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28.8 EXTERNAL MODEM

ACER, INC.

28.8 EXTERNAL MODEM

Card Type

Modem(synchronous/asynchronous), Fax

Chip Set

Unidentified

Maximum Data Rate

28.8Kbps

Maximum Fax Rate

14.4Kbps

Data Bus

External

Fax Class

Class I & II

Data Modulation Protocol

Bell 103A/212A

ITU-T V.22, V.22bis, V.32, V.32bis, V.32terbo, V.34

Fax Modulation Protocol

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

Error Correction/Compression

MNP2-5, V.42, V.42bis

CONNECTIONS

Function

Label

Function

Label

Line in

CN1

RS-232/422

CN3

Line out

CN2

DC power

CN4

DIAGNOSTIC LED(S)

LED

Status

Condition

MR

On

Power is on

MR

Off

Power is off

TR

On

DTR signal is high

TR

Off

DTR signal is low

SD

On

Modem transmitting data

SD

Off

Modem not transmitting data

RD

On

Modem receiving data

RD

Off

Modem not receiving data

OH

On

Modem is off-hook

OH

Off

Modem is on-hook

CD

On

Carrier signal detected

CD

Off

Carrier signal not detected

AA

On

Auto-answer enabled

AA

Off

Auto-answer disabled

EC

On

Error correction in progress

EC

Off

Error correction inactive

Proprietary AT Command Set

AUTO ANSWER RING COUNT

Type:

Register

Format:

AT [cmds] S0=n [cmds]

Unit:

1 ring

Description:

Sets the number of rings allowed before the modem automatically goes off-hook

Note:

If S0=0, automatic-answering is disabled. The A command must be used to go off-hook.

Country

Default

Range

Standard

0

0-255

France

0

0,2-3

Germany

0

0-5

Switzerland

0

0,2-9

Italy

0

0,2

Auto-reliable fallback character

Type:

Register

Format

AT [cmds] S29=n [cmds]

Default:

0

Range:

Unidentified

Unit:

Unidentified

Description:

The character used for fallback in auto-reliable mode

Baud rate set selection

Type:

Configuration

Format:

AT [cmds] %Nn [cmds]

Description:

Sets the type of baud rates the modem uses

Note:

This command only functions in the external version

Command

Function

%N0

Sets modem to IBM PC DTE baud rates

%N1

Sets modem to NEC PC98 DTE baud rate set 1

%N2

Sets modem to NEC PC98 DTE baud rate set 2

BIT MAPPED REGISTERS

Register

Default

S14

137

S15

83

S17

75

S19

3

S20

0

S21

48

S22

246

S23

12

S24

72

S27

0

S28

16

BLIND DIALING DELAY

Type:

Register

Format

AT [cmds] S6=n [cmds]

Unit:

1 second

Description:

Duration of delay after modem goes off-hook and before dialing blindly during modes set by X0, X1 or X3 commands.

Country

Default

Range

Standard

2

2-255

United Kingdom

4

4-7

Switzerland

2

5-15

CARRIER LOSS RESPONSE TIME

Type:

Register

Format

AT [cmds] S10=n [cmds]

Unit:

.1 second

Description:

Maximum time allowed by the modem after losing the carrier signal and prior to initiating hang-up process.

Country

Default

Range

Standard

14

1-255

Germany

14

2-204

COMMUNICATIONS MODE

Type:

Configuration

Format:

AT [cmds] &Qn [cmds]

Description:

Selects communications mode options

Command

Mode

í &Q0

Asynchronous mode, serial port speed follows connect speed.

&Q1

Asynchronous off-line command mode and synchronous connect mode.

&Q2

If an off to on DTR transition occurs, modem automatically dials first number in directory, then activates synchronous connect mode.

&Q3

Synchronous connect mode on high DTR.

COMMUNICATION PROTOCOLS

Type:

Configuration

Format:

AT [cmds] Bn [cmds]

Description:

Selects the communication protocol for data calls

Note:

The B command allows the simultaneous selection of more than one suffix, enabling multiple protocols.

Command

Protocol

B0

ITU-T V.22 at 1200bps or V.21 at 300

B1

Bell 212A at 1200bps or Bell 103 at 300

B2

In V.23 originate mode receive at 1200bps transmit at 75bps; in answer mode receive at 75bps transmit at 1200bps

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.

