Modbus; Figure 7 Common Relay Wiring; Rs-485 Modbus - RC Systems ViewSmart 1600+ Operation Manual

(-)
Alarm
Device
3.3.2 RS-485 Modbus®
Recommended cabling for RS-485 communications is 24-18AWG shielded twisted pair. Multiple devices
may be connected on a single RS-485 loop using unique remote IDs. When connecting devices in series,
be sure that terminating resistors are removed from all but the final device on the communication loop.
Power for connected RS-485 may be drawn from TB4 terminals 2, 4, 6 & 8 of the standard I/O Board.
These terminals provide a maximum of 500mA fused output power for powering of auxiliary external
UM-1097
Revision B
(+)
Power for
the Alarm
Device

Figure 7 Common Relay Wiring

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