Barco BarcoGraphics Maxwell/ 6300, User Manual

Page: 17 / 513

17
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Communication protocol summary
Start byte
\xfe
Projector address
Command byte(s)
Data bytes
(OPTIONAL)
Checksum byte
Stop byte
\xff
n
Start byte
The "start byte" informs the projector (in case of
transmission) or the computer (in case of reception) that a
new data transfer will take place.
n
Projector address :
The "projector address" defines the address of the
projector the computer wants to talk to (in case of
transmission) or the address of the projector that answers
(in case of reception).
The maximum number of projectors that can be addressed
by one computer is 256.
n
Command byte(s) :
There is at least one command byte to define the action to
be performed. Commands that are not often used or
complex commands can take more than one byte.
All command bytes that are sent by the computer to get
information out of the projector are repeated in the answer-
data-transfer of the projector.
n
Data bytes
(OPTIONAL)
:
Wheather the command bytes are followed by one or more
data bytes depends on the contents of the command bytes.
(Some commands are not followed by data bytes at all !)