Baud Rate Selection - Garmin TracPak GPS 30/30 SL Manual

4.3 BAUD RATE SELECTION

4.3.1 GPS 30
Baud rate selection is performed by the GPS 30 prior to the
first sentence being transmitted. To ensure the GPS 30
selects the correct baud rate, the RXD2 (and RXD1, if
applicable) input signals should remain at the appropriate
baud rate selection levels until the first sentence is
transmitted. After the first sentence is transmitted, the host
system is free to use the RXD1 and RXD2 inputs to transmit
initialization and configuration sentences to the GPS 30 at
the selected baud rate.
Baud rate selection is accomplished by proper connection
of RXD1 (blue) and RXD2 (green) to a voltage greater than
3 vdc. Note that the absolute maximum voltage that should
be applied to these inputs is +25 vdc. If using the main
supply voltage to perform baud rate selection, make sure
the voltage is less than 25 vdc to avoid damaging the GPS
30.
Baud RXD1
Blue
1200 NC/0V
2400 3V-15V
4800 NC/0V
9600 3V-15V
4.3.2 GPS 30 SL
Baud rate selection on the GPS 30 SL is done via the
$PGRMC sentence. Refer to Section 4.1.3.
RXD2
Green
3V-15V
3V-15V
NC/0V
NC/0V
30