Writing to a Holding Register Using Modbus Poll Master Software.

I want to send 1999 to a temperature indicator that accepts serial values into 40031 register. How can I write into a holding register using Modbus poll master software?

I am using serial communication using RS-485. I am new to this topic, and I am an intern. Anyone willing to help me on this please ping me on [email protected].

Thanks in advance,

There are so many settings that can cause Modbus RTU to not work. It pays to read a value from a slave before writing a value to a slave.

Can you successfully read the value in (4)0031?