ModBus RTU

Hello All!

I am trying to find out, how do I change or modify a ModBus Register.
I want to create a button and this button should change a designated register which is responsible to switch ON/OFF a relay.
I am already manage to read a register, thanks to the example on the blog.
But I do not know how to change the values.
Thanks for the help and hints in advance.

Eddy

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