Further Notes For Converting History Data With Special Remark To Data/Event Logging Features - FALCOM MAMBOII User Manual

C C
ONFIGURATION OMMAND
3.2.4.2.5.2
If a record has „no GPS fix", its position should be ignored for any navigation (the
position is invalid, and if it is a differential record, its relative position will be 0 for dx, dy,
dz). Furthermore, the shown time is no valid GPS time.
This time is usually reliable in the following case:
The device has had a GPS fix after startup. This fix got lost due to bad GPS
coverage.  The internal time stored inside this record is quite accurate (± a few
seconds for a long time span)
This time is not reliable in the following case:
The device has no GPS fix after startup. Only the stored LastValid position (and its
time) could be used to initialize the internal clock.
MAMBOII uses this time (LastValid) and increments it as long as no valid GPS time
available. However, the internal time can be in the past (depending on how
long the device has been switched off after saving the LastValidPosition for the
last time).
History records created with „last valid" times are ordered correctly – so you can
assume which record happened before/after another one in the past ( allows
event /data logging). Furthermore, time differences between single records are
also correctly shown for a session:
In order to distinguish which records belong to a „session" in the past (device
started, wrote history records and was sent to sleep later), you can do two things:
1. Write a record containing special user data right before saving the last valid
position and sending the device to sleep. Whenever, you read out this user
data later, you know when the device was sent to sleep (your session
ended).
2. As a general hint:
probably performs a restart.
-
-
This confidential document is a property of FALCOM and may not be copied or circulated without previous permission.
S - F R
ET IRMWARE
Further notes for converting history data with special remark to data/event
logging features
whenever a new „full record" is written, the device
if there is a time gap between the last differential record and the new
full record, the device has been sent to sleep (this time gap shows how
long the device has been sleeping/shut off)
if there is no time gap in between, the device wasn't sent to sleep,
which means the time differences between all records of this session
are absolutely reliable.
2.4.0_ -
EVISION BETA
V 1.0.0
ERSION
Page 95 of 271