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2400 BPS INTERNAL MODEM (REV. A)

BUSINESSLAND INC.

2400 BPS INTERNAL MODEM (REV. A)

Card Type

Data (asynchronous)

Chip Set

Unidentified

Maximum Transfer Rate

2400bps

Data Bus

8-bit ISA

Data Modulation Protocol

Bell 103/113/212A

ITU-T V.22, V.22bis

Error Correction/Compression

MNP5, X.PC

CONNECTIONS

Function

Label

Function

Label

Line out

CN1

Line in

CN2

USER CONFIGURABLE SETTINGS

Setting

Label

Position

Factory configured - Do not alter

SW1/3

Open

Factory configured - Do not alter

SW1/4

Open

SERIAL PORT ADDRESS

Setting

SW1/1

SW1/2

COM1 (3F8h)

Closed

Open

í COM2 (2F8h)

Open

Open

COM3 (3E8h)

Closed

Closed

COM4 (2E8h)

Open

Closed

Proprietary AT Command Set

AUTO-RELIABLE FALLBACK CHARACTER

Type:

Configuration

Format:

AT [cmds] %An [cmds]

Default:

0

Range:

0-127

Unit:

ASCII

Description:

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

AUTO-RELIABLE TIME BUFFER CONFIGURATION

Type:

Configuration

Format:

AT [cmds] \Cn [cmds]

Description:

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

Command

Function

í \C0

Data is discarded

\C1

Data is buffered

\C2

Data is discarded, modem returns to normal mode on receiving auto-reliable fallback character

BIT-MAPPED REGISTER S14

Format

AT [cmds] S14=n [cmds]

Default:

Unidentified

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]

Default:

Unidentified

Range:

0-184

Unit:

Bit-mapped

Description:

Selects low DTR action, DCD signal, and the long space disconnect function.

Bit

Value

Function

2 - 0

0

Not used.

4, 3

00

01

10

11

DTR Forced

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]

Default:

Unidentified

Range:

0-252

Unit:

Bit-mapped

Description:

Controls speaker controls, limits results codes, and make/break ratio.

Bit

Value

Function

1, 0

0

Not used

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

Busy and dialtone detection disabled, result codes 0-4 enabled.

Busy and dialtone detection disabled, result codes 0-5, 10 enabled.

Busy tone detection disabled, dialtone detection enabled, result codes 0-6, 10 enabled.

Busy tone detection enabled, dialtone detection disabled, result codes 0-5, 7, 10 enabled.

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

Default:

Unidentified

Range:

0-187

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

010

011

101

Sets serial port speed to 0-300bps

Sets serial port speed to 1200bps

Sets serial port speed to 2400bps

Sets serial port speed to 9600bps

5,4

00

01

10

11

Parity even

Space Parity

Parity odd

Mark/No Parity

7, 6

00

01

10

Guard tone disabled

Guard tone 550Hz enabled

Guard tone 1800Hz enabled

COMPRESSION

Type:

Configuration

Format:

AT [cmds] %Cn [cmds]

Description:

Selects data compression

Command

Function

%C0

Data compression disabled

í %C1

Data compression enabled

DISPLAY CURRENT COMMAND STATUS

Type:

Immediate

Format:

AT [cmds] \S [cmds]

Description:

Displays current setting of modem commands

CONNECT MODE

Type:

Configuration

Format:

AT [cmds] \Nn [cmds]

Description:

Sets connect mode

Command

Function

\N0

Normal mode enabled

í \N1

Direct mode enabled

\N2

MNP reliable mode enabled

\N3

MNP auto-reliable mode enabled

\N4

X.PC mode only enabled

\N5

MNP/X.PC answer mode enabled

CONVERT TO RELIABLE MODE

Type:

Immediate

Format:

AT [cmds] \Y [cmds]

Description:

Initiates reliable mode link

DIAL

Type:

Immediate

Format:

AT [cmds] D<#> [cmds]

Description:

Dials telephone number according to any modifiers included in the string

Modifier

Function

D,

Dialing paused for amount of time specified in S8 register

DT

Tone dialing enabled

DP

Pulse dialing enabled

DR

Reverse mode

DS=n

Number in memory location n dialed

D;

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

D!

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

DW

Dialing resumed following dial tone detection

D@

Modem waits for a ring-back signal followed by 5 seconds of silence prior to executing the rest of the dial string

DX

Modem in X.PC mode for duration of call

DM

Modem in MNP auto-reliable mode for duration of call

DV

Modem in X.PC mode, send X.PC request string.

DISPLAY ALL S-REGISTERS

Type

Immediate

Format

AT [cmds] %R [cmds]

Description

Displays a value of all S-registers

DSR AND CTS SIGNALS

Type:

Configuration

Format:

AT [cmds] \Dn [cmds]

Description:

Sets the function of the DSR and CTS signals

Command

Function

í \D0

DSR and CTS forced high

\D1

DSR forced high and CTS follows CD

FLOW CONTROL

Type:

Configuration

Format:

AT [cmds] \Gn [cmds]

Description:

Selects modem port flow control

Command

Function

í \G0

Flow control disabled

\G1

Flow control enabled

FLOW CONTROL TYPE

Type:

Configuration

Format:

AT [cmds] \Qn [cmds]

Description:

Sets type of flow control used by modem

Command

Function

í \Q0

Flow control disabled

\Q1

XON/XOFF flow control enabled

\Q2

CTS flow control to DTE enabled

\Q3

RTS/CTS flow control 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

LOCK SERIAL PORT

Type:

Configuration

Format:

AT [cmds] \Jn [cmds]

Description:

Sets operation of serial port speed

Command

Function

í \J0

Serial speed locked

\J1

Serial speed follows connect speed

EXTENDED RESULT CODES

Type:

Configuration

Format:

AT [cmds] \Vn [cmds]

Description:

Selects extended result codes

Command

Function

í \V0

Standard AT result codes enabled

\V1

Error correction result codes enabled

ON-LINE IN RELIABLE MODE

Type:

Immediate

Format:

AT [cmds] \O [cmds]

Description:

Returns to on-line and requests reliable mode connection

ON-LINE STATE/RDL TEST

Type

Configuration

Format

AT [cmds] On [cmds]

Description

Starts/ends remote digital loopback test and puts the modem in on-line command mode

Command

Function

O0

Return to on-line state

O1

End remote digital loopback test and return to on-line state

O2

Begin remote digital loopback test and return to on-line state

PACKET TRANSMISSION DELAY

Type

Register

Format

AT [cmds] S50=n [cmds]

Default

25

Range

10-255

Unit

1 ms

Description

Sets the maximum delay preceding a character from DTE until X.PC block is sent

REPORT INFORMATION

Type:

Immediate

Format:

AT [cmds] In [cmds]

Description:

Displays modem properties

Command

Function

I0

Reports product code

I1

Reports checksum

I2

Reports checksum result

RETURN TO RELIABLE MODE

Type:

Immediate

Format:

AT [cmds] \Z [cmds]

Description:

Ends reliable mode link, initiate return to normal mode

TEST MODES

Format

AT [cmds] S16=n [cmds]

Default:

Unidentified

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

XON/XOFF PASS-THROUGH

Type:

Configuration

Format:

AT [cmds] \Xn [cmds]

Description:

Selects whether XON/XOFF signals are sent to remote modem

Command

Function

í \X0

XON/XOFF signals trapped by local modem

\X1

XON/XOFF passed through local modem

X.PC DISCONNECT

Type

Immediate

Format

AT [cmds] %H [cmds]

Description

Modem will disconnect but still remain connected to network node