bel Digital Audio BMA2-4SHD, User Manual, Page: 27 / 37

BEL DIGITAL AUDIO BMA2-4SHD BM-A series serial protocol
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2006 BEL (Digital Audio) Ltd 23 Version 0.8
Data count:
This is the total number of data bytes following, up to a maximum of 127.
Data:
The data required for the command is carried here. Each character can have a value of 0X00
to 0X7F i.e. 7 bits.
Checksum:
This is the modulo sum of the characters in the frame between the destination address and
the last data character inclusively. It is calculated thus:
DO
{
checksum = (chchecksum) AND 0x7F
}
FOR ALL CHARACTERS IN FRAME.
End Flag:
A character 0XFE ends the frame.