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Appendix A: Camera control protocol
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Appendix A: Camera control protocol
The SDC 8200 conference and interpretation system supports camera con-
trol. The central unit sends a control command to the connected camera
control:
y when a delegate or chairman unit is activated,
y when a delegate or chairman unit is deactivated,
y when all active microphones are deactived one after the other,
y when all active microphones are deactived simultaneously
(priority function),
y every 5 seconds for synchronization.
These commands are evaluated by the camera control which then auto-
matically aims the camera at a speaker and adjusts the focus.
The camera control must be connected to the SDC 8200 CU central unit’s
COM 2 interface (RS 232 connection). The settings for the communications
port for camera control are:
Bits per second: 19,200
Data bits: 8
Parity: None
Stop bits: 1
Flow control: None
The syntax of the commands
All commands sent by the SDC 8200 CU central unit start with a “%” sign.
The last character is a character which states the end of the transmission.
Just before the end-of-transmission character, there are four characters
within the command sent to the camera control which account for the CRC
checksum.
The CRC checksum is in uppercase hexadecimal form while all other num-
bers are in decimal form.
STX “%” data CRC ETX
Start of Transmis-
sion Character
(0x25 = “%”)
Data of the com-
mand
16 bit sum of the
ASCII characters
between STX and
CRC
End of Transmis-
sion Character
(0x0D)