EndRun Meridian II, User Manual

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M e r i d i a n I I U s e r M a n u a l 190
A P P E N D I X H
IEEE-1344 Bit Definition
Bit Position Bit Definition Explanation
P50 Year, BCD1 Unit years
P51 Year, BCD2
P52 Year, BCD4
P53 Year, BCD8
P54 Not used
P55 Year, BCD10 Tens years
P56 Year, BCD20
P57 Year, BCD40
P58 Year, BCD80
P59 P6 Position identifier
P60 Leap second pending Set to one, 59 seconds prior to leap insertion
P61 Leap second 0 = add second, 1 = delete second
P62 Daylight Saving Time pending Set to one, 1 second prior to DST change
P63 Daylight Saving Time 1 = DST active
P64 Local offset sign 0 = +, 1 = -
P65 Local offset binary 1 Local offset from UTC time
P66 Local offset binary 2
P67 Local offset binary 4
P68 Local offset binary 8
P69 P7 Position identifier
P70 Local offset half hour bit 0 = none, 1 = half hour time offset added
P71 Time quality binary 1 Time quality indicates clock precision.*
P72 Time quality binary 2
P73 Time quality binary 4
P74 Time quality binary 8
P75 Parity Odd parity for all preceding data bits
P76-P78 Not used
P79 P8 Position identifier
* Refer to Appendix A - Time Figure-of-Merit for detailed information. Briefly:
3 time error is < 100 ns
4 time error is < 1 us
5 time error is < 10 us
6 time error is < 100 us
7 time error is < 1 ms
8 time error is < 10 ms
9 time error is > 10 ms, unsynchronized state if never locked to GPS.