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Danish Interpretation Systems Technical Specifications
Printed in Denmark
10
3.4 Message types
The following sections describe the types of messages that are sent between the CU and the external
control unit. For each message type the format of the messages of this type is shown, this description
excludes the start/stop delimiters and the CRC. The field <ID> in the following descriptions refers to
the identifier byte introduced in section 3.1.
3.4.1 CU reset (CU
external)
When the CU powers up, it transmits a binary message on the serial interface, in order to inform
external control units, that the DCS 6000 system (CU) has been turned on.
The format of the CU reset message is:
<START> ‘r’ <ID> <CRC> <STOP>
3.4.2 Change binary Control Mode (external
CU)
This message is sent from the external controller to the CU in order to change the binary control mode
of the serial interface. The message format is either
<START> ‘m’ <ID> ‘c’ ‘m’ <CRC> <STOP>
which changes the mode to microphone control mode. Or
<START> ‘m’ <ID> ‘q’ <CRC> <STOP>
which leaves the microphone control mode.
3.4.3 Send Control Message to CU (external
CU)
This message is used to send a DCS 6000 message to the CU asking it to perform some operation or
deliver some data. The messages available are discussed in section 4.3. The format of the message is:
<START> ‘j’ <ID> <Chain> <MSB addr> <LSB Addr> <Message Group> <Data 1> <Data 2> <Data 3> <CRC> <STOP>
Chain is the chain number the control job originates from. This field exists because the command can
be used to simulate control jobs originating from messages on the DCS 6000 bus. Just set this value to
0.
LSB addr and MSB addr are the least respectively the most significant bytes of the external control
units address. See section 5.2 on how to obtain a unique address for an external control unit.
Message Group defines the message group of the message to send. The message groups are defined in
section 4.3.