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MODEM 2424

ACER AMERICA CORPORATION

MODEM 2424

Modem Type

Data (synchronous/asynchronous)

Maximum Data Rate

2400bps

Data Bus

External

Data Modulation Protocol

Bell 103A/212A, 201

ITU-T V.22, V.22bis

Error Correction/Compression

MNP4

CONNECTIONS

Purpose

Location

Purpose

Location

Line out

CN1

DC power

CN4

Line in

CN2

Power switch

SW6

RS-232C

CN3

   

OFF HOOK

Status

SW4

» Talk mode

Off

Data mode

On

ANSWER MODE

Status

SW3

» Originate

Off

Answer

On

MODEM SPEED

Speed

SW2

» 2400bps

Off

1200bps

On

AUTO TEST

Status

SW1

» Disabled

Off

Enabled

On

COMMAND SET DISABLE

Status

SW5/1

AT command set disabled

On

AT command set enabled

Off

LINE TYPE

Status

SW5/2

Force leased line

On

Normal operation

Off

ERROR CORRECTION

Status

SW5/3

Disabled

On

Enabled

Off

ECHO AND RESULT CODE

Status

SW5/4

Disabled

On

Normal operation

Off

AUTO ANSWER

Status

SW5/5

Set to one ring

On

Normal operation

Off

SYNCHRONOUS TRANSMIT CLOCK SOURCE

Status

SW5/6

DTE generates clock

On

Normal operation

Off

SYNCRONOUS DATA MODE

Status

SW5/7

Enabled

On

Normal operation

Off

DSR AND CTS

Status

SW5/8

Force high

On

Normal operation

Off

DIAGNOSTIC LED(S)

LED

Status

Condition

EF

On

Error correction enabled

EF

Off

Error correction disabled

HS

On

Modem is operating at 2400bps

HS

Off

Modem is operating at 1200bps or 300bps

AA

On

Auto answer enabled

AA

Off

Auto answer disabled

CD

On

Carrier signal detected

CD

Off

Carrier signal not detected

OH

On

Modem is off-hook

OH

Off

Modem is on-hook

RD

On

Modem is receiving data

RD

Off

Modem is not receiving data

SD

On

Modem is transmitting data

SD

Off

Modem is not transmitting data

TR

On

DTR signal is high

TR

Off

DTR signal is low

MR

On

Power on

MR

Off

Power off

MR

Blinking

Modem is performing self-test

Proprietary AT Command Set

ACCEPT RELIABLE MODE

Type:

Immediate

Format:

AT [cmds] \Un

Example:

AT \U<CR>

Description:

Accepts remote modem’s request for reliable link.

AUTO-RELIABLE TIME BUFFER CONFIGURATION

Type:

Configuration

Format:

AT [cmds] \Cn [cmds]

Example:

AT \C1 &W<CR>

Description:

Controls the handling of incoming data during auto-reliable time period.

Command

Function

» \C0

Data is discarded.

\C1

Data is buffered.

AUTO-RELIABLE FALLBACK CHARACTER

Type:

Register

Format:

AT [cmds] S20=n [cmds]

Example:

ATS20=20<CR>

Default:

0

Range:

0-127

Unit:

ASCII

Description:

Sets the character used as the auto-reliable fallback character. S20=0 will disable this function.

AUTO-RETRAIN

Type:

Configuration

Format:

AT %En

Example:

AT %E1 <CR>

Description:

Selects auto-retrain mode.

Command

Function

» %E0

Auto-retrain disabled.

%E1

Auto-retrain enabled.

BIT MAPPED REGISTER S14

Format

AT [cmds] S14=n [cmds]

Example:

ATS14=40<CR>

Default:

170

Range:

0 - 253

Unit:

Bit-mapped

Description:

Controls CTS signal, command echo, result codes, command set, dialing mode, and answer/originate mode.

Bit

Value

Function

0

» 0

1

CTS normal.

CTS forced high.

1

0

» 1

Command echo disabled.

Command echo enabled.

2

» 0

1

Result codes enabled.

Result codes disabled.

3

0

» 1

Display numeric result codes.

Display verbose result codes.

4

» 0

1

AT command set enabled.

AT command set disabled

5

0

» 1

Tone dialing enabled.

Pulse dialing enabled.

6

0

Not used

7

0

» 1

Answer mode enabled.

Originate mode enabled.

BIT-MAPPED REGISTER S21

Format

AT [cmds] S21=n [cmds]

Example:

ATS21=4<CR>

Default:

32

Range:

0 - 253

Unit:

Bit-mapped

Description:

Selects jack type, CTS signal, low DTR action, DCD signal, DSR signal, and the Long Space Disconnect function.

