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           Hayes AT Command Sets [ (F) = Factory default ]


 CMD  300   1200   2400  2400                 Action
                   Early Current
---------------------------------------------------------------------
 Basic Commands:
 +++   Y      Y      Y     Y     Exit DATA mode and enter COMMAND
                                 mode, default character.

 A/    Y      Y      Y     Y     Reissue command held in modem's
                                 command buffer.

 AT    Y      Y      Y     Y     Precedes all commands to get the
                                 modems attention.

 Dialing Commands:
 !     -      Y      Y     Y     Initiate hookflash, on-hook for 0.5
                                 sec.

 ,     Y      Y      Y     Y     Wait time, S8 value, before dialing
                                 next digit.

 :     Y      Y      Y     Y     Return to the COMMAND mode after
                                 dialing.

 @     -      Y      Y     Y     Wait for 5 sec of silence before
                                 dialing next digit.

 P     Y      Y      Y     Y     Set dialing type to Pulse Dialing.

 R     Y      Y      Y     Y     After dialing enter the ANSWER mode.

 S     -      -      Y     -     Dial number stored in nonvolatile
                                 memory

 Sn    -      -      -     Y     Dial number stored in nonvolatile
                                 memory location n.

 T     Y      Y      Y     Y     Set dialing type to DMTF Dialing.

 W     -      Y      Y     Y     Wait for second dial tone before
                                 dialing next digit.

 Modem Control Commands:
 A     Y      Y      Y     Y     Go Off-hook and enter ANSWER mode,
                                 answer tone in app 2 sec.

 B0    -      Y      Y     Y     Use CCITT V.22 for 1200 bps
                                 operation.

 B1    -      Y (F)  Y (F) Y (F) Use BELL 212a for 1200 bps operation.

 C0    Y      Y      -     -     Disable the transmitter carrier

 C1    Y (F)  Y (F)  -     -     Enable the transmitter carrier

 D     Y      Y      Y     Y     Dial the following phone number.

 E0    Y      Y      Y     Y     Do not ECHO char in the command mode.

 E1    Y (F)  Y (F)  Y (F) Y (F) ECHO characters when in the command
                                 mode.

 F0    Y      Y      -     -     NO echo of character when in DATA
                                 mode

 F1    Y (F)  Y (F)  -     -     Echo character when in DATA mode

 H0    Y      Y      Y     Y     Place modem ON-hook.

 H1    Y      Y      Y     Y     Place modem OFF-hook, line and aux
                                 relays.

 H2    Y      Y      -     -     Place modem OFF-hook, line relay
                                 only.

 I0    -      Y      Y     Y     Check modem ID code

 I1    -      Y      Y     Y     Check modem checksum

 I2    -      Y      Y     Y     Verify modem memory matches checksum

 L0    Pot    Y      Y     Y     Set speaker volume LOW

 L1    Pot    Y      Y     Y     Set speaker volume LOW

 L2    Pot    Y      Y (F) Y (F) Set speaker volume MED

 L3    Pot    Y      Y     Y     Set speaker volume HI

 M0    Y      Y      Y     Y     Speaker set always OFF.

 M1    Y (F)  Y (F)  Y (F) Y (F) Speaker set ON during dialing, line
                                 connect, modem connect.

 M2    Y      Y      Y     Y     Speaker set always ON.

 M3    -      -      Y     Y     Speaker set ON after dial until modem
                                 connect.

 O0    Y      Y      Y     Y     Enter the DATA mode and wait for
                                 carrier.  If a carrier is present
                                 continue ON-LINE.

 O1    -      -      Y     Y     Return to DATA mode and begin the
                                 RETRAIN sequence

 Q0    Y (F)  Y (F)  Y (F) Y (F) Result codes are returned upon
                                 execution of commands.

 Q1    Y      Y      Y     Y     Result codes are NOT returned upon
                                 execution of commands.

 Sr?   Y      Y      Y     Y     Display register r's value

 Sr=n  Y      Y      Y     Y     Set register r to value n

 V0    Y      Y      Y     Y     Display result codes as numberic
                                 digits

 V1    Y (F)  Y (F)  Y (F) Y (F) Display result codes as english text.

