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poll values using Modbus TCP master


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I'm trying to poll some values from Laumas weight transmitter - and I'm kind of stuck.  I've tried to read some addresses according to the Laumas manual, but the power-up value in the receiving variable is never overwritten.   I get modbus status as -11, which I don't know what means.

THe  setup:


It should be reading all the time if set up as periodic and the active bit is set ?

The values when running:



Anybody with any hints for me?
Thanks, Bjarni

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