Configuring an M1 CPU with Modsoft
870 USE 101 10 V.2 241
Changing the Protocol on Modbus Port 2 Overview If your Momentum M1 CPU is using the Modbus Port 2 provided by the 172 JNN
210 32 Option Adapter, you can specify whether it will use the RS232 or RS485
protocol. The factory-set default for Modbus Port 2 is RS232.
If you are using the Modbus Port 2 provided on the 171 CCS 780 00 or
171 CCC 780 10 Processor Adapter, the port is hardwired as a dedicated RS485
protocol. However, you must change the default setting on the Port editor screen
from RS232 to RS485, or the port will not function.
Procedure From the Port editor screen, perform the steps in the following table to change the
Protocol on Modbus Port 2.
Step Action
1Place the cursor on the current Protocol entry for Modbus port 2. Push <Enter>.
Result: A popup window appears in the top left corner of the screen displaying the
two protocol options:
2Use an arrow key to toggle the cursor onto the desired protocol selection in the
popup window, then push <Enter>.
Result: The Port editor screen is updated with the protocol you have specified.