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8400 GPRS Cradle 

Reference Manual

 

 

Referring to the flow chart on the next page, LED 2 and LED 3 are used to indicate a 
specific stage of initialization, data connection, as well as firmware download. They are 

explained below (by number). 

1)  Initializing 

After powering on, the LEDs of Tx/Rx and Link will flash by turns at the time interval 
of 0.25 seconds for about 30 seconds, indicating the cradle is in initialization process. 

2)  Initialization OK 

If initialization is done successfully, the LED of Link will flash at the time interval of 1 

second, waiting for AT commands. 

3)  Initialization NG 

If initialization fails, the LED of Tx/Rx will flash at the time interval of 0.5 seconds, 

indicating an error occurs. For example, it might fail to pass PIN authentication, the 
signal strength is weak for the GSM network, the Access Point name is incorrect, etc. 

For details on the specific initialization error, use “

AT+ERR

?” to get the error code. 

Although initialization fails, the cradle can still accept AT commands. In case of the 

“

ATDT

” command, it will re-initialize before dialing out. 

4)  Dialing out 

When  in  Dial  mode  (

ATDT

), the LED of Link will flash at the time interval of 0.3 

seconds for about 20 seconds.   

5)  Connected 

When  in  Dial  mode  (

ATDT

), the LED of Link will be green after successfully 

establishing a connection. 

6)  Data Transmission 

When in Dial mode (

ATDT

), the LED of Tx/Rx will flash as long as data transmission 

occurs. 

7)  Download Ready 

When in Download mode (

AT+DOWNLOAD

), the LEDs of Tx/Rx and Link will flash by 

turns to indicate the cradle is ready. 

8)  Downloading 

When in Download mode (

AT+DOWNLOAD

), the LEDs of Tx/Rx and Link will flash 

simultaneously to indicate downloading is in progress.