field of view and detection distance. DO NOT USE A 

COMMERCIAL GLASS CLEANER OTHER THAN “INDUSTRIAL STRENGTH 

WINDEX® with Ammonia D” 

The lenses are not glass. One IR lens material is quartz and the other IR lens 

material is sapphire. The cleaning solution should be General Monitors’ P/N 

10272-1 (Industrial Strength Windex® with Ammonia D). 

Figure 29 IR Windows 

22


4.3 Sensitivity Check 

To verify that each detector is functioning correctly, a General Monitors’ Test 

Lamp and/or the ALARM TEST function (see section 2.2 Principle of Operation - 

Alarm Test) should be used. See Section 8.3, Spares & Accessories, for details 

on test lamps. 

4.4 Storage 

These Flame Detectors should be stored in a clean, dry area and within the 

temperature and humidity ranges quoted in Section 8.1.4 Environmental 

Specifications. 

23

5.0 Troubleshooting 

5.1 Trouble Shooting Chart 


This section is intended to be a guide in correcting problems, which may arise in 

the field. This section is no all-inclusive, and General Monitors should be 

contacted for assistance if the corrective action listed does not eliminate the 

problem. If equipment or qualified personnel required for various tests are not 

available, it is recommended that the defective unit be returned to General 

Monitors for repair. A complete written description of the problem should be 

included. Be sure to inhibit or disconnect external alarm wiring before making any 

check, which might send the unit into alarm, if an alarm condition will create 

problems. 

NOTE – If the equipment is under warranty, any repairs performed by persons 

other than General Monitors authorized personnel may void the warranty. Please 

read the warranty statement carefully. 

PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION 

Be sure that the +24VDC 

No DC power to the Unit is applied with the correct 

polarity 

No output signal and 

green LED in window is 

off 

No output signal and 

green LED in window is 

rapidly blinking 

Constant 2mA signal 

and green LED in 

window is slowly 

blinking 

Low voltage FAULT 

(voltage at unit is 

approximately 

+18.5VDC) 

COPM FAULT, dirty or 

obscured optical path 

(light rods or windows) 

Figure 30 Troubleshooting Chart 

Be sure that unit is 

powered with at least 

+24VDC under load 

Clean IR windows and 

associated source light 

rods 

24


5.2 Final Assemblies 

Figure 31 FL3102 (DFIR) Final Assembly 

25

6.0 Customer Support 

GENERAL MONITORS’ OFFICES 


Area 

Phone/Fax/Email 

UNITED STATES 

Corporate Office: 

26776 Simpatica Circle 

Lake Forest, CA 92630 

9776 Whithorn Drive 

Houston, TX 77095 

Phone: +1-949-581-4464 

Fax: +1-949-581-1151 

Email: sales@generalmonitors.com 

Phone: +1-281-855-6000 

Fax: +1-281-855-3290 

Email: gmhou@generalmonitors.com 

UNITED KINGDOM 

Heather Close 

Lyme Green Business Park 

Macclesfield, Cheshire, 

United Kingdom, SK11 0LR 

Phone: +44-1625-619583 

Fax: +44-1625-619098 

Email: info@generalmonitors.co.uk 

IRELAND 

Ballybrit Business Park 

Galway, Republic of Ireland 

Phone: +353-91-751175 

Fax: +353-91-751317 

Email: service@gmil.ie 

SINGAPORE 

No. 2 Kallang Pudding Rd. 

#09-16 Mactech Building 

Singapore 349307 

Phone: +65-6-748-3488 

Fax: +65-6-748-1911 

Email: genmon@singnet.com.sg 

MIDDLE EAST 

LOB12, #G20 

P.O. Box 61209 

Jebel Ali, Dubai 

United Arab Emirates 

Phone: +971-4-8815751 

Fax: +971-4-8817927 

Email: gmme@emirates.net.ae 

26

7.0 Modbus Communications 


Standard Model FL3102 Flame Detectors include a Single MODBUS 

Communications Board that is referenced as Comm 1. A Dual MODBUS feature 

is optional, which includes two independent communications channels 

referenced as Comm 1 and Comm 2. 

NOTE - Comm 2 is utilized as a backup communications channel, therefore it is 

not recommended to have both Comm 1 and Comm 2 channels active 

simultaneously. If the dual Comm option is ordered, the Analog output will not be 

available. 

7.1 Baud Rate 

The Baud Rate is a selectable setting via the MODBUS Communications 

Interface. The selectable baud rates are 19.2K, 9600, 4800, or 2400 bits per 

second. 

7.2 Data Format 

The Data Format is a selectable setting via the MODBUS Communications 

Interface. The selectable data formats are as follows: 

Data 

Bits 

Parity Stop Bit Format 

8 None 1 8-N-1 

8 Even 1 8-E-1 

8 Odd 1 8-O-1 

8 None 2 8-N-2 

Figure 32 Data Format 

27


7.3 MODBUS Read Status Protocol (Query/Response) 

7.3.1 MODBUS Read Query Message 

Byte MODBUS Range Referenced to FL3102 

1 st Slave 1-247 * FL3102 ID (Address) 

Address 

2 nd Function 03 Read Holding Registers 

Code 

3 rd Starting 00 Not Used by FL3102 

Address Hi** 

4 th Starting 00-FF (Hex) FL3102 Command Registers 

Address Lo** 

5 th No. of 00 Not Used by FL3102 

Registers Hi 

6 th No. of 01 No. of 16 Bit Registers 

Registers Lo 

7 th CRC Lo 00-FF (Hex) CRC Lo Byte 

8 th CRC Hi 00-FF (Hex) CRC Hi Byte 

Figure 33 MODBUS Query Messages 

NOTE*- Address 0 is reserved for broadcast mode and will not be supported at 

this time. 

