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Card Type

Fax, Modem (synchronous/asynchronous)

Chip Set

Unidentified

Maximum Data Rate

14.4Kbps

Maximum Fax Rate

14.4Kbps

Data Bus

External

Fax Class

Class I

Data Modulation Protocol

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

Fax Modulation Protocol

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

Error Correction/Compression

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

CONNECTIONS

Function

Label

Function

Label

Auxiliary port

CN1

DC power

CN4

Line out

CN2

Power switch

SW1

RS-232/422

CN3

USER CONFIGURABLE SETTINGS

Setting

Label

Position

í DTR signal ignored

SW1/1

On

DTR signal normal

SW1/1

Off

í DCD and DSR forced high

SW1/2

On

DCD and DSR normal

SW1/2

Off

í Echo disabled

SW1/3

On

Echo enabled

SW1/3

Off

í Result codes disabled

SW1/4

On

Result codes enabled

SW1/4

Off

í Leased-line operation

SW1/5

On

Switched line operation

SW1/5

Off

í Auto-answer enabled on 2nd ring

SW1/6

On

Auto-answer disabled on 2nd ring

SW1/6

Off

í Synchronous mode 2 enabled

SW1/7

On

Synchronous mode 2 disabled

SW1/7

Off

í Dumb mode

SW1/8

On

Smart mode

SW1/8

Off

í Flow control to XON/XOFF enabled

SW2/1

On

Flow control to XON/XOFF disabled

SW2/1

Off

í V.25bis command set synchronous HDLC (NRZI) enabled

SW2/2

On

V.25bis command set synchronous HDLC (NRZI) disabled

SW2/2

Off

í Factory configured - DO NOT ALTER

SW2/5

Unidentified

í Factory configured - DO NOT ALTER

SW2/6

Unidentified

í Factory configured - DO NOT ALTER

SW2/7

Unidentified

í Factory defaults loaded up on power-up

SW2/8

On

Do no force factory defaults on power-up

SW2/8

Off

í Factory configured - DO NOT ALTER

LK2

Unidentified

AUXILIARY PORT

Setting

LK1

LK3

LK4

LK5

LK6

LK7

LK8

í PSTN

Pins 2 & 3 closed

Closed

Closed

Closed

Open

Closed

Open

Leased line

Pins 1 & 2 closed

Open

Closed

Open

Closed

Closed

Closed

MODULATION SELECTION

Setting

SW2/3

SW2/4

factory/stored setting

Off

Off

14400 carrier

Off

On

9600 carrier

On

Off

2400 carrier

On

On

SUPPORTED COMMAND SET

Basic AT Commands

AT, �Comma�

A, B, E, H, L, M, N, O, P, Q, S, T, V, W, X, Y, Z

&C, &D, &G, &L, &R, &S, &V, &W, &X, &Y, &Z

Extended AT Commands

\B, \G, \J, \V, \Y, \Z

Special Commands

*H, )M

S Registers

S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S14, S16, S18, S21, S22, S25, S26, S36

S37, S38

Note: See MHI Help file for full command documentation.

ACKNOWLEDGMENT TIMER (T401)

Type:

Configuration

Format:

AT [cmds] %Wn [cmds]

Default:

Unidentified

Range:

0-63

Unit:

Unidentified

Description:

Wait to retransmit time out

Note:

Exception when in MNP mode: If n=0 use Microcom timers. If n=63 use ITU-T V42 Annex A timers.

ANSWER LOGON SEQUENCE

Type:

Register

Format:

AT [cmds] S34=n [cmds]

Default:

0

Range:

0, 128-137

Unit:

Unidentified

Description:

Controls answer logon sequence

Note:

If ATS34=0, then no logon in answer mode

AUTO-RELIABLE FALLBACK CHARACTER

Type:

Configuration

Format:

AT [cmds] S46=n [cmds]

Default:

13

Range:

0-127

Unit:

ASCII

Description:

Sets the character used as the auto-reliable fallback character; %A0 will disable this function.

AUTO-RETRAIN

Type:

Configuration

Format:

AT [cmds] &En [cmds]

Description:

Controls auto-retrain mode

Command

Function

&E0

Auto-retrain disabled

í &E1

Auto-retrain enabled

BIT-MAPPED REGISTER S23

Format

AT [cmds] S23=n [cmds]

Default:

Unidentified

Range:

0-189

Unit:

Bit-mapped

Description:

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

Bit

Value

Function

0

í 1

Remote digital loopback allowed

3 - 1

111

Sets serial port speed to 38400bps

5, 4

11

Mark or No Parity

7, 6

10

Guard tone 1800Hz enabled

BIT-MAPPED REGISTER S24

Format:

AT [cmds] S24=n [cmds]

Default:

143

Range:

0-255

Description:

Controls error control fallback character, error control buffer, data compression, auto-mode detection, extended result code, and lock serial port speed.

