Panasonic FP2 ET-LAN Technical Manual page 232

BCC (Block Check Code)
The BCC is a code that carries out an error check using horizontal parity, to improve the reliability of the
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data being sent.
The BCC uses an exclusive OR from the header (%) to the final character of the text, and converts the
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8-bit data into a 2-character ASCII code.
Example
14-4