Garmin GPS Receiver Garmin 18X GPS Receiver Module User Manual

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190-00879-08 GPS 18x Technical Specifications Rev. D
Page 14
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 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 GPS sensor.
$PGRMC1,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>,<14>,<15>*hh<CR><LF>
<1>
NMEA 0183 output time 1 to 900 (sec). Not applicable to GPS 18x-5Hz, which always outputs data at
5 Hz (200 ms)
<2>
Binary Output Data, 1 = Off, 2 = On.
<3>
No Effect (This field is not used on this model and is included only for backwards compatibility)
<4>
No Effect (DGPS beacon frequency: 0.0, 283.5 to 325.0 kHz in 0.5 kHz steps)
<5>
No Effect (DGPS beacon bit rate: 0, 25, 50, 100, or 200 bps)
<6>
No Effect (DGPS beacon scanning, 1 = Off, 2 = On)
<7>
NMEA 0183 version 2.30 mode indicator, 1 = Off, 2 = On
<8>
DGPS WAAS mode, W = WAAS Enabled, N = WAAS Disabled
<9>
Power Save Mode, P = Power Save mode, N = Normal
<10>
No Effect (This field is not used on this model and is included only for backwards compatibility)
<11>
No Effect (This field is not used on this model and is included only for backwards compatibility)
<12>
No Effect (This field is not used on this model and is included only for backwards compatibility)
<13>
Measurement Pulse Output Auto Off Mode, 1 = Off, 2 = On
<14>
No Effect (This field is not used on this model and is included only for backwards compatibility)
<15>
Low Velocity Threshold , 1 = Off, 2 = On
Configuration changes take effect immediately, with the exception of Binary Output Data, which takes effect on the
next power cycle or a reset event. Send the sentence “$PGRMI,,,,,,,R” to command a reset (refer to section 4.1.2
Sensor Initialization Information (PGRMI)). If the GPS sensor is in the Binary data mode, it is necessary to send the
following eight-byte data stream to temporarily change the data format to NMEA 0183. Then follow by sending a
PGRMC1 sentence that turns off the Binary 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 for the GPS 18x PC and LVC: GPGGA, GPGSA, GPGSV, GPRMC, and PGRMT.
The following sentences are enabled at the factory for the GPS 18x-5Hz: GPGGA, GPGSA, GPRMC, GPVTG, and
PGRMT.
$PGRMO,<1>,<2>*hh<CR><LF>
<1>
Target sentence description (for example, 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), 4 = Restore factory
default output sentences
The following notes apply to the PGRMO input sentence:
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 (for example, $PGRMO,,3), or the
mode field may contain from 1 to 5 characters.
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.
If either the target sentence mode field or the target sentence description field is not valid, the PGRMO sentence will
have no effect.
$PGRMO,GPALM,1 will cause the GPS sensor to transmit all stored almanac information. All other NMEA 0183
sentence transmission will be suspended temporarily.
$PGRMO,,G will cause the COM port to change to Garmin Data Transfer format for the duration of the power
cycle. The Garmin mode is required for GPS 18x series product software updates.

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