Serial Programming/Modems and AT Commands/Commands N - Z
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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Hayes-compatable Modems and AT Commands References: -- Special AT Commands and Character Sequences -- AT Commands A - M -- AT Commands N - Z -- AT& Commands |
AT Commands N - Z
[edit | edit source]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.
N: Negotiation of Handshake Options
[edit | edit source]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:
| Code | Description |
|---|---|
| OK | Parameter was valid |
| ERROR | Otherwise |
Related Commands and Registers:
- B: Select Communication Standard (in modems that also specify speed via this command)
- S37: Desired DCE Line Speed
O: On-Line Command
[edit | edit source] |
This page or section is an undeveloped draft or outline. You can help to develop the work, or you can ask for assistance in the project room. |
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:
| Code | Description |
|---|---|
| OK | Parameter was valid <description of success> |
| ERROR | Otherwise <description of failure> |
Related Commands and Registers:
- <Link list of related commands and registers>
P: Select Pulse Dialing Method
[edit | edit source]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:
| Code | Description |
|---|---|
| OK | Parameter was valid |
Related Commands and Registers:
Q: Result Code Display Options
[edit | edit source]Syntax:
Q[0|1]
Description:
The command allows to configure if result codes are supposed to be send to the DTE or not.
- Q
or
- Q0
- (default) Result codes are send to the DTE.
- Q1
- No result codes are send (silent mode).
Result Codes:
Result codes are only send if the option is turned on.
| Code | Description |
|---|---|
| OK | Parameter was valid |
| ERROR | Otherwise |
Related Commands and Registers:'
Sr=: Write to an S-Register
[edit | edit source] |
This page or section is an undeveloped draft or outline. You can help to develop the work, or you can ask for assistance in the project room. |
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:
| Code | Description |
|---|---|
| OK | Parameter was valid <description of success> |
| ERROR | Otherwise <description of failure> |
Related Commands and Registers:
- <Link list of related commands and registers>
Sr?: Read an S-Register
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This page or section is an undeveloped draft or outline. You can help to develop the work, or you can ask for assistance in the project room. |
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:
| Code | Description |
|---|---|
| OK | Parameter was valid <description of success> |
| ERROR | Otherwise <description of failure> |
Related Commands and Registers:
- <Link list of related commands and registers>
T: Select Tone Dialing Method
[edit | edit source]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:
| Code | Description |
|---|---|
| OK | Parameter was valid |
Related Commands and Registers:
V: Result Code Format Options
[edit | edit source]Syntax:
V[0|1]
Description:
Sets result code format to words or digits:
- V
or
- V0
- digit responses (e.g.
1) - V1
- (default) word responses (e.g.
CONNECT)
Result Codes:
| Code | Description |
|---|---|
| OK | Parameter was valid |
| ERROR | Otherwise |
Related Commands and Registers:
- #Q: Result Code Display Options to turn on/off the responses.
W: Negotiation Progress Message Selection
[edit | edit source]Syntax:
W[0|1|2]
Description:
The command controls the contents and format of the CONNECT message:
- W
or
- W0
- (default). When connecting, the modem reports the DTE/DCE speed in the
CONNECTmessage. The speed is reported only once, upon initial set up of the connection. Subsequent reports are disabled. - W1
- When connecting, the modem reports the line speed, error correction protocol, and the DTE/DCE speed. The data is reported only once, upon initial set up of the connection. Subsequent reports are disabled.
- W2
- When connecting, the modem reports the line speed in the
CONNECTmessage. The data is reported only once, upon initial set up of the connection. Subsequent reports are disabled.
Result Codes:
| Code | Description |
|---|---|
| OK | if parameter was valid (0, 1, 2) |
| ERROR | Otherwise. |
Related Commands and Registers:'
- #X: Call Progress Options for selecting the details of the reporting message.
- #S31: Bit Mapped Options Status Bits 2-3.
X: Call Progress Options
[edit | edit source]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.
- X
or
- X0
- blind dial, no busy detect, CONNECT.
- X1
- blind dial, no busy detect, CONNECT xxxx.
- X2
- dial tone detect, no busy detect, CONNECT xxxx.
- X3
- blind dial, busy detect, CONNECT xxxx.
- X4
- full monitor, all messages, CONNECT xxxx.
where xxxx = DTE rate or DCE rate.
Note that the connect message response is a function of Wn, Xn and \Vn.
Result Codes:
| Code | Description |
|---|---|
| OK | Parameter was valid (0,1,2,3,4,5) |
| ERROR | Otherwise |
Related Commands and Registers:
Y: Long Space Disconnect Options
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This page or section is an undeveloped draft or outline. You can help to develop the work, or you can ask for assistance in the project room. |
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:
| Code | Description |
|---|---|
| OK | Parameter was valid <description of success> |
| ERROR | Otherwise <description of failure> |
Related Commands and Registers:
- <Link list of related commands and registers>
Z: Soft Reset Command
[edit | edit source]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:
| Code | Description |
|---|---|
| OK | Soft reset succeeded. |
| ERROR | Command failed. |
Related Commands and Registers:
- Serial Programming:Modems and AT Commands/& Commands#&F: load profile from ROM
- Serial Programming:Modems and AT Commands/& Commands#&V: show current profile or profile from NVRAM
- Serial Programming:Modems and AT Commands/& Commands#&W: save current profile to NVRAM
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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Hayes-compatable Modems and AT Commands References: -- Special AT Commands and Character Sequences -- AT Commands A - M -- AT Commands N - Z -- AT& Commands |