ST3500 User Manual
2
1. Introduction
This document describes features, protocols and detail operation of ST3500.
If there is another operation description document for special buyer to customize or model and
the contents of the document is different with this, customizing document should be applied for
special buyer.
2. Overview
Device consists of WCDMA, GPS and event parts.
The main purpose of device reports getting GPS position and other informs of vehicle to server
periodically.
Device can control or check connected lines and support additional functions.
2-1. Operation Mode
The device has 3 operation modes, driving, parking and emergency.
**
Driving
: Driving status when ignition is on.
**
Parking
: Parking status that starts if ignition is off during more than T1.
**
Emergency
: Once panic button is On or any other status as per designed.
The device sends emergency reports until A1 times or receiving server acknowledge.
2-2. Report
AVL reports GPS and some information at predefined interval, depending on the current modes.
Also, AVL sends some alerts, for example, movement at the parking condition, changing of
connected input line and so on.
Device distinguishes all reports with 6 types, Status report, emergency, event, alert, alive and
command response.
Device can store reports when reporting route (For example, WCDMA condition) is not successful.
Storage capacity is up to 2,000 status reports, 50 emergency reports, 50 alert reports (include
event reports) and 1500 bytes as command response. In case of status reports, oldest report is
erased and new report is buffered when the buffer is full and new status report enters (FIFO).
When reporting condition is recovered, device starts sending all buffered reports.
Also, this capacity can increase if it is needed.
Each type of reports has priority, and priority is as below.
Emergency
Command Response
Alert
Status Report
Alive (Lowest)