NOTE**- Start Address can be a maximum of 9999 Address Locations (0000- 

270E) 

7.3.2 MODBUS Read Response Message 

Byte MODBUS Range Referenced to FL3100, FL31001 

1 st Slave 1-247* (Decimal) FL3102 ID (Address) 

Address 

2 nd Function 03 Read Holding Registers 

Code 

3 rd Byte Count 02 No. of Data Bytes 

4 th Data Hi 00-FF (Hex) FL3102 Hi Byte Status Data 

5 th Data Lo 00-FF (Hex) FL3102 Lo Byte Status Data 



Figure 34 MODBUS Read Response Messages 

NOTE - Address 0 is reserved for broadcast mode and will not be supported at 

this time. 

28


7.4 MODBUS Write Command Protocol (Query/Response) 

7.4.1 MODBUS Write Query Message 


1 st Slave Address 1-247* (Decimal) FL3102 ID (Address) 

2 nd Function Code 06 Preset Single Register 

3 rd Register Address Hi** 00 Not used by FL3102 

4 th Register Address Lo** 00-FF (Hex) FL3102 Command Registers 

5 th Preset Data Hi 00-FF (Hex) FL3102 Hi Byte Command Data 

6 th Preset Data Lo 00-FF (Hex) FL3102 Lo Byte Command Data 



Figure 35 MODBUS Write Query Message 

NOTE* – Address 0 is reserved for broadcast mode and will not be supported at 

this time. 

NOTE** – Register Address can be maximum of 9999 Address Locations (0000- 

270E) 

7.4.2 MODBUS Write Response Message 


1 st Slave Address 1-247*(Decimal) FL3102 ID (Address) 

2 nd Function Code 06 Preset Single Register 

3 rd Register Address Hi** 00 Not used by FL3102 

4 th Register Address Lo** 00-FF (Hex) FL3102 Command Registers 

5 th Preset Data Hi 00-FF (Hex) FL3102 Hi Byte Command Data 

6 th Preset Data Lo 00-FF (Hex) FL3102 Lo Byte Command Data 



Figure 36 MODBUS Write Response Message 

NOTE* - Address 0 is reserved for broadcast mode and is not be supported at 

this time. 

NOTE ** - Register Address can be a maximum of 9999 Address Locations (0000- 

270E) 

7.4.3 Function Codes Supported 

Function Code 03 (Read Holding Registers) is used to read status from the slave 

unit. Function Code 06 (Preset Single Register) is used to write a command to 

the slave unit. 

29

7.5 Exception Responses and Exception Codes 


Baud 

Rate 

(bps) 

In a normal exchange, the master device sends a query to the FL3102. The 

FL3102 receives the query and returns a normal response to the master. If a 

normal communications error occurs, there are 4 possible responses from the 

FL3102: 

1. If the FL3102 does not recognize the query due to a communications error, 

then no response is returned from the FL3102 and the master device will 

eventually process a timeout condition for the query. 

2. If the FL3102 receives the query, but detects a communication error (CRC, 

etc.), then no response is returned from the FL3102 and the master device 

will eventually process a timeout condition for the query. 

3. If the FL3102 receives the query without a communications error, but cannot 

process the response to the master within the master's timeout setting, then 

no response is returned from the FL3102 and the master device will 

eventually process a timeout condition for the query. 

In order to prevent this condition from occurring, the typical response times for 

the FL3102 are listed below: 

Query From 

Master 

(msec) 

Unit 

Response 

Delay Time to 

Query (msec) 

Response 

From Unit 

(msec) 

Master Response 

Delay Time Between 

End of Unit 

Response and Next 

Master 

Query (msec) 

Total 

Response 

Time 

(msec) 

19.2K 4 4 4 100 - 120* 112 – 132 

9600 8 5 8 100 - 120* 121 – 141 

4800 16 6 16 100 - 120* 138 – 158 

2400 32 8 32 100 - 120* 172 – 192 

Figure 37 Typical Response Times for FL3102 

NOTE* - Master Response Delay Time is dependent on the speed of response 

for the Master (DCS, PLC, etc.) Cycle Time can be significantly reduced with a 

faster Master. The 100ms Delay Time was taken from a typical Master, using a 

PC with Intellution Industrial Control Software, which was set at the minimum poll 

time. 

4. If the FL3102 receives the query without a communications error, but 

cannot process it due to reading or writing to a non-existent or illegal FL3102 

Function Code, Illegal Command Starting Address or Register Address, or Illegal 

Data Value, then the FL3102 will return an exception response message 

informing the master of the error. 

The exception response message has two fields that differentiate it from a 

normal response, which is explained in Section 7.5.1. 

