...because we can't all be on the bleeding edge...





PM2400

PRACTICAL PERIPHERALS, INC.

PM2400

Card Type

Modem (asynchronous)

Chip Set

Unidentified

Maximum Data Rate

2400bps

Data Bus

8-bit ISA

Data Modulation Protocol

Bell 103/212A

ITU-T V.22

V2037

SERIAL PORT ADDRESS

Setting

IRQ

SW1/A

SW1/B

COM1 (3F8h)

4

On

On

COM2 (2F8h)

3

Off

Off

COM3 (3E8h)

4

On

Off

COM4 (2E8h)

3

Off

On

MISCELLANEOUS TECHNICAL NOTES

Diagram not available

Proprietary AT Command Set

BIT-MAPPED REGISTER S14

Format:

AT [cmds] S14=n [cmds]

Default:

170

Range:

0-174

Unit:

Bit-mapped

Description:

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

Bit

Value

Function

0

í 0

Not used

1

0

í 1

Command echo disabled

Command echo enabled

2

í 0

1

Result codes enabled

Result codes disabled

3

0

í 1

Display result codes in numeric format

Display result codes in verbose format

4

í 0

Not used

5

0

í 1

Tone dial enabled

Pulse dial enabled

6

í 0

Not used

7

0

í 1

Answer mode enabled

Originate mode enabled

BIT-MAPPED REGISTER S21

Format

AT [cmds] S21=n [cmds]

Default:

0

Range:

0-185

Unit:

Bit-mapped

Description:

Selects jack type, CTS/DCD/DSR signals, low DTR action, and the long space disconnect function

Bit

Value

Function

0

í 0

1

Selects RJ-11, RJ-41S, or RJ45S jack

Selects RJ-12 or RJ-13 jack

2, 1

í 00

Not used

4, 3

í 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

í 0

1

DCD forced high

DCD normal

6

í 0

Not used

7

í 0

1

Long space disconnect function disabled

Long space disconnect function enabled

BIT-MAPPED REGISTER S22

Format

AT [cmds] S22=n [cmds]

Default:

118

Range:

0-255

Unit:

Bit-mapped

Description:

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

Bit

Value

Function

1, 0

00

01

í 10

11

Volume off

Low level volume

Medium level volume

High level volume

3, 2

00

í 01

10

11

Speaker off

Speaker off on carrier

Speaker always on

Speaker on during handshake

6 - 4

000

100

101

110

í 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

7

í 0

1

39/61ms at 10pps (North America)

33/67ms at 10pps (Europe)

BIT-MAPPED REGISTER S23

Format

AT [cmds] S23=n [cmds]

Default:

7

Range:

0-247

Unit:

Bit-mapped

Description:

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

Bit

Value

Function

0

0

í 1

Remote digital loopback denied

Remote digital loopback allowed

2, 1

00

01

10

í 11

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

3

í 0

Not used

5, 4

í 00

01

10

11

Parity even

Space parity

Parity odd

Mark or no parity

7, 6

í 00

01

10

11

Guard tone disabled

Guard tone 550Hz enabled

Guard tone 1800Hz enabled

Not used

BIT-MAPPED REGISTER S27

Format

AT [cmds] S27=n [cmds]

Default:

64

Range:

0-64

Unit:

Bit-mapped

Description:

Selects ITU-T/Bell modes

Bit

Value

Function

5 - 0

í 000000

Not used

6

0

í 1

ITU/T mode

Bell mode

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

L

Re-dial last number

P

Pulse dialing enabled

R

Answer mode enabled, originate mode disabled following handshake initiation

S=n

Dial stored telephone number n

T

Tone dialing enabled

W

Dialing resumed following dial tone detection

,

Dialing paused for amount of time specified in S8 register

!

Modem commanded to go off-hook for specified time before returning on-hook

@

Wait for quiet answer

;

Modem returned to command state after dialing

REPORT INFORMATION

Type:

Immediate

Format:

AT [cmds] In [cmds]

Description:

Displays information requested

Command

Function

I0

Reports product code, e.i. 24x, the x represents the revision level

I1

Reports ROM checksum

I2

Reports ‘OK’

I3

Reports product number