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DESKPORTE 28.8S

MICROCOM, INC.

DESKPORTE 28.8S

Modem Type

Data (synchronous/asynchronous)/Fax

Maximum Data Rate

28.8Kbps

Maximum Fax Rate

Unidentified

Data Bus

External

Fax Class

Unidentified

Data Modulation Protocol

Bell 103A/212A

ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34

Rockwell V.FC

Fax Modulation Protocol

Unidentified

Error Correction/Compression

MNP5, MNP10, V.42, V.42bis

CONNECTIONS

Purpose

Location

Purpose

Location

Line out

CN1

DC power

CN4

Line in

CN2

Power switch

SW1

RS-232/422

CN3

   

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

AA

Red

On

Auto-answer enabled

AA

Red

Off

Auto-answer disabled

RD

Red

On

Modem is receiving data

RD

Red

Off

Modem is not receiving data

SD

Red

On

Modem is transmitting data

SD

Red

Off

Modem is not transmitting data

CD

Red

On

Carrier signal detected

CD

Red

Off

Carrier signal not detected

OH

Red

On

Modem is off-hook

OH

Red

Off

Modem is on-hook

TR

Red

On

DTR signal is high

TR

Red

Off

DTR signal is low

TM

Red

On

Test mode enabled

TM

Red

Off

Test mode disabled

TM

Red

Slow blink

RAM test failed

TM

Red

Medium blink

ROM test failed

TM

Red

Fast blink

MDP(Data Pump) test failed

Proprietary AT Command Set

AUTO-RETRAIN - FALLBACK/FALLFORWARD

Type:

Configuration

Format:

AT [cmds] %En [cmds]

Description:

Controls auto-retrain mode and fallback/fall forward

Command

Function

%E0

Auto-retrain disabled

%E1

Auto-retrain enabled

%E2

Fallback/fall forward enabled

%E3

Auto-retrain enabled, modem will hang up if EQM reaches hang up threshold

BIT-MAPPED REGISTER S14

Format

AT [cmds] S14=n [cmds]

Default:

138

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:

0

Range:

0-248

Unit:

Bit-mapped

Description:

Selects low DTR action, DCD signal, DSR signal, and the Long Space Disconnect function

Bit

Value

Function

2 - 0

0

Not used

4, 3

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

1

DCD forced high

DCD normal

6

0

1

DSR forced high

DSR normal

7

0

1

Long Space Disconnect function disabled

Long Space Disconnect function enabled

BIT-MAPPED REGISTER S22

Format

AT [cmds] S22=n [cmds]

Default:

117

Range:

0-127

Unit:

Bit-mapped

Description:

Controls speaker volume and controls, and limits results codes

Bit

Value

Function

1, 0

00

01

10

11

Off volume

Low level volume

Medium level volume

High level volume

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

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

BIT-MAPPED REGISTER S23

Format

AT [cmds] S23=n [cmds]

Default:

55

Range:

0-189

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

001

010

011

100

101

110

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

Sets serial port speed to 4800bps

Sets serial port speed to 9600bps

Sets serial port speed to 19200bps

5,4

00

01

10

11

Parity even

Not used

Parity odd

No Parity

7, 6

00

01

10

Guard tone disabled

Guard tone disabled

Guard tone 1800Hz enabled

BIT-MAPPED REGISTER S27

Format

AT [cmds] S27=n [cmds]

Default:

73

Range:

0-73

Unit:

Bit-mapped

Description:

Selects sync/async mode and ITU-T/Bell modes

Bit

Value

Function

3, 1, 0

000

101

Asynchronous mode, serial port speed follows connect speed

Error correction mode

5, 4, 2

0

Not used

6

0

1

CCITT mode

Bell mode

BIT-MAPPED REGISTER S28

Format

AT [cmds] S28=n [cmds]

Default:

0

Range:

0-128

Unit:

Bit-mapped

Description:

Controls pulse dialing and MNP10 link negotiation

Bit

Value

Function

2 - 0

0

Not used

4, 3

00

39ms make/61ms break at 10pps

5

0

Not used

7, 6

00

01

10

Link will be negotiated at highest possible speed

Link will be negotiated at 1200bps

Link will be negotiated at 4800bps

BIT-MAPPED REGISTER S31

Format

AT [cmds] S31=n [cmds]

Default:

2

Range:

0-10

Unit:

Bit-mapped

Description:

Controls auto-baud function and result codes

Bit

Value

Function

0

0

Not used

1

0

1

Auto-baud disabled

Auto-baud enabled

3, 2

00

01

10

DTE speed displayed in result codes

Extended result codes enabled; DCE speed displayed in result codes.

