When installing Modbus RTU hardware, you should be aware of the following.
Modbus RTU Controller Configuration
When configuring a controller for use with a CIMPLICITY project, do the following:
Configure the controller/communications card for Modbus RTU communications.
Assign each slave within the configuration a unique slave address between 1 and 247 (decimal).
Configure all slaves at the same baud rate and parity as the master (the Modbus RTU Communications enabler).
Connecting to a Series Six
To connect a personal computer to a Series Six with a CCM3 card installed, refer to the Series Six Programmable Controllers Data Communications Manual (GFK-25364).
Modbus RTU hardware configuration requirements.