30 G12 OEM Board & Sensor Reference Manual
Saving Parameter Settings
New parameter settings can be saved by issuing the set command,
$PASHS,SAV,Y. You can verify that new settings are in effect by issuing query
commands to prompt the G12 for its current status. After the next power-up, the
query response messages display the new settings instead of the default
parameters. Issue the command $PASHS,RST to restore the default settings. If
the SAV command is not entered, the new settings will be lost, and the default
settings restored at the next power cycle.
Watchdog Timer
The G12 has a watchdog timer. If the processor hangs up for any reason, the
watchdog timer resets the receiver. On reset, the receiver uses the parameters
most recently saved during startup. If parameter settings were not saved, the
receiver uses the default settings at startup.
Position Modes
The G12 can perform position computations in four modes. The $PASHS,PMD
command allows you to set the position mode (page 82).
• Position Mode 0
At least four satellites at elevations equal to or above the position
elevation mask are needed to compute a position. The receiver stops
computing positions if the number of satellites tracked falls below three. All
three polar coordinates (latitude, longitude, altitude) are computed in this
mode.
• Position Mode 1
At least three satellites with elevation equal to or above the position
elevation mask are needed to compute a position. Only the latitude and
the longitude are computed if three satellites are locked and the altitude is
held fixed. For more information on fixed altitude modes, see”Fixed
Altitude Modes” on page 31. The receiver stops computing positions if the
number of satellites tracked falls below three. All three polar coordinates
are computed if more than three satellites are locked.
CAUTION
User-entered parameters are lost and default settings are restored if the
command $PASHS,SAV,Y is not entered before the next power cycle.
G12RevD.book Page 30 Tuesday, April 2, 2002 4:33 PM
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