DCE speed displayed in result codes

BIT-MAPPED REGISTER S40

Format

AT [cmds] S40=n [cmds]

Default:

105

Range:

0-239

Unit:

Bit-mapped

Description:

Controls power level and break handling; selects MNP extended services, link negotiation, and block size

Bit

Value

Function

1, 0

00

01

10

MNP10 disabled

MNP10 enabled

MNP10 enabled on originate mode only

0

0

1

MNP10 disabled

MNP10 enabled

1

0

1

MNP10 at 2400 and 1200bps disabled

MNP10 at 2400 and 1200bps enabled

2

0

1

Power level adjustment disabled

Power level adjustment enabled

5, 4, 3

000

001

010

011

100

101

\K0

\K1

\K2

\K3

\K4

\K5

7, 6

00

01

10

11

MNP block size is 64 characters

MNP block size is 128 characters

MNP block size is 192 characters

MNP block size is 256 characters

BIT-MAPPED REGISTER S41

Format

AT [cmds] S41=n [cmds]

Default:

195

Range:

0-223

Unit:

Bit-mapped

Description:

Selects compression, auto-retrain, flow control, MNP mode, and fallback-V.22/22bbis

Bit

Value

Function

1 - 0

00

01

10

11

Data compression disabled

MNP5 enabled

V.42bis enabled

MNP5 and V.42bis enabled

6, 2

00

01

10

11

Auto-retrain disabled

Auto-retrain enabled

Fallback/fall forward enabled

Auto-retrain enabled, modem will hang up if EQM reaches hang up threshold

3

0

1

Flow control disabled

Flow control enabled

4

0

1

Stream mode for MNP

Block mode for MNP

5

0

Not used

7

0

1

MNP10 at 2400 and 1200bps disabled

MNP10 at 2400 and 1200bps enabled

BREAK SEND

Type:

Configuration

Format:

AT [cmds] \Bn [cmds]

Default:

3

Range:

1-9

Unit:

.1 second

Description:

Sends break to modem

BREAK TYPE

Type:

Configuration

Format:

AT [cmds] \Kn [cmds]

Description:

Configures action of break signal

Command

Break from DTE

Reliable/Normal mode

Break from DTE

Direct mode

Break from remote modem

\K0

Enter command mode, do not send break to remote modem

Send break to remote modem immediately, then enter command mode

Buffers cleared and break sent to DTE

\K1

Buffers cleared and break sent to remote modem

Send break to remote modem immediately, then enter command mode

Buffers cleared and break sent to DTE

\K2

Enter command mode, do not send break to remote modem

Send break to remote modem immediately

Send break to DTE immediately

\K3

Send break to remote modem immediately

Send break to remote modem immediately, then enter command mode

Send break to DTE immediately

\K4

Enter command mode, do not send break to remote modem

Send break to remote modem immediately

Break sent with received data to the DTE

\K5

Send break with transmitted data

Send break to remote modem immediately

Break sent with received data to the DTE

CELLULAR TRANSMISSION LEVEL

Type:

Configuration

Format:

AT [cmds] @Mn [cmds]

Default:

0

Range:

11-31

Unit:

-1dBm

Description:

Sets the signal level for transmission

Command

Function

@M0

-26dBm

@M1

-30dBm

@M2-@M10

-10dBm

CELLULAR TRANSMISSION LEVEL

Format

AT [cmds] S201=n [cmds]

Default:

58

Range:

0-63

Unit:

Bit-mapped

Description:

Controls cellular transmission level and compromise equalizer

Bit

Value

Function

4 - 0

00000

00001

00010

...

01010

01011

...

11010

...

11111

Sets cellular transmit level level to -26dBm

Sets cellular transmit level level to -30dBm

Sets cellular transmit level level to -10dBm

...

