Garmin GPS 35 LP Technical Specification page 20

All configuration changes take effect after receipt of a valid value except baud rate and PPS mode.
Baud rate and PPS mode changes take effect on the next power cycle or an external reset event.
4.1.4 Additional Sensor Configuration Information (PGRMC1)
The $PGRMC1 sentence provides additional information used to configure the sensor board operation.
Configuration parameters are stored in non-volatile memory and retained between power cycles. The
GPS 35LP will echo this sentence upon its receipt if no errors are detected. If an error is detected, the
echoed PGRMC1 sentence will contain the current default values. Current default values can also be
obtained by sending $PGRMC1E to the board.
$PGRMC1,<1>,<2>,<3>,<4>,<5>,<6>,<7>*hh<CR><LF>
<1> NMEA output time 1-900 (sec).
<2> Binary Phase Output Data, 1 = Off, 2 = On.
<3> Position pinning, 1 = Off, 2 = On.
<4> DGPS beacon frequency – 0.0, 283.5 – 325.0 kHz in 0.5 kHz steps.
<5> DGPS beacon bit rate – 0, 25, 50, 100, or 200 bps.
<6> DGPS beacon auto tune on station loss, 1 = Off, 2 = On.
<7> Activate NMEA 2.30 mode indicator, 1 = Off, 2 = On.
Configuration changes take effect on the next power cycle or an external reset event. At power up or
external reset, a stored beacon frequency other than 0.0 causes the GPS 35LP to tune the beacon
receiver.
4.1.5 Output Sentence Enable/Disable (PGRMO)
The $PGRMO sentence provides the ability to enable and disable specific output sentences.
The following sentences are enabled at the factory: GPGGA, GPGSA, GPGSV, GPRMC, and PGRMT.
$PGRMO,<1>,<2>*hh<CR><LF>
<1> Target sentence description (e.g., PGRMT, GPGSV, etc.)
<2> Target sentence mode, where:
0 = disable specified sentence
1 = enable specified sentence
2 = disable all output sentences
3 = enable all output sentences (except GPALM)
The following notes apply to the PGRMO input sentence:
1) If the target sentence mode is '2' (disable all) or '3' (enable all), the target sentence description is
not checked for validity. In this case, an empty field is allowed (e.g., $PGRMO,,3), or the mode
field may contain from 1 to 5 characters.
2) If the target sentence mode is '0' (disable) or '1' (enable), the target sentence description field must
be an identifier for one of the sentences being output by the GPS 25LP.
3) If either the target sentence mode field or the target sentence description field is not valid, the
PGRMO sentence will have no effect.
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