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4.0 MODBUS OVERVIEW
The Conspec 900745 communication board allows interconnection of a Universal Remote Sensor or
Combustible Remote Sensor to a standard 2-wire, RS-485, ModBus communication system. The UT
communicates ModBus RS485 via 2 wire, twisted-pair connection (18-22 AWG shielded)
900745 2W ModBus 485 Communications Board
Data Line Connections:
Status LEDs:
D1…...…….Power (Green). Turns ON steady following a proper power initialization cycle.
D2…………Communication Fault (Red). Flashes once during power initialization cycle. Flashes again
each time a communication error occurs with the Universal Remote Sensor microprocessor.
D3…………Data Receive Indicator RX (Yellow). Illuminates when data is present on RS-485
communication bus, indicating the Master or another Slave is talking.
D4…………Data Transmit Indicator TX (Yellow). Illuminates when a response is being sent from this
Slave to the Master.
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