19if no errors are detected. If an error is detected, the echoed PGRMC1 sentence willcontain the current default values. Current default values can also be obtained bysending $PGRMC1E to the board.$PGRMC1,<1>,<2>*hh<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 theGPS 25LP to tune the beacon receiver.4.1.5 Output Sentence Enable/Disable (PGRMO)The $PGRMO sentence provides the ability to enable and disable specific outputsentences.The following sentences are enabled at the factory: GPGGA, GPGSA, GPGSV,GPRMC, and PGRMT.$PGRMO,<1>,<2>*hh<1> Target sentence description (e.g., PGRMT, GPGSV, etc.)<2> Target sentence mode, where:0 = disable specified sentence1 = enable specified sentence2 = disable all output sentences3 = 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 targetsentence description is not checked for validity. In this case, an empty field isallowed (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 sentencedescription field must be an identifier for one of the sentences being output by theGPS 25LP.
