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In this message the CRC-value is 74 b8 00 00 that is in reverse order 47220 (0xb874), and the array is , how will that happen?
I downloaded the crc code to carlculate CRC16-CCITT and CRC32-CCITT but none of them works for calculating the AMBrc messages.
So calculating a checksum may be a simple method for detecting errors, but doesn't give much more protection than the parity bit, independent of the length of the checksum.
The idea behind a check value calculation is simple.
The message appears twice that is 13 bytes followed by another 13 bytes message in the same TCP/IP package.
I strongly believe that the array bytes13b (or maybe bytes13e) is the right one to calculate the CRC-value for.
Let us assume that in our example array the lowest significant bit of the character 'L' is set, and the lowest significant bit of charcter 'a' is lost during communication.