CC220_Serial Communications

Serial Communications
RS-232C / V.24 Standards
The EIA RS-232C (common in U.S.) and the ITU V.24 standards (common in Europe) define
standards for serial data communications. The standards include mechanical, electrical, and
functional specifications. The RS-232C and V.24 standards are essentially equivalent.
EIA = Electronic Industries Association
ITU = International Telegraphic Union (formerly CCITT)
Mechanical Specifications
9-Pin D-Sub Connector
1 5
_______________
\ . . . . . /
\ . . . . /
-----------
6 9
View shown is the cable side of the port
Pin Number Description Abbrev. Direction*
1 Data carrier detect DCD In
2 Receive data RX In
3 Transmit data TX Out
4 Data terminal ready DTR Out
5 Signal ground GND
6 Data set ready DSR In
7 Request to send RTS Out
8 Clear to send CTS In
9 Ring Indicator RI In
* Signal direction assumes the PC or device is a DTE (Data Terminal Equipment) device.
25-Pin D-Sub Connector
1 13
_______________________________
\ . . . . . . . . . . . . . /
\ . . . . . . . . . . . . /
---------------------------
14 25
View shown is the cable side of the port
1

Pin Number Description Abbrev. Direction*
1 Protective ground
2 Transmit data TX Out
3 Receive data RX In
4 Request to send RTS Out
5 Clear to send CTS In
6 Data set ready DSR In
7 Signal ground GND
20 Data terminal ready DTR Out
22 Ring indicator RI In
* Signal direction assumes the PC or device is a DTE (Data Terminal Equipment) device.
Electrical Specifications:
Voltage State
-15V to -3V (typically -12V) Logic 1, “low”, or “mark”
+3V to +15V (typically +12V) Logic 0, “high”, or “space”
-3V to +3V Undefined
Communication Terms:
Baud rate
Start Bit
Data Bits
Stop Bits
Baud rate is a term that refers to the speed of data transmission. It is generally
expressed in bits per second (bps).
A start bit is a high signal on the transmit data line that informs the receiving end
to prepare to receive a character of data.
Bits used to encode data. Generally 7 or 8 data bits are common.
A stop bit is a low signal on the transmit data line that informs the receiving end
that transmission of data bits is complete.
Framing Bits The start bit and stop bit(s), together, are commonly referred to as framing bits.
Parity Bit
A parity bit is an optional bit added to the data bits to allow error detection.
Parity checking is a scheme used to make data transfer more secure (i.e. to reduce
the potential for errors during data transfer). Three settings for parity are
common. They are even, odd, and none. Even parity means that the number of
“low” bits in the data (including the parity bit, but not the framing bits) is always
even. Odd parity means that the number of “low” bits in the data (including the
parity bit, but not the framing bits) is always odd. No parity implies that no parity
bit will follow the data bits. Parity bits are automatically stripped from the data
stream.
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Serial Data Transfer
Example: The plus sign character, ‘+’ (bit sequence 0101011), is transmitted with 7 data bits,
even parity, and 1 stop bit, as follows
space +---+ +---+ +---+ +------+ high '0' +12V
| S | 1 1 | 0 | 1 | 0 | 1 | 0 P | Stop
mark ----------+ +-------+ +---+ +---+ +------- low '1' -12V
S = start bit P = parity bit Stop = stop bit(s)
Note: The order of transmission is LSB (least significant bit) to MSB (most significant bit).
ASCII Character Set
ASCII (American Standard Code for Information Interchange) is a code that sets a standard for
transmission of character data. The standard ASCII character set utilizes 7 data bits, to uniquely
encode each character. The Bosch control system uses the standard ASCII character set.
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Handshaking
Handshaking refers to the process by which devices coordinate the transfer of data. This
coordination is accomplished with the help of control signals (hardware) or control characters
(software). The control signals or control characters are used to stop and start the data transfer.
Why is it necessary to stop and start the data transfer?
Problems can arise, for example, if the transmitting device sends data faster than the receiving
device is able to process (normally store) this data. Without the ability to stop the transmitting
device, a temporary storage area, called a buffer, would overflow. Data might be lost.
