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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>*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 25LP 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.
