Rockwell V.32/V.32bis AT Command Set Reference
Revision Date : 27 Dec 95

Basic AT Commands

A/ Repeat Last Command

A Answer

Bn CCITT or Bell Modulation
B0 Selects CCITT operation at 300 or 1200 bps
B1 Selects BELL operation at 300 or 1200 bps (Default)

Dn Dial
Punctuation characters may be used for clarity, with parentheses, hyphen, and spaces being ignored
0-9 DTMF digits 0 to 9
* The "star" digit (tone only)
# The "gate" digit (tone only)
A-D DTMF digits A, B, C, & D
L Re-dial last number
P Select pulse dialing
T Select tone dialing
R Wait 10 seconds after dialing then go into answer mode; must be at end
S=n Dial number stored in directory (n = 0 to 19). (See &Z)
! Flash
W Wait for dial tone
@ Wait for 5 sec silence
, Dial pause (see S8)
; Return to command state; must be at end
^ Enable calling tone
> Grounding pulse

En Command Echo
E0 Disables command echo.
E1 Enables command echo. (Default)

Fn Select Line Modulation
F0 Selects auto-detect mode (Default)
F1 Selects V.21 or Bell 103 according to the "B" setting
F3 Selects V.23 as the only acceptable line modulation for a subsequent connection. Originator is at 75 bps and answerer is at 1200 bps
F4 Selects V.22 1200 bps or Bell 212A according to "B"
F5 Selects V.22bis as the only acceptable line modulation
F6 Select V.32bis 4800 bps or V.32 4800 bps as the only acceptable line modulation
F7 Selects V.32bis 7200 bps as only acceptable modulation
F8 Selects V.32bis 9600 bps or V.32 9600 bps as the only acceptable line modulation
F9 Selects V.32bis 12000 bps as only acceptable modulation
F10 Selects V.32bis 14400 bps as only acceptable

Hn Disconnect (Hangup)
H0 Release line if on-line
H1 If on-hook, go off-hook and enter command mode for period of time determined by S7

In Identification
I0 Reports product code.
I1 Reports ROM checksum
I2 Responds OK
I3 Reports firmware revision
I4 Reports modem identifier
Mfr=U. S. Robotics
CmdSet=Pilot1
Mod=V.32bis
Fax=1, 2
EC/DC=V.42bis, MNP5
I5 Reports Country Code
I6 Reports modem data pump model and internal code revision

Ln Speaker Volume
L0 No real control
L1 (the actual default)
L2 no matter which of
L3 these is selected

Mn Speaker Control
M0 Speaker is always off.
M1 On during call establishment, but off when receiving carrier. (Default)
M2 Speaker always on.
M3 Speaker off when receiving carrier and during dialing, but on during answering

Nn Automode Enable
N0 Detection disabled
N1 Detection enabled (same as F0) (Default)

On Return to OnLine Data Mode
O0 Enters without a retrain
O1 Enters with a retrain

P Set Pulse Dial Default

Qn Quiet Results Codes Control
Q0 Enables result codes to the DTE. (Default)
Q1 Disables result codes

Sn Read/Write S Registers:
n=v Sets S Register "n" to the value "v"
n? Reports the value of S Register "n"

T Set Tone Dial (Default)

Vn Result Code Form
V0 Enables terse result codes. Line feed is not issued
V1 Verbose result codes. (Default)

Wn Error Correction Message Control
W0 Upon connection, the modem reports only the DTE speed (e.g, CONNECT 9600)
W1 Upon connection, the modem reports the line speed, the error correction protocol, and the DTE speed, respectively
W2 Upon connection, the modem reports the DCE speed (e.g, CONNECT 2400) (Default)

Xn Extended Result Codes
X0 Disables BUSY, NO DIALTONE, & CONNECT speed
X1 Disables BUSY & NO DIALTONE
X2 Disables BUSY
X3 Disables NO DIALTONE
X4 Send all messages (Default)

Yn Long Space Disconnect
Y0 Disabled (Default)
Y1 Enabled

Zn Soft Reset & Restore Profile
Z0 Soft reset and restore stored profile 0.
Z1 Soft reset and restore stored profile 1.

