WM_PRJ_M12_UGD_001 - 002
18th September 2003
confidential ©
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4.1.3 Checking the communication with the modem
Connect the RS232 link between the DTE (port COM) and the modem
(DCE).
Configure the RS232 port of the DTE as follows:
- Bits per second: 115.200 kbps,
- Data
bits:
8,
- Parity:
None,
- Stop
bits:
1,
- Flow
control:
Hardware Flow control.
Using a communication software such as Hyperterminal program, enter the
AT
↵
command. The response of the modem must be
OK displayed in the
Hyperterminal window.
If the communication cannot be established with the modem, do the
following:
- Check the RS232 connection between the DTE and the modem (DCE),
- Check the configuration of the port COM used on the DTE.
Example of AT commands which can be used after getting started the
modem:
-
AT+CGMI: modem answer is “WAVECOM MODEM” when serial link is
OK.
-
AT+CPIN=<Pin Code>: to enter a PIN code (if activated).
-
AT+CSQ: to verify the received signal strength.
-
AT+CREG?: to verify the registration of the modem on the network.
-
ATD<phone number>;: to initiate a call.
-
ATH: to hang up (end of call).
For further information about these AT commands and their associated
parameters, refer to document [1].
4.1.4 Resetting the modem
For resetting the modem, a hardware reset signal is available on pin 14 of the
Sub HD 15-pin connector (RESET).
The reset of the modem is carried out when this pin is low for at least 500
µ
s.
For further details about the reset of the modem, refer to paragraph 2.3.