Bit

Value

Function

0

» 0

1

Selects RJ-11, RJ-41S, or RJ45S jack.

Selects RJ-12 or RJ-13 jack.

1

0

Not used.

2

0

» 1

CTS follows RTS.

CTS forced high.

4, 3

» 00

01

10

11

DTR signal ignored.

Modem goes to command mode on low DTR.

Modem disconnects on low DTR. Auto-Answer is disabled.

Modem is initialized on low DTR.

5

0

» 1

DCD forced high.

DCD normal.

6

0

Not used.

7

» 0

1

Long Space Disconnect function disabled.

Long Space Disconnect function enabled.

BIT-MAPPED REGISTER S22

Format

AT [cmds] S22=n [cmds]

Example:

ATS22=117<CR>

Default:

117

Range:

0-127

Unit:

Bit-mapped

Description:

Controls speaker volume and controls, and limits results codes.

Bit

Value

Function

1, 0

00

» 01

10

11

Off volume.

On volume.

Medium level volume.

High level volume.

3, 2

00

» 01

10

11

Speaker off.

Speaker off on carrier.

Speaker always on.

Speaker on during handshake.

6, 5, 4

000

100

101

110

» 111

Basic result codes only enabled.

Basic and connection speed result codes enabled.

Basic and connection speed result codes and dialtone detection enabled.

All result codes except dialtone detection enabled.

All result codes enabled.

7

» 0

1

39/61ms at 10pps (North America)

33/67ms at 10pps (Europe)

BIT-MAPPED REGISTER S23

Format

AT [cmds] S23=n [cmds]

Example:

ATS23=177<CR>

Default:

5

Range:

0-255

Unit:

Bit-mapped

Description:

Grants/denies remote digital loopback, controls DTE rate and parity, and sets guard tone.

Bit

Value

Function

0

0

» 1

Remote digital loopback denied.

Remote digital loopback allowed.

3, 2, 1

000

001

» 010

011

100

101

110

Sets serial port speed to 0-300bps.

Sets serial port speed to 600bps.

Sets serial port speed to 1200bps.

Sets serial port speed to 2400bps.

Sets serial port speed to 4800bps.

Sets serial port speed to 9600bps.

Sets serial port speed to 19200bps.

5,4

» 00

01

10

11

Even parity.

Space parity.

Odd parity.

Mark or no parity.

7, 6

» 00

01

10

Guard tone disabled.

Guard tone disabled.

Guard tone 1800Hz enabled.

BIT-MAPPED REGISTER S27

Format

AT [cmds] S27=n [cmds]

Example:

ATS27=192<CR>

Default:

9

Range:

0 - 127

Unit:

Bit-mapped

Description:

Selects sync/async mode, line type, clock source, and ITU-T/Bell modes.

Bit

Value

Function

1, 0

00

01

» 10

11

Asynchronous command and data modes.

Asynchronous command, synchronous connect mode.

DTR dialing enabled, synchronous connect mode.

Manual dialing only, synchronous connect mode.

2

» 0

1

Switched line.

Leased line.

3

0

Not used.

5, 4

» 00

01

10

Internal DTE transmit clock source.

External DTE transmit clock source.

Slave DTE transmit clock source.

6

» 0

1

ITU-T mode enabled.

Bell mode disabled.

BREAK SEND

Type:

Configuration

Format:

AT [cmds] \Bn [cmds]

Example:

AT \B3 &W<CR>

Range:

1-9

Unit:

.1 second

Description:

Sends break to modem.

BREAK TYPE

Type:

Configuration

Format:

AT [cmds] \Kn [cmds]

Example:

AT \K1 <CR>

Description:

Configures action of break signal.

Command

Break from DTE

Reliable/Normal mode

Break from DTE

Direct mode

Modem receives \B

Break from remote modem

\K0

Enter command mode, do not send break to remote modem.

Send break to remote modem immediately, then enter command mode.

Buffers cleared and break sent to remote modem.

Buffers cleared and break sent to DTE.

\K1

Buffers cleared and break sent to remote modem.

Send break to remote modem immediately.

Buffers cleared and break sent to remote modem.

Buffers cleared and break sent to DTE.

\K2

Enter command mode, do not send break to remote modem.

Send break to remote modem immediately, then enter command mode.

Send break to remote modem immediately.

Send break to DTE immediately.

\K3

Send break to remote modem immediately.

Send break to remote modem immediately.

Send break to remote modem immediately.

Send break to DTE immediately.

\K4

Enter command mode, do not send break to remote modem.

