What is the correct function code to use when reading and writing with an MBP Modbus Plus module?

The MBP Modbus Plus modules use the modicon quantum MSTR commands. MSTR 1 is used for a write command. MSTR2 is used for a read command. The modules support the 4XXXX range addressing with these commands.

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MVI46-MBP 3300-MBP 3350-MBP ProLinx MVI56-MBP