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A2144

MEGAHERTZ CORPORATION

A2144

Modem Type

Data (synchronous/asynchronous)/Fax

Maximum Data Rate

14.4Kbps

Maximum Fax Rate

14.4Kbps

Data Bus

PCMCIA Type II

Fax Class

Class II

Data Modulation Protocol

Bell 103A/212A

ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32b, V.32bis

Fax Modulation Protocol

ITU-T V.17, V.21CH2, V.27ter, V.29

Error Correction/Compression

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

V1283

Proprietary AT Command Set

BIT-MAPPED REGISTER S14

Format

AT [cmds] S14=n [cmds]

Example:

ATS14=138<CR>

Default:

138

Range:

0 - 174

Unit:

Bit-mapped

Description:

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

Bit

Value

Function

0

0

Not used.

1

0

» 1

Command echo disabled.

Command echo enabled.

2

» 0

1

Result codes enabled.

Result codes disabled.

3

0

» 1

Display result codes in numeric format.

Display result codes in verbose format.

4

0

Not used.

5

» 0

1

Tone dial enabled.

Pulse dial 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:

AT S21=169 <CR>

Default:

4

Range:

0 - 253

Unit:

Bit-mapped

Description:

Controls 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

1

DSR forced high.

DSR normal.

7

» 0

1

Long Space Disconnect function disabled.

Long Space Disconnect function enabled.

BIT-MAPPED REGISTER S22

Format

AT [cmds] S22=n [cmds]

Example:

AT S22=89 <CR>

Default:

117

Range:

0 - 127

Unit:

Bit-mapped

Description:

Controls speaker volume and controls, and result codes.

Bit

Value

Function

1, 0

00

» 01

10

11

Off volume.

Low 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.

BIT-MAPPED REGISTER S23

Format

AT [cmds] S23=n [cmds]

Example:

ATS23=152<CR>

Default:

183

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

Parity even.

Not used.

Parity odd.

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:

AT S27=8 <CR>

Default:

9

Range:

0 - 127

Unit:

Bit-mapped

Description:

Controls connection mode, line type, internal clock, and protocols.

Bit

Value

Function

3, 1, 0

000

001

» 101

110

Asynchronous mode, serial port speed follows connect speed.

Asynchronous off-line command mode and synchronous connect mode.

Error-correcting mode.

Asynchronous mode, serial port speed locked.

2

» 0

1

Dial up line.

Leased line.

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 protocols.

Bell protocols.

BIT-MAPPED REGISTER S28

Format

AT [cmds] S28=n [cmds]

Example:

AT S28=8 <CR>

Default:

0

Range:

0 - 31

Unit:

Bit-mapped

Description:

Controls V.23 split speed, V.23 split screen, V.23 half duplex, and pulse dialing.

Bit

Value

Function

0

» 0

1

V.23 split speed operation disabled.

V.23 split speed operation enabled.

1

» 0

1

Select 75bps transmit, 1200bps receive.

Select 1200bps transmit, 75bps receive.

2

» 0

1

1200bps transmit , 1200bps receive disabled.

1200bps transmit , 1200bps receive enabled.

4, 3

» 00

01

10

11

39ms make/61ms break at 10pps.

33ms make/67ms break at 10pps.

39ms make/61ms break at 20pps.

33ms make/67ms break at 20pps.

BIT-MAPPED REGISTER S31

Format

AT [cmds] S31=n [cmds]

Example:

AT S31=69 <CR>

Default:

0

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls auto-baud function and result codes.

Bit

Value

Function

0

0

Not used.

1

0

» 1

Auto-baud disabled.

Auto-baud enabled.

2

» 00

01

10

DTE speed displayed in result codes.

Extended result codes enabled and DCE speed displayed in result codes.

DCE speed displayed in result codes.

BIT-MAPPED REGISTER S40

Format

AT [cmds] S40=n [cmds]

Example:

AT S40=155 <CR>

Default:

105

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls power level and break handling, MNP10, link negotiation, and block size.

Bit

Value

Function

0

í0

» 1

MNP10 disabled.

MNP10 enabled.

1

» 0

1

Power level adjustment enabled.

Power level adjustment disabled.

2

» 0

1

Link will be negotiated at highest possible speed.

Link will be negotiated at 1200bps.

5, 4, 3

000

001

010

011

100

» 101

Selects \K0.

Selects \K1.

Selects \K2.

Selects \K3.

Selects \K4.

Selects \K5.

7, 6

00

» 01

10

11

MNP block size is 64 characters.

MNP block size is 128 characters.

