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VFD X

ZOOM TELEPHONICS, INC.

VFD X

Modem Type

Data (synchronous/asynchronous)/Fax/Voice

Maximum Data Rate

2400bps

Maximum Fax Rate

9600bps

Data Bus

External

Fax Class

Class I & II

Data Modulation Protocol

Unidentified

Fax Modulation Protocol

Unidentified

Error Correction/Compression

MNP5, V.42, V.42bis

CONNECTIONS

Purpose

Location

Purpose

Location

Line out

CN1

DC power

CN5

Line in

CN2

Speaker

CN6

Digital control (Proprietary

CN3

Power switch

SW1

RS-232/422

CN4

   

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

VM

Red

On/Blinking

Unread stored messages exist

VM

Red

Off

No unread stored messages exist

AA

Red

On

Auto-answer enabled

AA

Red

Off

Auto-answer disabled

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

RD

Red

Blinking

Modem is receiving data

RD

Red

Off

Modem is not receiving data

TD

Red

Blinking

Modem is transmitting data

TD

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.

BREAK SEND

Type:

Configuration

Format:

AT [cmds] \Bn [cmds]

Example:

AT \B3 &W<CR>

Range:

1-9

Default

3

Unit:

.1 second

Description:

Sends break to modem.

COMPRESSION

Type:

Configuration

Format:

AT %Cn

Example:

AT I2 %C1 &S0<CR>

Description:

Selects data compression.

Command

Function

%C0

Data compression disabled.

%C1

MNP5 enabled.

%C2

V.42bis enabled.

%C3

MNP5 and V.42bis enabled.

CONNECT MODE

Type:

Configuration

Format:

AT [cmds] \Nn [cmds]

Example:

AT \N1 DT555-1212<CR>

Description:

Sets connect mode.

Command

Function

\N1

Direct mode.

\N0

Normal mode.

\N2

Reliable mode.

\N3

Auto-reliable mode.

\N4

V.42 reliable mode.

\N5

MNP error correction mode.

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.

LINE SIGNAL LEVEL

Type:

Configuration

Format:

AT [cmds] %L [cmds]

Example:

AT %L &W<CR>

Unit:

-dBm

Description:

Returns received line signal level.

LOCK SERIAL PORT

Type:

Configuration

Format:

AT [cmds] \Jn [cmds]

Example:

AT %L3 %B14 \J0<CR>

Description:

Sets operation of serial port speed.

Command

Function

\J0

Serial speed locked.

\J1

Serial speed follows connect speed.

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.

REPORT SIGNAL QUALITY

Type:

Configuration

Format:

AT [cmds] %Q [cmds]

Example:

AT %Q &W<CR>

Description:

Reports signal quality.

REPORT MODEM STATUS

Type:

Immediate

Format:

AT [cmds] \S [cmds]

Example:

AT \S &W<CR>

Description:

Displays current modem configuration.