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Connecting to a GPS Device (Optional)
To use your KPC-3 Plus with a GPS device, you can connect the data output from the
GPS device to either the DSUB-25 ―Computer" port (i.e., serial port) on the back of the
KPC-3 Plus or alternately, to a pin on its radio port.
Since you need to remove the computer‘s serial modem cable from the KPC-3 Plus‘
―Computer‖ port and replace it with the GPS‘s cable before you can use the GPS device
with the KPC-3 Plus, you will need to use your computer to configure your KPC-3 Plus
to work with the GPS device before you connect your GPS device to your KPC-3 Plus.
Note: You can attach both the KPC-3 Plus and a GPS device to your computer at the
same time, using an APRS HSP (hardware single port) cable and the APRS program.
Since cabling may vary from one GPS vendor to another, the cable is not supplied with
your KPC-3 Plus. You will need to purchase or make a cable, using the specifications in
your GPS manual.
To connect the GPS receiver and the KPC-3 Plus as a ―Stand-alone‖ position reporting
system without a computer, you will need to connect a minimum of 2 wires for data flow
from the GPS receiver to the KPC-3 Plus. Connect the GPS receiver ―DATA OUTPUT‖
to TXD (pin 2) on the KPC-3 Plus. Connect the GPS receiver ―SIGNAL GROUND‖ to
signal ground (pin 7) on the KPC-3 Plus. Your GPS receiver may require other pins to
be connected, check its documentation.
An alternate input is available in the KPC-3 Plus (at firmware version 8.3 or later) for
GPS data, on its ―Radio‖ port. The alternate GPS data input is enabled with the
command GPSPORT, and uses pin 2 on the KPC ―Radio‖ port.
See your GPS manual and the chapter in this manual on ―GPS NMEA Interfacing
Capability‖ for details on using your GPS device with your KPC-3 Plus based packet
radio station.
Note: some weather station devices have data outputs similar to GPS devices. The
configuration of the KPC, and connection to the device is the same.
This concludes the installation of your station.
For more information on installation topics, see the appendices.
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