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EVERCOM INTERNAL MODEM

EVEREX SYSTEMS,INC.

EVERCOM INTERNAL MODEM

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, V.22bis

CONNECTIONS

Function

Label

Function

Label

Line in

CN1

Line out

CN2

USER CONFIGURABLE SETTINGS

Setting

Label

Position

í DCD normal

SW1/4

Off

DCD forced high

SW1/4

On

í RJ11, RJ14, RJ41S, or RJ45 jack type

SW1/5

Off

RJ12 or RJ13

SW1/5

On

SERIAL PORT ADDRESS

Setting

SW1/1

SW1/2

í COM1 (3F8h)

Off

Off

COM2 (2F8h)

On

Off

COM3 (3E8h)

Off

On

COM4 (2E8h)

On

On

INTERRUPT SELECTION

SETTING

SW1/3

IRQ2 (IBM PC/XT) or IRQ9 (IBM AT)

On

í IRQ3 or IRQ4

Off

SUPPORTED COMMAND SET

Basic AT Commands

AT, ‘+++’, ‘Comma’, A/

A, B, D, E, F, H, L, M, O, Q, S, V, X, Y, Z

&D, &G, &L, &P, &T

S Registers

S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S14, S16, S18, S20, S22, S23, S27

Note: See MHI Help file for full command documentation.

BIT-MAPPED REGISTER S21

Format

AT [cmds] S21=n [cmds]

Default:

0

Range:

0-184

Unit:

Bit-mapped

Description:

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

Bit

Value

Function

2 - 0

0

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

0

í 1

DCD forced high

DCD normal

6

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, dial mode, call progress, connect message, and pulse dial make/break ratio.

Bit

Value

Function

1, 0

00

01

í 10

11

Low volume

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

4

0

í 1

Blind dial

Wait for dial tone then proceed with the call

5

0

í 1

Call progress disabled

Call progress enabled

6

0

í 1

‘CONNECT’ message only

‘CONNECT XXXX’ message

7

í 0

1

39/61ms at 10pps (North America)

33/67ms at 10pps (Europe)

BIT-MAPPED REGISTER S27

Format

AT [cmds] S27=n [cmds]

Default:

64

Range:

0-66

Unit:

Bit-mapped

Description:

Selects line type, and ITU-T/Bell modes.

Bit

Value

Function

1, 0

00

Not used

2

í 0

1

Switched line

Leased line

5 - 3

000

Not used

6

0

í 1

ITU/T mode

Bell mode

REPORT INFORMATION

Type:

Immediate

Format:

AT [cmds] In [cmds]

Description:

Displays information requested

Command

Function

I0

Reports product code

I1

Reports ROM checksum

I2

Reports current speed, data bits, and parity