Hayes Modem Command Summary Faxback Doc. # 5045
+++ Escape Sequence
Use to enter command mode from on-line mode. Wait
at least 1 second before and after the (+++).
A/ Repeat Last Command String
Reexecute the command line stored in the command buffer.
A/ should be the only command entered on a command line.
If a Dial command results in a busy signal, use A/ to
redial the number. Note that "AT" and the terminating
{CR} are not required for this command.
ATA Manual Answer
Causes the modem to answer an incoming call when in the
manual answer mode.
ATB0 CCITT V.22 Protocol
Operates modem with the V.22 international data
communications protocol. This protocol may be used at
1200 bps only.
ATB1 Bell 103/212A Protocol
Operates modem in Bell 103 (0-300bps) and 212A (1200bps)
mode. 0-300bps operation always requires Bell Protocol. ATC0
Carrier Signal Off Disables Carrier Signal; carrier remains off
until the ATC1 or ATZ (reset) command is issued.
ATC1 Carrier Signal ON
Restores automatic carrier signal on/off switching.
When modem originates or answers a call, or is
connected to another modem, the carrier signal remains
on.
ATD Dial
Originates a call. Dial modifiers are added to the
Dial command to tell the modem what, when, and how
to dial.
ATE0 Echo Off(command mode)
Disables character echo (display) in command mode.
Use ATE0 when what you type appears double.
ATE1 Echo ON(command mode)
Restores character echo in command mode. Use ATE1
When commands you type are not displayed.
ATF0 Echo ON(on-line mode)
Restores character echo of what is typed while on-line.
Use ATF0 when data transmitted to a remote terminal is
not displayed on your screen.
ATF1 Echo OFF(on-line mode)
Disables echo of what is typed while on-line. Use
ATF1 when data transmitted to a remote terminal
appears double on your screen.
ATH0 On-Hook
Controls switch hook relay. Enter ATH0 to go "on-hook"
(hang up) from a remote modem connection.
ATH1 Off-Hook
Controls switch hook relay. Causes the modem to go
"off hook".
ATI0 Product ID. Returns modem's product ID code.
ATI1 Checksum
Returns modem's ROM checksum.
ATI2 Internal Memory Check
Test modem's internal memory; returns OK result code
if memory is functioning; returns ERROR result code
if not.
ATL1 Adjust Modem Speaker to LOW volume.
ATL2 Adjust Modem Speaker to MEDIUM volume.
ATL3 Adjust Modem Speaker to HIGH volume.
ATM0 Turns Modem Speaker OFF.
ATM1 Modem Speaker Stays ON Until Carrier Detected.
ATM2 Modem Speaker Always ON.
ATO0 Returns modem to online mode after the Escape Sequence (+++)
was used to enter the command mode.
ATO1 Remote Digital Loopback OFF
Turns OFF loopback function and returns modem on-line.
ATO2 Remote Digital Loopback ON
Request remote digital loopback and returns modem
on-line. Remote digital loopback test the integrity
of the modem and the phone line.
ATP Pulse Dial
Instructs modem to pulse dial all subsequent dial
strings, unless overridden with a subsequent command
string containing the T (touch-tone) dial modifier/
command.
ATQ0 Result Codes ON
Enables Result codes.
ATQ1 Result Codes OFF
Disables result codes.
ATSr Register Pointer
Sets pointer to the address of a specific register.
The pointer remains set until a subsequent ATSr
command is issued. The value of the designated
register can be read or changed without specifying
the register (e.g., if ATS7 is specified, type AT?
to read the value of S7; type AT=n to change the
value of S7).
ATSr? Reads the current value of designated register.
(r=register)
ATSr=n Changes the value of the designated register.
(r=register; n=value)
ATT Touch Tone Dial
Instructs modem to use touch-tone (DTMF) dialing for
all subsequent dial strings, unless overridden with
a subsequent command string containing P.
ATV0 Numeric Result Codes
Result codes returned as numbers (0-8) followed by a
carriage return.
ATV1 Word Result Codes
Returns codes as words, followed by a carriage return
{CR} and line feed {LF}. Registers S3 and S4 control
the ASCII values of the {CR} and {LF} characters.
ATX0 Basic Result Code Set (0-4)
ATX1 Extended Result Code Set (0-5)
ATX2 Detect Dial Tone
Enables dial tone detection at 0-300 or 1200bps;
enables extended result code set 0-6. Modem disconnects
if dial tone not detected.
ATX3 Detect Busy Signal
Enables busy signal detection at 0-300 or 1200bps;
enables extended result code set 0-5,7. Modem
disconnects if busy signal detected.
ATX4 Detect Dial Tone and Busy Signal
Enables modem to detect dial tones and busy signals;
enables extended result code set 0-7.
NOTE* Result code 8, NO ANSWER, is not effected by any ATX command.
Result code 8 is enabled only when the @ dial modifier is placed
in a dialing string.
ATY0 Disable Break
Prevents modem from sending or responding to break
(long space) signals.
ATY1 Enable Break
Enables modem to send and respond to break signals.
Causes modem to send a 4 second break signal before
disconnecting, and to disconnect when it receives 1.6
seconds of break signal.
ATZ Software Reset
Rests modem, restores all modem defaults, and clears
the command buffer. ATZ is entered by itself on the
command line, because it prevents other commands on
the same command line from being executed.
Dial Modifiers
012345 Digits and symbols recognized as part of a telephone number.
67890,#,*
A,B,C,D
T Tone
Modem uses touch tone (DTMF) dialing.
P Pulse
Modem uses pulse (rotary) dialing. Pulse is the
default dialing method.
, Pause
Causes modem to pause before dialing (length of
pause determined by register S8; default is 2 ).
W Wait For Dial Tone
Causes modem to wait for a second dial tone before
dialing (wait time determined by register S7)
@ Silence
Causes modem to wait for one or more rings followed
by 5 seconds of silence. Use @ when accessing a
system that does not produce a dial tone.
! Hookflash
Performs the "hookflash" often used in PBX phone
systems. Use ! to perform a PBX function such as
transferring a call.
/ Wait 1/8 sec.
Causes modem to wait 1/8 second before processing the
rest of the Dial command.
; Return to Command
Placed at the end of the Dial command before the
carriage return, causing the modem to immediately
return to the command mode after completing the
dialing string.
R Originate Call in Answer Mode
R must be placed last in a dial string before the
carriage return. Used to dial an originate only
modem, this causes the modem to originate a call in
answer mode.
(smc-09/14/93)