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A-6 Lassen-SK8 Embedded GPS Module
Trimble Standard Interface Protocol
A.5 Warm Start Packets
If the receiver is connected to a back-up power source such as a lithium battery, the data
required to cause a warm start is retained even when main power is turned off. Before
power off, check the following automatic outputs to ensure a warm start will occur on the
next power on cycle:
• The value of Packet 0x4B (byte 1, bit 3) is 0 which indicates that the almanac is
complete and current.
• The position input (0x42,4A, 0x83, 0x84, 0x8F-17, 0x8F-18, 0x8F-20) are correct.
See Table A-4.
• The time in Packet 41 is correct.
• Turning on main power will cause a warm start.
If however you are not supplying the receiver with battery power when main power is off,
you can still warm start the receiver by sending the following commands after the receiver
has completed its internal initialization and has sent Packet 82 (see Table A-5).
Table A-4. Warm Start Packet Commands
INPUT Description
0x2B initial position
0x2E initial time
0x38-02 almanac (for each SV)
0x38-03 almanac health
0x38-04 ionosphere page
0x38-05 UTC correction