Sets cellular transmit level level to -10dBm

Sets cellular transmit level level to -11dBm

...

Sets cellular transmit level level to -26dBm

...

Sets cellular transmit level level to -31dBm

5

0

1

Equalizer disabled

Equalizer enabled

CHANGE DIAL CODES

Type:

Configuration

Format:

AT [cmds] *Zn [cmds]

Description:

Selects dial codes, for International use

Command

Function

*Z0

Enable dial code 0

*Z1

Enable dial code 1

COMPRESSION

Type:

Configuration

Format:

AT [cmds] %Cn [cmds]

Description:

Selects data compression

Command

Function

%C0

Data compression disabled

%C1

MNP5 enabled

%C2

V.42bis enabled

%C3

MNP5 and V.42bis enabled

COMPROMISE EQUALIZER

Type:

Configuration

Format:

AT [cmds] :En [cmds]

Description:

Controls V.32 compromise equalizer

Command

Function

:E0

Equalizer disabled

:E1

Equalizer enabled

CONNECT MODE

Type:

Configuration

Format:

AT [cmds] \Nn [cmds]

Description:

Sets connect mode

Command

Function

\N0

Normal mode enabled

\N1

Direct mode enabled

\N2

Reliable mode enabled

\N3

Auto-reliable mode enabled

\N4

LAPM mode enabled

\N5

MNP mode enabled

DIAL

Type:

Immediate

Format:

AT [cmds] D<#> [cmds]

Description:

Dials telephone number according to any modifiers included in the string

Modifier

Function

J

Link will be negotiated at 1200bps

K

Power level adjustment enabled

L

Redials last valid dial string

P

Pulse dialing enabled

S=c

Number in memory location c dialed

T

Tone dialing enabled

W

Dialing resumed following dial tone detection

@

Modem waits for a ring-back signal followed by silence up to the time specified in S7 prior to executing the rest of the dial string.

!

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

;

Modem returned to command mode after dialing

^

Disable calling tone

&

Detect bong tone. Modem waits for time specified in S6 before returning NO DIALTONE.

DISPLAY STORED NUMBERS

Type:

Immediate

Format:

AT [cmds] \F [cmds]

Description:

Displays all stored phone numbers

FLOW CONTROL

Type:

Configuration

Format:

AT [cmds] \Gn [cmds]

Description:

Selects modem port flow control

Command

Function

\G0

Flow control disabled

\G1

Flow control enabled

FLOW CONTROL CHARACTER - XOFF

Type:

Register

Format:

AT [cmds] S33=n [cmds]

Default:

19

Range:

0-255

Unit:

ASCII

Description:

Sets the character used to represent XOFF.

FLOW CONTROL CHARACTER - XON

Type:

Register

Format:

AT [cmds] S32=n [cmds]

Default:

17

Range:

0-255

Unit:

ASCII

Description:

Sets the character used to represent XON.

LINE SIGNAL LEVEL

Type:

Immediate

Format:

AT [cmds] %L [cmds]

Range:

9-43

Unit:

-1dBm

Description:

Displays received line signal level

MNP STREAM/BLOCK MODE

Type:

Configuration

Format:

AT [cmds] \Ln [cmds]

Description:

Selects the transfer mode for MNP

Command

Function

\L0

Stream mode for MNP enabled

\L1

Block mode for MNP enabled

MNP10 COMPRESSION

Type:

Configuration

Format:

AT [cmds] -Kn [cmds]

Description:

Selects MNP10 data compression

Command

Function

-K0

MNP10 disabled

-K1

MNP10 enabled

-K2

MNP10 enabled on originate mode only

MAXIMUM BLOCK SIZE FOR TRANSMISSION

Type:

Configuration

Format:

AT [cmds] \An [cmds]

Description:

Sets the maximum transmittable block size

Command

Function

\A0

MNP block size is 64 characters

\A1

MNP block size is 128 characters

\A2

MNP block size is 192 characters

\A3

MNP block size is 256 characters

MNP10 FALL-BACK

Type:

Configuration

Format:

AT [cmds] -Qn [cmds]

Description:

