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server. FM3622 tries to handle the session as much as possible; it never closes session by itself.
Session can last for hours, days, weeks or session can be closed after every connection in certain
GSM networks – this depends on GSM network provider. GPRS Context Week Time defines
session re-establish schedule if session was closed by network. New GPRS context is opened if
time is 10 minutes till time checked in table. Therefore if all boxes are checked, FM3622 is able to
open new connection anytime. At scheduled time match FM3622 checks for GPRS session
activity. If GPRS session is alive, FM3622 sends data to server according to Send period
parameter. If it is not, FM3622 checks if it is able to re-establish the session.
Figure 28. GPRS Week Time configuration
Device checks if the time between last saved record and current time is equal or higher
than Time based acquire interval. If so, FM3622 saves record to memory. If not, FM3622 checks
if the distance from last record to current record is equal or higher than Distance based acquire
interval. If so, saves the record to memory. If not and speed is higher than 10km/h, then FM3622
checks if angle difference between last record and current record is equal or higher than Angle
based acquire value. If so, saves the record to memory. These checks are performed every
second.
Note: Keep in mind that FM3622 operates in GMT:0 time zone, without
daylight saving.
FM3622 is able to collect records using four methods at the same time: time, distance, angle and
speed based data acquisition:
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