AT& COMMANDS:

&Cn RLSD (DCD) Option
&C0 RLSD remains ON at all times
&C1 RLSD follows the state of the carrier (Default)

&Dn DTR Option
&D0 DTR drop is interpreted according to the current &Q setting as follows
&Q0,5,6 DTR is ignored (assumed ON). Allows operation with DTE's which don't provide DTR.
&Q1,4 DTR drop causes the modem to hang up. Auto-answer is not affected.
&Q2,3 DTR drop causes the modem to hang up. Auto-answer is inhibited.
&D1 DTR drop is interpreted according to the current &Q setting as follows:
&Q0,1,4,5,6 DTR drop is interpreted by the modem as if the asynchronous escape sequence had been entered. The modem returns to asynchronous command state without disconnecting.
&Q2,3 DTR drop causes the modem to hang up. Auto-answer is inhibited.
&D2 DTR drop is interpreted according to the current &Q setting as follows: (Default)
&Q0..6 DTR drop causes the modem to hang up. Auto-answer is inhibited.
&D3 DTR drop is interpreted according to the current &Q setting as follows:
&Q0,1,4,5,6 DTR drop causes the modem to perform a soft reset as if the "Z" command were received. The &Y setting determines which profile is loaded.
&Q2,3 DTR drop causes the modem to hang up. Auto-answer is inhibited.

&Fn Restore Factory Configuration (Profile)
&F0 Restore factory configuration 0
&F1 Restore factory configuration 1

&Gn Select Guard Tone
&G0 Disables Guard Tone. Default.
&G1 Disables Guard Tone.
&G2 Selects 1800 Hz guard tone.

&Kn Flow Control
&K0 Disables flow control.
&K3 Enables RTS/CTS flow control. (default for data modem modes)
&K4 Enables XON/XOFF flow control.
&K5 Enables transparent XON/XOFF flow control.
&K6 Enables both RTS/CTS and XON/XOFF flow control.

&Mn Asynchronous Mode Selection
&M0 Selects direct asynch operation (See &Q)

&Qn Sync/Async Mode
&Q0 Selects direct asynchronous operation (See &M0)
&Q4 Select AutoSync operation. AutoSync operation, when used in conjunction with the Hayes Synchronous Interface (HSI) capability in the DTE, provides synchronous communication capability from an asynchronous terminal
Starting AutoSync. Set registers S19, S20, and S25 to the desired values before selecting AutoSync operation with &Q4. After the CONNECT message is issued, the modem waits the period of time specified by S25 before examining DTR. If DTR is on, the modem enters the synchronous operating state; if DTR is off, the modem terminates the line connection and returns to the asynchronous command state.
Stopping AutoSync. AutoSync operation is stopped upon loss of carrier or the ON-to-OFF transition of DTR.
&Q5 The modem will try to negotiate an error-corrected link. Default
&Q6 Selects asynchronous operation in normal mode (speed buffering).

&Rn RTS/CTS Option
&R0 In sync mode, CTS tracks the state of RTS; the RTS-to-CTS delay is defined by S26. In Async mode, CTS acts according to V.25bis handshake.
&R1 In sync mode, CTS is always ON (RTS transitions are ignored). In Async, CTS will drop only if required by flow control. Default.

&Sn DSR Override
&S0 DSR will remain ON at all times. Default
&S1 DSR will become active after answer tone has been detected and inactive after the carrier has been lost.

&Tn Test and Diagnostics

&V Display Current Configuration and Stored Profiles

&Wn Store Current Configuration
&W0 Store the current configuration as profile 0.
&W1 Store the current configuration as profile 1.

&Yn Designate a Default Reset Profile
&Y0 The modem will use profile 0.
&Y1 The modem will use profile 1.

&Zn=x Store Telephone Number
&Zn=x (n = 0 to 3, and x = dial string) (requires 256-byte NVRAM)

AT% COMMANDS:

%C - Enable/Disable Data Compression:
%C0 Disables compression.
%C1 Enables MNP 5 data compression negotiation.
%C2 Enables V.42bis data compression
%C3 Enables both V.42bis and MNP 5 data compression. Default

%En Enable/Disable Line Quality Monitor & Auto-Retrain Fallback/Fall Forward:
%E0 Disable line quality monitor and auto-retrain. Default.
%E1 Enable line quality monitor and auto-retrain.
%E2 Enable line quality monitor and fallback/fall forward.
%E3 Enable line quality monitor and auto-retrain, but hang-up immediately when EQM reaches hang-up threshold. AKA Fast Hangup.

%L-Line Signal Level:

%Q - Line Signal Quality:

%TTn - PTT Testing Utilities:

AT\ COMMANDS:

\An - Select Maximum MNP Block Size:
\A0 64 characters
\A1 128 characters Default
\A2 192 characters
\A3 256 characters

\Bn - Transmit Break to Remote:
\B1-\B9 Break length in 100 mS units. (default = 3) (Non-error corrected mode only)

\Ln - MNP Block/Stream Mode Select:
\L0 Use stream mode for MNP connection. Default
\L1 Use interactive block mode for MNP connection. This command will accept block mode but implement stream mode.

