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MT2834ZDX/MT2834ZDXI/MT2834ZDXK

MULTITECH SYSTEMS, INC.

MT2834ZDX/MT2834ZDXI/MT2834ZDXK

Modem Type

Data (synchronous/asynchronous)/Fax

Maximum Data Rate

28.8Kbps

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, V.34

AT&T V.32terbo

Fax Modulation Protocol

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

Error Correction/Compression

MNP2-5, V.42, V.42bis

Proprietary Command Set

ANSWER-BACK

Type:

Configuration

Format:

AT [cmds] &An [cmds]

Example:

AT &A1<CR>

Description:

Controls the modem’s ability to respond with its identification.

Command

Function

» &A0

Disables answer-back.

&A1

Enables answer-back.

AUTO-RELIABLE TIME BUFFER CONFIGURATION

Type:

Configuration

Format:

AT [cmds] $An [cmds]

Example:

AT $A1 &W<CR>

Description:

Controls the handling of incoming data during auto-reliable time period.

Command

Function

» $A0

Data is discarded.x

$A1

Data is buffered.

BIT MODE

Type:

Configuration

Format:

AT [cmds] $EBn [cmds]

Example:

AT $EB1 E1<CR>

Description:

Selects 10- or 11-bit mode.

Command

Function

» $EB0

Sets 10-bit mode.

$EB1

Sets 11-bit mode.

CARRIER MODE

Type:

Configuration

Format:

AT [cmds] &Cn [cmds]

Example:

AT &C0 A<CR>

Description:

Sets the function of the Carrier Detect (CD) signal.

Command

Function

&C0

Forces CD high.

» &C1

CD signal follows carrier.

&C2

Forces CD low for time in S24 when the modem disconnects.

&C4

Resets modem when CD goes low.

COMMAND ESCAPE TYPE

Type:

Configuration

Format:

AT [cmds] %En [cmds]

Example:

AT %E3 &W<CR>

Description:

Sets type and response of command escape sequence.

Command

Function

%E0

Command escape disabled.

» %E1

TIES escape (+++AT...)

%E2

<BREAK>AT method.

%E3

Both TIES and BREAK methods.

%E4

OK response to command escape disabled.

%E5

OK response to command escape enabled.

COMMAND SET

Type:

Configuration

Format:

AT &Qn

Example:

AT &Q1<CR>

Description:

Selects standard Hayes or custom command sets.

Command

Function

» &Q0

Multi-Tech custom command set enabled.

&Q1

Standard Hayes command set enabled.

COMPRESSION

Type:

Configuration

Format:

AT &En

Example:

AT &E15 #L0<CR>

Description:

Selects data compression.

Command

Function

&E14

Data compression disabled.

» &E15

Data compression enabled.

COMPRESSION MODE

Type:

Configuration

Format:

AT #Ln

Example:

AT #L2 DT555-1212<CR>

Description:

Selects active compression protocols.

Command

Function

» #L0

V.42 negotiation enabled.

#L1

MNP negotiation enabled.

#L2

LAP-M negotiation enabled.

#L3

LAP-M enabled, no negotiation.

CTS SIGNAL

Type:

Configuration

Format:

AT [cmds] &RFn [cmds]

Example:

AT &RF0<CR>

Description:

Selects the function of the CTS signal.

Command

Function

&RF0

CTS is set to RTS.

» &RF1

CTS is independent of RTS.

DIAL STORED PHONE NUMBER

Type:

Immediate

Format:

AT [cmds] Nn1 [Nn2, Nn3...]

Example:

ATM0 N1N3N5<CR>

Description:

Dials stored phone number(s). If the first number is busy, the modem will proceed to the next number in the list.

DSR SIGNAL

Type:

Configuration

Format:

AT [cmds] &SFn [cmds]

Example:

AT &SF0<CR>

Description:

Selects the function of the DSR signal.

Command

Function

» &SF0

DSR is set to CD.

&SF1

DSR is independent of CD.

DTR DIALING

Type:

Configuration

Format:

AT [cmds] $Dn [cmds]

Example:

AT $D1 DT555-1212<CR>

Description:

Turns DTR dialing on and off.

Command

Function

» $D0

DTR dialing disabled.

$D1

DTR dialing enabled.

DTR MODE

Type:

Configuration

Format:

AT [cmds] &Dn [cmds]

Example:

AT &D1<CR>

Description:

Sets the function of the DTR signal.

Command

Function

&D0

DTR is ignored.

&D1

Modem returns to command mode on high DTR.

» &D2

DTR normal operation.

&D3

Modem resets on high DTR.

DTR TIMEOUT

Type:

Register

Format:

AT [cmds] S24=n [cmds]

Example:

ATS24=40<CR>

Default:

20

Range:

0-255

Unit:

50 ms

Description:

Sets the time to drop the DTR signal to hangup.

