164 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
For XYR 5000 base stations, if the RS-485 network is intermittent or fails completely over short
durations and recovers after the controller is power cycled, the need for additional port biasing may be
required.
Figure 94 shows recommended installation procedure for using an external isolator and additional port
bias.
Figure 94 - XYR 5000 RS-485 Modbus connections with isolator
RS-232 Modbus Connections
For Legacy controllers, connect to the RX, TX, and ground pins of the controller’s 3-pin RS-232 port.
(See page 38 for RS-232 DIP switch settings.)
Table 21 (page 143) identifies the pins. For connections on other devices, refer to its product manual.
For new 6.x controllers use an RS232-RS485 converter.
Use Designer software to Configure the legacy controller's RS232 port or New 6.x controllers RS485 port
as a Master of Slave. Use HC Designer software to configure the controller’s RS-232 port as a master or
slave.
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