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VFX 14.4V

ZOOM TELEPHONICS, INC.

VFX 14.4V

Modem Type

Data (synchronous/asynchronous)/Fax/Voice

Maximum Data Rate

14.4Kbps

Maximum Fax Rate

14.4Kbps

Data Bus

External

Fax Class

Class I & II

Data Modulation Protocol

Bell 103A/212A

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

Fax Modulation Protocol

ITU-T V.17, V.21CH2, V.27ter, V.29

Error Correction/Compression

MNP5, 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

MSG

Red

On

Stored faxes exist

MSG

Red

Off

No faxes stored

FAX

Red

On

Modem is connected in FAX mode

FAX

Red

Off

Modem is not connected in FAX mode

14.4

Red

On

Modem connected at 14.4Kbps

14.4

Red

Off

Modem not connected at 14.4Kbps

V.32

Red

On

Modem is in V.32 mode.

V.32

Red

Off

Modem is not in V.32 mode.

V.42

Red

On

Modem is in V.42 mode.

V.42

Red

Off

Modem is not in V.42 mode.

DC

Red

On

Error correction enabled

DC

Red

Off

Error correction disabled

EC

Red

On

Error correction enabled

EC

Red

Off

Error correction disabled

FC

Red

On

Flow control enabled

FC

Red

Off

Flow control disabled

AA

Red

On

Auto-answer enabled

AA

Red

Off

Auto-answer disabled

AA

Red

Blinking

Phone is ringing

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

RX

Red

On

Modem is receiving data

RX

Red

Off

Modem is not receiving data

TX

Red

On

Modem is transmitting data

TX

Red

Off

Modem is not transmitting data

TR

Red

On

DTR signal is high

TR

Red

Off

DTR signal is low

MR

Red

On

Power is on

MR

Red

Off

Power is off

Proprietary AT Command Set

AUTO-RETRAIN

Type:

Configuration

Format:

AT %En

Example:

AT %E1 <CR>

Description:

Selects auto-retrain mode.

Command

Function

» %E0

Auto-retrain disabled.

%E1

Auto-retrain enabled.

%E2

Fallback/fall forward enabled.

%E3

Fallback/fall forward and fast hang-up enabled.

COMPRESSION

Type:

Configuration

Format:

AT %Cn

Example:

AT *EC0 %C1 *AP0<CR>

Description:

Selects data compression.

Command

Function

%C0

Data compression disabled.

%C1

MNP5 enabled.

%C2

V.42bis enabled.

» %C3

MNP5 and V.42bis enabled.

BREAK SEND

Type:

Configuration

Format:

AT [cmds] \Bn [cmds]

Example:

AT \B3 &W<CR>

Default:

3

Range:

1-9

Unit:

.1 second

Description:

Sends break to modem.

FLOW CONTROL TYPE

Type:

Configuration

Format:

AT [cmds] \Kn [cmds]

Example:

AT \K1 <CR>

Description:

Configures action of break signal.

Command

Function

\K0

Flow control disabled.

» \K3

RTS/CTS flow control enabled.

\K4

XON/XOFF flow control enabled.

CONNECT MODE

Type:

Configuration

Format:

AT [cmds] \Nn [cmds]

Example:

AT \N1 DT555-1212<CR>

Description:

Sets connect mode.

Command

Function

\N0

Normal mode enabled.

\N1

Direct mode enabled.

\N2

Error correction mode enabled.

» \N3

MNP mode with fallback to normal mode enabled.

\N4

LAPM mode only enabled.

\N5

MNP mode enabled.

CONNECTION FAILURE CODES

Format

AT [cmds] S86? [cmds]

Example:

ATS86? <CR>

Default:

Read-only

Range:

0, 4 - 14

Unit:

None

Stored:

N/A

Description:

Reports codes which correspond to the possible causes of a connection failure.

Value

Meaning

0

No failure - normal hang-up.

4

Carrier signal lost.

5

No error-control detected for remote modem during feature negotiation.

6

Remote modem failed to respond to feature negotiation.

7

Local modem is asynchronous-only, remote modem is synchronous-only.

8

No common framing technique found.

9

No common protocol found.

10

Remote modem sent erroneous feature negotiation message.

11

Remote modem failed to send synchronous information.

12

No failure - remote modem disconnected normally.

13

Remote modem failed to respond after 10 re-transmissions same message.

14

Violation of negotiated protocol caused failure.

ERROR CORRECTION REJECTION

Format

AT [cmds] S36=n [cmds]

Example:

ATS36=0<CR>

Default:

Unidentified

Range:

0 - 7

Unit:

Bit-mapped

Description:

Configures the modem’s behavior if an error-correcting connection cannot be made.

Command

Function

0

Modem disconnects

3

Modem attempts normal connection.

4

Modem attempts MNP connection.

7

Modem attempts MNP connection. If it fails, modem attempts normal connection.

FLASH DIAL MODIFIER TIME

Format

AT [cmds] S29=n [cmds]

Example:

ATS29=0<CR>

Default:

0

Range:

0-255

Unit:

10 ms

Description:

Time the modem will go on-hook upon receiving the ! dial modifier in dial string.

FLOW CONTROL

Type:

Configuration

Format:

AT [cmds] \Gn [cmds]

Example:

AT G1 &K3<CR>

Description:

Selects modem port flow control.

Command

Function

» \G0

Flow control disabled.

\G1

Flow control enabled.

FLOW CONTROL DISPLAY

Format

AT [cmds] S39? [cmds]

Example:

ATS39?<CR>

Default:

Read-only

Range:

0, 3 - 6

Unit:

None

Stored:

N/A

Description:

Contains the current flow control.

Value

Meaning

0

Flow control is disabled.

» 3

RTS/CTS flow control is enabled.

4

XON/XOFF flow control is enabled.

5

AFT XON/XOFF flow control is enabled.

6

RTS/CTS and XON/XOFF flow control enabled.

FLOW CONTROL CHARACTER - XOFF

Type:

Register

Format:

AT [cmds] S33=n [cmds]

Example:

ATS33=20<CR>

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]

Example:

ATS32=20<CR>

Default:

17

Range:

0-255

Unit:

ASCII

Description:

Sets the character used to represent XON.

LEASED LINE RECEIVE LEVEL DISPLAY

Type:

Immediate

Format:

AT [cmds] %L [cmds] l

Example:

AT %L &W<CR>

Description:

Displays signal level for reception when in leased-line mode.

MAXIMUM BLOCK SIZE FOR TRANSMISSION

Type:

Configuration

Format:

AT [cmds] \An [cmds]

Example:

AT \A3 %C1<CR>

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.

MNP STREAM/BLOCK MODE

Type:

Configuration

Format:

AT [cmds] \Ln [cmds]

Example:

AT \L1 DT555-1212<CR>

Description:

Selects the transfer mode for MNP.

Command

Function

» \L0

Stream mode for MNP enabled.

\L1

Block mode for MNP enabled.

NEGOTIATE LINE SPEED

Type:

Configuration

Format:

AT [cmds] %Q [cmds]

Example:

AT %Q &W<CR>

Description:

Displays signal quality.

SLEEP TIMER

Format

AT [cmds] S24=n [cmds]

Example:

ATS24=40<CR>

Default:

0

Range:

0 - 255

Unit:

1 second

Description:

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