Sennheiser CONFERENCE SYSTEM SDC 8000 User Manual download pdf (Page 110)

Appendix A: Camera control protocol

110

Appendix A: Camera control protocol

The SDC 8000 conference and interpretation system supports camera

control. 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

automatically aims the camera at a speaker and adjusts the focus.

The camera control must be connected to the SDC 8000 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

Note!

In order to activate camera control on the central unit, you have to

purchase the serial output license SDC 8000 S-SO (Cat. No. 9855)

The syntax of the 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)

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 116

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