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It is not possible to write only once with piModbusMaster.
For this, you can directly access the libmodbus API from another application on startup for making needed initialization and thereafter start piModbusMaster service.
I want to change parameters of the Modbus Master communication, but I can't find them in PiCtory. For example Timeout or Inter-Frame Spacing Timer. What can I do?
These parameters are included in the "libmodbus" library. You are welcome to modify them yourself.
https://revolution.kunbus.de/forum/viewtopic.php?f=6&t=2023&hilit=modbus+timeout&start=20
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