Communication errors would occur. With handshaking, the receiving device has a chance to
stop the transmitting device, until it can safely process the data.
Two methods of handshaking are commonly used.
Hardware Handshaking
Control signals are used to start and stop the data transfer. Signals commonly used include,
CTS
RTS
DTR
DSR
Clear To Send
Request To Send
Data Terminal Ready
Data Set Ready
Note:
The Bosch control system uses DTR (pin 20) and DSR (pin 6) for hardware handshaking.
Most peripherals use CTS and RTS for hardware handshaking.
Software Handshaking
Control characters are used to start and stop the data transfer. Characters commonly used
include,
ASCII
Char (dec.) Name Description
17 DC1 Data Control 1 (commonly called XON)
19 DC3 Data Control 3 (commonly called XOFF)
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Serial Communications, Bosch Control System
Serial Interface Ports
CC220 Control System
Two serial communication ports, labeled X11 (V24.1/20mA) and X12 (V24.2), are located on
the CP/MEM board in the CC220 card rack.
Pin Configuration
Pin Configuration (Software Handshaking)
The following pin configurations are required in a serial communications cable when software
handshaking is used.
Bosch CC220
Port X11, X12*
Peripheral
TX
RX
GND
2 --------------- Data ------------------> RX
3 <-------------- Data -------------------- TX
7 ------------------------------------------ GND
*Ports X11 and X12 on the CP/MEM board are 25-pin D-Sub female connectors.
Note: Software handshaking is selected in the Bosch control when soft key SW CONTROL is
highlighted.
Pin Configuration (Hardware Handshaking)
The following pin configurations are required in a serial communications cable when hardware
handshaking is used.
Bosch CC220
Port X11, X12*
25-pin D-Sub
Peripheral
TX 2 --------------- Data ------------------> RX
RX 3 <-------------- Data -------------------- TX
DTR 20 ------------- Status ----------------> CTS**
DSR 6 <-------------- Status ----------------- RTS**
GND 7 ------------------------------------------ GND
* Ports X11 and X12 on the Bosch control are 25-pin female connectors.
** Some peripherals may use other pins for hardware handshaking.
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Note:
The status signals are not used at baud rates of 600 or less.
Hardware handshaking is selected in the Bosch control when soft key SW CONTROL is
not highlighted.
Communication Settings
Serial communication settings are contained in various locations in the Bosch control system.
The following table contains a list of settings and corresponding locations.
Serial Data Communication Setting
Setting Location
Baud rate Machine Parameter 5502
Data bits
Fixed, 7 data bits
Handshaking
Soft key SW CONTROL
Parity
Fixed, even
Port Selection
Soft key DEVICE SELECT
Start bits
Fixed, 1 start bit
Stop bits Machine Parameter 5503
Machine Parameters
Machine parameters for serial communications are in the range MP 5501 to MP 5507.
P 5501 Soft key text (for peripheral devices 1 to 4)
[1.] 2400 [2.] 2419 [3.] 2416 [4.] 2418
Parameter P 5501 specifies the text for peripheral devices. This text is displayed when
soft key DEVICE SELECT is pressed.
Text number
Text
173 Cassette 4800 Baud
174 Teletype 1200 Baud
178 Teletype 300 Baud
179 Teletype 110 Baud
2400 DCR 4800 Baud
2401 FER 204 1200 Baud
2402 GNT 4604 600 Baud
2403 MINI CASS 2400 Baud
2405 FCT 4030 1200 Baud
2406 FCT 4070 600 Baud
2407 LPR 300 300 Baud
2408 ZIP 30 300 Baud
2409 ZIP 585 300 Baud
2410 Device 1
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2411 Device 2
2412 Device 3
2413 Device 4
2414 Device 5
2415 CCDISK 4800 Baud
2416 CCDISK 9600 Baud
2417 XTRANS 4800 Baud
2418 XTRANS 9600 Baud
2419 DCR 9600 Baud
P 5502 Baud rate (periph. 1 – 4)
[1.] 4800 [2.] 9600 [3.] 9600 [4.] 9600
A transmission speed (baud rate) is assigned to each device.