\Gn - Modem-to-Modem Flow Control (XON/XOFF):
\G0 Disables modem-to-modem XON/XOFF flow control. Default
\G1 Enables modem-to-modem XON/XOFF flow control.

\Kn - Break Control:

\Nn - Operating Mode:
\N0 Selects normal speed buffered mode (disables error-correction mode) (Forces &Q6)
\N1 Serial interface selected - selects direct mode and is equivalent to &M0, &Q0 mode of operation. (forces &Q0) Parallel interface selected - Same as \N0.
\N2 Selects reliable (error-correction) mode. The modem will first attempt an LAPM connection and then an MNP connection. Failure to make a reliable connection results in the modem hanging up.
\N3 Selects auto reliable mode. This operates the same as \N2 except failure results in the modem falling back to the speed buffered normal mode. Default
\N4 Selects LAPM error-correction mode. Failure to make a LAPM error-correction connection results in hanging up.
\N5 Selects MNP error-correction mode. Failure to make an MNP error-correction connection results in hanging up.

\S - Report Active Configuration (Not supported on all modems)

S REGISTER SUMMARY:

Register Function Range Units Default
-------- ----------------------------------- ------ ------------ -------
S0 Rings to Auto-Answer 0-255 Rings 0
S1 Ring Counter 0-255 Rings 0
S2 Escape Character 0-255 ASCII 43
S3 Carriage Return Character 0-127 ASCII 13
S4 Line Feed Character 0-127 ASCII 10
S5 Backspace Character 0-255 ASCII 8
S6 Wait Time for Dial Tone 2-255 seconds 2
S7 Wait for Carrier 1-255 seconds 50
S8 Pause Time for (,) Comma 0-255 seconds 2
S9 Carrier Detect Response Time 1-255 1/10 sec 6
S10 Carrier Loss Disconnect Time 1-255 1/10 sec 14
S11 Touch Tone (DTMF) Duration 50-255 1/1000 sec 95
S12 Escape Code Guard Time 0-255 2/100sec 50
S14 General Bit Mapped Options 138 (8ah)
S16 Test Mode Bit Mapped Options (&T) 0
S18 Test Timer 0-255 seconds 0
S21 V.24/General Bit Mapped Options-- 52
S22 Speaker/Results Bit Mapped Options-- 117 (75h)
S23 General Bit Mapped Options-- 54
S24 Sleep Inactivity Timer 0-255 seconds 0
S25 Delay to DTR off 0-255 1/100 sec 5
S26 RTS-to-CTS Delay 0-255 1/100 sec 1
S27 General Bit Mapped Options-- 73 (49h)
S28 General Bit Mapped Options-- 0
S29 Flash Dial Modifier Time 0-255 10 ms 70
S30 Disconnect Activity Timer 0-255 10 sec 0
S31 General Bit Mapped Options-- 202
S32 XON Character 0-255 ASCII 17 (11h)
S33 XOFF Character 0-255 ASCII 19 (13h)
S36 LAPM Failure Control-- 7
S37 Line Connection Speed-- 0
S38 Delay Before Forced Hangup 0-255 seconds 20
S39 Flow Control-- 3
S40 General Bit Mapped Options-- 104
S41 General Bit Mapped Options-- 195
S46 Data Compression Control-- 138
S48 V.42 Negotiation Control-- 7
S82 LAPM Break Control-- 128 (40h)
S86 Call Failure Reason Code 0-255
S86=0 Normal disconnect, no error occurred.
S86=4 Loss of carrier.
S86=5 V.42 negotiation failed to detect an error-correction modem at the other end.
S86=6 No response to feature negotiation.
S86=7 This modem is asynchronous only; the other modem is synchronous only.
S86=8 No framing technique in common.
S86=9 The modems could not find a common protocol.
S86=10 Bad response to feature negotiation.
S86=11 No sync information from remote modem.
S86=12 Normal disconnect initiated by the remote modem.
S86=13 Remote modem does not respond after 10 re-transmissions of the same message.
S86=14 Protocol violation.
S91 PSTN Transmit Attenuation Level l0-15 dBm 9
S92 Fax Transmit Attenuation Level l0-15 dBm 10
S95 Result Code Messages Control-- 0
S201 Cellular Transmit Level l0-63 50
S202 Remote Access Escape Character 0-255 ASCII 0

Copyright US Robotics Mobile Communications Corp. All other product names are trademarks or registered trademarks of their respective holders in the United States and/or in other countries.

Items in bold typeface represent changes from the original US Robotics rck-v32.txt file to reflect the actual factory defaults of the Pilot Modem. Other changes were intended to be simple abridgments for brevity or deletions due to non-applicability.