User's Manual

9
Chapter 2
HOW IT WORKS IN MODEM MODE
Referring to the flow chart on the next page, the TX/RX and LAN indicators 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 TX/RX and LAN indicators 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 LAN indicator will flash at the time interval of
1 second, waiting for AT commands.
3) Initialization NG
If initialization fails, the TX/RX indicator 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 LAN indicator will flash at the time interval of 0.3
seconds for about 20 seconds.
5) Connected
When in Dial mode (
ATDT), the LAN indicator will be green after successfully
establishing a connection.
6) Data Transmission
When in Dial mode (
ATDT), the TX/RX indicator will flash as long as data transmission
occurs.
7) Download Ready/Downloading
When in Download mode (
AT+DOWNLOAD), the TX/RX and LAN indicators will flash
to indicate the cradle is ready for downloading or downloading is in progress.