Send break to remote modem immediately, then enter command mode.

Send break to remote modem with transmitted data.

Break sent with received data to the DTE.

» \K5

Send break with transmitted data.

Send break to remote modem immediately.

Send break to remote modem with transmitted data.

Break sent with received data to the DTE.

CHANGE FUNCTION

Type:

Configuration

Format:

AT [cmds] %Z<cmds>

Example:

AT %Z DP(303)443-3388<CR>

Description:

Changes the function of SW1 to execute the commands given as a parameter. If no commands are given, it restores default setting of self-test.

CONNECT MODE

Type:

Configuration

Format:

AT [cmds] \Nn [cmds]

Example:

AT \N1 DT555-1212<CR>

Description:

Sets connect mode.

Command

Function

\N0

Normal mode.

» \N1

Direct mode.

\N2

Reliable mode.

\N3

Auto-reliable mode.

CONNECTION SPEED UPPER LIMIT

Type:

Configuration

Format:

AT [cmds] %Bn [cmds]

Example:

AT %L3 %B14 \J0<CR>

Description:

Sets fastest allowed connection speed.

Command

Function

%B300

Select 300bps maximum speed.

%B600

Select 600bps maximum speed.

%B1200

Select 1200bps maximum speed.

» %B2400

Select 2400bps maximum speed.

CONVERT TO RELIABLE MODE

Type:

Immediate

Format:

AT [cmds] \Y [cmds]

Example:

AT \Y<CR>

Description:

Initiates reliable mode link.

CTS SIGNAL

Type:

Configuration

Format:

AT [cmds] \Dn [cmds]

Example:

AT \D0<CR>

Description:

Controls action of Clear To Send signal.

Command

Function

» \D0

CTS forced high.

\D1

CTS normal.

DIAL

Type:

Immediate

Format:

AT [cmds] D[phone# & modifiers] [;cmds]

Example:

AT H1 DF 9W *70, 1(303) 555-1212 <CR>

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

DF

Fast pulse dial, sends 20 pulses per second.

DX

Dial second stored telephone number

D\n

Auto redial n times

DM

Set AT\N3, AT\V1, AT\Q1, AT\J0 until modem returns to on-hook.

DISPLAY STORED PHONE NUMBERS

Type:

Immediate

Format:

AT [cmds] \F [cmds]

Example:

AT &Z2=9W1-303-555-1212 \F<CR>

Description:

Displays all stored phone numbers.

ECHO DATA

Type:

Configuration

Format:

AT [cmds] \En [cmds]

Example:

AT \E0<CR>

Description:

Displays data sent from DTR to modem

Command

Function

» \E0

Disabled

\E1

Enabled

EXTENDED RESULT CODES

Type:

Configuration

Format:

AT [cmds] \Vn [cmds]

Example:

AT \V1 %C1<CR>

Description:

Selects MNP result codes.

Command

Function

» \V0

MNP result codes disabled.

\V1

MNP result codes enabled.

FLOW CONTROL TYPE

Type:

Configuration

Format:

AT [cmds] \Qn [cmds]

Example:

AT \Q5<CR>

Description:

Sets type of flow control used by modem.

Command

Function

\Q0

Flow control disabled.

» \Q1

Bidirectional XON/XOFF flow control enabled.

\Q2

CTS flow control by DCE enabled.

\Q3

Bidirectional CTS/RTS flow control enabled.

\Q4

Flow control by DCE disabled.

» \Q5

XON/XOFF flow control by DCE enabled.

\Q6

RTS flow control by DCE enabled.

HELP SCREENS

Type:

Immediate

Format:

AT [cmds] ?n [cmds]

Example:

AT ?1<CR>

Description:

Displays help menus.

Command

Function

» ?1

Displays standard AT command set

?2

Displays proprietary & command set

?3

Displays dial modifier commands

?4

Displays S register contents.

?5

Displays proprietary \ command set

INACTIVITY TIMER

Type:

Register

Format:

AT [cmds] S24=n [cmds]

Example:

ATS24=20<CR>

Default:

0

Range:

0-90

Unit:

1 minute

Description:

Sets the length of time that the modem does not receive information before it disconnects.

INACTIVITY TIMER

Type:

Register

Format:

AT [cmds] \Tn [cmds]

Example:

AT\T20<CR>

Default:

0

Range:

0-255

Unit:

1 second

Description:

Sets the length of time that the modem does not receive information before it disconnects.

INTERFACE PROTOCOL

Type:

Configuration

Format:

AT [cmds] \In [cmds]

Example:

AT \I0<CR>

Description:

Controls data exchange between applications and modem.

