96 G12 OEM Board & Sensor Reference Manual
The G12 has a “watchdog” timer. If the processor hangs up for any reason, the watchdog timer will
reset the receiver. On reset, the receiver parameters most recently saved using the set command
$PASHS,SAV will be used at startup following the reset. If parameter settings were not saved, the
default settings will be used at startup.
SEM: Secondary Elevation Mask
$PASHS,SEM,d1,d2,d3
This command allows you to set a secondary elevation mask angle value for a
sector of the sky defined by two azimuth angles. The second sector is the region
between the first and second azimuths measured clockwise from North. d1 is the
secondary elevation mask angle. d2 is the first azimuth defining the second sector.
d3 is the second azimuth defining the secondary sector.
When you send the SEM command, it overrides any previously existing values.
PEM commands issued after the SEM command change the elevation mask for
only the primary PEM zone. The previously issued SEM setting continues in effect.
To apply PEM to the whole sky, you must disable the SEM.
Example
Enter the following commands to set the mask zone in Figure 4.1.
$PASHS,PEM 10
$PASHS,SEM,20,300,60
—OR—
$PASHS,PEM 20
DEFAULT SETTING
SEM— OFF
G12RevD.book Page 96 Tuesday, April 2, 2002 4:33 PM
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