ERASE CALLBACK NUMBER

Type:

Immediate

Format:

AT [cmds] #RDNn [cmds]

Example:

AT #RCBN05 #RDN05<CR>

Description:

Erases the callback phone number at the memory location specified.

ERROR CORRECTION DISABLE ON CONNECT

Type:

Configuration

Format:

AT [cmds] $Fn [cmds]

Example:

AT $F1 DT555-1212<CR>

Description:

Selects whether error correction can be disabled by a <CR> while handshaking.

Command

Function

$F0

Error correction handshake interrupt disabled.

» $F1

Error correction handshake interrupt enabled.

ESCAPE SEQUENCE BUFFER SIZE

Type:

Register

Format:

AT [cmds] S34=n [cmds]

Example:

ATS34=30<CR>

Default:

10

Range:

0-60

Unit:

1 byte

Description:

Sets the size of the buffer used to store commands during an escape sequence.

ESCAPE SEQUENCE - OUT OF BAND

Type:

Immediate

Format:

<BREAK> AT [cmds]<CR>

Example:

<BREAK> AT #F1<CR>

Description:

Puts the modem in Command Mode.

Notes:

Do not precede this command with AT.

<BREAK> refers to the hardware modem break signal.

ESCAPE SEQUENCE TIMEOUT

Type:

Register

Format:

AT [cmds] S32=n [cmds]

Example:

ATS32=30<CR>

Default:

20

Range:

0-255

Unit:

1 second

Description:

Sets the maximum amount of time the modem will wait for a <CR> while executing an escape sequence.

FALLBACK MODE

Type:

Configuration

Format:

AT [cmds] #Fn [cmds]

Example:

AT #F1 O<CR>

Description:

Sets direction of fallback.

Command

Function

#F0

Fallback disabled.

#F1

Fallback from 28.8Kbps to 4800bps as line quality degrades.

» #F2

Fallback from 4800bps to 28.8Kbps as line quality improves.

FLOW CONTROL NORMAL MODE

Type:

Configuration

Format:

AT [cmds] &En [cmds]

Example:

AT &E11 O<CR>

Description:

Selects normal flow control.

Command

Function

» &E10

Normal mode disabled.

&E11

Normal mode enabled.

FLOW CONTROL TYPE

Type:

Configuration

Format:

AT [cmds] &En [cmds]

Example:

AT &E4 &W<CR>

Description:

Sets type of flow control used by modem.

Command

Function

&E3

Flow control disabled.

» &E4

CTS/RTS flow control enabled.

&E5

XON/XOFF flow control enabled.

HANDSHAKE ATTEMPTS

Type:

Configuration

Format:

AT [cmds] #An [cmds]

Example:

AT #A1 #L3<CR>

Description:

Configures the initial handshake phase.

Command

Function

#A0

Attempts in order: 28.8Kbps, 24Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps, 12Kbps, 9600bps, 4800bps, 2400bps, 1200bps, 300bps.

#A1

Attempts only 14.4Kbps.

#A2

Attempts in order: 28.8Kbps, 24Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps, 12Kbps, 9600bps, 4800bps.

#A3

Attempts in order: 2400bps, 1200bps, 300bps.

HELP SCREENS

Type:

Immediate

Format:

AT $Hn

Example:

AT $H1<CR>

Description:

Shows modem help screens.

Command

Function

$H1

Shows help screen 1.

$H2

Shows help screen 2.

$H3

Shows help screen 3.

LIST CONFIGURATION

Type:

Immediate

Format:

AT Ln

Example:

AT L5<CR>

Description:

Lists modem configuration.

Command

Function

L5

Lists all settings.

L6

Lists the values of all S-registers.

L7

Lists extended parameters.

L8

Lists current diagnostics.

LOCAL SERIAL PORT SPEED

Type:

Configuration

Format:

AT [cmds] $SBnnn [cmds]

Example:

AT $MB9600 $SB19200<CR>

Description:

Sets serial port speed.

Command

Function

$SB300

Sets 300baud speed.

$SB1200

Sets 1200baud speed.

$SB2400

Sets 2400baud speed.

$SB4800

Sets 4800baud speed.

$SB9600

Sets 9600baud speed.

$SB19200

Sets 19.2Kbaud speed.

$SB38400

Sets 38.4Kbaud speed.

$SB57600

Sets 57.6Kbaud speed.

$SB115200

Sets 115.2Kbaud speed.

LOCK SERIAL PORT

Type:

Configuration

Format:

AT [cmds] $BAn [cmds]

Example:

AT $SB57600 $BA0<CR>

Description:

Sets operation of serial port speed.

Command

Function

» $BA0

Serial speed locked at rate set by $SB.

