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6 Remote Communications
6.1 RS232/ 485
6.1.3 Jumpers
In addition to wiring, jumpers on JP1 and JP2 must be properly positioned. For RS-232, both jumpers
must be set to B and C as shown in the picture above. They must be placed on A and B for RS-485.
6.1.4 Configuration Parameters
ERX350 items in the 'Communications' group in MasterLink may need to be modified to accommodate a
particular external device.
Items 170 and 172 are primarily associated with the behavior of MI Protocol. These should normally left
as default (shown here). The remainder will vary depending on the external devices. See also Modbus
section below for settings relevant to the Modbus protocol.
Honeywell
132
2023
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