30


7.5.1 Exception Responses 


1 st Slave Address 1-247* (Decimal) FL3102 ID (Address) 

2 nd Function Code 83 or 86 (Hex) MSB is set with Function Code 

3 rd Exception Code 01 - 06 (Hex) Appropriate Exception Code (See 

below) 



Figure 38 Exception Responses 

7.5.1.1 Function Code Field 

In a normal response, the FL3102 echoes the function code of the 

original query in the function code field of the response. All the Function 

Codes have a most-significant bit (MSB). In an exception response, the 

FL3102 sets the MSB of the function code to a one (1). With the function 

code’s MSB set, the master can recognize the exception response and 

can process the data field for the exception code from the FL3102 

response message. 

7.5.1.2 Exception Code Field 

In a normal response, the FL3102 returns data and status in the data 

field, which was requested in the query from the master. In an exception 

response, the FL3102 returns an exception code in the data field, which 

describes the FL3102 condition that caused the exception. Below is a list 

of exception codes that are supported by the FL3102: 

Code Name Description 

01 Illegal Function The function code received in the query is not an 

allowable action for the FL3102. 

02 Illegal Data Address The data address received in the query is not an 

allowable address for the FL3102. 

03 Illegal Data Value A value contained in the query data field is not an 

allowable value for the FL3102. 

04 Slave Device Failure An unrecoverable error occurred while the FL3102 

was attempting to perform the requested action. 

05 Acknowledge The FL3102 has accepted the request and is 

processing it, but a long duration of time will be 

required to do so. This response is returned to 

prevent a timeout error from occurring in the 

master. 

06 Device Busy The FL3102 is engaged in processing a longduration 

program command. The master should 

retransmit the message later when the slave is 

free. 

Figure 39 Exception Code Field 

31


7.6 Command Register Locations 

7.6.1 Operational Mode Commands 

See section number listed below and reference Section 7.7 for details of each register. 

32


R - indicates Read Only Access 

R/W - indicates Read/Write Access 

Parameter Function Type Scale 

33 

Acc 

ess 

REG 

Addr 

Master 

I/O 

Addr 

Refer to 

Section 

Analog 0-20mA Current Output Value 16-Bit R 0000 40001 7.7.1 

Mode Indicates Fire Status Mode Value (0-11) R 0001 40002 7.7.2 

Status/Error Indicates Error Bit 8-Bit R 0002 40003 7.7.3 

Fire Type LFF, HFF or both Bit (1,2,3) R 0003 40004 7.7.4 

Model Type Identifies the Model FL3102 Decimal 3102 R 0004 40005 7.7.5 

Software Rev Indicates the Software Revision ASCII 2-Char R 0005 40006 7.7.6 

COPM Fault UV/IR COPM Fault Bit 2-Bit R 0006 40007 7.7.7 

EEPROM 

Set Bit for EEPROM to Override Bit 1-Bit R/W 0007 40008 7.7.8 

Override 

DIPswitch Settings 

Options Indicates Unit Options Bit 8-Bit R/W 0008 40009 7.7.9 

Comm 1 Address Unit Address (Comm 1) Decimal (1-247) R/W 0009 40010 7.7.10 

Hex (01- F7) 

Not Used 000A 40011 

Comm 1 

Baud Rate 

Comm 1 

Data Format 

Indicates present Baud Rate 

(Comm 1) 

(2400, 4800, 9600,19.2K) 

Indicates present Data Format 

(Comm 1) 

(8N-1, 8E-1, 8O-1, 8N-2) 

Value (0-3) R/W 000B 40012 7.7.11 

Value (0 – 3) R/W 000C 4013 7.7.12 

Not Used 000D 4014 

Fire Window Indicates No. of Fire Channel Value 8-Bit R 000E 4015 7.7.13 

COPM Fault Total Window (Photodiode) Faults 

Fire Sensor Indicates Total No. of Fire Value 8-Bit R 000F 40416 7.7.14 

COPM Fault Total Channel Detector COPM Faults 

Sun COPM Fault Indicates Total No. of Sun Value 8-Bit R 1010 4017 7.7.15 

Total 

Channel Window/Detector 

COPM Faults 

Remote Reset Remotely Resets the Alarm Bit 1-Bit R/W 0011 4018 7.7.16 

& Warn Relays 

Remote Alarm Remotely Activates Alarm Test Bit 1-Bit R/W 0012 40419 7.7.17 

Test 

Clear COPM 

Faults 

Clears IR COPM Fault Counters Bit 1-Bit R/W 0013 40020 7.7.18 

Comm 1 & 2 

Total Receive 

Errors 

Comm 1 & 2 

Bus Activity Rate 

% 

Comm 1 & 2 

Function Code 

Errors 

Comm 1 & 2 

Starting Address 

Errors 

Total # of Receive Errors 

(Comm 1 & 2) 

Bus Activity Rate in % of this 

Addressed Node vs. other 

Addressed Nodes (Comm 1 or 2) 

Total # of Function Code 

Errors (Comm 1 & 2) 

Total # of Starting Addresses 


Value 8-Bit R 0020 40033 7.7.19 

Decimal 

Hex 

(0- 

100%) 

(0-64) 

