Specifications

Danish Interpretation Systems Technical Specifications
Printed in Denmark
52
6.1.2 Step(2) – Requesting registration in the CU
After entering microphone control mode, it is time to send a registration request to the CU. The control
message required to do registration is EXTERNAL_NEW_UNIT in the EXTERNAL_CONTROL_GRP.
Again the five steps of above must be completed to find the full control message to send:
Step Action Control Message
1
Deciding MessageType and contents.
Message Type: ‘j’.
Contents: <0> <15> <173> <27> <1> <12> <External
Identity>
For this example the External Identity is set to 60.
‘j’
+
<0> <15> <173> <27> <1>
<2> <60>
2 Deciding the ID of the message.
The ID before was 0, so now 1 is used.
‘j’ <1> <0> <15> <173> <27>
<1> <2> <60>
3 CRC calculation
The CRC of the message becomes 184.
‘j’ <1> <0> <15> <173> <27>
<1> <2> <60> <184>
4 Check for Escape characters
No use of values 252, 253 or 254.
‘j’ <1> <0> <15> <173> <27>
<1> <2> <60> <184>
5 Addition of start and stop <252> ‘j’ <1> <0> <15> <173>
<27> <1> <2> <60> <184>
<253>
The resulting control message becomes:
<252> ‘j’ <1> <0> <15> <173> <27> <1> <2> <60> <184> <253>
or
[FC] [6A] [01] [00] [0F] [AD] [1B] [01] [02] [3C] [B8] [FD]