Card Type	Modem (Asynchronous)
Chip Set	U.S. Robotics
Maximum Data Rate	2400bps
Data Bus	Unidentified
Data Modulation Protocol	Unidentified

ABORT
Type:	Immediate
Format:	Any key
Description:	Aborts answering/originating a call; modem hangs up.

ANSWER
Type:	Immediate
Format:	AT [cmds] A
Description:	Enables answer mode, the modem goes off-hook; pressing any key will abort.

ANSWER SEQUENCE
Type:	Configuration
Format:	AT [cmds] Bn [cmds]
Description:	Selects the answer sequence the modem will use
Command	Function
B0	ITU-T answer sequence enabled
í B1	Bell answer sequence enabled

ATTENTION
Type:	Immediate
Format:	AT [cmds]
Description:	Tells the modem that a command follows or use alone to test OK result code

BIT-MAPPED REGISTER S13
Format		AT [cmds] S13=n [cmds]
Default:		0
Range:		0-222
Unit:		Bit-mapped
Description:		Controls auto-answer, result code pause, DTR dialing, reset dialing, MNP3 and hardware reset.
Bit	Value	Function
0	í 0	Not used
1	í 0 1	Auto-answer mode disabled Auto-answer mode on originate enabled
2	í 0 1	Result code pause enabled Result code pause disabled
3	í 0 1	DTR dialing disabled DTR dialing enabled
4	í 0 1	Reset dialing disabled Reset dialing enabled, dials number at position 0 in NVRAM.
5	í 0	Not used
6	í 0 1	MNP 3 enabled MNP 3 disabled
7	í 0 1	Hardware reset disabled Hardware reset enabled

BIT-MAPPED REGISTER S15
Format		AT [cmds] S15=n [cmds]
Default:		0
Range:		0-81
Unit:		Bit-mapped
Description:		Controls escape sequence, MNP4, and MNP compliance.
Bit	Value	Function
0	í 0 1	Normal operation Hang up on receiving +++
1 - 3	í 000	Not used
4	í 0 1	MNP 4 enabled MNP 4 disabled
5	í 0	Not used
6	í 0 1	MNP normal MNP adjusted for non compliant modems

BREAK TYPE
Type:	Configuration
Format:	AT [cmds] &Yn [cmds]
Description:	Configures action of break signal
Command	Function
&Y0	Empty buffer only
í &Y1	Empties buffer and break is sent immediately
&Y2	Do not empty buffer and break is sent immediately
&Y3	Do not empty buffer or send break

CARRIER DETECT (CD)
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Description:	Controls the CD signal
Command	Function
&C0	Modem does not respond to CD signal
í &C1	CD signal normal

CARRIER FAILURE CODES
Type:	Register
Format:	AT [cmds] S20=n [cmds]
Description:	Reports codes which correspond to the possible causes of NO CARRIER
Value		Meaning
0		Ant key abort
1		DTR dropped
2		Escape sequence
3		Loss of carrier
4		Inactivity time-out
5		ARQ connection not established, hang-up.
6		ARQ retry time-out
7		Receive link disconnect

COMPRESSION
Type:	Configuration
Format:	AT [cmds] &Kn [cmds]
Description:	Selects data compression
Command	Function
&K0	Data compression disabled
í &K1	Auto enabled/disable data compression
&K2	Data compression enabled

CONNECTION FAILURE CODES
Type:	Register
Format:	AT [cmds] S17=n [cmds]
Default:	0
Description:	Reports codes which correspond to the possible causes of a connection failure

CONNECTION SPEED
Type:	Configuration
Format:	AT [cmds] &Nn [cmds]
Description:	Sets connection speed, modem will hang up if it cannot connect.
Command	Function
í &N0	Normal link
&N1	300bps
&N2	1200bps
&N3	2400bps

DATA TERMINAL READY (DTR)
Type:	Configuration
Format:	AT [cmds] &Dn [cmds]
Description:	Selects modem response to DTR
Command	Function
í &D0	Modem does not respond to DTR
&D1	Modem goes to command mode after DTR toggles
&D2	Modem is initialized after DTR goes off

DIAL
Type:	Immediate
Format:	AT [cmds] D<#> [cmds]
Example:	ATDT 443-3388,,,1111;
Description:	Dials telephone number according to any modifiers included in the string
Note:	Any combination of modifiers can be used to produce the desired dial functions in sequence.
Command	Function
í P	Pulse dialing enabled
T	Tone dialing enabled
,	Dialing paused for 2 seconds to a maximum amount of time specified in S8 register
;	Modem returned to command state after dialing. Can only be placed at the end of the dial command.
"	Dials letters that follow, ATDT"GOMICRO
!	Flash function initiated
W	Dialing resumed following dial tone detection
@	Wait for quiet answer, then proceeds to execute the rest of the dial string.
R	Answer mode enabled; originate mode disabled following handshake initiation.