R 0021 40034 7.7.20 

Value 8-Bit R 0022 40035 7.7.21 

Value 8-Bit R 0023 40036 7.7.22 

Figure 40 Operational Mode Commands


R - indicates Read Only Access 

R/W - indicates Read/Write Access 

Parameter Function Type Scale Access 

Comm 1 Only 

Total Receive 

Errors 

Comm 1 & 2 

RXD CRC Lo 

Errors 

Comm 1 & 2 

RXD CRC Hi 

Errors 

Comm 1 Only 

Overrun Errors 

Comm 1 Only 

Noise Flag 

Errors 

Comm 1 & 2 

Framing Errors 

Comm 1 & 2 

Message 

Interval 

Comm 2 Only 

Total Receive 

Errors 

Comm 1 Only 

SCI Interrupt 

Errors 

Total # of Comm 1 Only 

Receive Errors 

Total # of RXD CRC Lo 


Total # of RXD CRC Hi 


Total # of Overrun Errors 

(Comm 1 Only) 

Total # of Noise Flags 

Errors (Comm 1 Only) 

Total # of Framing 


Indicates Comm 1 or 2 

Message Interval in Milliseconds 

Total # of Comm 2 Only 

Receive Errors 

Total # of Serial Comm 

Interface Errors (Comm 1 

Only) 

REG 

Addr 

Master 

I/O 

Addr 

Refer to 

Section 

Value 8-Bit R 0024 40037 7.7.23 

Value 8-Bit R 0025 40038 7.7.24 

Value 8-Bit R 0026 40039 7.7.25 

Value 8-Bit R 1027 40040 7.7.26 

Value 8-Bit R 0028 40041 7.7.27 

Value 8-Bit R 0029 40042 7.7.28 

Value 8-Bit R 002A 40043 7.7.29 

Value 8-Bit R 002B 40044 7.7.30 

Value 8-Bit R 002C 40045 7.7.31 

Clear Comm Clear All Comm 1 & 2 Bit 1-Bit R/W 002D 40046 7.7.32 

1 & 2 Errors Errors 

Not Used 002E 40047 

Comm 2 Address Unit Address (Comm 2) Decimal 

Hex 

(1-247) 

(01-F7) 

R/W 002F 40048 7.7.33 

Comm 2 Baud 

Rate 

Comm 2 Data 

Format 

Indicates present Baud 

Rate 

(Comm 2) 

(2400, 4800, 9600, 19.2K) 

Indicates present Data 

Format (Comm 2) 

(8N-1, 8E-1, 8O-1, 8N-2) 

Value (0-3) R/W 0030 40049 7.7.34 

Value (0-3) R/W 0031 40050 7.7.35 

Figure 40 Operational Mode Commands Continued 

34


7.7 FL3102 Operational Mode Command Register Details 

7.7.1 Analog 

A read returns a value, which is proportional to the 0-20mA output current. The 

current is based on a 16-bit value. The master scaling is 0-65535 decimal, which 

corresponds to the FL3102 scaling, which is 0-20mA. 

7.7.2 Mode 

A read returns the fire status mode of the FL3102. 

Mode 

Decimal 

Value 

Power-up Delay 1 

Warn Non-latching Only 2 

Warn & Alarm Non-Latching 3 

Warn Latching Only 4 

Alarm Latching Only 5 

Warn & Alarm Latching 6 

Ready State (No Fire) 7 

Alarm Test 10 

COPM Fault Detected 11 

Figure 41 Mode 

7.7.3 Status/Error 

A read returns the errors that are occurring now, which are indicated by bit 

position. 

Byte Function Bit Position 

EPROM Checksum 8 

EEPROM Checksum 7 

RAM Test 6 

Low 

Low (24V) Voltage Check 5 

Fire Window COPM 4 

Fire Sensor COPM 3 

Sun COPM 2 

Low (12V) Voltage Check 1 

High 

Reset Line Shorted 8 

Not Used 7-1 

Figure 42 Status/Error 

35


7.7.4 Fire Type 

A read indicates the detection of LFF, HFF or a combination of both when using 

the Model FL3102. 

LFF Only Detected = 01 (Lo Data Byte) 

HFF Only Detected = 02 (Lo Data Byte) 

Combination of Both = 03 (Lo Data Byte) 

High Data Byte Not Used. 

7.7.5 Model Type 

A read returns the Decimal Value 3102, which identifies each particular type of 

unit by model number. 

Model Version Decimal 

Value 

FL3102 

DFIR 

(Digital Frequency Infra-Red) 

3102 

Figure 43 Model Type 

7.7.6 Software Revision 

A read returns the software revision of the FL3102 in 2 ASCII characters. 

(Usually a blank and then a letter revision ex. A, B, C, etc). 

7.7.7 COPM Fault 

A read returns the type of Continuous Optical Path Monitoring (COPM) Fault, 

which is a Fire Window COPM Fault, Fire Sensor COPM Fault or a Sun COPM 

Fault. The Fire Window COPM indicates that the Fire window is dirty and needs 

to be cleaned, or that there is a hardware problem with the Sun Channel 

detection circuitry. 

Fire Window COPM Fault = 01 (Lo Data Byte) 

Sun COPM Fault = 02 (Lo Data Byte) 

Fire Sensor COPM Fault = 04 (Lo Data Byte) 

High Data Byte Not Used. 

