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US ROBOTICS 2400PC

3COM CORPORATION

US ROBOTICS 2400PC

Modem Type

Data (synchronous/asynchronous)

Maximum Data Rate

2400bps

Data Bus

8-bit ISA

Fax Class

Class I & II

Data Modulation Protocol

Bell 103A/212A

ITU-T V.21, V.22

CONNECTIONS

Purpose

Location

Purpose

Location

Line out

CN1

Volume

SW2

Line in

CN2

   

DTR SIGNAL

Setting

SW1/1

DTR forced high

On

DTR normal

Off

RESULT CODES

Setting

SW1/2

Verbal result codes enabled

Off

Numeric result codes enabled

On

RESULT CODES DISPLAY

Setting

SW1/3

Display disabled

On

Display enabled

Off

ECHO DISPLAY

Setting

SW1/4

Local echo enabled

Off

Local echo disabled

On

AUTO ANSWER

Setting

SW1/5

Modem does not answer on first ring

On

Modem answers on first ring

Off

CARRIER DETECT

Setting

SW1/6

CD normal

Off

CD forced high

On

MULTIPLE PHONE INSTALLATION

Setting

SW1/7

Single phone connected

Off

Multiple phones connected

On

AT COMMAND SET

Setting

SW1/8

AT command set recognized

On

AT command set disabled

Off

ESCAPE CODE

Setting

SW1/9

On

Go to command mode and display OK result code when escape character is received

Off

Disconnect, go to command mode and display NO CARRIER when escape character is received

FACTORY CONFIGURED SETTINGS

Switch

Setting

SW1/10

Not used

COM PORT CONFIGURATION

Port

J1

J2

COM1: (3F8h)

Pins 1 & 2 closed

Pins 1 & 2 closed

COM2: (3E8h)

Pins 3 & 4 closed

Pins 1 & 2 closed

COM3: (2F8h)

Pins 1 & 2 closed

Pins 3 & 4 closed

COM4: (2E8h)

Pins 3 & 4 closed

Pins 3 & 4 closed

INTERRUPT SELECTION

IRQ

J3

3

Pins 3 & 5 closed

4

Pins 1 & 3 closed

5

Pins 2 & 4 closed

7

Pins 4 & 6 closed

Disabled

Open

Proprietary AT Command Set

ANALOG LOOPBACK SELF TEST

Type:

Register

Format:

AT [cmds] S16=n [cmds]

Example:

ATS16=139<CR>

Description:

Selects the tone dialing test.

Command

Function

0

Data mode.

1

Analog loopback.

2

Dial testing.

4

Test pattern.

5

Analog loopback and test pattern.

CLOCK DISPLAY

Type:

Configuration

Format:

AT [cmds] Kn [cmds]

Example:

AT K1 *L2 #E1<CR>

Description:

Automatically establishes switched line connection if leased line fails

Command

Function

K0

Display length of last call.

K1

Display actual time.

HELP SCREENS

Type:

Immediate

Format:

AT <prefix>$

Example:

AT &$<CR>

Description:

Shows command help screens for all commands beginning with the given prefix, or no prefix if none is given.

Command

Function

$

Shows ATx help screen.

D$

Shows ATDx help screen.

S$

Shows S-register help screen.

REPEAT COMMAND STRING

Type:

Configuration

Format:

AT [cmds] > [cmds]

Example:

AT *D1 > #E1<CR>

Description:

Causes modem to repeat command string until a keyboard key is pressed.