When onsite, a RS422 data loop was not working. The site had been undergoing renovations and some stations had been removed.

NOTE: This method cannot be used if there are RS422 only (IN2000-XX) stations remaining on the dataloop.

Fault:

The 2100-IS converter had its RX LED on all the time. All stations on the dataloop where turned off, and a voltage of approx 24v remained on the RX wires 72 & 73.

Solution:

Remove wires 72,73 from all stations and converter and convert dataloop to RS485.

Stations:

a) Remove wires from terminals 72,73.
b) link H2 comms for RS485

Converter:

a) Remove wires from terminals 72,73.
b) change S2 switches 1,2,3,4 & 7 ON.

NOTE: S2 7 is ON for RTU mode in case any of the stations have TXE delay set to zero.

Note:

This is only possible with 2100-XX stations.
It has been tested only on 2100-A16 stations, both rev 1.2 and Rev 0.