Modbus Read/Write questions.

[Giamba]

Hi,
In the modbus client, the client can read or write but I can't find which one happen first ? read or write?
Then, Is it possible to read and write on the same register and how to.
I wan to write register, transform my variable with a C program and read it into mervis.

Thanks in advance.

[tomas_hora]

@Giamba The order of sending the commands is not defined. Modbus defines input (readonly) and holding(readwirte) registers for this purposes. So you should use two registers, one for writing from Mervis to your application, and read the result of the computation of your application from a different register.