User`s guide

Chapter 5 - I/O Commands
1PPS TIME OFFSET COMMAND (@@Ay)
Applicability: M12+ Timing Receivers
The M12+ outputs a one pulse-per second (1PPS) signal with the rising edge placed on top of the
UTC or GPS one second tic mark, depending on which time reference has been selected by the
user. The 1PPS Time Offset command allows the user of M12+ Timing Receivers to offset the
1PPS time mark in one nanosecond increments. This offset can be used to place the 1PPS signal
anywhere within the one second epoch.
The resolution of this parameter is one nanosecond. This does not imply that the 1PPS output by
the M12+ is accurate to this level. This command only allows the user to change the location of
the average placement of the pulse.
The absolute accuracy of the signal is a function of GPS time accuracy, and is subject to
degradation due to U.S. Department of Defense policy.
Range: 0.000000000 to 0.999999999 s
Default value: 0.000000000 s
Resolution: 1 ns
Legacy Code Compatibility: The @@Ay command was implemented in an identical fashion on
Motorola UT+ and VP timing receivers.
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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