375 lines
14 KiB
Plaintext
375 lines
14 KiB
Plaintext
The following Hayes commands represent industry standards. These
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are included as part of the information we are providing new modem
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ans BBS users as part of Online Training.----Lois Laulicht; ccc of wv
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Introduction
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This chapter describes the AT command set. If you're using
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communication software, you shouldn't have to use AT
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commands. Your modem will be controlled by your
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communications software. However, if you are writing software
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that you want to control the modem, or if you want to
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undderstand the "behind the scenes" operation of the modem,
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you'll want to learn more about the AT command set.
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Major topics discussed in this following section include:
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* Command Execution
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* Command Guidelines
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* AT Immediate Commands
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* AT Set Commands
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* AT Commands for Optional Non-Volatile Memory
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* Sendfax AT Commands
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* S Register Table
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command Execution
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Your modem accepts only ASCII characters (loosely speaking
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the characters on the keyboard) as commands- The commands
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entered while the modem is in command mode are stored in a
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memory buffer that is 40 characters long. Unless the echo
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back is disabled (EO command), these characters will also be
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echoed back to your computer and displayed on the monitor
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screen. Upon seeing a carriage return showing that the
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command is ended, the command is compared to a list of valid
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commands, and if a match is found, the function associated
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with the command is executed.
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A command line must start with the ATtention code AT.
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However, commands may be strung together in a single command
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line. If desired, each command may be separated by a space
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for readability, however the command string may not exceed 40
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characters and spaces. The command or string of commands will
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be executed when you enter a carriage return, and a result
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code is sent back after the last command that is executed in
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the command string. The result codes are displayed on the
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monitor, unless they have been intentionally disabled.
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command Guidelines
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Your modem is easy to operate and configure. However, it is
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very important that certain guidelines for issuing commands
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to the modam are followed.
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If an error was made while entering a command in command
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mode, it can be edited at any time (before pressing the
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return key).Pressing the backspace key delete the last
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character entered. By pressing the backspace key repeatedly,
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the entire command line may be deleted, except for the AT
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command at the beginning of the command line.
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Each command line must end with carriage return. The modem
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does not begin command execution until it receives a carriage
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return.
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A missing parameter in a cammand that requires a parameter tp
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fully define the command (in addition to the command)
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evaluates to zero.
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The command buffer is 40 characters long, If a Command
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exceeds 40 characters, the modem will abort execution of the
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command line and display an error message.
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AT Immediate Commands
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The modem command set consists of two types of commands:
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Immediate Commands and set Commands. The Immediate Commands
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will always use the current default settings, unless the
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command specifies otherwise. The table below lists the
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Immediate commands and their functions.
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AT ImmediateCommands
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COMMAND FUNCTION
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AT Command line prefix. The Attention Command precedes
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all other commands listed below except for A/ and the
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excape code. For example, the command DT would be typed
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ATDT.
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______________________________________________________________
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A/ Repeat the previous command (not to be preceded by AT)
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______________________________________________________________
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A The modem is set to answer mode and goes offhook
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immediately.
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______________________________________________________________
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Dn Dial the number immediately following this command
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where n is the number to be dialed, or that number
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combined with other dial subcommands as shown below.
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Any combination of the subcommands listed below may
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be strung together to perform the desired dialing
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sequance. The number is dialed in the call progress
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or blind mode depending on register S11.
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DIAL FUNCTION
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SUBCOMMAND
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T Touch Tone Dialing.
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P Pulse Dialing.
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(Default to Pulse if T or P not used)
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R Reverse mode. Puts modem in answer mode
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immediately after dialing.
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W Wait for a continuous tone before
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dialing the next number. Useful for dialing
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MCI or Sprint. The modem waits for the
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number of seconds set by the register S7
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for the tone to occur. If the tone is not
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not heard, BUSY or NO DIALTONE result code
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is issued.
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@ Wait for the "quiet answer" - one or more
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rings followed by 5 seconds of silence -
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for the length of time defined by register S7.
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, Pause the length of time specified by register
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S8 (default time = 2 seconds). Each comma
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equals the pause length specified.