Bit

Value

Function

0

í 1

Enable fallback character in S46

1

í 1

Buffer data

2

í 1

Data compression enabled

4, 3

í 01

10

Optimum speed if ATS37=255, except V.34 is disabled

6, 5

í 00

10

Microcom extended result codes enabled

7

í 1

Serial speed follows connect speed

BIT-MAPPED REGISTER S27

Format

AT [cmds] S27=n [cmds]

Default:

10

Range:

0-111

Unit:

Bit-mapped

Description:

Selects synchronous/asynchronous mode, line type, clock source, and ITU-T/Bell modes.

Bit

Value

Function

3, 1, 0

í 110

111

V.42 error correction mode only

2

í 0

1

Leased line

5, 4

í 00

10

Remote DCE/DTE generates transmit clock source

6

í 0

1

Bell mode

BIT-MAPPED REGISTER S28

Format:

AT [cmds] S28=n [cmds]

Default:

8

Range:

0-255

Description:

Controls maximum block size, V.42 detection period (T4ØØ) in 5Ø milliseconds increments, and ODP/ADP

Bit

Value

Function

1, 0

í 11

256 bytes

6 - 2

í 10000

11111

7.75 seconds

7

í 1

Enable ODP/ADP when initiating a reliable V.42 handshake

BIT-MAPPED REGISTER S29

Format:

AT [cmds] S29=n [cmds]

Default:

0

Range:

0-255

Description:

Controls V.42 acknowledgment timer (T4Ø1), V.42 frame check sequence, and V.42 selective reject

Bit

Value

Function

5 - 0

í 000000

111111

10.3 seconds

6

í 0

1

Attempt use if CRC-32

7

í 0

1

Enable V.42 selective reject

BIT-MAPPED REGISTER S30

Format:

AT [cmds] S30=n [cmds]

Default:

15

Range:

0-255

Description:

Controls V.42 windows size Negative ADP, asynchronous MNP2, and remote loopback test

Bit

Value

Function

4 - 0

í 01111

11111

31 packets

5

í 0

1

Enable negative ADP

6

í 0

1

Force asynchronous MNP2

7

í 0

1

Process loopback frame received from remote

BIT-MAPPED REGISTER S31

Format:

AT [cmds] S31=n [cmds]

Default:

0

Range:

0-159

Description:

Controls V.25 bis selection, synchronous mode V.13, abort, DTE Autobauding, and V.25 bis mode.

Bit

Value

Function

1, 0

í 00

11

HDLC V.25 bis NRZI

2

í 0

1

Enable Synchronous mode V.13

3

í 0

1

Ignore keyboard abort on answer enabled

4

í 0

1

Disable DTE Autobauding

6, 5

í 00

Not used

7

í 0

1

V.25bis enabled as per bits 1,Ø

BIT-MAPPED REGISTER S32

Format:

AT [cmds] S32=n [cmds]

Default:

0

Range:

0-255

Description:

Controls encryption mode, MNP extended services, power level adjustment, MNP10 - link negotiation, and MNP1Ø selection.

Bit

Value

Function

1, 0

í 00

11

Not used

3, 2

í 00

10

MNP Extended Services enabled without MNP indication during the answer detect phase

4

í 0

1

Power level adjustment enabled

6, 5

í 00

10

Link will be negotiated at 4800bps

7

í 0

1

MNP10 disabled

BIT-MAPPED REGISTER S39

Format:

AT [cmds] S39=n [cmds]

Default:

128

Range:

0-252

Description:

Controls, DTE rate at 230.4Kbps, DTE rate at 115.2Kbps, break handling, EIA loopback test, and auto retrain

Bit

Value

Function

1, 0

í 00

Not used

2

í 0

1

DTE rate fixed at 23Ø4ØØ bps

3

í 0

1

DTE rate fixed at 1152ØØ bps

5, 4

í 00

11

Buffers cleared, break sent to DTE

6

í 0

1

Enabled EIA loopback test

7

í 1

Auto retrain enabled

BIT-MAPPED REGISTER S49

Format:

AT [cmds] S49=n [cmds]

Default:

Unidentified

Range:

0-255

Description:

Controls flow control, compromise equalizer value, smart/dumb mode, and, compromise equalizer.