7.7.8 EEPROM Override 

A read indicates the status of the EEPROM Override bit. A write command 

changes the state of the EEPROM Override bit. When the EEPROM Override bit 

is enabled, the options for the Detector Sensitivity, Relay Delay, Relay 

Latching/Non-Latching and Relay Energized/Non-Energized features are now 

controlled by the data stored in the EEPROM and are no longer controlled by the 

8-position DIP-switch located on the bottom of the Power/Relay Board. When the 

EEPROM Override bit is disabled the options are under the control of the 8- 

position DIP-switch. The EEPROM Override bit is located in the LSB of the Low 

Data Byte and the High Data Byte is not used. 

36


Function Bit (LSB) Access 

Enable 1 Read/Write 

Disable 0 Read/Write 

Figure 44 EEPROM Override 

EXCEPTION - If an EEPROM error occurs, then the Exception Code 04 (Slave 

Device Failure) is returned. 

NOTE - By grounding the ALARM TEST input during the first 10 seconds of the 2 

minute power-up cycle, the FL3102 will Disable the EEPROM Override and set 

the Bit = 0, enabling the 8-position Dip-switch. The red and green LED’s will flash 

simultaneously while the ALARM TEST input is grounded. The EEPROM 

Override bit will be set to zero and the Dip Switch enabled when the red and 

green LED’s flash alternately after approximately10 seconds, at which time the 

ALARM TEST input can be released from ground. 

7.7.9 Options 

A read returns the status of the settings for the Detector Sensitivity, Relay Delay, 

Relay Latching/Non-Latching and Relay Energized/Non-Energized features 

either from the Options DIP-switch or the EEPROM depending on the setting of 

the EEPROM Override bit listed above. A write command changes the settings 

for the EEPROM only when the EEPROM Override bit is set. 

EXCEPTION - If an attempt to change the EEPROM Options is made while the 

EEPROM Override bit is not set, then the unit shall return an Exception Code 03 

(Illegal Data Value). 

EXCEPTION – If an EEPROM write error occurs, then the Exception Code 04 

(Slave Device Failure) is returned. 

These Functions are indicated on the Low Data Byte and the High Data Byte is 

not used. 

37


Function Bit 

Conditions 

Access 

Position 

Alarm Latched 5 

1 = Latched 

0 = Non-Latched 

Read/Write 

10 8 4 2 Time Delay in Seconds 

Alarm Time Delay 2 4 0 0 1 1 Read/Write 

Alarm Time Delay 1 3 0 1 0 1 Read/Write 

100 75 50 % Sensitivity 

Sensitivity 2 2 0 0 1 Read/Write 

Sensitivity 1 1 (LSB) 0 1 0 Read/Write 

Figure 45 Options 

7.7.10 Comm 1 Address 

A read returns the address of the FL3102. A write changes the address to the 

requested address. The range of the address is 1 to 247 (01 to F7 Hex). After the 

address has been changed to the slave unit, the MODBUS communications will 

cease because the address has changed; therefore the master will have to 

change its query address to the slave’s new address in order to restart the 

communications. 

EXCEPTION - If the EEPROM write error occurs, then the Exception Code 04 


NOTE - By grounding the RESET input during the first 10 seconds of the 2- 

minute power-up cycle, the FL3102 Address will default to 1. The red and green 

LED’s will flash simultaneously while the RESET input is grounded. The address 

will be set to a default of 1 when the red and green LED’s flash alternately after 

approximately 10 seconds, at which time the RESET input can be released from 

ground. 

7.7.11 Comm 1 Baud Rate 

A read returns the baud rate of the FL3102. A write changes the baud rate to the 

requested baud rate. After the baud rate has been changed to the addressed 

unit, the MODBUS communications will cease because the baud rate has 

changed; therefore the master will have to change its baud rate to the slave’s 

new baud rate in order to restart the communications. 

Baud Rate Low Data Byte Access 

19.2K 03 Read/Write 

9600 02 Read/Write 



Figure 46 Comm 1 Baud Rate 

This function is indicated on the Low Data Byte and the High Data Byte is not 

used. 

38

EXCEPTION - If an illegal data value is entered which is not listed above, then 

the Exception Code 03 (Illegal Data Value) is returned. 

EXCEPTION - If an EEPROM write occurs, then the Exception Code 04 (Slave 



NOTE - By grounding the RESET input during the first 10 seconds of the 2 - 

minute power-up cycle, the FL3102 Baud Rate will default to 19.2K. The red and 

green LED’s will flash simultaneously while the RESET input is grounded. The 

Data Format will be set to a default of 8-N-1 when the red and green LED’s flash 

alternately after approximately 10 seconds, at which time the RESET input can 

be released from ground. 

7.7.12 Comm 1 Data Format 

A read returns the Comm 1 data format of the FL3102. A write changes the data 

format to the requested data format. After the data format has been changed to 

the addressed unit, the MODBUS communications may cease or start producing 

Comm errors because the data format has changed; therefore the master will 

have to change its data format to the slave’s new data format in order to restart 

or provide proper communications. 

Data Parity Stop Format 

Low Data 

Byte 

Access 

8 None 1 8-N-1 00 Read/Write 

8 Even 1 8-E-1 01 Read/Write 

8 Odd 1 8-O-1 02 Read/Write 


Figure 47 Comm 1 Data Format 


used. 

