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Danish Interpretation Systems Technical Specifications
Printed in Denmark
54
6.Receiver address checking
Besides the above 5 steps, the external control unit must verify that the control message needs to be
treated. This is done by checking the receiver address.
Receiver Address = MSB addr * 256 + LSB addr = 4013
4013 is the group address of external control units, and that naturally needs to be handled.
7.Determining the message group and the contents of the control message:
The message group is 27, and the command item is 2 (EXTERNAL_UNIT_ADDRESS).
The contents of the control message has the following format:
<START> 'c' <ID> <MSB addr> <LSB addr> <27> <4> <2> <Addr MSB> <Addr LSB> <External Identity> <CRC>
<STOP>
where the new address applying to the control unit is extracted as part of the data:
New External Unit Addr = Addr MSB * 256 + Addr LSB = 3900
and
External Identity = 60
So, in the future communication between the external control unit and the CU, the external control unit
must use the address 3900.