GD100Usermanual
TRACGD100UM001 ‐9‐
USB Port    If the battery switch is on, it will work as 
a serial port for configuration. 
  If battery switch is off, it will work as a 
mass storage. 
Note: 
If you want to change work mode of USB, 
you need to reboot the device. 
Toggle Switch    Turn on GD100 when switch to “ON”. 
  Turn off GD100 when switch to “OFF”.
 
2.3. LEDDescription
There are five LEDs on GD100, the description as follows. 
Table2.  GD100LEDDescriptionTable
LED  Device status  LED status 
CELL 
(Green) 
Device is searching GSM network.  Fast flashing   
Device has registered to GSM network.    Slow flashing 
SIM card needs pin code to unlock.  ON 
Receive a valid protocol command.  Keep on for 3 seconds 
GPS 
(Green) 
GPS chip is powered off.  OFF 
GPS sends no data or data format error.  Slow flashing 
GPS chip is searching GPS info.    Fast flashing 
GPS chip has gotten GPS info.  ON 
PWR 
(Green) 
Power on and normal.  ON 
USB is connected for configuration. Fast flashing 
Power low alert  Slow flashing 
TEMP 
(Green & 
Red) 
Temperature is in the normal band.  Green light slow flashing
Temperature bands alarm event is triggered  Red light slow flashing 
Temperature bands alarm function haven’t 
been activated. 
OFF 
DATA 
(Green & 
Red) 
All the messages are sent to server 
successfully. 
Green light slow flashing
Some messages are blocked for sending.  Red light slow flashing 
Before getting the send result of the first 
message. 
OFF 
USB is connected as a mass stroage.  ON 
1‐Fastflashingisabout60msON/780msOFF
2‐Slowflashingisabout60msON/1940msOFF
 
SPECIAL STATUS 
1.  GD100 received RTO command ‘ACT’ from server: TEMP & DATA GREEN lights 
flash two times together and TEMP & DATA RED lights flash one time together in turn. 
2.  GD100 received ‘ACT’ command, and user pressed START Button: All LEDs work