Trimble Outdoors SK8 - Manual (Page 171)

Lassen-SK8 Embedded GPS Module C-25
Trimble ASCII Interface Protocol (TAIP)
C.21 TM Time/Date
Data String Format:
AABBCCDDDEEFFGGGGHHIJJKLLLLL
Table C-25. TM Time/Data Data String Descriptions
This message outputs the time and date as computed by the GPS sensor. The time is most
accurate when the unit is doing fixes. It is less accurate but still usable when the unit is not
doing fixes but the Number of Usable SVs is one or more.
*
Note – GPS/UTC Time Offset is the difference between GPS and UTC time standards in
seconds. The UTC time of Day is only valid if the GPS/UTC Offset Valid Flag is indicating
valid.
The TM message is supported under the Set qualifier which allows you to download time
to a GPS receiver that does not have a real-time clock.
Item # of Char UNITS Format (Value)
Hours 2 Hour AA
Minutes 2 Min BB
Seconds 5 Sec CC.DDD
Date; Day 2 Day EE
Date; Month 2 Month FF
Date; Year 4 Year GGGG
GPS/UTC Time
Offset 2 Sec HH
Current Fix Source 1 n/a I 0 = 2D GPS
1 = 3D GPS
2 = 2D DGPS
3 = 3D DGPS
6 = DR
8 = Degraded DR
9 = Unknown
Number of Usable
SVs 2 n/a JJ
GPS/UTC Offset
Flag 1 n/a K (1 = Valid)
(0 = Invalid)
Reserved 5 n/a LLLLL
Total 28