In this case, these two users would never beacon at the same time, in fact they
would beacon 1 minute apart. Using this system for our example, it is possible to
set all thirty users to beacon one minute apart, avoiding collisions.
Tracking Without Beacons
You may configure the TNC to store the LT “beacons” in the LTRACK buffer
without transmitting the beacons. To do this, set the LTP to NONE for the associ
-
ated LT buffer:
LTP 1 NONE
When the destination call (path) is set to NONE, the TNC will not transmit the
beacon, but since the BLT command is still active, the data will be stored in the
LTRACK buffer.
Remote Access and GPS
When the TNC is in GPS Mode, the serial port is expecting data only from a GPS
unit, hence, it cannot process any “normal” commands. Should you need to
change any of the TNC commands, however, there are two options: 1) exit the
GPS Mode using a terminal, or 2) connect to the TNC remotely by radio
(MYREMOTE) and change the commands.
When you connect remotely to the TNC (and properly respond to the password
security check) you can change any parameters including the GPS parameters.
You may also wish to send a command string to your GPS unit. This is accom
-
plished with the RPRINT command. For example, to send the string
$PGRMO,GPGSA,1 to the GPS unit, connect to the MYREMOTE of the TNC,
verify the password, and send
RPRINT $PGRMO,GPGSA,1
to the MYREMOTE. The TNC simply sends this string to its serial port (which is
connected to the GPS receiver).
Packet Modes of Operation GPS NMEA Interfacing Capability
User’s Guide 186 KAM’98 v 8.3
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