Connecting The Controledge Hc900 Controller To Modbus Device(S) - Honeywell 900U02-0100 User And Installation Manual

7.5. Connecting the ControlEdge HC900 Controller to Modbus
device(s)
RS-485 Modbus connections
Use Designer software to configure the controller's galvanically isolated RS-485 port as a master or slave.
Install resistor as shown for terminated devices except ControlEdge HC900. For terminating ControlEdge
HC900, do not install resistor. Instead, set internal DIP switches for termination (page 38).
When using the ControlEdge HC900 XYR5000 transmitter function blocks and RS-485 serial
communications ports, connect Base Stations to the ControlEdge HC900 controller, shown in Figure 92.
Figure 92 - RS-485 Modbus slave wiring
162 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019