Command

Function

» \I0

Disabled.

\I1

Enabled.

FLOW CONTROL

Type:

Configuration

Format:

AT [cmds] \Gn [cmds]

Example:

AT G1 &M0<CR>

Description:

Selects modem port flow control.

Command

Function

» \G0

Flow control disabled.

\G1

Flow control enabled.

LOCK SERIAL PORT

Type:

Configuration

Format:

AT [cmds] \Jn [cmds]

Example:

AT %L3 %B14 \J0<CR>

Description:

Sets operation of serial port speed.

Command

Function

\J0

Serial speed locked.

» \J1

Serial speed follows connect speed.

MAXIMUM BLOCK SIZE FOR TRANSMISSION

Type:

Configuration

Format:

AT [cmds] \An [cmds]

Example:

AT \A3 %C1<CR>

Description:

Sets the maximum transmittable block size.

Command

Function

\A0

MNP block size is 64 characters.

\A1

MNP block size is 128 characters.

\A2

MNP block size is 192 characters.

\A3

MNP block size is 256 characters.

MNP STREAM/BLOCK MODE

Type:

Configuration

Format:

AT [cmds] \Ln [cmds]

Example:

AT \L1 DT555-1212<CR>

Description:

Selects the transfer mode for MNP.

Command

Function

» \L0

Stream mode for MNP enabled.

\L1

Block mode after four second delayfor MNP enabled.

\L2

Block mode for MNP enabled.

ON-LINE IN RELIABLE MODE

Type:

Immediate

Format:

AT [cmds] \On

Example:

AT \O<CR>

Description:

Returns to on-line and requests reliable mode connection.

REPORT CONFIGURATION PROFILES

Type:

Immediate

Format:

AT [cmds] \Sn [cmds]

Example:

AT \S0<CR>

Description:

Reports active configuration profiles.

REPORT CONFIGURATION SWITCH SETTINGS

Type:

Immediate

Format:

AT [cmds] %S [cmds]

Example:

AT %S<CR>

Description:

Displays SW5 settings

REPORT NORMAL/TEST STATUS

Type:

Immediate

Format:

AT [cmds] %F [cmds]

Example:

AT %F<CR>

Description:

Displays current setting of SW1 (Normal/Test)

REPORT PRODUCT VERSION

Type:

Immediate

Format:

AT [cmds] %V [cmds]

Example:

AT I3 &V1 %V<CR>

Description:

Reports product version.

RETURN TO RELIABLE MODE

Type:

Immediate

Format:

AT [cmds] \Z [cmds]

Example:

AT \Z <CR>

Description:

Ends reliable mode link, initiate return to normal mode.

RI SIGNAL

Type:

Configuration

Format:

AT [cmds] \Rn [cmds]

Example:

AT \R0 Q0<CR>

Description:

Controls the behavior of the Ring Indicator signal.

Command

Function

\R0

RI signal high during rings, and forced high for duration of call.

» \R1

RI signal high during rings only.

STORE SECOND PHONE NUMBER IN NVRAM

Type:

Configuration

Format:

AT [cmds] \Pn [dialstring]

Example:

AT\P<CR>

Description:

Stores a second phone number in the modem’s memory.

REDIAL DELAY

Type:

Register

Format:

AT [cmds] S19=n [cmds]

Example:

AT S19=60<CR>

Default:

45

Range:

0-255

Unit:

1 second

Description:

Configures how long the modem will wait to redial a number after a dial attempt has failed.

TEST MODES

Format

AT [cmds] S16=n [cmds]

Example:

ATS16=40<CR>

Default:

0

Range:

0-125

Unit:

Bit-mapped

Description:

Controls loopback tests, analog, digital, remote digital, and self tests.

Bit

Value

Function

0

0

1

Local analog loopback not in progress.

Local analog loopback in progress.

1

0

Not used.

2

0

1

Local digital loopback not in progress.

Local digital loopback in progress.

3

0

1

Remote digital loopback not in progress.

Remote digital loopback in progress.

4

0

1

Remote digital loopback not requested.

Remote digital loopback requested.

5

0

1

Remote digital loopback with self-test not in progress.

Remote digital loopback with self-test in progress.

6

0

1

Local analog loopback with self-test not in progress.

Local analog loopback with self-test in progress.

XON/XOFF PASS-THROUGH

Type:

Configuration

Format:

AT [cmds] \Xn [cmds]

Example:

AT \X0 O<CR>

Description:

Selects whether XON/XOFF signals are sent to remote modem.

Command

Function

» \X0

XON/XOFF signals trapped by local modem.

\X1

XON/XOFF passed through local modem.