TM8100/TM8200 Computer-Controlled Data Interface (CCDI) Protocol Manual
CCDI
33
© Tait Electronics Limited
April 2007
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[DATA_MESSAGE_ID] is an 8-character string representing the SDM
data identity of the radio to which the SDM is being sent. It can be any
alphanumeric characters. “
*
” is the wildcard for any character. e.g.
12
**
5678. The first four bytes are generally the fleet identity, the second
four the radio identity.
When a radio receives a SDM message, the data identity is checked
against the ‘Unit Data Identity’ set in the Data form of the programming
application. Refer to
. If the data identity
matches, the received SDM data is stored and the radio sends a response.
If the data identity does not match then the SDM data is ignored.
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[MESSAGE] is optional and contains up to 32 characters of SDM text,
or 128 characters for extended SDM. Either standard 8-bit ASCII range
or binary can be sent, depending on the GFI.
Example
a0FFF20012345678Hi4A
This message transmits text data message ID
“12345678” and SDM data “Hi” with 5.1s
lead-in delay through the current channel.
Extended SDM
An adaptable SDM with a SFI of 04 can have up to 128 bytes of data. This
is split up into multiple SDMs where the following SDMs will have a SFI of
05. The SDM can be either Text or Binary.
CCR SDM
(TM8100 only)
An adaptable SDM with a GFI of 2 and a SFI of 03 is passed to the CCR
module, in radios that support CCR and are currently in CCR mode. The
[MESSAGE] part of the SDM is stripped out of the SDM and passed to the
CCR module as a CCR command.
The SDM can only be text as CCR commands are in ASCII.
Example
a130520312345678M01D0E36
transmits data message ID “12345678” and the CCR
command “M01D0E” with 100 ms lead in delay through the
current channel.
NMEA Request SDM
An adaptable SDM with a GFI of 2 and a SFI of 06 requests the receiving
radio to return an Extended SDM, with the next NMEA message received
of the requested type. The SDM may only be Text as NMEA messages are
in ASCII.
The message of the SDM can contain a radio ID return address.
Format
[MESSAGE]=[NMEA_ADDRESS_FIELD][,][RADIO_ID]
2
04/05 Text
ASCII SDM up to 128 bytes
2
06
NMEA Request
Requests an NMEA string to be
returned as a Text SDM
