Communications Installation - Connecting the HC900 Controller to Modbus device(s)
144 HC900 Process Controller Installation and User Guide Revision 19
06/14
Figure 78 shows recommended installation procedure for using an external isolator and additional port bias.
Figure 78 - XYR 5000 RS-485 Modbus connections with isolator
RS-232 Modbus Connections
Connect to the RX, TX, and ground pins of the controller’s 3-pin RS-232 port. (See page 36 for RS-232
DIP switch settings.)
Table 19 (page 124) identifies the pins. For connections on other device, refer to its product manual.
For multiple devices on RS-232, use an approved RS-232-to-RS-485 converter.
Use HC Designer software to configure the controller’s RS-232 port as a master or slave.
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