I believe it should be possible to use the RTU protocol, however it will take a significant re-work of the code that you are ref...
Answered 5 years ago
Modbus RS-232 ASCII serial communication with a Programmable Logic Controller (PLC)
6 years ago
Functions for communicating with Gilson GSIOC protocol devices over RS-232
4 years ago
Longitudinal Redundancy Check (LRC) for Modbus PLC Controllers using ASCII
8 years ago
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