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© 2021 All rights reserved. Data subject to change without notice.
RDM - Operation Manual
Rev. B | 2021.12
External power to the RDM must be supplied by a 24 VDC power supply or a
Class 2 (or better) transformer and connected to the Modbus® wiring terminal.
The wiring should be 4-conductor shielded 16 awg stranded within conduit in a
network wiring (daisy-chain) configuration.
Common wire colours for positive, negative and digital wires are:
• Red for positive
• Black for negative
• White for Data A
• Green for Data B
All wiring should be run within properly grounded (earth or safety) conduit.
Signal output and supply should be in shielded cable. The cable shield should
be connected to earth ground at the controller/power supply that is providing
power for the RDM.
NOTE: WARRANTY VOID IF SOLID-CORE WIRE IS USED AT THE WIRING
TERMINAL STRIP.
When using solid core wiring for distribution (in the conduit),
use stranded wire pigtails 18 AWG within the enclosure to connect to the
circuit board. The rigidity of solid-core wire can pull a soldered terminal strip
completely off a circuit board and this will not be covered under
warranty.
5.6 Wiring the RDM to the FCS
The RDM can be connected to the FCS using the Modbus® LAN terminal
connection.
The read and write default RDM Modbus® ID is 230. The RDM will
automatically broadcast the display information to Modbus® ID 253. This is
the common Modbus® ID for all RDMs on the network and is used to listen for
broadcasts from the controller and receive screen updates from the controller.