152 HC900 Process & Safety Controller User and Installation Manual Revision 6
21 April 2017
Connecting the 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 HC900. For terminating HC900, do not install
resistor. Instead, set internal DIP switches for termination (page 42).
When using the HC900 XYR5000 transmitter function blocks and RS-485 serial communications ports,
connect Base Stations to the HC900 controller as shown in Figure 80.
Figure 80 - RS-485 Modbus slave wiring
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