Tait TM8100 Protocol Manual
Also see for TM8200 mobiles: Service manualInstallation guideInstallation guideAccessories manualOperator's manual
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Contents
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36 CCDI TM8100/TM8200 Computer-Controlled Data Interface (CCDI) Protocol Manual© Tait Electronics Limited April 2007■ [MESSAGE] is optional. The field is limited to 32 hex characters instandard ASCII range 20h to 2Fh. Characters between 00 and FFh canbe sent but characters above 7Fh can not be displayed.Examples s0A051234567813transmits data identity “12345678” with 100mslead-in delay through current channel.s0CFF12345678Hi39transmits data identity “12345678” and SDMdata “Hi” with 5.1s lead-in delay through current channel.1.9.8 TDMAThe TDMA commands consist of three sub-functions for opening a TDMAchannel, sending TDMA data, and closing a TDMA channel.Opening a TDMAChannel Before sending or receiving TDMA data, a TDMA channel must be openedusing the OPEN_TDMA_CHANNEL command.The OPEN_TDMA_CHANNEL command instructs the RU to prepareTDMA services on a specified TDMA channel (conventional mode) and toconfigure the modulation scheme and packet size according to the settingsin the database.Note A TDMA channel is different to a “normal” channel with thesame channel number.Sending TDMA Data Sending TDMA data requires a second TDMA command,QUEUE_TDMA_DATA_FOR_SENDING. This command requests theRU to queue data in a dedicated TDMA data buffer for transmission.The QUEUE_TDMA_DATA_FOR_SENDING command passes amaximum of 128 data bytes to the TDMA module. However, the data sizeactually used for over-the-air transmission is a programmable parameter foreach channel. The TDMA transmission module will ignore any dataexceeding the programmed packet size of the current channel.Should the data size in the CCDI command exceed 128 bytes, then an errormessage (Command not accepted error) will be returned.If the specified channel is not programmed for TDMA data transfer, or if thespecified channel had not been opened for TDMA using theOPEN_TDMA_CHANNEL command, then CCDI will return a TDMAstatus message indicating the failure of the command execution.A second QUEUE_TDMA_DATA_FOR_SENDING command can onlybe accepted after the progress message “TDMA DATA QUEUED FOR |
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