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Hi i am new to modbus RS485 i am unable to find the type of crc for the given polling query.I am having the following modbus protocol.

01 37 37 1D 30 30 33 1D 30 03 34 37 33 39 37 04
01 37 37 1D 31 31 31 1D 30 1D 1B 5B 43 03 36 34 38 32 38 04 
01 37 37 1D 30 31 30 1D 30 1D 03 35 34 34 30 30 04

for the above modbus polling query i am unable to find the correct crc method and calculation.Please guide me to do correct way of crc calculation method.

Sathish
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