Calculating CRC for Modbus RTU

[tekart]

Also,

If I enter [0F 03 00 00 00 04] as sent from the host above, it shows 0x2745 for the CRC, which is the same thing the host sent.

So that has to be the right algorithm.
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Hey Darrel,
You gave me the final clue - it was a byte order issue I needed to reply with the bytes reversed: D2 0F. Your result above clued me in!

Thanks much - see screen shot showing no errors.

Guy