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SPSx51 Modular GPS Receivers User Guide 177
Receiver Connector Pinout Information I
ASCII time tag
Each time tag is output about 0.5 second before the corresponding pulse. Time tags are
in ASCII format on a user-selected serial port. The format of a time tag is:
UTC yy.mm.dd hh:mm:ss ab
Where:
• UTC is fixed text.
• yy.mm.dd is the year, month, and date.
• hh:mm:ss is the hour (on a 24-hour clock), minute, and second. The time is in
UTC, not GPS.
• a is an integer number representing the position-fix type:
1 = time only
2 = 1D & time
3 = currently unused
4 = 2D & time
5 = 3D & time
• b is the number of GPS satellites being tracked.
• Each time tag is terminated by a carriage return, line feed sequence. A typical
printout looks like:
UTC 02.12.21 20:21:16 56
UTC 02.12.21 20:21:17 56
UTC 02.12.21 20:21:18 56
Note – If the receiver is not tracking satellites, the time tag is based on the receiver clock. In
this case, a and b are represented by “??”. The time readings from the receiver clock are less
accurate than time readings determined from the satellite signals.