MNP block size is 192 characters.

MNP block size is 256 characters.

BIT-MAPPED REGISTER S41

Format

AT [cmds] S41=n [cmds]

Example:

AT S41=18 <CR>

Default:

3

Range:

0 - 31

Unit:

Bit-mapped

Description:

Selects compression, auto-retrain, flow control, and MNP mode.

Bit

Value

Function

1 - 0

00

01

10

» 11

Data compression disabled.

MNP5 enabled.

V.42bis enabled.

MNP5 and V.42bis enabled.

2

» 0

1

Auto-retrain disabled.

Auto-retrain enabled.

3

» 0

1

Flow control disabled.

Flow control enabled.

4

» 0

1

Stream mode for MNP.

Block mode for MNP.

BIT-MAPPED REGISTER S80

Format

AT [cmds] S80=n [cmds]

Example:

AT S80=223< CR>

Default:

0

Range:

0 - 224

Unit:

Bit-mapped

Description:

Controls command sets, remote configuration, and call back security. Also accesses EPROM data lines.

Bit

Value

Function

0 - 4

N/A

EPROM data lines.

5

» 0

1

AT command set enabled.

V.25bis command set enabled.

6

» 0

1

Remote configuration disabled.

Remote configuration enabled.

7

» 0

1

Call back security disabled.

Call back security enabled.

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

Modem receives \B

Break received from remote modem

\K0

Online command mode enabled, send no break to remote modem.

Break sent to remote modem and buffered cleared.

Buffers cleared, break sent to DTE.

\K1

Break sent to remote modem and buffered cleared.

Break sent to remote modem and buffered cleared.

Buffers cleared, break sent to DTE.

\K2

Online command mode enabled, send no break to remote modem.

Send break to remote modem immediately.

Break sent immediately to DTE.

\K3

Send break to remote modem immediately.

Send break to remote modem immediately.

Break sent immediately to DTE.

\K4

Online command mode enabled, send no break to remote modem.

Send break with transmitted data.

Break sent with received data to the DTE.

\K5

Send break with transmitted data.

Send break with transmitted data.

Break sent with received data to the DTE.

CONFIGURATION PROFILES

Type:

Immediate

Format:

AT [cmds] \Sn [cmds]

Example:

AT\S0 <CR>

Description:

Displays active configuration profiles.

CONNECT MODE

Type:

Configuration

Format:

AT [cmds] \Nn [cmds]

Example:

AT \N3 DT555-1212<CR>

Description:

Sets connect mode.

Command

Function

\N0

Normal mode enabled.

\N2

Reliable mode enabled.

\N3

Auto-reliable mode enabled.

\N4

LAPM mode enabled.

\N5

MNP mode enabled.

DISPLAY STORED NUMBERS

Type:

Immediate

Format:

AT [cmds] \Fn [cmds]

Example:

AT \F2=9W1-303-555-1212 \F?<CR>

Description:

Displays all stored phone numbers.

ERROR CORRECTION REJECTION

Format

AT [cmds] S36=n [cmds]

Example:

AT S36=3 <CR>

Default:

7

Range:

0 - 7

Unit:

Bit-mapped

Description:

Configures the modem’s behavior if an error-correcting connection cannot be made.

Bit

Value

Function

0 - 2

000

001

011

100

101

» 111

Modem disconnects.

Modem attempts direct connection.

Modem attempts normal connection.

Modem attempts MNP connection.

Modem attempts MNP connection. If it fails, modem attempts direct connection.

Modem attempts MNP connection. If it fails, modem attempts normal connection.

FLASH DIAL MODIFIER TIME

Format

AT [cmds] S29=n [cmds]

Example:

AT S29=26 <CR>

Default:

0

Range:

0 - 255

Unit:

10 ms

Description:

Time the modem will go on-hook upon receiving the ! dial modifier in dial string.

FLOW CONTROL

Type:

Configuration

Format:

AT [cmds] \Gn [cmds]

Example:

AT G1 &K3<CR>

Description:

Selects modem port flow control.

Command

Function

\G0

Flow control disabled.

\G1

Flow control enabled.

FLOW CONTROL CHARACTER - XOFF

Type:

Register

Format:

AT [cmds] S33=n [cmds]

Example:

ATS33=34 <CR>

Default:

19

Range:

0 - 255

Unit:

ASCII

Description:

Sets the character used to represent XOFF.

FLOW CONTROL CHARACTER - XON

Type:

Register

Format:

AT [cmds] S32=n [cmds]

Example:

ATS32=86 <CR>

Default:

17

Range:

0 - 255

Unit:

ASCII

Description:

Sets the character used to represent XON.

