Specifications

AT command set for S45 Siemens mobile phones and modems
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Siemens Document No.: A30880-A10-A001-3-D376
Revision: 1.8
Revision Date: 30. November.2001
15
\Q<n
Local flow control selection (DTE ↔ DCE); can be customized
<n> can take one of the following values:
0
Disable flow control
1
XON-XOFF software flow control
2
CTS only flow control
3
RTS/CTS flow control
\V[n] Modem command
0
No /REL or /RLP appendix with the CONNECT message
1
/REL or /RLP appendix with the CONNECT message
Table 2-6: Commands supported according to Hayes standard
2.2.2 Command combinations to be avoided
It is possible to specify more than a single command in the command line at any one time; however, not all
command combinations will have the expected result. To ensure that responses to commands will be displayed in
the order expected, the following command combinations should be avoided:
• V25ter commands combined with FAX commands
• GSM 7.07 commands combined with Siemens-specific commands
• GSM 7.05 commands (SMS) specified stand-alone
2.3 AT commands and responses according to GSM 07.07 and GSM 07.05
According to GSM, it is possible to execute an AT command in various forms, as follows:
Test command AT+CXXX=? The mobile phone or modem responds by sending the list of
parameters and value ranges; these can be set using the
corresponding Write command or by means of internal processes
Read command AT+CXXX? This command displays the current value setting of the
parameter(s).
Write command AT+CXXX=<...> This command is used to set parameters that can be set.
Execute command AT+CXXX This command reads non-settable parameters which are
influenced by internal processes in the mobile phone or modem
Table 2-7: Conventions applying to the presentation of AT commands
2.3.1 General commands according to GSM 07.07
This section provides the descriptions of general GSM 07.07 commands.
2.3.1.1 ATO
ATO Return to online data state
Execute command
ATO
Response
CONNECT/ NO CARRIER/ERROR