Nokia A032 User Manual page 192

Dialing phase
The Nokia A032 looks for a modem. The
first required indication is that the DTR
(Data terminal ready) signal at the serial
port is active. This tells the Nokia A032
that there is a device connected to the
serial port.
After DSR is detected the Nokia A032
attempts to communicate with the
modem using the industry standard AT
command set.
The Nokia A032 sends a reset command
to the modem and then, optionally,
sends a user-defined initialization string.
The Nokia A032 issues the command to
dial. You should hear the modem dialling
and attempting to connect. If, successful
the modem will notify the Nokia A032
and proceed to the next stage.
186
What happens Possible problems and solutions
Verify that the DSR signal is active by
viewing the Modem Status screen (see
page 19) – the DTR box should be red.
If it is blue ensure that the modem is
powered on; check the cable connecting
the modem to the Nokia A032.
If this step fails, make sure the modem is
in its factory default state. Most modems
automatically adapt to the data rate of
the computer to which they are
attached. If your modem has a fixed data
rate you may need to specify that in
Advanced Internet Access setup (modem)
on page 51.
Most modems do not need an initializa-
tion string. However, if you are having
problems, check the Nokia support site
for more information on this.
If the line is busy or you've specified the
wrong ISP number, the connection will
fail. One possible failure at this point is
that the modem uses an unusual mes-
sage to indicate connection. The last
message received can be seen in the
Modem Status web management screen
(see page 19). It should normally contain
the word "Connected". If not, you may
need to use a special initialization string
to get the correct message.
Nokia A032 Advanced User Guide