Barco R5975236 User Manual download pdf (Page 16)

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BARCO Serial Communications User Manual 16

communication protocol

 Checksum byte :

The "checksum byte" is used to detect errors during

transmission or reception.

Formula :

Checksum byte

= (Projector address + Command bytes + Data bytes) modulo 256

 Stop byte :

The "stop byte" informs the projector (in case of

transmission) or the computer (in case of reception) that

the data transfer is complete and that the interpretation of

the command and data bytes can start.

Any command byte, data byte or checksum byte

that equals \x80, \xfe or \xff has to be converted !

Transmission :

- Instead of \x80, send \x80 followed by \x00.

- Instead of \xfe, send \x80 followed by \x7e.

- Instead of \xff, send \x80 followed by \x7f.

Reception :

- Replace \x80 followed by \x00 with \x80.

- Replace \x80 followed by \x7e with \xfe.

- Replace \x80 followed by \x7f with \xff..

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Barco R5975236 User Manual Page 16

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