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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..
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..
Chapter 1: Communications basics
Chapter 1: Communications basics
communication protocol communication protocol