NOTE - By grounding the RESET input during the first 10 seconds of the 2- 

minute power-up cycle, the FL3102 Data Format will default to 8-N-1. The red 

and green LED’s will flash simultaneously while the RESET input is grounded. 

The Data Format will be set to a default of 8-N-1 when the red and green LED’s 

flash alternately after approximately 10 seconds, at which time the RESET input 

can be released from ground. 

7.7.13 Fire Window COPM Fault Total (Photodiode) 

A read indicates the number of Fire Channel Window COPM Faults that have 

occurred in the slave device. This fault is usually caused by a dirty Fire Detector 

Window. The maximum count is 255 and then the counter will roll over to zero 

and begin counting again. 

39


7.7.14 Fire Sensor COPM Fault Total 

A read indicates the total number of Fire Channel Sensor COPM Faults that have 

occurred in the slave device. This fault is usually caused by a faulty Fire Channel 

Sensor or Circuitry. The maximum count is 255 and then the counter will roll over 

to zero and begin counting again. 

7.7.15 Sun COPM Fault Total 

A read indicates total number of Sun Channel Window or Sensor COPM Faults 

that occurred in the slave device. The maximum count is 255 and then the 

counter will rollover to zero and begin counting again. 

7.7.16 Remote Reset 

Writing a 1 to the bit activates the Remote Reset function that resets the Alarm 

and Warn Relays. The function is active momentarily and will reset automatically 

after being used. 




Figure 48 Remote Reset 

7.7.17 Remote Alarm Test 

Writing a 1 to the bit activates the Remote Alarm Test function that activates the 

Warn and Alarm relay turn-on along with the Analog current status. Once the 

Alarm Test is complete the function should be disabled by writing a zero to 

Remote Alarm Test and then resetting the Alarm and Warn relays by writing a 

one to the Remote Reset (referenced above). 




Figure 49 Remote Alarm Test 

7.7.18 Clear COPM Faults 

Writing a 1 to the bit activates the Clear COPM Faults function that resets all of 

the Fire Window COPM faults, the Fire Sensor COPM Faults, and the Sun 

COPM Faults. The bit and enable function is active momentarily and will reset to 

disable and zero after being used 




Figure 50 Clear COPM Faults 

40


7.7.19 Comm 1 or 2 Total Receive Errors 

A read indicates the total MODBUS Comm 1 or 2 Receive Errors that occurred in 

the slave device. The maximum count is 255 and then the counter will rollover to 

zero and begin counting again. The total errors are an accumulation of the 

individual Comm errors listed below: 

7.7.20 Comm 1 or 2 Bus Activity Rate % 

A read indicates the Comm 1 or 2 Bus Activity Rate in percent of this Slave's 

addressed node versus other addressed nodes. Range of this value is in hex (0- 

64), which translates to decimal (0-100%). 

7.7.21 Comm 1 & 2 Function Code Errors 

A read indicates the number of Comm 1 & 2 Function Code Errors that occurred 

in the slave device. The maximum count is 255 and then the counter will rollover 


7.7.22 Comm 1 & 2 Starting Address Errors 

A read indicates the number of Comm 1 & 2 Starting Address Errors that 

occurred in the slave device. The maximum count is 255 and then the counter 

will rollover to zero and begin counting again. 

7.7.23 Comm 1 Only Total Receive Errors 

A read indicates the total MODBUS Comm 1 Only Receive Errors that occurred 



7.7.24 Comm 1 & 2 RXD CRC Lo Errors 

A read indicates the number of Comm 1 & 2 RXD CRC Lo Byte Errors that 



7.7.25 Comm 1 & 2 RXD CRC Hi Errors 

A read indicates the number of Comm 1 & 2 RXD CRC Hi Byte Errors that 



7.7.26 Comm 1 Only Overrun Errors 

A read indicates the number of Comm 1 Only Overrun Errors that occurred in the 

slave device. The maximum count is 255 and then the counter will rollover to 

zero and begin counting again. 

NOTE - An overrun error occurs, when the next received byte of data tries to 

overwrite an existing received data byte, which has not been processed. 

Therefore, the next received byte of data is lost. This can be controlled by 

implementing the proper DCS or PLC Error Handling Timing Setting (ex. Reply 

Timeout Setting, Delay Time, and Number of Retries) and proper Baud Rate 

Setting. 

41


7.7.27 Comm 1 Only Noise Flag Errors 

A read indicates the number of Comm 1 Only Noise Flag Errors that occurred in 

the slave device. The maximum count is 255 and then the counter will rollover to 


7.7.28 Comm 1 & 2 Framing Errors 

A read indicates the number of Comm 1 & 2 Framing Errors that occurred in the 

slave device. The maximum count is 255 and then the counter will rollover to 


7.7.29 Comm 1 or 2 Message Interval 

A read indicates the time interval in milliseconds between Comm 1 or 2 Message 

Intervals. The maximum time interval indicated is 255. 

7.7.30 Comm 2 Only Total Receive Errors 

A read indicates the total MODBUS Comm 1 Only Receive Errors that occurred 



7.7.31 Comm 1 Only SCI Errors 

A read indicates the number of Comm 1 Only SCI (Serial Communications 

Interface) Errors that occurred in the slave device. The maximum count is 255 

and then the counter will rollover to zero and begin counting again. 

