Siemens XT55 manual Tracking, History function

XT55 AVL Software Instructions User’s Guide Confidential/Preliminary

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mobile

3 Tracking

3.1 History function

When receiving valid GPS protocols, the module XT55 is capable of saving up to 10,000 GPS protocols in its history memory.

When the memory space has been used up, the oldest protocols will automatically be deleted to make space for new incoming data.

Figure 11 shows a logical flow chart, for a better understanding how the module XT55 saves history data.

	Position Fix Filter
No	History enabled
	Yes
No	Fix Position
	enable ?
	Yes
No	X*
	SV solution?
	Yes
No	Time
	>180 sec.?
	Yes
No	Speed
	> 10 Km/h ?
	Yes
	*)	X >= 3;
	Store data on
	Flash memory
	END

Figure 11: History Filter

XT55_avl_ug_V01 Page 13 of 20 15.03.2004