Specifications

Command/Response Formats 173
Commands
Table 6.107 on page 173 describes each item in a typical POS message.
PTT: Pulse Time Tag message
$PASHS,NME,PTT,c,s
Enable/disable output of PPS pulse time tag message, where c is the output port, and s
is ON or OFF. The reponse message is output as soon as possible after the PPS pulse
is generated (with minimum latency, < 50 ms if PPS offset is 0, otherwise < 150 ms),
and contains the GPS time at which the latest PPS was sent, including the offset if an
offset was set when the PPS pulse was enabled.
The period of the PTT message is independent of the NMEA period. It is only linked
to the PPS period.
Table 6.107: Typical POS Message
Item Significance
$PASHR,POS Header
0 Raw Position
06 Number of SVs used in position fix
214619.50 UTC time of position fix
3722.385158 Latitude
N North Latitude
121159.833768 Longitude
W West Longitude
00043.110 Altitude (meters)
empty field reserved
331.0 Course over ground (degrees)
000.7 Speed over ground (knots)
000.0 Vertical velocity (dm/sec)
02.7 PDOP
01.2 HDOP
02.4 VDOP
01.6 TDOP
UC00 Firmware version ID
*6C checksum