Please refer to the Catalyst Operator’s Manual section 2.5 – Catalyst RTU Interior View Diagram. Find the location of the jumper field P10. Shown below is the configuration of jumper shunts for both RS-232C and RS-485/422. Each rectangle around two numbered pins represents a jumper shunt.
RS-232 Configuration (Default) |
RS-485 or RS-422 Configuration |
If the Catalyst is NOT at either endpoint of the RS-485/RS-422 network then the termination resistor jumper (Pins 17 &18) should be set as shown below:
RS-485/RS4-422 Configuration w/o Termination Resistor