Garmin GPS 18 010-00321-56 User Manual

GPS 18 Technical Specifications (190-00307-00)

Rev. D

Page 14

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>*hh<CR><LF>

<1>

NMEA 0183 output time 1 to 900 (sec). Not applicable to GPS 18-5Hz, which always outputs
data at 5 Hz (200 ms)

<2>

Binary Phase Output Data, 1 = Off, 2 = On.

<3>

Automatic Position Averaging when Stopped, 1 = Off, 2 = On

<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>

Adaptive Transmission Enabled, 1 = Off, 2 = On

<11>

Auto Power Off, 1 = Off, 2 = On

<12>

Power On with External Charger, 1 = Off, 2 = On

<13>

Measurement Pulse Output Auto Off Mode, 1 = Off, 2 = On

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. Send the sentence “$PGRMI,,,,,,,R” to command a
reset (refer to Section 

). 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 Phase
Output Data format:

10 0A 02 26 00 CE 10 03 (Hexadecimal)

The $PGRMO sentence provides the ability to enable and disable specific output sentences.  The following
sentences are enabled at the factory for the GPS 18 PC and LVC: GPGGA, GPGSA, GPGSV, GPRMC,
and PGRMT.

The following sentences are enabled at the factory for the GPS 18-5Hz: GPGGA, GPGSA, GPRMC,
GPUTG, 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:

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 (for example,
$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 will cause the GPS sensor to transmit all stored almanac information.  All other

NMEA 0183 sentence transmission will be suspended temporarily.

5.  $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 18 series product software updates.