Appendix B: Control panel protocol

Appendix B: Control panel protocol

The SDC 8200 conference and interpretation system supports a control panel. The central unit sends a control command to the connected control panel:

ywhen a delegate or chairman unit is activated,

ywhen a delegate or chairman unit is deactivated,

ywhen a microphone goes into request mode,

ywhen all active microphones are deactived simultaneously (priority function).

The control panel sends a control command to the central unit:

ywhen a delegate or chairman unit is to be activated,

ywhen a delegate or chairman unit is to be deactivated,

ywhen the control panel is to be reset (Reset).

The control panel must be connected to the 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

Commands

All commands sent by the central unit start with a “%” sign. The last char- acter 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.

STX “%”

data

CRC

ETX

Start of Transmis-

Data of the com-

16 bit sum of the

End of Transmis-

sion Character

mand

ASCII characters

sion Character

(0x25 = “%”)

 

between STX and

(0x0D)

 

 

CRC

 

The CRC checksum is in uppercase hexadecimal form while all other num- bers are in decimal form.

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Sennheiser SDC 8200 system manual Appendix B Control panel protocol, 122