CRC

There are many CRC codes available online that can be found.
However, there are instances where they cannot be used or encounter compatibility issues with the hardware.
Here, I'm providing my version for serial communication, specifically MODBUS with 485 physical links.
A simple use case as follows:

def main():
  CRC(0x01, 0x05, 0x00, 0x01, 0xFF, 0x00) # these 6 hex number is your protocal command