User`s manual

NexSens Technology, Inc.
iSIC User‟s Manual 31
2 Sensor Interface
2.1 RS232
In addition to the single RS232 port located externally on the iSIC via the MS8 connector, three
RS232 ports are available on the internal Digital terminal strip. Ports 1, 2, and 3 are available
for use. To connect your RS232 sensor to the iSIC, open the enclosure, unscrew the correct pins
on the terminal strip, and attach the wires from your sensors cable to the connector. A diagram
showing the proper wiring for Port 1 is shown below:
Simply connect the Rx pin of the sensor to the Tx pin on the iSIC and the Tx pin of the sensor to
the Rx pin on the iSIC.
RS232 Ports 2 and 3 can be accessed through the same terminal strip. Port 2 uses pins 7
through 9, Port 3 uses pins 10 through 12. RS232 Sensors requiring a 12V power supply to
operate should connect the wire for power to pin 3, BAT, on the terminal strip.
The RS232 sensor should support standard protocols such as Modbus RTU, NMEA0183 or ASCII.