Bit

Value

Function

4 - 0

í 00011

10100

DTE to DCE to remote modem bi-directional flow control

5

1

6 dB when compromise equalizer enabled

6

í 0

1

Dumb mode

7

í 0

1

Compromise equalizer disabled

BREAK MODE

Type:

Configuration

Format:

AT [cmds] &In [cmds]

Description:

Controls how the modem handles break conditions on the DTE interface

Command

Function

í &IØ

Break sent in sequence with received data

&I1

Break sent immediately to DTE

&I2

Buffers cleared, break sent to DTE

BREAK TYPE

Type:

Configuration

Format:

AT [cmds] \Kn [cmds]

Description:

Configures action of break signal

Command

Break from DTE

\K0

Online command mode enabled, send no break to remote modem

\K1

Break sent to remote modem and buffers cleared

\K2

Online command mode enabled, send no break to remote modem

\K3

Send break to remote modem immediately

\K4

Online command mode enabled, send no break to remote modem

í \K5

Send break with transmitted data

BUFFERED DATA ON HANG-UP

Type:

Configuration

Format:

AT [cmds] %Dn [cmds]

Default:

Unidentified

Range:

0-255

Unit:

1 second

Description:

Wait for receive buffer to be sent to DTE before hanging up

Command

Function

%DØ

Hang up without clearing buffer

COMMUNICATIONS MODE

Type:

Configuration

Format:

AT [cmds] &Qn [cmds]

Description:

Selects communications mode options

Command

Mode

&Q0

Asynchronous mode enabled

&Q1

Synchronous mode 1 enabled

&Q2

Synchronous mode 2 enabled

&Q3

Synchronous mode 3 enabled

&Q4

Asynchronous direct mode

&Q5

MNP Error correction mode

í &Q6

V.42/MNP error correction mode

&Q7

V.42 error correction mode only

CONNECT MODE

Type:

Configuration

Format:

AT [cmds] \Nn [cmds]

Description:

Controls the type of connection the modem will operate in

Command

Function

\N0

Normal mode enabled

\N1

Direct mode enabled

\N2

MNP reliable mode enabled

\N3

Auto-reliable mode enabled

\N4

V.42 reliable mode enabled

\N5

MNP auto-reliable mode enabled

\N6

Reliable mode enabled

í \N7

Auto-reliable mode enabled

DIAL

Type:

Immediate

Format:

AT [cmds] D<#> [cmds]

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.

Modifier

Function

J

Link will be negotiated at 1200bps, AT*H1 command

K

Power level adjustment enabled, AT)M1 command

P

Pulse dialing enabled

S=n

Dial stored telephone number n

T

Tone dialing enabled/Pulse dialing disabled

,

Dialing paused for amount of time specified in S8 register

DIAL ATTEMPTS

Type:

Register

Format:

AT [cmds] S41=n [cmds]

Default:

0

Range:

0-10

Unit:

1 attempt

Description:

Controls the number of time the modem will redial

DTE AUTOBAUDING

Type:

Configuration

Format:

AT [cmds] %Bn [cmds]

Description:

When AT%B1 is set, the modem will only respond to commands at the same port (DTE) speed

Note:

This command can be used to lock the port speed, see AT\J in the MHI Help file.

Command

Function

%B0

DTE autobauding enabled

í %B1

DTE autobauding disabled

DTE SPEED - DATA MODE

Type:

Configuration

Format:

AT [cmds] &Bn [cmds]

Description:

Controls DTE speed during data mode

Command

Function

&B0

DTE speed follows connect speed

í &B1

DTE speed equals last AT command speed or the default value on power up

ERROR CONTROL BUFFER

Type:

Configuration

Format:

AT [cmds] &On [cmds]

Description:

Controls how buffering is performed during the error control negotiation period

Note:

This command affects how data received is processed by the DCE

Command

Function

&O0

Discard data received during negotiation

í &O1

Buffer data received during negotiation. Data will be sent to the DTE after the connect result code, if error control negotiation fails.