Possible inputs:
110 baud
300 baud
600 baud
1200 baud
2400 baud
4800 baud
9600 baud
When selecting a speed, make sure it agrees with the text selected in P 5501.
P5503 Stop bits 1/1.5/2 (periph. 1 – 4) (1 / 1.5 / 2)
[1.] 1 [2.] 1.5 [3.] 2 [4.] 1
Specify the number of stop bits to be used with peripheral devices 1 to 4.
P 5504 Device Timeout (periph. 1 – 4) (Range of values: 0 – 127)
[1.] 15 [2.] 15 [3.] 15 [4.] 15
Specify the time (in seconds) for the peripheral device to respond after soft key START
is pressed during DATA IN and DATA OUT operations. If no response is received, or a
long interrupt is detected, run time error 149, “I/O UNIT TIMEOUT” is displayed.
P 5505
Space between files (periph. 1 – 4) (YES / NO)
[1.] YES [2.] YES [3.] YES [4.] YES
Specifying “YES” causes 110 NUL characters (ASCII character “zero”) to be output
during DATA OUT operations between successive files.
P 5506 Peripheral active on power up (range: 1 – 4)
[NC] 1 [NC2] 1
Specify a peripheral device number (range 1 – 4). The device is identified in P 5501.
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[NC] Serial data interface 1 (V.24 / 20mA)
[NC2]Serial data interface 2 (V.24)
P 5507 Serial data interface active at power up (NC / NC2)
[IN] NC [OUT] NC
Specify the serial data interface active at power up for DATA IN and DATA OUT
operations.
NC Serial data interface 1 (V.24/20 mA)
NC2 Serial data interface 2 (V.24)
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DATA IN / DATA OUT Functions
This section describes the DATA IN and DATA OUT functions of the Bosch CC220 control.
These functions are presented at several places in the Bosch user interface. The dialog for these
functions may vary depending on the context in which it appears. This section describes the
dialog presented in operating mode “Data I/O”
The DATA IN and DATA OUT functions are presented in operating mode “Data I/O”.
EDIT DATA IN GRAPHIC
MODE
DATA IN
The following soft keys are displayed:
DATA OUT
MANAGE
DEVICE
SELECT
*STATUS
PROGRAM
NUMBER
DFS PROGR
SEARCH
START
Press “DEVICE SELECT”. The following soft keys are displayed:
*PORT *GNT 4604
600 BAUD
*TTY
300 BAUD
*DCR
9600 BAUD
*DCR
4800 BAUD
Press “*PORT”. The following soft keys are displayed:
*V24.1
20 MA
*V24.2
*DNC-
CHANNEL
Press the soft key corresponding to the desired serial communications port.
Press the backup key. The following soft keys are displayed:
*PORT *GNT 4604
600 BAUD
*TTY
300 BAUD
*DCR
9600 BAUD
*DCR
4800 BAUD
Press the soft key corresponding to the desired peripheral device. The baud rate is also selected
with this soft key.
Press the backup key. The following soft keys are displayed:
DEVICE
SELECT
*STATUS
PROGRAM
NUMBER
DFS PROGR
SEARCH
START
Press the soft key “*STATUS”. The following soft keys are displayed:
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*SW
CONTROL
Select the type of handshaking with soft key “*SW CONTROL”.
SW CONTROL highlighted indicates software handshaking active.
SW CONTROL not highlighted indicates hardware handshaking active.
Press the backup key. The following soft keys are displayed:
DEVICE
SELECT
*STATUS
PROGRAM
NUMBER
DFS PROGR
SEARCH
START
If the data to be loaded consists of a complete program, including a program identification block
(DFS block), press soft key “START”.
If the data to be loaded consists of a single program with no part program identification block
(DFS block), press soft key “PROGRAM NUMBER”. Enter a program number at the prompt.
Then press soft key “START”.
