H-4191 Brochure - WaterLOG

Model H-4191
RS-232 to SDI-12 Interface
The WaterLOG ® Model H-4191
allows the user to interface to
a laptop computer in order
to configure and test SDI-12
sensors as well as monitor the
communication between a data
logger and its sensors.
The H-4191 allows a PLC, RTU
or other host device with a RS-
232 port to access SDI-12
sensors.
KEY FEATURES
• Provides both the electrical and protocol functions for interfacing a RS-232 host
device to one or more SDI-12 sensors
• Works with any sensor command & response message including vendor specific
extended commands
• Buffers the command so no special timing is required, even hand-typed
commands will work
• Generates proper parity for the SDI-12 bus
• Automatically sends SDI-12 breaks & retries
• Passes the sensor service request to the host
• Supports optional CTS/RTS hardware flow control for a slow host device
• Low power mode facilitates use with a RS-232 data radio
• LED shows when the H-4191 is awake
• Built in “sensor” can measure the SDI-12 bus battery voltage
Design Analysis Associates Inc. • 75 West 100 South Logan, Utah 84321 USA • Tel: (435) 753-2212 • Fax: (435) 753-7669 • sales@waterlog.com • www.waterlog.com

Specifications
data input
Internal
Voltage
Monitor
(Address “Z”)
Data Output
Range 6-18V
Resolution
Accuracy ±1%
8-bit (.08V)
RS-232 Port Type Asynchronous, 9600 baud
(fixed), 8-bit, no parity
Flow Control
Command Buffer
SDI-12 Port Baud Rate 1200
Protocol
Output Voltage Levels
RTS/CTS (optional)
60 characters
SDI-12, 7-bit even parity,
1 stop bit
Minimum
high level:
Maximum
low level:
3.5 volts
0.8 volts
Mechanical Data
Physical Material ABS plastic
Size
3.75" Long x 2.65" Wide x 1.25" Deep
Connectors RS-232 9-Pin, female,
D-sub, DCE
(modem)
connections
SDI-12
Power Input Voltage 9 to 16.0 Volts DC
Environment
4-position terminal
strip, pluggable,
Phoenix
Combicon
Supply Current Sleep Mode 100 μ A typ
Surge
Protection
Active
Built in, 1.5 KVA
Temperature Operating -40° C to +50° C
Miscellaneous
Warranty
Note
Storage
-50° C to +70° C
20mA typ
The WaterLOG® H-4191 is warranted against defects in
materials and workmanship for one year from date of
shipment.
Specifications subject to change without prior notice
due to ongoing commitment to product testing and
improvement. LR February 15, 2011. D37 0211.
Design Analysis Associates Inc. • 75 West 100 South Logan, Utah 84321 USA • Tel: (435) 753-2212 • Fax: (435) 753-7669 • sales@waterlog.com • www.waterlog.com