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4 OPERATIONAL BASICS
4.1
Operational principals
FM2100 module is designed to acquire records and send them to server. Records
contain GPS and I/O information. Module uses GPS receiver to acquire GPS data and is
powered with 3 data acquire methods: time-based, distance-based, angle-based methods.
Method's details are described in GPS section. All data is stored in flash memory and later
can be sent via GPRS or SMS channels. GPRS mode is most preferred data sending mode.
SMS mode is mostly used in areas without GPRS coverage or GPRS usage is too expensive.
GPRS and SMS settings are described in GPRS section. FM2100 communicates with
server using special data protocol. Data protocol is described in "FM4 Protocols" document.
FM2100 can be managed by SMS commands. SMS Command list is described in SMS
COMMAND LIST
section.
Configuration parameters and modes are described in "FM4 Protocols" document.
4.2
Sleep mode
FM2 can enter sleep mode (standby mode) under two conditions:
• FM2 does not detect movement.
• FM2 does not send or receive any data for 5 minutes. This means that if coordinate
recording interval is more frequent than 5 minutes, FM2 will never go to sleep mode.
FM2 can exit sleep mode under three conditions:
• FM2 detects movement.
• FM2 receives any SMS
• FM2 detects status change on any digital input.
While in sleep mode, FM2 sets GPS receiver to sleep mode, therefore it does not
record or send any data. The power usage also decreases allowing to save vehicle battery.
4.3
Virtual odometer
Virtual odometer is used to calculate traveled distance in FM2 as a separate I/O
element. When FM2 detects movement, it starts counting distance using GPS signal: every
second it checks current location and calculates distance between current and previous point.
It keeps adding these intervals until it is time to make a record, then FM2 records its location
and adds odometer value, which is equal to the sum of all distances, measured every second.
When record is made, odometer resets to zero and distance calculation starts all over again.
Note, that FM2 does not measure distance between coordinates, that it records using time,
distance or angle change intervals. Instead it uses virtual points which are established every
second, and calculates distance between them.
Module configuration can be performed over TCP or via SMS.
14
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