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HOW IT WORKS IN MODEM MODE
Referring to the flow chart on the next page, the LED 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 POWER indicator will start to flash in a few seconds, indicating
the cradle is in initialization process.
2) Initialization OK
If initialization is done successfully, the POWER indicator will become solid, waiting for
AT commands.
3) Initialization NG
If initialization fails, the POWER indicator will keep flashing. 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 READY indicator will start to flash.
5) Connected
When in Dial mode (ATDT), the READY indicator will become solid after successfully
establishing a connection.
6) Data Transmission
When in Dial mode (ATDT), the DATA indicator will flash as long as data transmission
occurs.
7) Download Ready/Downloading
When in Download mode (AT+DOWNLOAD), the POWER and DATA indicators will be
flashing by turns to indicate the cradle is ready or downloading is in progress.
Chapter 2
9
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