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Modem Type

Data (synchronous/asynchronous)/Fax

Maximum Data Rate

14.4Kbps

Maximum Fax Rate

14.4Kbps

Data Bus

PCMCIA Type II

Fax Class

Class I & II

Data Modulation Protocol

ITU-T V.21, V.22, V.22bis, V.32, V.32bis

Fax Modulation Protocol

ITU-T V.17, V.27, V.29

Error Correction/Compression

MNP5, MNP10, V.42, V.42bis

ABORT DIALING

Type:

Register

Format:

AT [cmds] S64=n [cmds]

Example:

AT S64=1<CR>

Description:

Selects whether dialing and handshaking sequences can be interrupted.

Function

Dialing and handshaking are aborted on receipt of a character from the serial port.

Characters received from the serial port during dialing and handshaking are ignored.

BIT-MAPPED REGISTER S14

Format

AT [cmds] S14=n [cmds]

Example:

ATS14=139<CR>

Default:

Unidentified

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls echo, quiet mode, result codes, dial mode, and originate/answer mode.

Bit

Value

Function

0

1

Not used.

1

1

Command echo function enabled.

2

1

Result code sending disabled.

3

1

Verbose format enabled.

4

0

Not used.

5

1

Pulse dialing mode enabled.

6

1

Result codes disabled in answer mode.

7

1

Originate mode enabled.

BIT-MAPPED REGISTER S21

Format

AT [cmds] S21=n [cmds]

Example:

ATS21=1<CR>

Default:

Unidentified

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls stored profile DTR action, DCD signal, and the Long Space Disconnect function.

Bit

Value

Function

0

0

Not used.

1

1

Use stored profile 1.

4, 3, 2

100

Modem dials default number on low DTR.

6, 5

10

DCD signal forced high except during disconnect.

7

1

Long Space Disconnect function enabled.

BIT-MAPPED REGISTER S22

Format

AT [cmds] S22=n [cmds]

Example:

ATS22=114<CR>

Default:

Unidentified

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls volume and speaker settings, result codes, and make/break pulse ratio.

Bit

Function

1, 0

11

Highest volume setting.

3, 2

11

Speaker enabled following dialing, then disabled after carrier signal detected.

6, 5 ,4

111

Busy and dialtone detection enabled, result codes 0-7, 10 enabled.

7

0

Not used.

BIT-MAPPED REGISTER S23

Format

AT [cmds] S23=n [cmds]

Example:

ATS23=114<CR>

Default:

0, read-only (see note)

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls guard tones. Also indicates detected serial port speed and parity. Also provides storage for remote digital loopback tests.

Note:

All bits except bits 6 and 7 are read-only.

Bit

Function

0

Reserved for internal use.

3, 2, 1

Local speed detected at 38400bps.

5, 4

No parity.

7, 6

1800Hz guard tone enabled.

BIT-MAPPED REGISTER S27

Format

AT [cmds] S27=n [cmds]

Example:

ATS27=201<CR>

Default:

Unidentified

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls communications mode, line type, and protocol type.

Note:

Be aware that bits 2 and 3 are out of order.

Bit

Value

Function

3, 1, 0

110

Asynchronous mode, serial port speed locked.

2

0

Not used.

4

0

Not used.

5

0

Not used.

6

1

Select Bell protocols.

7

1

DSR normal.

COMPRESSION

Type:

Register

Format:

AT [cmds] S41=n [cmds]

Example:

AT S41=1<CR>

Description:

Selects data compression.

Command

Function

S41=0

Data compression disabled.

S41=1

MNP data compression enabled.

S41=2

V.42bis data compression enabled.

S41=3

MNP and V.42bis data compression enabled.

COMPRESSION MODE

Type:

Configuration

Format:

AT %Cn

Example:

AT %C1 -K1 -Q0 <CR>

Description:

Selects active compression protocols.

Function

Compression disabled.

MNP compression only enabled.

V.42bis compression only enabled.

MNP and V.42bis compression enabled.

DIAL

Type:

Immediate

Format:

AT [cmds] D<#> [; cmds]

Example:

AT D 9W 1-800-555-2345^,,2554#; ATE1<CR>

Description:

Dials telephone number according to any modifiers included in the string..

Command

Function

L

Redial last number dialed.

^

Transmit calling tone.

FLOW CONTROL

Type:

Configuration

Format:

AT [cmds] \Gn [cmds]

Example:

AT \G1 &K3<CR>

Description:

Selects flow control.

Function

Flow control disabled.

Flow control enabled.

LOOPBACK TESTS

Format

AT [cmds] S16=n [cmds]

Example:

ATS16=32<CR>

Default:

Unidentified

Range:

0 - 255

Unit:

Bit-mapped

Description:

Enables loopback tests.

Note:

Bit 3 is read-only.

Bit

Function

0

Local analog loopback test enabled.

1

Not used.

2

Local digital loopback test enabled.

3

Modem is performing remote digital loopback test.

4

Remote digital loopback test enabled.

5

Remote digital loopback with local self-test enabled.

6

Local analog loopback with local self-test enabled.

7

Not used.

MNP10 COMPRESSION

Type:

Configuration

Format:

AT [cmds] -Kn [cmds]

Example:

AT %C1 -K1 -Q0 <CR>

Description:

Selects MNP10 data compression.

Function

MNP10 disabled.

MNP10 enabled.

MNP10 enabled after V.42 answer mode detection.

MNP10 FALL-BACK

Type:

Configuration

Format:

AT [cmds] -Qn [cmds]

Example:

AT *H0 -Q1 <CR>

Description:

Allows MNP10 to fall back to speeds slower than 4800bps.

Function

MNP10 at 2400 and 1200bps disabled.

MNP10 at 2400 and 1200bps enabled.

MNP10 LINK NEGOTIATION

Type:

Configuration

Format:

AT [cmds] *Hn [cmds]

Example:

AT *H0 -Q1 <CR>

Description:

Sets the speed at which MNP10 link negotiation will occur.

Function

Link will be negotiated at highest possible speed.

Link will be negotiated at 1200bps.

Link will be negotiated at 4800bps.