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! Flash. This character can be used to go
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temporarily on-hook in order to get a new
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dialtone. (Note: Some software uses ! as a
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carriage return.)
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; Return to the Command state after
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dialing. This command can only be
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placed at the end of a dial command.
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S Dial a stored number. The numbers
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are stored in the registers of the
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microcontroller.
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S=9 Dial stored number 0,1,2,or 3 that has
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been previously stored in non-volatile
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memory using &Zn command (the non-
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volatile memory is an optional feature).
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0-9 # * ABCD Digits and -characters that may be use
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in dialing. il * and ABCO may only be
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used when tone dialing.
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DIAL EXAMPLE 1:ATDTl1234567
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This example instructs the modem to tone
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dial the number 1234567. Bl@nk spaces
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within a command string are ignored.
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DIAL EXAMPLE 2: ATDP9WT4ll,,,,,HO
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This example instructs the modem to
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pulse dial 9, wait for a second
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dialtone; tone dial the number 411,
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pause 10 seconds, and then hang up.
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Hn controls the modem on/off hook relay
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n = 0, on-hook (disconnected) n = 1, off-hook
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In Returns product ID/checksum.
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n = 0, returns product ID.
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n = 1, performs checksum, returns checksum.
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n = 2, performs checksum, returns result code.
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n = 3, returns ROM part # and revision level
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On Puts modem in the online data mode.
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n = 0, online
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n = 1, online with equalizer retrain sequence (2400
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bps only).
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Issuing an 'On' command always takes modem offhook
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Z Causes a software reset with registers set to default
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values.
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&F Sets values for S Registers and commands to factory
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default.
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&Zn Stores telephone numbers to optional non-volatile
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memory. Modem normally comes without non-volatile
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memory.
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AT Set Commands
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Set commands are used to configure the modem, allowing you to
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select operation speeds and standards, result code format
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and various other options. The default confiqurations are
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listed first, and marked with an *.
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COMMAND FUNCTION
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_____________________________________________________________
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Bn Selects V.22 or Bell 212A in the 1200 bps mode.
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*n = 1, Bell 212A with 2225 Hz Answer Back Tone
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n = 0, CCITT V.22 with 2100 Hz Answer Back Tone
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En Determines whether the modem echoes the data received
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in the command mode back to the local computer.
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*n = 1, echo on n = 0, echo off
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Ln Speaker Volume
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*n=2, medium n= 0 or 1, low n = 3, high
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Mn Speaker Control
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*n = 1, speaker on when dialing until carrier detected
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n = 0, speaker off
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n = 2, speaker always on
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n = 3, speaker on after dialing until carrier detected
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Qn Result codes on/off.
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*n = 0, codes are sent n = 1, codes are not sent
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Sr? Reads the contents of status register r.
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Sr=n This command may be used to modify an S Register of
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the modem. It assigns a value n to the status
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register r. They may be reset to the default value
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by issuing an '&F' or 'z' command. See next table
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for @ list of S Registers.
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Vn Sets result code format.
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*n = 1, words n = 0, numeric
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Xn Sets dialing mode, result code format for dial command
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*n = 4, Dialtone and busy signal detected. Result
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codes 0-7 and 10 enabled.
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n = 0, Dialtone and busy signal not recognized (blind
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dialing). Result codes 0-4 enabled.
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n = 1, Dialtone and busy signal not recognized (blind
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dialing). Result codes 0-5 and 10 enabled.
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n = 2, Dialtone detected. Busy signal not detected
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Result codes 0-6 and 10 enabled.
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n = 3, Busy signal detected. Dialtone not detected
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Result codes 0-5,7, and 10 enabled.
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Yn Long Space Disconnect Option
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*n = 0, disabled n = 1, enabled
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Zn Recall configuration profile in non-volatile RAM
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*n = 0, Recall profile 0 (stored using &WO command)
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n = 1, Recall profile 1 (stored using &WI command)
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&Cn Enables DCD.
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*n = 1, DCD set by modem when remote carrier detected.
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n = 0, DCD always on.
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&Dn Enables DTR. DTR on/off time as specified by S25.
