Garmin GPS 17HVS - Receiver Module Teknik Özellikler - Sayfa 17
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4.1.2
Sensor Initialization Information (PGRMI)
The $PGRMI sentence provides information used to initialize the GPS sensor's set position and time used for
satellite acquisition. Receipt of this sentence by the GPS sensor causes the software to restart the satellite acquisition
process. If there are no errors in the sentence, it will be echoed upon receipt. If an error is detected, the echoed
PGRMI sentence will contain the current default values. Current PGRMI defaults (with the exception of the
Receiver Command, which is a command rather than a mode) can also be obtained by sending $PGRMIE to the
GPS sensor.
$PGRMI,<1>,<2>,<3>,<4>,<5>,<6>,<7>*hh<CR><LF>
<1>
Latitude, ddmm.mmm format (leading zeros must be transmitted)
<2>
Latitude hemisphere, N or S
<3>
Longitude, dddmm.mmm format (leading zeros must be transmitted)
<4>
Longitude hemisphere, E or W
<5>
Current UTC date, ddmmyy format
<6>
Current UTC time, hhmmss format
<7>
Receiver Command, A = Auto Locate, R = Unit Reset
4.1.3
Sensor Configuration Information (PGRMC)
The $PGRMC sentence provides information used to configure the GPS sensor's 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 PGRMC sentence will contain
the current default values. Current default values can also be obtained by sending $PGRMCE to the GPS sensor.
$PGRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>,<14>*hh<CR><LF>
<1>
Fix mode, A = automatic, 2 = 2D exclusively (host system must supply altitude),
3 = 3D exclusively
<2>
Altitude above/below mean sea level, -1500.0 to 18000.0 meters
<3>
Earth datum index. If the user datum index (96) is specified, fields <4> through <8> must contain valid
values. Otherwise, fields <4> through <8> must be null. Refer to
earth datums and the corresponding earth datum index.
<4>
User earth datum semi-major axis, 6360000.000 to 6380000.000 meters (.001 meters resolution)
<5>
User earth datum inverse flattening factor, 285.0 to 310.0 (10
<6>
User earth datum delta x earth centered coordinate, -5000.0 to 5000.0 meters (1 meter resolution)
<7>
User earth datum delta y earth centered coordinate, -5000.0 to 5000.0 meters (1 meter resolution)
<8>
User earth datum delta z earth centered coordinate, -5000.0 to 5000.0 meters (1 meter resolution)
<9>
Differential mode, A = automatic (output DGPS data when available, non-DGPS otherwise), D =
differential exclusively (output only differential fixes)
<10>
NMEA 0183 Baud rate, 1 = 1200, 2 = 2400, 3 = 4800, 4 = 9600, 5 = 19200, 6 = 300, 7 = 600, 8 = 38400
<11>
Velocity filter, 0 = No filter, 1 = Automatic filter, 2 to 255 = Filter time constant (e.g., 10 = 10 second
filter)
<12>
PPS mode, 1 = Off, 2 = On
<13>
PPS pulse length, 0 though 48 = (n+1)*20 ms.
Example: n = 4 corresponds to a 100 ms wide pulse
<14>
Dead reckoning valid time 1to 30 (sec)
All configuration changes take affect after receipt of a valid value except baud rate and PPS mode. Baud rate and
PPS mode changes take effect on the next power cycle or an external reset event.
190-00228-21
GPS 16/17 Technical Specifications
Page 13
Appendix A: Earth Datums
-9
resolution)
for a list of
Rev. A