M12 Oncore Users Guide Supplement - deetc - isel
M12 Oncore Users Guide Supplement - deetc - isel M12 Oncore Users Guide Supplement - deetc - isel
Motorola GPS Products M12 Oncore User’s Guide Supplement Revision 1.0 01/25/00 LEAP SECOND STATUS This command polls the receiver for leap second status infomation decoded from the Navigation Data message. The output response provides specific date and time information pertaining to any future leap second addition or subtraction. Present and future leap second values are also output rounded to the nearest integer value. This command has only a polled response, thus it must be requested each time leap second information is desired. Leap seconds are occasionally inserted in UTC and generally occur on midnight UTC June 30 or midnight UTC December 31. The GPS control segment typically notifies GPS users of pending leap second insertions to UTC several weeks before the event. When a leap second is inserted, the time of day will show a value of 60 in the seconds field. When a leap second is removed, the date will roll over at 58 seconds. 76
Input Command Response Message Motorola GPS Products M12 Oncore User’s Guide Supplement Revision 1.0 01/25/00 LEAP SECOND STATUS Motorola Binary Format • Poll Current Leap Second Pending States: @@GjC C checksum Message Length: 7 bytes • To above comand: @@GjpfyymdiffffhmsC p present leap second value f future leap second value yy year of the future leap second application m month of the future leap second application d day of the future leap second application i integer part of current UTC offset (seconds) ffff fraction part of current UTC offset (nanoseconds) h hour of the leap second application 0...23 m minute of the leap second application 0...59 s second of the leap second application 0...60 C checksum Message Length: 21 bytes 77
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Input Command<br />
Response Message<br />
Motorola GPS Products<br />
<strong>M12</strong> <strong>Oncore</strong> User’s <strong>Guide</strong> <strong>Supplement</strong><br />
Revision 1.0 01/25/00<br />
LEAP SECOND STATUS<br />
Motorola Binary Format<br />
• Poll Current Leap Second Pending States:<br />
@@GjC<br />
C checksum<br />
Message Length: 7 bytes<br />
• To above comand:<br />
@@GjpfyymdiffffhmsC<br />
p present leap second value<br />
f future leap second value<br />
yy year of the future leap second application<br />
m month of the future leap second application<br />
d day of the future leap second application<br />
i integer part of current UTC offset (seconds)<br />
ffff fraction part of current UTC offset (nanoseconds)<br />
h hour of the leap second application 0...23<br />
m minute of the leap second application 0...59<br />
s second of the leap second application 0...60<br />
C checksum<br />
Message Length: 21 bytes<br />
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