Rs485 Modbus Protocol

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Hi Friends
I am new to rs485 communication i want to know how to create rs485 modbus protocol using given register value for accessing information that is read data and write data i have baud rate is 115200 data is 7, parity even stop bit is 1 and register address is
for reading data register address is D174
for write data register address is M605 and M72
slave id is 3A

Please guide me to create Rs485 Modbus protocol using the above register value

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