Allows MNP10 to fall back to speeds slower than 4800bps

Command

Function

-Q0

MNP10 at 2400 and 1200bps disabled

-Q1

MNP10 at 2400 and 1200bps enabled

MNP10 LINK NEGOTIATION

Type:

Configuration

Format:

AT [cmds] *Hn [cmds]

Description:

Sets the speed at which MNP10 link negotiation will occur

Command

Function

*H0

Link will be negotiated at highest possible speed

*H1

Link will be negotiated at 1200bps

*H2

Link will be negotiated at 4800bps

Note: *H2 not supported with )M1

MNP10 POWER LEVEL ADJUST

Type:

Configuration

Format:

AT [cmds] )Mn [cmds]

Description:

Controls automatic transmit power level adjustment during MNP 10 link negotiation

Command

Function

)M0

Power level adjustment disabled

)M1

Power level adjustment enabled

Note: )M1 not supported with *H2

MODULATION SELECTION DISPLAY

Type:

Immediate

Format:

AT [cmds] +MSUnidentified [cmds]

Description:

Displays modulation, automode, minimum rate and maximum rate settings

MODULATION SELECTION

Type:

Configuration

Format:

AT [cmds] +MS=xx,y,zzz,aaa [cmds]

Description:

Sets options for active protocol. The transfer rates specified by z and a must be valid for the protocol selected

Command

Function

x=0

V.21

x=1

V.22

x=2

V.22bis

x=3

V.23

x=9

V.32

x=10

V.32bis

x=11

V.34

x=64

Bell 103A

x=69

Bell 212A

x=74

V.FC

y=0

Automode disabled

y=1

Auto-detect highest speed enabled

z, a=300

Set minimum or maximum transfer rate at 300bps, respectively

z, a=1200

Set minimum or maximum transfer rate at 1200bps, respectively

z, a=2400

Set minimum or maximum transfer rate at 2400bps, respectively

z, a=4800

Set minimum or maximum transfer rate at 4800bps, respectively

z, a=7200

Set minimum or maximum transfer rate at 7200bps, respectively

z, a=9600

Set minimum or maximum transfer rate at 9600bps, respectively

z, a=12000

Set minimum or maximum transfer rate at 12000bps, respectively

z, a=14400

Set minimum or maximum transfer rate at 14400bps, respectively

z, a=16800

Set minimum or maximum transfer rate at 16800bps, respectively

z, a=19200

Set minimum or maximum transfer rate at 19200bps, respectively

z, a=21600

Set minimum or maximum transfer rate at 21600bps, respectively

z, a=24000

Set minimum or maximum transfer rate at 24000bps, respectively

z, a=26400

Set minimum or maximum transfer rate at 26400bps, respectively

z, a=28800

Set minimum or maximum transfer rate at 28800bps, respectively

REPORT INFORMATION

Type:

Immediate

Format:

AT [cmds] In [cmds]

Description:

Displays modem properties

Command

Function

I0

Reports OK

I1

Performs checksum of firmware ROM and displays results

I2

Performs checksum of firmware ROM and displays status (OK or ERROR)

I3

Reports firmware version, model code, interface type, and MCU model

I4

Reports identifier string

I5

Reports country code

I6

Reports modem data pump model, internal code revision and CEP internal code revision.

REPORT LINE SIGNAL QUALITY

Type:

Immediate

Format:

AT [cmds] %Q [cmds]

Description:

Reports line signal quality. If the value is greater than 7, the modem will retrain.

SLEEP TIMER

Format

AT [cmds] S24=n [cmds]

Default:

0

Range:

0-255

Unit:

1 second

Description:

Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep mode.

TEST MODES

Format

AT [cmds] S16=n [cmds]

Default:

0

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

2, 1

0

Not used

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

V.23 SPLIT BAUD MODE

Type:

Configuration

Format:

AT [cmds] \Wn [cmds]

Description:

Controls V.23 split baud mode

Command

Function

\W0

V.23 split baud mode disabled

\W1

V.23 split baud mode enabled

V.23 SPLIT-SPEED DIRECTION

Type:

Configuration

Format:

AT [cmds] %Fn [cmds]

Description:

Selects flow control

Command

Function

%F1

75bps transmit/1200bps receive enabled

%F2

75bps receive/1200bps transmit enabled