7.7.32 Clear Comm 1 & 2 Errors 

Writing a 1 to the bit activates the Clear Comm 1 & 2 Errors function which resets 

all of the MODBUS Comm Error counters to zero. The function is active 

momentarily and will reset automatically after being used. 




Figure 51 Comm 1 & 2 Errors 

42


7.7.33 Comm 2 Address 

A read returns the Comm 2 address of the FL3102. A write changes the address 

to the requested address. The range of the address is 1 to 247 (01 to F7 Hex). 

After the address has been changed to the slave unit, the MODBUS 

communications will cease because the address has changed. Therefore, the 

master will have to change its query address to the slave’s new address in order 

to restart the communications. 

EXCEPTION - If the EEPROM write error occurs, then the Exception Code 04 


NOTE - By grounding the RESET input during power-up cycle (approximately 10 

seconds), the FL3102 Address will default to 1. 

7.7.34 Comm 2 Baud Rate 

A read returns the Comm 2 baud rate of the FL3102. A write changes the baud 

rate to the requested baud rate. After the baud rate has been changed to the 

addressed unit, the MODBUS communications will cease because the baud rate 

has changed. Therefore, the master will have to change its baud rate to the 

slave’s new baud rate in order to restart the communications. 

Baud Low Data 

Rate Byte 

Access 

19.2K 03 Read/Write 




Figure 52 Comm 2 Baud Rate 


used. 

EXCEPTION - If an illegal data value is entered which is not listed above, then 

the Exception Code 03 (Illegal Data Value) is returned. 

EXCEPTION - If an EEPROM write occurs, then the Exception Code 04 (Slave 



seconds), the FL3102 Baud Rate will default to 19.2K. 

43


7.7.35 Comm 2 Data Format 

A read returns the Comm 2 data format of the FL3102. A write changes the data 

format to the requested data format. After the data format has been changed to 

the addressed unit, the MODBUS communications may cease or start producing 

Comm errors because the data format has changed. Therefore, the master will 

have to change its data format to the slave’s new data format in order to restart 

or provide proper communications. 

Data Parity Stop Format Low Data Access 

Byte 


8 Even 1 8-E-1 01 Read/Write 

8 Odd 1 8-O-1 02 Read/Write 


Figure 53 Comm 2 Data Format 


used. 


seconds), the FL3102 Data Format will default to 8-N-1. 

44

8.0 Appendix 

8.1 Specifications 


8.1.1 System Specifications 

8.1.1.1 Detector Location 

Class I, Division 1 & 2, Groups B, C & D; 

Class II, Groups E, F & G; Class III 

Eexd - IIB + H2 - T6 

TYPE 4x, IP66/7 

8.1.1.2 IR Detector center wavelength (Figure 15) 

4.35 microns 

8.1.1.3 Typical Response Time* 

< 2 sec. @ 50 ft. 

8.1.1.4 Minimum Response Time 

< 500 ms. 

8.1.1.5 Field of Vision* (Figure 16) 

120° maximum 

*NOTE – Response Times and Field of View data have been derived by testing 

the Model FL3102 Flame Detector with a 1 square-foot gasoline fire. One cup of 

unleaded gasoline on top of a one-inch layer of water was ignited for each test. 

These are typical values and different results may occur depending on the 

variation of each fire. 

8.1.1.6 Sensitivity 

50 feet (15.2m); Maximum distance for a 1 square foot (.092m 2 ) gasoline 

fire to be reliably detected. (For settings see Section 3.5 Switch Selectable 

Options) 

8.1.1.7 Maximum Cable Parameters 

4-20mA Output Signal 

9000 feet (2750 m), maximum 50 Ohms loop, with maximum 250 Ohms 

input impedance of readout unit. 

Remote power supply (see NOTE, page 6) 

3000 feet (930 m), maximum 20 Ohms loop and 24VDC minimum. 

(See Section 3-4 Term. Connections) 

45


8.1.1.8 Warranty 

Two Years 

8.1.2 Mechanical Specifications 

Enclosure material Material (Aluminum): A-356, Optional (Stainless Steel) 

Color 

Finish 

Dimensions 

Height 

Width 

Depth 

Weight 

Red 

Chemical Film per MIL-C-5541, Epoxy Powder Coated 

6.000 in (15.2cm) 

6.000 in (15.2cm) 

5.500 in (14.0cm) 

5 lbs (2.3 kg) AL; 16 lbs (7.3 kg) SS 

8.1.3 Electrical Specifications 

8.1.3.1 Supply voltage range (see NOTE) 

Nominal supply voltage 24Vdc 

Range 

20 to 36Vdc 

Maximum supply current 

150mA 

Maximum output signal load 600 Ohms @ 24 VDC 

Output signal range 

FAULT signal 

COPM fault signal 

Ready signal 

WARN signal 

ALARM signal 

8.1.3.2 Relay Contact Ratings 

8A @ 250VAC, 

8A @ 30VDC, 

Resistive MAX. 

8.1.3.3 RS-485 Output 

Modbus RTU 

128 units in series MAX. 