Command

Function

DP

Pulse dialing enabled

DR

Answer mode enabled; originate mode disabled following handshake initiation.

DS=n

Dial stored telephone number n (n= 0 to 3)

DT

Tone dialing enabled/Pulse dialing disabled

DW

Dialing resumed following dial tone detection

D,

Dialing paused for amount of time specified in S8 register

D"WXY"

Optional method of denoting telephone numbers. Letters enclosed in quotes are interpreted as numbers according to the system found on a telephone keypad.

D!

Flash function initiated. Modem commanded to go off-hook for specified time before returning on-hook.

D@

Wait for Quiet Answer function enabled. Modem waits until a "quiet answer," a ring-back signal followed by silence up to the time specified in S7, is received prior to executing the rest of the dial string.

D;

Modem returned to idle state after dialing. The semicolon can only be placed at the end of the dial command.

D^

Enables calling tone for data modem

dumb mode

Type:

Configuration

Format:

AT [cmds] %Dn [cmds]

Description:

Puts the modem into dumb mode

Note:

Used in situations where the modemís microprocessor is not required, such as connection to a mainframe, leased line, or in synchronous mode

Command

Function

%D0

Dumb mode disabled

%D1

Dumb mode enabled

INACTIVITY TIMER

Type:

Configuration

Format:

AT [cmds] \Tn [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.

INACTIVITY TIMER

Type:

Register

Format

AT [cmds] S30=n [cmds]

Default:

0

Range:

0-90

Unit:

1 second

Description:

Maximum duration of DTE and DCE inactivity allowed prior to initiating hang-up process.

Note:

S30=0 disables the timer and allows indefinite inactivity.

Modem connection speed

Type:

Configuration

Format:

AT [cmds] %Bn [cmds]

Description:

Sets the maximum connection speed

Command

Function

%B300

300bps

%B1200

1200bps

%B2400

2400bps

%B4800

4800bps

%B7200

7200bps

%B9600

9600bps

%B12000

12.0Kbps

%B14400

14.4Kbps

%B16800

16.8Kbps

%B19200

19.2Kbps

%B21600

21.6Kbps

%B24000

24.0Kbps

%B26400

26.4Kbps

%B28800

28.8Kbps

NO CARRIER TIME-OUT

Type:

Register

Format

AT [cmds] S7=n [cmds]

Unit:

1 second

Description:

Maximum time the modem waits after dialing to detect a carrier signal from the remote modem for both originating and answering calls.

Note:

W dial modifier also uses S7 to set the maximum time to wait.

Country

Default

Range

Standard

45

1-255

France

45

30-85

Germany

45

5-80

Switzerland

45

5-55

Italy

50

45-50

PULSE DIALING RATIO

Type:

Configuration

Format:

AT [cmds] &Pn [cmds]

Description:

Selects pulse dial make/break ratio

Command

Function

í &P0

33/67ms at 10pps (Europe)

&P1

39/61ms at 10pps

&P2

33/67ms at 20pps

REPORT INFORMATION

Type:

Immediate

Format:

AT [cmds] In [cmds]

Description:

Displays information requested

Command

Function

I0

Reports modem product code

I1

Reports ROM checksum

I2

Tests and reports ROM checksum

I3

Reports model and firmware identification

I5

Reports country code

RTS TO CTS DELAY

Type:

Register

Format

AT [cmds] S26=n [cmds]

Default:

1

Range:

0 - 255

Unit:

.01 second

Description:

Sets the duration of delay for CTS to respond to RTS status change

Note:

This is only used when &R0 is set.

TONE PULSE DURATION

Type:

Register

Format

AT [cmds] S11=n [cmds]

Default:

95

Range:

50-255

Unit:

1 ms

Description:

DTMF tone pulse duration and time between tone pulses for tone dialing operations.

Country

Default

Range

Standard

95

50-255

France

85

70-90

Germany

85

85-95

Switzerland

85

70-90

Italy

85

65-150

Spain

135

135-255

TRANSMISSION LEVEL - PSTN

Type

Register or Configuration

Format

AT [cmds] S91=n [cmds]

Unit

-1 dBm

Description

Sets the signal level for transmission over switched phone lines

Country

Default

Range

Standard

12

0-15

Sweden

14

0-15