Siemens TC35T GSM Digital Transceiver
10
6.2 Configuration for the GSM Network
The TC35T must be configured to work on the particular network for which its
SIM is valid. These settings will probably have been pre-set by the supplier of
your SIM. If not, refer to details in Appendix C or the Siemens TC35T operator’s
manual with reference to the
AT+CREG
and
AT+COPS
commands.
A summary of the configuration procedure is:
1.
Make sure the modem has been fully reset and then configured to run at 9600
baud as detailed above.
2.
Issue the required commands (see below) either individually or in combination.
3.
Issue the final
AT&W
command to store the set-up in non-volatile memory.
The following commands are required to change the settings from the factory
defaults (please refer to the Siemens TC35T manuals for full details). Enter the
command and then press the return key. Wait for a response before proceeding
with the next command.
AT&F
Reset to factory default settings.
ATX0
Basic connect messages only
(AT&S0
Force DSR high - required only for use with the SC32A or
RAD modems.)
(AT&D0
Ignore DTR. This is only required for, and so should only be
used with, a CR200 series datalogger used with a null modem
cable
or
older dataloggers such as the CR7 and 21X.)
ATS0=1
Set the TC35T to auto-answer incoming calls
ATV0
Numeric result codes –
the TC35T will not respond with ‘OK’
to this or following commands; instead it returns ‘0’ (zero) at
the start of the current line.
AT&W
Saves all of the above settings in non-volatile memory.
To validate all settings are correct, issue the
AT&V
command to display all of the
non-GSM settings on the screen. Make sure the settings are all shown in ‘Active
Profile’.
If you get the response ‘ERROR’ or ‘4’ after entering the
above AT commands, please ensure that the terminal
software is set up to communicate via the COM port to which
the TC35T is connected, and
not
with any internal modem
which may be fitted in the computer.
Also ensure that the TC35T has a valid SIM installed with the
PIN security function unlocked or disabled.
6.3 Base Station
Either a standard desktop modem or the TC35T itself can be configured as a base
station. Details are given in the following sections.
6.3.1 Configuring a Desk-Top Modem as a Base Station
The modem to be used as a base station should first be selected, either by editing
your MODEM.INI file if using the DOS version of the software or by selecting the
correct modem setting in PC208W. With PC208W version 3 onwards, the "default
modem" will work with most modern modems. In some cases, though, particularly
CAUTION
