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I am trying to implement communication between 8051 processor and Hitachi L200 VFD inverter. I am sending this message frame using RS485 communication:
01 06 00 01 01 00 D9 9A
but I am getting this response from the inverter:
01 D9 9A 51
It does not match with any of the exception response mentioned in Modbus implementation. I am using baud rate 4800, no parity and 1 stop bit and slave address is set to 1. I would appreciate if anyone could tell me what is going wrong.
01 06 00 01 01 00 D9 9A
but I am getting this response from the inverter:
01 D9 9A 51
It does not match with any of the exception response mentioned in Modbus implementation. I am using baud rate 4800, no parity and 1 stop bit and slave address is set to 1. I would appreciate if anyone could tell me what is going wrong.