If the data to be loaded consists of multiple programs, of which, only one is to be stored, press
soft key “DFS PROGR SEARCH”. Enter a program number at the prompt. Then press soft key
“START”.
The program is read in. The data transfer may be stopped at any time by pressing soft key
“ABORT”.
When the data transfer is complete, the following soft keys appear.
DEVICE
SELECT
*STATUS PROGRAM
NUMBER
DFS PROGR
SEARCH
START
DATA OUT
The following soft keys are displayed:
DEVICE
SELECT
*STATUS
PART
PROGRAM
SEVERAL
FILES
Press “DEVICE SELECT”. The following soft keys are displayed:
*PORT *GNT 4604
600 BAUD
*TTY
300 BAUD
*DCR
9600 BAUD
*DCR
4800 BAUD
Press “*PORT”. The following soft keys are displayed:
*V24.1
20 MA
*V24.2
*DNC-
CHANNEL
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Press the soft key corresponding to the desired serial communications port.
Press the backup key. The following soft keys are displayed:
*PORT *GNT 4604
600 BAUD
*TTY
300 BAUD
*DCR
9600 BAUD
*DCR
4800 BAUD
Press the soft key corresponding to the desired peripheral device. The baud rate is also selected
with this soft key.
Press the backup key. The following soft keys are displayed:
DEVICE
SELECT
*STATUS
PROGRAM
NUMBER
DFS PROGR
SEARCH
START
Press the soft key “*STATUS”. The following soft keys are displayed:
*SW
CONTROL
*DFS
RECOGNIZE
*WITH
LEADER
*WITH
TRAILER
Select the type of handshaking with soft key “*SW CONTROL”.
SW CONTROL indicates software handshaking active.
SW CONTROL not highlighted indicates hardware handshaking active.
If a program identification block (DFS block) is to be output with the data (highly
recommended), highlight the soft key “DFS RECOGNIZE”.
It is not normally necessary to highlight the soft keys, “*WITH LEADER” and “*WITH
TRAILER”. These keys cause leading and trailing NUL characters to the beginning and end of
program data.
Press the backup key. The following soft keys are displayed:
DEVICE
SELECT
*STATUS
PART
PROGRAM
SEVERAL
FILES
To output a single program, press soft key “PART PROGRAM”. Enter the program number
when prompted.
To output several programs, press soft key “SEVERAL FILES”. The following soft keys are
displayed:
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PART
PROGRAM
MAIN AND
SUBPROGRAM
ALL
PROGRAMS
OTHER
FILES
Use these soft keys to build a list of programs to be output.
After the program number has been entered (soft key “PART PROGRAM”) or the list of
programs has been built (soft key “SEVERAL FILES”), press soft key “START”.
The selected data is output to the selected serial communications port. If hardware handshaking
is active, data is sent only after input signal, Data Set Ready (pin #6), goes high. If software
handshaking is active, data is sent immediately.
12

DNC Program
DNC.DOC-DOCUMENT FILE FOR DNC.EXE
TRUMPF DNC PROGRAM DNC.EXE REVISION 6-7-94
The TRUMPF DNC program is a program that may be used to send and
receive programs from an IBM compatible PC and a Bosch control.
The program supports 9600,4800 and 600 baud and software or
hardware handshaking through COM1 or COM2.
Pin Connections
Typical configuration:
Bosch
PC
25 PIN MALE 9 PIN FEMALE
2 ----------------- 2
3 ----------------- 3
6 ----------------- 4
20 ----------------- 6
7 ----------------- 5
Loading the program
Copy the file DNC.EXE from the floppy disk onto your hard drive.
The file should go into a directory specified in your PATH. If
in doubt, copy the file into the root directory. (Example COPY
A:DNC.EXE \ )
Setting up the Bosch control
DEVICE SELECT - 9600,4800, OR 600 BAUD
PORT - V24.1 or ON PANEL (depending upon software level)
STATUS - SW CONROL not highlighted (hardware handshake is
desired)
Using the program to transfer programs
Place yourself in the proper directory.