HANDSHAKE OPTIONS

Type:

Configuration

Format:

AT [cmds] S48=n [cmds]

Example:

AT S48=7 <CR>

Default:

7

Range:

0, 7, or 128

Description:

Controls the V.42 handshake sequence.

Command

Function

S48=0

V.42 negotiation disabled.

S48=7

V.42 negotiation enabled.

S48=128

V.42 disabled; fallback according to S36.

LEASED LINE TRANSMISSION LEVEL

Type:

Configuration

Format:

AT [cmds] S99=n [cmds]

Example:

AT S99=8 <CR>

Default:

10

Range:

0 - 15

Unit:

-1 dBm

Description:

Sets the signal level for transmission when in leased-line mode.

LINE TYPE

Type:

Configuration

Format:

AT [cmds] %Mn [cmds]

Example:

AT %M0 H1 DT555-1212<CR>

Description:

Selects line type.

Command

Function

%M0

Switched line.

%M1

Leased line.

MAXIMUM BLOCK SIZE FOR TRANSMISSION

Type:

Configuration

Format:

AT [cmds] \An [cmds]

Example:

AT \A3 &MB28800<CR>

Description:

Sets the maximum transmittable block size.

Command

Function

\A0

Maximum MNP block size is 64 characters.

\A1

Maximum MNP block size is 128 characters.

\A2

Maximum MNP block size is 192 characters.

\A3

Maximum 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 for MNP enabled.

MNP10 COMPRESSION

Type:

Configuration

Format:

AT [cmds] -Kn [cmds]

Example:

AT %C1 -K1 -Q0 <CR>

Description:

Selects MNP10 data compression.

Command

Function

-K0

MNP10 disabled.

-K1

MNP10 enabled.

-K2

MNP10 enabled on originate mode only.

PROTOCOL/SPEED

Type:

Configuration

Format:

AT [cmds] Fn [cmds]

Example:

AT F0 A<CR>

Description:

Selects the current protocol and speed.

Command

Function

F0

Auto-select fastest common protocol.

F1

V.21/Bell 103A 300bps.

F3

V.23 1200/75bps.

F4

V.22/Bell 212A 1200bps.

F5

V.22bis.

F6

V.32bis/V.32 4800bps.

F7

V.32bis 7200bps.

F8

V.32 9600bps

F9

V.32bis 12Kbps

F10

V.32bis 14.4Kbps

PROTOCOL/SPEED

Format

AT [cmds] S37=n [cmds]

Example:

AT S37=0 <CR>

Default:

0

Range:

0 - 15

Unit:

Bit-mapped

Description:

Selects the current protocol and speed.

Bit

Value

Function

3 - 0

» 0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

Auto-select fastest common protocol.

V.21/Bell 103A 300bps.

V.21/Bell 103A 300bps.

V.21/Bell 103A 300bps.

Not used.

V.22.

V.22bis.

V.23 1200/75bps.

V.32bis/V.32 4800bps.

V.32 9600bps.

V.32bis 12Kbps.

V.32bis 14.4Kbps.

V.32bis 7200bps.

SLEEP TIMER

Format

AT [cmds] S24=n [cmds]

Example:

AT S24=40 <CR>

Default:

1

Range:

0 - 255

Unit:

10 ms

Description:

Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep mode.

TEST MODES

Format

AT [cmds] S16=n [cmds]

Example:

AT S16=113<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

Modem not in remote digital loopback.

Remote digital loopback in progress.

4

0

1

Remote digital loopback not requested.

Remote digital loopback requested.

5

0

1

Remote digital loopback w/ self-test not in progress.

Remote digital loopback w/ self-test in progress.

6

0

1

Local analog loopback w/ self-test not in progress.

Local analog loopback w/ self-test in progress.

TEST MODE - PTT

Type:

Configuration

Format:

AT [cmds] %TT [cmds]

Example:

AT %TT &W<CR>

Description:

Send PTT test signals for European line test.

V.23 SPLIT BAUD MODE

Type:

Configuration

Format:

AT [cmds] \Wn [cmds]

Example:

AT \W1 <CR>

Description:

Controls V.23 split baud mode.

Command

Function

\W0

V.23 split baud mode disabled.

\W2

V.23 split baud mode enabled.

WRITE TO LAST STATUS REGISTER

Type:

Configuration

Format:

AT [cmds] S=n [cmds]

Example:

AT S=6 <CR>

Description:

Set value of last accessed S-register.