Kantronics KPC–3 Plus User Manual

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Kantronics KPC–3 Plus User Manual Manual pdf 95 page image

95GPS Unit Initialization from the TNCSome GPS receivers require reception of a special string of characters for initializationbefore they will send any information. You can tell your TNC to send the initializationstring to your GPS unit by entering the required string using the GPSINIT command. Forinstance, if your GPS receiver requires the string $PGRMO,GPGGA,1 to be sent, youwould give the commandGPSINIT $PGRMO,GPGGA,1to your TNC. Upon power up, the TNC will then send that string via its serial port to theGPS unit (when the TNC INTFACE command is set to GPS.)GPS OperationsStarting the TNC in GPS ModeHint: Be sure to set ABAUD to that required by your GPS unit.Once you have the TNC parameters set for GPS, you need to set the TNC to start inGPS Mode on power up. To do this, set the INTFACE command to GPS. When theTNC resets (either from a RESET command or by turning the TNC off and then on) itwill be in the GPS Mode and the GPSINIT string (if any) will be sent to the serial port.Normally, you would set the INTFACE command to GPS, turn the TNC off, connect yourGPS unit, and then turn the GPS unit ON and then turn the TNC ON.When operating in the GPS Mode, the TNC will automatically update the LT buffersevery time it receives the designated NMEA strings from the GPS receiver.Exiting GPS ModeIf you want to exit the GPS Mode (perhaps to set new parameters), connect yourcomputer or terminal to the serial port of the TNC and type three characters.The TNC will reset and the INTFACE command will be set to TERMINAL.Hint: You may have changed the ABAUD setting (usually to 4800) for the GPS mode. Ifso, before you can use the three characters to exit GPS mode, you must setyour RS232 baud in your computer to the same as the ABAUD setting in your TNC.Other GPS FeaturesSlotted BeaconsThe BLT command provides for the ability to specify not only the interval betweenbeacons, but a starting time for the beacons. This permits a ―slotted‖ system of beaconsby numerous stations. For instance, lets say your local area has 30 stations that eachshould beacon their location every 30 minutes. A beacon would be transmitted every n

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