Call up the program by typing DNC.
The current PC port and baud rate are displayed above the
command line.
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The commands are
C - Change communication settings
This brings up choices for Comm port 1 or 2, and baud rate
600,4800,9600.
The next selection is software or hardware handshake. The
desired selection is hardware, if sw control was not
highlighted.
These changes can then be saved to disk so the next time that
DNC is called up, the settings are recalled when DNC is run from
this directory.
D- Change directory
This will allow the user to change the current directory for
file transfer
S - Send file
This will display a choice to press K to key in the name, or L
to select the files from a list. If L is pressed, move the
cursor to the desired file to send, and press enter, or press K
to key in the name. After file has been selected, press --DATA
IN--START-- on the Bosch control to start transmission. When
hardware handshaking is active, this must be done within 20
seconds.
R - Receive file
This will ask for filename to receive, then opens that file on
the PC. To send the file to the PC, press --DATA OUT-- enter
program(s) to send --START-- . When all programs are finished
being sent, press any key to return to the main menu.
Q – Quit
This will quit the program, and go back to DOS.
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Diagnostics
Several tools are available to aid in solving data communication problems.
The Bosch control system includes a diagnosic program, D6 – SERIAL INTERFACE DATA.
This program can be used to display data input to the Bosch control system. Refer to a manual
from Bosch titled “Typ1 osa / CC220 Diagnosis, Operation, Applikation” (Bosch Part Nr.
4228/E1 – 10/91), for more information on this diagnostic program.
A breakout box is a useful tool for diagnosing serial interface problems. A breakout box can be
used to examine individual signal status and switch signal lines.
15

Bosch Data Format
Input Data
For data input to the Bosch control system, the following format is generally recommended,
<LF>
(DFS, … )<LF> Program identification
… <LF>
Program block
… <LF>
Program block
… <LF>
Program block
… <LF>
Program block
M02<LF>
End of program
Notes:
All characters prior to the first line feed character, <LF>, are stripped from the data
stream.
The end of program code, “M30”, may be used in place of “M02”.
A line feed character, <LF>, must follow the end of program code, “M02” or “M30”.
An optional carriage return character, can preceed a line feed character in the input data.
The program identification block is optional, but must be used if the soft key
“PROGRAM” is not pressed during the “DATA IN” dialogue.
Certain control characters, if present in the data stream, are filtered (i.e. stripped) by the
Bosch control on input. These characters include the following,
ASCII
Char(dec.) Name Description
2 STX Start of text
3 ETX End of text
18 DC2 Data control 2, Device ON
20 DC4 Data control 4, Device OFF
Output Data
The output data format varies depending on the type of handshaking used.
Output Data Format with Hardware Handshaking
Hardware handshaking is specified when soft key “SW CONTROL” is not highlighted.
Data is output with the following format when hardware handshaking is used.
<STX><LF>
(DFS, …)<LF>
Program identification
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… <LF>
… <LF>
… <LF>
… <LF>
M02<LF>
<ETX>
Program block
Program block
Program block
Program block
End of program
Note:
The program identification block is only output if soft key “DFS RECOGNIZE” is
highlighted.
Output Data Format with Software Handshaking
Software handshaking is specified when soft key “SW CONTROL” is highlighted.
Data is output with the following format when software handshaking is used.
<DC2><STX><LF>
(DFS, …)<LF>
… <LF>
… <LF>
… <DC4><DC2>… <LF>
… <LF>
M02<LF>
<ETX><DC4>
Program identification
Program block
Program block
Program block
Program block
End of program
Note:
The control characters, <DC2> and <DC4>, are device control characters that appear in
the data stream on output. They are NOT part of the data, and can be filtered (i.e.
stripped) from the data stream. Some serial communication programs provide a setting to
perform this function. The “Replace” function on many text editors can also be used to
remove these characters. It is not necessary to filter these control characters, however,
since the Bosch control system automatically filters these characters from the data stream
on input.
The program identification block is only output if soft key “DFS RECOGNIZE” is
highlighted.
17