User guide

Developers guidelines | AT commands
16 June 2010
Operating in offline command mode
Figure 1. In offline command mode, the built-in modem accepts data as commands
and not as normal communications traffic. You enter commands by typing at the PC/
PDA keyboard.
Switching to online data mode
To enter online data mode, for data to be exchanged with the modem at the other end
of the link, enter the ATD command followed by the telephone number to make the
call. Alternatively, typing ATA to answer an incoming call also places the built-in
modem in online mode.
Switch on
Offline Command Mode
Online Command Mode
Online Data Mode
Exchange AT command data between
computer and built-in modem
Exchange data or facsimile
with a remote modem
Exchange AT command data with the Built-in
Modem while staying online
Lose carrier
or
lose IR link
or
press “NO”
button
(or
pull DTR
low *)
Lose carrier
or
lose IR link
or
press “No”
button
(or pull DTR
low *) or ATH
+++AT <?>
(or pull DTR low *)
Answer
ATA
ATO
Dial
ATD
<tel.no.>
* Pull DTR not available
when using cable.