$BA1

Serial speed follows connect speed, ignoring $SB.

LOOPBACK

Type:

Configuration

Format:

AT [cmds] &Tn [cmds]

Example:

AT &T5<CR>

Description:

Enables or disables remote digital loopback response.

Command

Function

&T4

Loopback response enabled.

&T5

Loopback response disabled.

MAXIMUM BLOCK SIZE FOR TRANSMISSION

Type:

Configuration

Format:

AT [cmds] &BSn [cmds]

Example:

AT &BS1 &MB28800<CR>

Description:

Sets the maximum transmittable block size.

Command

Function

&BS0

Maximum block size is 64 characters.

» &BS1

Maximum block size is 128 characters for LAP-M, and 256 characters for MNP.

PACING

Type:

Configuration

Format:

AT [cmds] &En [cmds]

Example:

AT &E13<CR>

Description:

Selects ENQ/ACK pacing.

Command

Function

&E12

Disables ENQ/ACK pacing.

» &E13

Enables ENQ/ACK pacing.

PACING - ENQ/ACK

Type:

Configuration

Format:

AT [cmds] &En [cmds]

Example:

AT &E9<CR>

Description:

Selects ENQ/ACK pacing.

Command

Function

» &E8

Enables ENQ/ACK pacing.

&E9

Disables ENQ/ACK pacing.

REDIAL

Type:

Immediate

Format:

ATA:

Example:

ATA:<CR>

Description:

Redials the last number dialed until it is no longer busy.

REMOTE CONNECT SPEED

Type:

Configuration

Format:

AT $MBnnn

Example:

AT $MB9600 $SB19200<CR>

Description:

Sets maximum remote connect speed.

Command

Function

$MB300

Sets 300bps connect.

$MB1200

Sets 1200bps connect.

$MB2400

Sets 2400bps connect.

$MB4800

Sets 4800bps connect.

$MB9600

Sets 9600bps connect.

$MB14400

Sets 14.4Kbps connect.

$MB19200

Sets 19.2Kbps connect.

$MB28800

Sets 28.8Kbps connect.

RETRANSMIT FAIL ACTION

Type:

Configuration

Format:

AT [cmds] $Rn [cmds]

Example:

AT $R1<CR>

Description:

Sets whether the modem gives up on a bad connection.

Command

Function

» $R0

Hang up after 12 failed retransmissions.

$R1

Do not hang up after 12 failed retransmissions.

STORE PHONE NUMBER IN NVRAM

Type:

Configuration

Format:

AT [cmds] D<#>Nn [dialstring]

Example:

ATD555-1212N1<CR>

Description:

Stores a phone number in the modem’s memory.

TIME UNTIL HANG UP ON LOW DTR

Type:

Register

Format:

AT [cmds] S36=n [cmds]

Example:

ATS36=5<CR>

Default:

0

Range:

0-255

Unit:

1 second

Description:

Sets the maximum amount of time the modem will wait to hang up after the DTR signal goes low.

TIME UNTIL PICK UP ON HIGH DTR

Type:

Register

Format:

AT [cmds] S37=n [cmds]

Example:

ATS37=5<CR>

Default:

0

Range:

0-255

Unit:

1 second

Description:

Sets the maximum amount of time the modem will wait to pick up after the DTR signal goes high.

TRELLIS MODULATION

Type:

Configuration

Format:

AT [cmds] #Tn [cmds]

Example:

AT #T1<CR>

Description:

Controls Trellis Coded Modulation.

Command

Function

#T0

Disables TCM.

» #T1

Enables TCM.

V.42 MODE

Type:

Configuration

Format:

AT [cmds] &En [cmds]

Example:

AT &E0 <CR>

Description:

Configures the operation of V.42 mode.

Command

Function

&E0

Error correction disabled.

» &E1

V.42 set to auto-reliable.

&E2

V.42 set to reliable.

V.42 LOW SPEED

Type:

Configuration

Format:

AT [cmds] $En [cmds]

Example:

AT $E1 <CR>

Description:

Selects whether a V.42 connection will be attempted at 300bps.

Command

Function

» $E0

V.42 disabled at 300bps.

$E1

V.42 enabled at 300bps.

XOFF SEND

Type:

Configuration

Format:

AT [cmds] #Xn [cmds]

Example:

AT #X1<CR>

Description:

Selects how XOFF signal is sent.

Command

Function

» #X0

Single XOFF character sent until ready.

#X1

Multiple XOFF characters sent until ready.

XON/XOFF PASS-THROUGH

Type:

Configuration

Format:

AT [cmds] &En [cmds]

Example:

AT &E7 O<CR>

Description:

Selects whether XON/XOFF signals are sent to remote modem.

Command

Function

» &E6

XON/XOFF signals trapped by local modem.

&E7

XON/XOFF passed through local modem.