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Serial Programming: Introduction and OSI Network Model -- RS-232 Wiring and Connections -- Typical RS232 Hardware Configuration -- 8250 UART -- DOS -- MAX232 Driver/Receiver Family -- TAPI Communications In Windows -- Linux and Unix -- Java -- Hayes-compatible Modems and AT Commands -- Universal Serial Bus (USB) -- Forming Data Packets -- Error Correction Methods -- Two Way Communication -- Packet Recovery Methods -- Serial Data Networks -- Practical Application Development -- IP Over Serial Connections
This module explains the AT commands N to Z as used by a "generic" Hayes-compatible modem. Different modems use slightly different commands. However, this list is supposed to be as "generic" as possible, and should not be extended with modem-specific commands. Instead it is recommended to provide such command lists in an Appendix.
Syntax:
N[0|1]
Description:
Controls whether during the handshake it is acceptable to fall back to a lower connection speed than specified by the S37 register. N0 indicates that fall back is not acceptable, N1 indicates that fall back is acceptable.
Result Codes:
Result Codes Code Description OK Parameter was valid ERROR OtherwiseRelated Commands and Registers:
Command Description Template
Syntax:
<The syntax of the command, when necessary in EBNF>
Description:
Return a modem to data mode when it is on line and in command mode.
Result Codes:
Result Codes Code Description OK Parameter was valid <description of success> ERROR Otherwise <description of failure>Related Commands and Registers:
Syntax:
P
Description:
Sets the default dialing method to pulse (rotary) dialing. The setting is valid until it is either changed by using the T command, or a T modifier with the D command.
Result Codes:
Result Codes Code Description OK Parameter was validRelated Commands and Registers:
Syntax:
Q[0|1]
Description:
The command allows to configure if result codes are supposed to be send to the DTE or not.
or
Result Codes:
Result codes are only send if the option is turned on.
Result Codes Code Description OK Parameter was valid ERROR OtherwiseRelated Commands and Registers:'
This page or section is an undeveloped draft or outline.Command Description Template
Syntax:
<The syntax of the command, when necessary in EBNF>
Description:
<Description of the command, including information about the purpose and effects>
Result Codes:
Result Codes Code Description OK Parameter was valid <description of success> ERROR Otherwise <description of failure>Related Commands and Registers:
Command Description Template
Syntax:
<The syntax of the command, when necessary in EBNF>
Description:
<Description of the command, including information about the purpose and effects>
Result Codes:
Result Codes Code Description OK Parameter was valid <description of success> ERROR Otherwise <description of failure>Related Commands and Registers:
Syntax:
T
Description:
Sets the default dialing method to tone (DTFM) dialing. The setting is valid until it is either changed by using the P command, or a P modifier with the D command.
Result Codes:
Result Codes Code Description OK Parameter was validRelated Commands and Registers:
Syntax:
V[0|1]
Description:
Sets result code format to words or digits:
or
1)
CONNECT)
Result Codes:
Result Codes Code Description OK Parameter was valid ERROR OtherwiseRelated Commands and Registers:
Syntax:
W[0|1|2]
Description:
The command controls the contents and format of the CONNECT message:
or
CONNECT message. The speed is reported only once, upon initial set up of the connection. Subsequent reports are disabled.
CONNECT message. The data is reported only once, upon initial set up of the connection. Subsequent reports are disabled.
Result Codes:
Result Codes Code Description OK if parameter was valid (0, 1, 2) ERROR Otherwise.Related Commands and Registers:'
Syntax:
X[0|1|2|3|4]
Description:
The command governs the type and verbosity of connect message responses. If the modem is in facsimile mode (+FCLASS=1), the only message sent to indicate a connection is CONNECT without a speed indication.
or
where xxxx = DTE rate or DCE rate.
Note that the connect message response is a function of Wn, Xn and \Vn.
Result Codes:
Related Commands and Registers:
This page or section is an undeveloped draft or outline.Command Description Template
Syntax:
<The syntax of the command, when necessary in EBNF>
Description:
<Description of the command, including information about the purpose and effects>
Result Codes:
Result Codes Code Description OK Parameter was valid <description of success> ERROR Otherwise <description of failure>Related Commands and Registers:
Syntax:
Z (common) Z[0|1|2|3] (US Robotics)
Description:
Soft reset is started. If modem is connected, connection is dropped. Last saved profile is loaded from NVRAM to RAM. No more commands are read from the command line.
Result Codes:
Result Codes Code Description OK Soft reset succeeded. ERROR Command failed.Related Commands and Registers:
Serial Programming: Introduction and OSI Network Model -- RS-232 Wiring and Connections -- Typical RS232 Hardware Configuration -- 8250 UART -- DOS -- MAX232 Driver/Receiver Family -- TAPI Communications In Windows -- Linux and Unix -- Java -- Hayes-compatible Modems and AT Commands -- Universal Serial Bus (USB) -- Forming Data Packets -- Error Correction Methods -- Two Way Communication -- Packet Recovery Methods -- Serial Data Networks -- Practical Application Development -- IP Over Serial Connections
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