6 Guttman Boulevard, Charleroi Industrial Park, Charleroi Pennsylvania 15022
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4.5 Optional Modbus / Relay Card
The Conspec 900773-24 (24V version, 900773-12 (12V) custom order) ModBus Relay Card (optional) is a
communication board with three relay outputs (1
st
Alarm, 2
nd
Alarm, Sensor Fail) in addition to allowing
interconnection 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)
ModBus / Relay Card Status LEDs
Status LEDs are visible on the ModBus Relay Board and are for troubleshooting purposes. They are as
follows: Power, Fault, RX, and TX. Power indicates unit is operational and has supply power going to it. Fault
indicates some type of communications or ModBus card fault. The RX and TX are ModBus communication
indicators will flash in accordance with communication received or sent.
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