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 |