 X0    Preset Y      Y     Y     Basic response, blind dial, no busy
                                 detection

 X1    -      Y (F)  Y     Y     Extended response, blind dial, no
                                 busy detection

 X2    -      -      Y     Y     Extended response, dial tone
                                 detection, no busy detection

 X3    -      -      Y     Y     Extended response, blind dialing,
                                 busy detection

 X4    -      -      Y (F) Y (F) Extended response, dial tone
                                 detection, busy detection

 Y0    -      Y (F)  Y (F) Y (F) Disable long space disconnect
                                 operation.

 Y1    -      Y      Y     Y     Enable long space disconnect
                                 operation.

 Z     -      -      Y     -     Reset modem to user configuration
                                 from nonvolatile memory

 Z     Y      Y      -     -     Reset modem

 Zn    -      -      -     Y     Reset modem to user configuration
                                 from nonvolatle memory n

 Extended Commands:
 &C0   DIP    DIP    Y (F) Y (F) Force the Data Carrier Detect line
                                 active, always on.

 &C1   DIP    DIP    Y     Y     Data Carrier Detect line will follow
                                 the incoming carrier.

 &D0   DIP    DIP    Y (F) Y (F) The DTR line is ignored by the modem

 &D1   -      -      Y     Y     When the DTR line toggles the modem
                                 will enter the COMMAND mode.

 &D2   DIP    DIP    Y     Y     When the DTR line toggles the modem
                                 will hang-up, enter the COMMAND mode,
                                 and disable Auto-answer.

 &D3   -      -      Y     Y     When the DTR line toggles the modem
                                 will hang-up, reset the modem, and
                                 enter the COMMAND mode.

 &F    -      -      Y     Y     Set modem to factory defaults

 &G0   -      -      Y     Y     Disable the guard tone operation.

 &G1   -      -      Y     Y     Enable the guard tone, 550 Hz,
                                 operation.

 &G2   -      -      Y     Y     Enable the guard tone, 1800 Hz,
                                 operation.

 &J0   DIP    DIP    Y (F) Y (F) Select jack style RJ-11, RJ-41s,
                                 RJ-45s

 &J1   DIP    DIP    Y     Y     Select jack style RJ-12, RJ-13.

 &L0   -      -      Y (F) Y (F) Set Dial-up phone line operation

 &L1   -      -      Y     Y     Set Leased line operation

 &P0   Preset Preset Y (F) Y (F) Set Make/Break ratio to USA, 39% make
                                 / 61% Break

 &P1   -      -      Y     Y     Set Make/Break ratio to UK, 33% make
                                 / 67% Break

 &S0   DIP    DIP    Y (F) Y (F) DSR always forced active

 &S1   DIP    DIP    Y     Y     DSR active on connection, CCITT
                                 V.22bis

 &Vn   -      -      -     Y     Display active user configuration and
                                 stored phone numbers.

 &W    -      -      Y     -     Store user configuration in
                                 nonvolatile memory

 &Wn   -      -      -     Y     Store user configuration in
                                 nonvolatile memory n

 &Yn   -      -      -     Y     Designate user configuration to use
                                 with hard reset.

 &Zn   -      -      Y     -     Store Phone number, n, in nonvolatile
                                 memory

 &Zn=x -      -      -     Y     Store Phone number, x, in nonvolatile
                                 memory location n

 Test Commands:
 O1    -      Y      -     -     Terminate remote digital loopback

 O2    -      Y      -     -     Request remote digital loopback from
                                 the remote modem.

 S16=0 Y      Y      -     -     End test and return to COMMAND mode.

 S16=1 Y      Y      -     -     Initiate local analog loopback.

 S16=4 -      Y      -     -     Initiate local digital loopback.

 &T0   -      -      Y     Y     End any active test and return to
                                 COMMAND mode

 &T1   -      -      Y     Y     Initiate local analog loopback.

 &T3   -      -      Y     Y     Initiate local digital loopback.

 &T4   -      -      Y     Y     Enable modem granting RMT digital
                                 loopback requests

 &T5   -      -      Y     Y     Disable modem granting RMT digital
                                 loopback requests

 &T6   -      -      Y     Y     Request RMT modem to enter RMT
                                 digital loopback.

 &T7   -      -      Y     Y     Request RMT modem to enter RMT
                                 digital loopback with self test

 &T8   -      -      Y     Y     Initate local analog loopback with
                                 self test.

 (F) Factory default