Selecting RS232C or RS-485/RS-422

 

Please refer to the Catalyst Operators 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