ST3500 User Manual
4
It’s applicable only for models that have external antenna.
- Main Power Checking
The device can recognize the main power and inform to server when main power line is
disconnected or main power drops below preset value.
It’s applicable only for battery model.
- Battery Error Alert
Device can alert about battery error related on charging.
It’s applicable only for battery model.
3. Protocol Construction
All command and reports are string and follows below format.
Every filed is distinguished by semi colon.
All report string from device is ended by ‘
＼
r’ (0x0D).
Command message format (from server to device)
HDR DEV_ID VER Field 1 Field 2 … Field n
Field
Definitions
Remark
HDR
String
“ST3500” + Command type
DEV_ID
6 char.
Device ID of AVL
VER
“02”
Protocol Version. This is fixed with “02”.
Field 1 ~ n
String
Contents
Device ID is unique number of each device that consists of 6digits.
If the command has invalid value or DEV_ID of the command that is sent by WCDMA or SMS is
not matched with DEV_ID of the unit.
Report message format (from device to server)
HDR DEV_ID SW_VER Field 1 Field 2 … Field n
Field
Definitions
Remark
HDR
String
“ST3500” + Report type
