Sennheiser CONFERENCE SYSTEM SDC 8000 - Manual (Page 112)

Appendix B: Control panel protocol
112
Appendix B: Control panel protocol
The SDC 8000 conference and interpretation system supports a control
panel. The central unit sends a control command to the connected control
panel:
y when a delegate or chairman unit is activated,
y when a delegate or chairman unit is deactivated,
y a microphone goes into request mode,
y when all active microphones are deactived simultaneously
(priority function).
The control panel sends a control command to the central unit:
y when a delegate or chairman unit is to be activated,
y when a delegate or chairman unit is to be deactivated,
y when the control panel is to be reset (Reset)
The control panel must be connected to the SDC 8000 CU central unit’s
COM 2 interface (RS 232 connection). The settings for the communications
port for the control panel are:
Bits per second: 19,200
Data bits: 8
Parity: None
Stop bits: 1
Flow control: None
Note!
In order to connect a control panel to the central unit, you have to
purchase the serial output license SDC 8000 S-SO (Cat. No. 9855)
Commands
All commands sent by the SDC 8000 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
numbers are in decimal form.
STX “%” data CRC ETX
Start of
Transmission
Character
(0x25 = “%”) Data of the
command 16 bit sum of the
ASCII characters
between STX and
CRC End of
Transmission
Character
(0x0D)