In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

May  I suggest that you stay with the 8N1 serial format while you initially develop the program in SX/B and consider adding other USART options after resolving all the Modbus code??  You can easily allow VB to temporarily support it.

I suspect getting started in SX/B would make this all evolve more quickly.  Later, someone can help you set up more serial protocols and parity after you have proved to yourself that the Modbus slave program is working properly.  After all, if you don't know how to program in assembly, you might get stuck  with the USART and not finish the project.

Why start with a small, but complex detail when you hve a lot to learn?

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