DIAL - STORED NUMBER
Type:	Immediate
Format:	AT [cmds] DSn [cmds]
Description:	Dial stored number from memory location n

ECHO
Type:	Configuration
Format:	AT [cmds] En [cmds]
Description:	Controls echo function; display keyboard commands when enabled.
Command	Function
E0	Echo function disabled
í E1	Echo function enabled

ECHO - ON-LINE
Type:	Configuration
Format:	AT [cmds] Fn [cmds]
Description:	Selects whether commands sent while in data mode are echoed
Command	Function
F0	Local echo enabled
í F1	Local echo disabled

ERROR CORRECTION MODE (ARQ)
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Description:	Selects active error correction protocols
Command	Function
&M0	Normal mode only enabled
í &M4	Normal/ARQ mode enabled
&M5	ARQ mode only enabled

ESCAPE SEQUENCE
Type:	Immediate
Format:	+++AT [cmds] <CR>
Description:	Initiates the escape sequence and returns the modem to the on-line command state if it receives three escape characters set in S2 within the time allotted by S12.
Note: Do not precede this command with AT.

EXTENDED RESULT CODES
Type:	Configuration
Format:	AT [cmds] &An [cmds]
Description:	Selects extended result codes
Command	Function
&A0	ARQ result codes disabled
í &A1	ARQ result codes enabled

FACTORY DEFAULT PROFILE
Type:	Configuration
Format:	AT [cmds] &F [cmds]
Description:	Load default profile in NVRAM

FLOW CONTROL PASSTHROUGH
Type:	Configuration
Format:	AT [cmds] &In [cmds]
Description:	Allows modem to act on, then transmit XON/XOFF characters.
Command	Function
í &I0	Flow control disabled
&I1	XON/XOFF passthrough enabled
&I2	XON/XOFF passthrough disabled

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] &Hn [cmds]
Description:	Sets type of flow control used by modem
Command	Function
í &H0	Flow control disabled
&H1	CTS/RTS flow control enabled
&H2	XON/XOFF flow control enabled
&H3	CTS/RTS and XON/XOFF flow control enabled

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] &Rn [cmds]
Description:	Controls receive data hardware flow control and RTS signals
Command	Function
í &R1	Modem ignores RTS
&R2	Received data to DTE when RTS is on

GUARD TONE
Type:	Configuration
Format:	AT [cmds] &Gn [cmds]
Description:	Commands the modem to transmit a guard tone
Note: Used primarily for international data transmission
Command	Function
í &G0	Guard tone disabled
&G1	550Hz guard tone enabled
&G2	1800Hz guard tone enabled

HOOK CONTROL
Type:	Immediate
Format:	AT [cmds] Hn [cmds]
Description:	Selects whether the modem is on-hook or off-hook
Command	Function
í H0	Modem commanded to go on-hook (hang-up)
H1	Modem commanded to go off-hook (pick-up)

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] S19=n [cmds]
Default:	0
Range:	0-90
Unit:	1 minute
Description:	Sets the length of time that the modem does not receive information before it disconnects; S19=0 will disable.

JACK TYPE
Type:	Configuration
Format:	AT [cmds] &Jn [cmds]
Description:	Selects jack type
Command	Jack Type
í &J0	RJ-11C
&J1	RJ-12, RJ-13

LIST AMPERSAND COMMANDS
Type:	Immediate
Format:	AT [cmds] &$ [cmds]
Description:	Displays ampersand (&) commands

LIST DIAL COMMANDS
Type:	Immediate
Format:	AT [cmds] D$ [cmds]
Description:	Displays dial commands

LIST S-REGISTERS
Type:	Immediate
Format:	AT [cmds] S$ [cmds]
Description:	Displays the S-registers

ON-LINE
Type:	Immediate
Format:	AT [cmds] O [cmds]
Description:	Return to on-line command (data transmission) mode
Note: The O command must be placed at the end of the command string.

PULSE DIALING
Type:	Configuration
Format:	AT [cmds] P [cmds]
Description:	Enables pulse dialing
Note: This command can be duplicated with the P modifier in the D (Dial) command.