(247 units with repeaters) 

0 to 20mA 

0 to 0.2mA 

2.0 mA + 0.2mA 

4.0 + 0.2mA 

16.0 + 0.2mA 

20.0 + 0.2mA 

8.1.3.4 Baud Rate 

2400, 4800, 9600 or 19200 BPS 

(See Terminal Connections 3-4 for Alarm Output Connections) 

8.1.3.5 RFI/EMI Protection 

Complies with EN50081-1, EN50082-1 

8.1.3.6 Status Indicator 

Two LED’s indicate status, fault conditions. 

46


8.1.4 Environmental Specifications 

8.1.4.1 Operating temperature range 

-40°F to 176°F 

-40°C to 75°C 

8.1.4.2 Storage temperature range 

-40°F to 176°F 

-40°C to 75°C 

8.1.4.3 Humidity range 

0 to 100% RH, non-condensing 

8.1.5 Modbus RTU Protocol 

For detailed information on data format, read commands, write commands, 

register details, register locations, refer to the Appendix beginning on page 26. 

8.2 Approvals 

CSA approved, Cenelec & CE Marking pending 

8.3 Spare Parts and Accessories 

8.3.1 Spare Parts 

When ordering Spare Parts and/or Accessories, please contact your nearest 

General Monitors’ Representative or General Monitors directly and give the 

following information: 

1. Part Number 

2. Description 

3. Quantity 

Item Description Part # 

1 Lamp, IR Source 70596-2 

2 IR Detector, CO 2 71064-1 

3 IR Detector, Sun 71064-2 

4 Window Cleaning Solution 10272-1 

5 Swivel Elbow 961-003 

6 Union 961-004 

7 Bracket Assembly 71172-1 

8 Instruction Manual MANFL3102 

9 TL103 UV/IR Test Lamp TL103-1-2 

10 Optical Air Guard 71250-1 

47


8.3.2 TL103 Test Lamp 

Due to the advanced discrimination in the Model FL3102, the Model TL103 Test 

Lamp was developed. The General Monitors’ TL103 Test Lamp is a battery 

operated, rechargeable, test source specifically designed to test General 

Monitors’ IR Flame Detection Systems. It consists of a high-energy broad band 

radiation source which emits sufficient energy in the Infra-Red spectra to activate 

the IR detector. To simulate a fire, the test lamp automatically flashes at one of 

three DIP-switch selectable rates. The Model TL103, rated explosion proof, is 

CSA certified for use in Class I, Division 1, Groups C and D areas. The test lamp 

operates on internal lead-acid batteries which, when fully charged, will operate 

continuously for 25 to 30 minutes. An internal circuit will prevent operation when 

the batteries are low. 

Operating Instructions 

It is always important to begin a series of flame detector checks with a fully 

charged TL103. Stand within 10 feet (FL3102) from the unit to be tested and aim 

the TL103 directly into the detector windows. Press the ON button and be sure 

the high intensity pulsing beam strikes the detector face squarely. Shaking the 

lamp from side to side or up and down will increase the simulation of flame 

flicker, and improve the response of the flame detector to the lamp. If the system 

is operating normally, the control module will go into a WARNing condition after a 

few flashes of the Test lamp. If the lamp remains ON for the period set by the 

Time Delay Adjustment, the controller will go into ALARM. 

To conserve charge, do not operate the Test Lamp longer than is necessary to 

test each channel. 

When the battery level drops below the level required to maintain the proper 

intensity of the lamp, an internal low voltage circuit will shut the lamp off until the 

battery has been recharged. 

Recharging Instructions 

NOTE – Charging must be carried out in a non-hazardous area. The charging 

receptacle is located inside the housing adjacent to the ON button. To gain 

access, it is necessary to unscrew the knurled plug from the body of the unit. The 

plug is secured to the ON button by a safety strap to keep it from being lost. 

Insert the charging plug into the receptacle. Complete recharging takes fourteen 

hours, minimum. IMPORTANT: Replace the knurled plug after charging is 

complete. 

It is recommended that the TL103 be kept on charge when not in use to prevent 

excessive battery discharge. The batteries may be charged an average of 500 

times and the battery pack is replaceable. 

8.3.3 Mounting Swivel / Union 

A mounting swivel and union are available to connect ¾” conduit into the base of 

the Model FL3102. The swivel design allows for optical alignment adjustments for 

the Model FL3102 when using rigid conduit. 

48


NOTE – Swivel is only rated for Class I, Div 1 & 2, Groups C & D areas. For 

Group B areas, use mounting bracket. 

8.3.4 Mounting Bracket 

A mounting bracket is available to mount the FL3102 to a wall, pole, etc. The 

mounting bracket design allows for optical alignment adjustments for the Model 

FL3102 when installed to a fixed installation. 

8.3.5 Optical Air Guard 

An optical air guard is available for applications such as paint spray booths, 

which require a method to keep detector optics clean. 

This air guard mounts at the front of the FL3102 and has a connection for shop 

air. The air when turned on creates an air wall to keep optics clean. 

49


ADDENDUM 

Product Disposal Considerations 

This product may contain hazardous and/or toxic substances. 

EU Member states shall dispose according to WEEE regulations. For further General Monitors’ 

product WEEE disposal information please visit: 

www.generalmonitors.com/customer_support/faq_general.html 

All other countries or states: please dispose of in accordance with existing federal, state and local 

environmental control regulations. 

50

FL3102 DFIR Flame Detector Manual - Simark Controls

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