ERROR CORRECTION

Type:

Read-only

Format:

AT [cmds] S44? [cmds]

Description:

Displays which error correction method is in use

Value

Meaning

0

Error correction disabled

2

MNP class 2 enabled

3

MNP class 3 enabled

4

MNP class 4 enabled

5

MNP class 5 enabled

6

V.42 enabled

7

V.42bis enabled

FACTORY DEFAULT PROFILE

Type:

Configuration

Format:

AT [cmds] &F [cmds]

Description:

Sets values in active profile to values found in the default profile

Command

Function

&FØ

V.42 factory defaults

&F1

MNP factory defaults

&F2

Basic asynchronous operation defaults

FLASH MEMORY DOWNLOAD

Type:

Immediate

Format:

AT [cmds] %FLOAD [cmds]

Description:

Retrieve upgrade code to modem through serial port

FLOW CONTROL

Type:

Configuration

Format:

AT [cmds] &Kn [cmds]

Description:

Enables flow control options

Command

Function

&K0

Flow control disabled

í &K3

Local RTS/CTS flow control enabled

&K4

Local XON/XOFF flow control enabled

&K8

Unidirectional Software flow control enabled

&K12

Software flow control - XON/XOFF enabled

&K16

Software - Internal XON/XOFF flow control enabled

&K20

Software - Local XON/XOFF flow control enabled

FLOW CONTROL CHARACTER - XOFF

Type:

Register

Format:

AT [cmds] S48=n [cmds]

Default:

19

Range:

0-255

Unit:

ASCII

Description:

Sets the character used to represent XOFF

FLOW CONTROL CHARACTER - XON

Type:

Register

Format:

AT [cmds] S47=n [cmds]

Default:

17

Range:

0-255

Unit:

ASCII

Description:

Sets the character used to represent XON

INACTIVITY TIMER

Type:

Register

Format:

AT [cmds] S40=n [cmds]

Default:

0

Range:

0-255

Unit:

1 minute

Description:

Sets the length of time that the modem does not receive information before it disconnects; S90=0 will disable.

INGORE KEYBOARD ABORT DURING ANSWER MODE

Type:

Configuration

Format:

AT [cmds] %Qn [cmds]

Description:

Controls the modem to ignore any data sent to the modem while it is in answer mode

Command

Function

í %Q0

Keyboard abort disabled

%Q1

Keyboard abort enabled

LINE SIGNAL LEVEL

Type:

Immediate

Format:

AT [cmds] %Ln [cmds]

Description:

Returns a value which indicates the received line signal level

Command

Function

%L0

Reports signal level in dB

%L1

Reports data pump line status

REDIAL ATTEMPTS ON LINE LOSS

Type:

Configuration

Format:

AT [cmds] {An [cmds]

Default:

Unidentified

Range:

0-3

Unit:

1 attempt

Description:

Number of attempts to attempt to reconnect if line drops by 1 minute intervals

Note:

ATS15=0 - No re-dial

REDIAL ATTEMPTS ON LINE LOSS

Type:

Register

Format:

AT [cmds] S15=n [cmds]

Default:

Unidentified

Range:

0-3

Unit:

1 attempt

Description:

Number of attempts to attempt to reconnect if line drops by 1 minute intervals

Note:

If the re-dial is aborted by a key-press then no further re-dials are attempted.

REASON FOR DISCONNECTION

Type:

Read-only

Format:

AT [cmds] S45? [cmds]

Description:

Displays why the modem disconnected from the link

Value

Meaning

0

Lost carrier

1

User interrupt

2

Training failure

3

Retrain failure

4

Inactivity time out

5

Long space disconnect

6

Negotiation failure

REPORT INFORMATION

Type:

Immediate

Format:

AT [cmds] In [cmds]

Description:

Displays information requested

Command

Function

I0

Reports product code

I1

Reports ROM checksum. The report is displayed as three hexadecimal digits.

I2

Tests and reports ROM checksum, returns �OK� or �ERROR�

I3

Reports firmware revision number

I4

Reports ASCII string test

I5

Reports data pump chipset revision

SMART/DUMB MODE

Type:

Configuration

Format:

AT [cmds] *Dn [cmds]

Description:

Select between smart mode and dumb mode

Command

Function

í *D0

Smart mode enabled

*D1

Dumb mode enabled

TRANSMISSION LEVEL

Type:

Register

Format:

AT [cmds] S35=n [cmds]

Default:

10

Range:

0-20

Unit:

-1 dBm

Description:

Sets the signal level for transmission

TRANSMISSION LEVEL - CELLULAR

Type:

Register

Format:

AT [cmds] S33=n [cmds]

Default:

9

Range:

0-20

Unit:

-1 dBm

Description:

Sets the signal level for transmission while in cellular mode

V.25bis SELECTION

Type:

Configuration

Format:

AT [cmds] %Vn [cmds]

Description:

Sets the V.25bis speed as per S23 bits 3, 2, 1 and S39 bits 3,2

Command

Function

í %VØ

AT command set

%V1

V.25bis command set asynchronous

%V2

V.25bis command set synchronous BSC

%V3

V.25bis command set synchronous HDLC (NRZ)

%V4

V.25bis command set synchronous HDLC (NRZI)