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Danish Interpretation Systems Technical Specifications
Printed in Denmark
13
• The MICROPHONE_CONTROL_GRP with messages regarding switching microphone on/off,
controlling the request queue etc. The value corresponding to
MICROPHONE_CONTROL_GRP is 18.
• The VOTING_CONTROL_GRP with messages to start and stop attendance check and voting
sessions, and to request voting results. The value corresponding to VOTING_CONTROL_GRP
is 52.
The following sections describe the messages from each message group.
4.3.1 Messages in EXTERNAL_CONTROL_GRP
The following subsections describe each of the messages in the group. The message format
descriptions have the same meaning as in section 3.4.3.
EXTERNAL_NEW_UNIT
Command item value: 1
Message format:
<START> ‘j’ <ID> <0> <15> <173> <27> <1> <Capabilities> <External Identity> <CRC> <STOP>
This message is used by an external control unit to register to the CU. The result of registration in the
CU is an address assigned to external control unit for unique identification. This message should be
sent with the group address for external controllers (4013) as sender address.
When registering in the CU, the external control unit indicates, which functionality the external
controller is capable of running. This is indicated by the parameter Capabilities:
Capabilities Value
Description
Only Microphone
Functionality
2 The external controller supports only microphone
functionality.
Microphone and
Voting Functionality
10 The external controller supports microphone
functionality and also voting functionality
(Open/Close voting sessions).
The registering unit to identify it can use the External Identity. The CU includes the External Identity,
when the assigned address is transmitted to the external control unit. The External Identity can be
assigned any 8-bit value; also 0.
EXTERNAL_HEART_BEAT_RESPONSE
Command item value: 4
Message format:
<START> ‘j’ <ID> <0> <MSB addr> <LSB Addr> <27> <4> <0> <0> <CRC> <STOP>
The external control unit should send this message as reply to EXTERNAL_HEART_BEAT_REQUEST
messages from the CU in order to indicate that the external controller is still present.