TM8100/TM8200 Computer-Controlled Data Interface (CCDI) Protocol Manual CCDI 37
© Tait Electronics Limited April 2007
SENDING” has been sent to the DTE. Otherwise, the RU will return an
error message (RU busy error).
TDMA requires an input transition from inactive to active on a TDMA
input to commence the transmission over the air.
The TDMA input “GTC” (Go to Channel) has to be activated and TDMA
data transmission will commence with the transition from inactive to active
on the TDMA input “Send Packet”.
Closing a TDMA
Channel
The CLOSE_TDMA_DATA_CHANNEL command requests the RU to
unassign a currently configured TDMA data channel. This channel will
subsequently be unavailable for TDMA data transmission or reception.
Format z [SIZE] [SUB_FUNCTION] [CHANNEL_NO] [DATA]
[CHECKSUM]
■ ‘z’ is a single ASCII character and represents the TDMA command.
■ [SUB_FUNCTION] is a one-digit ASCII character specifying the
TDMA sub-function.
■ 0 = OPEN_TDMA_CHANNEL
■ 1 = QUEUE_TDMA_DATA_FOR_SENDING
■ 2 = CLOSE_TDMA_CHANNEL
■ [CHANNEL_NO] is a two-digit string specifying the TDMA decimal
channel number. The value of the channel number must be a valid
TDMA channel for the RU being controlled (range of allowed values
depends upon the RU’s programming). If the RU is in emergency mode
then no channel change occurs and the radio will return an error message
indicating it is busy. The RU will not give any audible indications for
channel change requests. Should the channel not be a TDMA channel,
then CCDI will return an error message (Command not accepted error)
and the RU will not change channel.
■ [DATA] is a maximum of 128 bytes of TDMA data (only used with
[SUB_FUNCTION] 0 (QUEUE_TDMA_DATA_FOR_SENDING).
Valid in conventional mode only.
Examples z030458A specifies a channel change to TDMA channel 45.
z0B10412345678DB stores “12345678” in the TDMA data buffer for
TDMA channel 04.
z032058C closes the TDMA services on TDMA channel 05.
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