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190-00266-01 GPS 15H & 15L Technical Specifications Rev. D
Page 13
4.1.4 Additional Sensor Configuration Information (PGRMC1)
The $PGRMC1 sentence provides additional information used to configure the GPS sensor operation.
Configuration parameters are stored in non-volatile memory and retained between power cycles. The GPS
sensor echoes 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 GPS sensor.
$PGRMC1,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>*hh<CR><LF>
<1> NMEA 0183 output time 1-900 (sec)
<2> Binary Phase Output Data, 1 = Off, 2 = On
<3> Automatic Position Averaging when Stopped, 1 = Off, 2 = On
<4> DGPS beacon frequency – 0.0, 283.5 – 325.0 kHz in 0.5 kHz steps
<5> DGPS beacon bit rate – 0, 25, 50, 100, or 200 bps
<6> DGPS beacon scanning, 1 = Off, 2 = On
<7> NMEA 0183 version 2.30 mode indicator, 1 = Off, 2 = On
<8> DGPS mode, A = Automatic, W = WAAS Only, R = RTCM Only, N = None (DGPS
disabled)
<9> Power Save Mode, P = Power Save mode, N = Normal
At power up or external reset, a stored beacon frequency other than 0.0 causes the GPS sensor to tune the
beacon receiver. Configuration changes take effect immediately, with the exception of Binary Phase Output
Data, which takes effect on the next power cycle or a reset event. A reset can be commanded by sending
the sentence “$PGRMI,,,,,,,R” (refer to section
4.1.2).
If the GPS sensor is in the Binary data mode, it is necessary to send the following eight-byte data stream to
the COM 1 input to temporarily change the data format to NMEA 0183. Then send a PGRMC1 sentence
that turns off the Binary Phase Output Data format:
10 0A 02 26 00 CE 10 03 (Hexadecimal)
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, PGRMB, PGRME, PGRMM,
PGRMT, and PSLIB.
$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 (except PSLIB)
3 = enable all output sentences (except GPALM)
4 = restore factory default output sentences
The following notes apply to the PGRMO input sentence:
1. If the target sentence mode is ‘2’ (disable all), ‘3’ (enable all), or ‘4’ (restore defaults), 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 that can be output by the GPS sensor.
3. If either the target sentence mode field or the target sentence description field is not valid, the PGRMO
sentence will have no effect.
4. $PGRMO,GPALM,1 causes the GPS sensor to transmit all stored almanac information. All other
NMEA 0183 sentence transmission is suspended temporarily.
5. $PGRMO,,G causes the COM 1 port to change to Garmin Data Transfer format for the duration of the
power cycle. The Garmin mode is required for GPS 15H & 15L product software updates.