Conspec Controls CN Series Operation & Maintenance Manual - Page 6
Browse online or download pdf Operation & Maintenance Manual for Transmitter Conspec Controls CN Series. Conspec Controls CN Series 18 pages. Universal transmitter
Print Page4.0 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)
Data Line Connections:
CONNECTOR
J1-1
J1-2
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.
(800) 487-8450; Fax: (724) 489-9772
6 Guttman Boulevard, Charleroi Industrial Park, Charleroi Pennsylvania 15022
900745 2W ModBus 485 Communications Board
EIA/TIA 485 NAME
B -
A +
Page 6 of 17
DESCRIPTION
Transceiver Terminal 1
Transceiver Terminal 2
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