Spectra Precision ProFlex 800 Reference Manual - Manual (Page 702)

688
Data Output
TTT: Event Marker
Content This message delivers the exact GPS time, to within
1 μsecond, when an external event is detected.
The message is sent through port B, where the event marker
input pin is located, and not through the port specified by the
$PASHS, NME command.
The message is therefore independent of the NMEA output
rate. It can be output at a faster or slower rate than the NMEA
rate, depending on the recurrence of the event.
The message is as follows:
$PASHR,TTT,d1,m2*cc
d1 and m2 are described in the table below.
Example $PASHR,TTT,3,18:01:33.1200417*AC
See Also $PASHS,NME,TTT
Parameter Description Range
d1 Day in week (1: Sunday; 7: Saturday) 1-7
m2
GPS time tag, in hours, minutes and sec-
onds
0-23:59:59.9999999
*cc Checksum *00-*FF