Mapping two Modbus RTU devices to SCADA via Modbus TCP

ProcessControl · January 16, 2026, 7:49pm

HMI Model: cMT-SVR-100
EasyBuilder Pro Version:

Similar to one of my previous application questions dated May 2025. This time I will be Reading / Writing “two” Modbus RTU (2 wire RS485) devices and again communicating with SCADA Modbus TCP/IP. SCADA will be setup as a Modbus Server (as before) using Address Mapping Tables. Now that I have two devices can I still utilize address mapping to SCADA? I know that in the MODBUS RTU Device Settings I can select the station number, but how do I differentiate this information SCADA Server Device? Thanks for your support!

Aaron.S · January 16, 2026, 11:41pm

Hi @ProcessControl ,

Yes, this should be possible. You can have a single Modbus RTU master communicate with multiple stations and map the data using the Address Mapping Table. For each mapped address, you will need to specify both the station number and the device address. The syntax would be 0x 2#1, where “2” represents station 2 and “1” represents the 0x address offset of 1.

Please let us know if you have any other questions.

Thank you!