87
Commands
PPS: Pulse Per Second
$PASHS,PPS,f1,f2,c1
The G12 can generate a timing pulse with programmable period and offset. The
timing pulse is a square-wave signal which is generated by default once every
second (1PPS) with its rising edge synchronized to the GPS time and no offset from
GPS time. The PPS command allows you to change the period, offset (from GPS
time), and synchronization edge of the pulse. The f1 parameter sets the period of
the pulse in seconds with a range between 0.10 and 99.90. The minimum setting
and increment depend upon the receiver update rate, which is dependent upon the
installed position update rate or raw data update options. The f2 parameter is the
offset from GPS time in milliseconds, with 100 ns resolution (range between -
999.9999 and +999.9999). The c1 parameter determines whether the GPS time is
synchronized with the rising edge of the pulse (R) or the falling edge of the pulse (F).
c1 Latitude sector N / S
m3 Current longitude measured in degrees,
minutes, and decimal minutes
(dddmm.mmmmm)
0°-180°
c2 Longitude sector E / W
f1 Current altitude (±aaaaa.aa) ellipsoid height
in meters. In 2-D positioning mode, this field
contains the fixed altitude value
-3000.00 to
+3000.00
,, Reserved data field
f2 Course over the ground (ttt.tt); referenced to
true north
0.00°-359.99°
f3 Speed over the ground (knots) 000.00 to 999.99
f4 Vertical velocity (meters per second) -999.9 to +999.9
f5 Current computed PDOP value 0.00-99.9
f6 Current computed HDOP value 00.0-99.9
f7 Current computed VDOP value 0.00-99.9
f8 Current computed TDOP value (seconds) 0.00-99.9
s1 Firmware version code 4-character ASCII
hh Checksum 2-character hex
Table 4.30. $PASHR,POS Message Format (Continued)
Parameter Description Range
G12RevD.book Page 87 Tuesday, April 2, 2002 4:33 PM
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