Function Code 8 library in C

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Engin Esiyok

Trying to communicate ABB AC450 master RTU with ABB AC31 slave RTU. Master sends function code 8 but AC31 does not respond. They have recommended to use a KD485 MODBUS RTU slave programmable to function code 8 in C. Anybody has a function code library in C? Or any other recommendation?
 
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