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*n = 0, modem ignores DTR.
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n = 1, switches to command mode when DTR goes off.
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n = 2, same as n = 1. Also hangs up, disables auto
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answer.
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n = 3, initializes modem when DTR goes off.
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&Gn Guard Tone (used only whan in CCITT modes)
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*n = 0, noguard tone n = 1, 550Hz n = 2, 1800 Hz
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This command need never be used when communicating
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over U.S. phone lines. Outside the U.S,, the modem
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may need to generate an additional tone, along with
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its carrier, to disable echo suppressors in the
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central office. This guard tone varies by country.
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&Mn Communications Mode
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*n = 0, Asynchronous n = 1, n = 2, n = 3, Reserved
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&Pn Pulse dial make/break ratio.
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*n = 0, 39/61 (for U.S. applications)
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n = 1, 33/67 (for foreign applications)
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&Qn Communications Mode Option
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Idle State On-line State
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*n = 0 Normal Asynchronous
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n = 1 Normal Reserved
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n = 2 Dial when DTR = 1 Reserved
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Hangup when DTR = 0 Reserved
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n = 3 Talk/data, DTR = 0/1 Reserved
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&Sn Controls DSR. DSR ON indicates that the modem is
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connected to a communication channel and is ready.
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*n = 0, DSR is always on
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n = 1, DSR turned on at start of handshaking, off in
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test mode, idle state, or when carrier is lost
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&Tn Controls Test (for n=6,7,8 disabled for 300 bps modes
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*n = 0, Ends current test and returns to command mode
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n = 1, Initiate local analog loopback
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n = 3, Initiate local digital loopback
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n = 4. Grant request to remote mode for RDL.
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n = 5, Deny request from ramote modem for RDL
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n = 6, Initiate ramote digital loopback
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n = 7, Initiate remote digital loopback w/ self test
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n = 8, Initiate local analog loopback w/ self test
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AT Commands for Optional Non-Volatile Memory
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This modem has been designed to accept non-volatile memory
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if required. In general, non-volatile memory is not required
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for modems that are used in PCs, since the configuration that
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would be stored in the non-volatile memory is stored instead
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in the communications software as part of the software setup,
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or as an initialization string or dial string.
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&V Displays active configuration profiles (S Register
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settings, commands, and telephone numbers. Inputs
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from the DTE are ignored while this information is
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being sent.
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@Wn Store Active Profile. Sends and stores acceptable
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values for certain commands and S Registers to non-
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volatile RAM. The following may be stored:
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Commands:Bn,Cn,En,Fn,Ln,Mn,P or T,Qn,Vn,Yn,Xn,&Cn,
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&Dn,&Gn,&Jn,&Ln,&Mn,&Pn,&Qn,&Rn,&Sn,&T4,&T5,&Xn
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Registers:S0,S14,S18,S21,S22,S23,S25,S26,S27
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The last DTE speed and parity are also stored. Stored
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values are used on power-up or hard reset.
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n = 0, Store active profile in location 0
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n = 1, Store active profile in location 1
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&Yn Select Stored Profile on Power Up Option
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n = 0, Select profile 0 on power up or hard reset
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n = 1, Select profile 1 on power up or hard reset
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See the &Wn command for particular commands and S
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Registers stored. The selected &Y command survives a
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power outage
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&Zn=x Store Telephone Number. Stores up to four dialing
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strings in non-volatile RAM for later recall using DS
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(dial stored number) command.
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Command format:
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&Z <up to 36 characters> <CR>
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&Z= <up to 36 characters> <CR>
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&Zn <up to 3G characters> <CR> where n=0 to 3
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If the delimiter (=) is not present, the characters
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following the &Z are treated as telephone numbers
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and/or modifiers and are stored in location 0. If the
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delimiter is present, th@ characters following it are
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stored in the location specified by the character
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preceding the delimiter (0 to 3), If not specified, 0
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will be used.
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Allowable characters: 0 1 2 3 4 5 6 7 8 9 A B C D # *
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T P R W @ , ! ;
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Characters not listed above will be ignored.
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