PULSE DIALING RATIO
Type:	Configuration
Format:	AT [cmds] &Pn [cmds]
Description:	Selects pulse dial make/break ratio
Command	Function
í &P0	39/61ms at 10pps (North America)
&P1	33/67ms at 10pps (Europe)

REPEAT COMMAND STRING
Type:	Configuration
Format:	AT [cmds] > [cmds]
Description:	Causes modem to repeat command string until a keyboard key is pressed

REPEAT PREVIOUS COMMAND
Type:	Immediate
Format:	A/
Description:	Repeats previous command, mainly used for redial
Note: Do not precede this command with AT, or follow it with <CR>.

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Reports product code
I1	Reports ROM checksum
I2	Reports RAM checksum
I3	Reports call duration
I4	Reports current command settings
I5	Reports NVRAM settings

RESULT CODES
Type:	Configuration
Format:	AT [cmds] Qn [cmds]
Description:	Enables modem to send result codes to the DTE
Command	Function
í Q0	Result code sending enabled
Q1	Result code sending disabled

RESULT CODE FORMAT
Type:	Configuration
Format:	AT [cmds] Vn [cmds]
Description:	Selects word or numeric format for information-text and result codes
Command	Function
V0	Numeric format enabled
í V1	Verbose (word) format enabled

SELECT CALL PROGRESS RESULT CODES
Type:	Configuration
Format:	AT [cmds] Xn [cmds]
Description:	Enables selection of tone detection and associated result code format options
Command	Function
X0	Busy and dial tone detection disabled; result codes 0-4 enabled.
í X1	Busy and dial tone detection disabled; result codes 0-5 and 10 enabled
X2	Busy tone detection disabled, dial tone detection enabled; result codes 0-6 and 10 enabled; also adaptive dialing, and fast dialing enabled.
X3	Busy tone detection enabled, dial tone detection disabled; result codes 0-5, 7-10 enabled; also adaptive dialing, wait for second dial tone, and wait for answer enabled.
X4	Busy and dial tone detection enabled; result codes 0-10 enabled; also adaptive dialing, wait for second dial tone, wait for answer, and fast dialing enabled.
X5	Busy tone detection enabled, dial tone detection disabled; result codes 0-5, 7-12 enabled; also adaptive dialing, wait for second dial tone, and wait for answer enabled.
X6	Busy and dial tone detection enabled; result codes 0-10 enabled; also adaptive dialing, wait for second dial tone, wait for answer, and fast dialing enabled.
Note: Valid numeric result codes; 0-8, and 10-12.

SERIAL PORT SPEED
Type:	Configuration
Format	AT [cmds] &Bn [cmds]
Description:	Sets the maximum allowable data exchange rate from the local computer and modem.
Command	Function
&B0	Speed of last AT command
&B1	300bps
&B2	600bps
&B3	1200bps
&B4	2400bps
&B5	4800bps
&B6	9600bps
&B7	19.2Kbps

SOFT RESET
Type:	Immediate
Format:	AT [cmds] Z [cmds]
Description:	Resets modem to profiles saved in non-volatile RAM

SPEAKER MODE
Type:	Configuration
Format:	AT [cmds] Mn [cmds]
Description:	Selects various speaker options
Command	Function
M0	Speaker disabled
í M1	Speaker enabled until carrier signal detected
M2	Speaker enabled
M3	Speaker enabled following dialing, then disabled after carrier signal detected.

SPEAKER VOLUME
Type:	Configuration
Format:	AT [cmds] Ln [cmds]
Description:	Controls speaker volume
Command	Function
L0	Low volume setting
L1	Low volume setting
í L2	Medium volume setting
L3	Highest volume setting

STATUS-REGISTER
Type:	Configuration
Format:	Read: AT [cmds] Sn? [cmds] Write: AT [cmds] Sn=x [cmds]
Description:	Writes to or reads from a specified register

STORE ACTIVE PROFILE
Type:	Configuration
Format:	AT [cmds] &W [cmds]
Description:	Writes current values to non-volatile RAM templates

STORE TELEPHONE NUMBER
Type:	Configuration
Format:	AT [cmds] &Zn=(phone # & modifiers)
Description:	Writes selected telephone numbers into the non-volatile memory at location n
Note: The characters described in the D command are valid for use in the &Z command.
Command		Function
&Zn?		Displays phone number from non-volatile memory at location n

TEST MODES
Type:	Configuration
Format:	AT [cmds] S16=n [cmds]
Description:	Controls tests. Analog loopback, dial, and self tests (test pattern).
Command		Function
í S16=0		Testing disabled
S16=1		Local analog loopback enabled
S16=2		Dial test enabled
S16=4		Test pattern enabled
S16=5		Local analog loopback and test pattern enabled

TONE DIALING
Type:	Configuration
Format:	AT [cmds] T [cmds]
Description:	Enables tone dialing mode
Note: This command can be duplicated with the T modifier in the D (Dial) command.