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POWER 28.8 DATA/FAX MODEM

MOTOROLA, INC.

POWER 28.8 DATA/FAX MODEM

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

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

   

FACTORY RESET

Mode

SW2

Normal operation

On

NVRAM clear

Off

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

MR

Red

On

Power is on

MR

Red

Off

Power is off

MR

Red

Blinking

Modem is performing self-test

TR

Red

On

DTR signal is high

TR

Red

Off

DTR signal is low

CD

Red

On

Carrier signal detected

CD

Red

Off

Carrier signal not detected

CD

Red

Blinking

Modem is being configured remotely

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

AA

Red

On

Auto-answer enabled

AA

Red

Off

Auto-answer disabled

AA

Red

Blinking

Phone is ringing

OH

Red

On

Modem is off-hook

OH

Red

Off

Modem is on-hook

HS

Red

On

Modem is operating at 16.8Kbps or faster

HS

Red

Off

Modem is operating between 4800bps and 14.4Kbps

HS

Red

Blinking

Modem is operating at 2400bps or slower

Proprietary AT Command Set

AUTO-RELIABLE FALLBACK CHARACTER

Type:

Register

Format:

AT [cmds] %An [cmds]

Example:

AT%A20<CR>

Default:

0

Range:

0-127

Unit:

ASCII

Description:

Sets the character used as the auto-reliable fallback character. %A0 will disable this function.

AUTO-RELIABLE TIME BUFFER CONFIGURATION

Type:

Configuration

Format:

AT [cmds] \Cn [cmds]

Example:

AT \C1 &W<CR>

Description:

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

Command

Function

» \C0

Data is discarded.

\C1

Data is buffered.

BREAK TYPE

Type:

Configuration

Format:

AT [cmds] \Kn [cmds]

Example:

AT \K1 <CR>

Description:

Configures action of break signal.

Command

Function

\K1

Buffers cleared and break sent to remote modem.

\K3

Send break to remote modem immediately.

\K5

Send break with transmitted data.

BREAK SEND

Type:

Configuration

Format:

AT [cmds] \Bn [cmds]

Example:

AT \B50 O<CR>

Default:

35

Range:

1-255

Unit:

20ms

Description:

Sends break to modem.

CALLER ID

Type:

Configuration

Format:

AT [cmds] *IDn [cmds]

Example:

AT *ID1<CR>

Description:

Controls the Caller ID function.

Command

Function

» *ID0

Caller ID disabled.

*ID1

Caller ID enabled.

CD SIGNAL

Type:

Configuration

Format:

AT [cmds] &Cn [cmds]

Example:

AT &C3 *RS1 *SR1<CR>

Description:

Configures the behavior of the carrier detect signal.

Command

Function

&C0

CD forced high.

» &C1

CD normal.

&C2

CD forced high except during disconnect.

&C3

CD follows remote RTS signal.

COMMAND SET

Type:

Configuration

Format:

AT [cmds] *NTn [cmds]

Example:

AT *NT0<CR>

Description:

Disables the AT command set.

Note:

To re-enable the command set, power down the modem and then cycle power seven times. The modem must remain powered on each time at least one second but not more than five.

Command

Function

*NT0

Command set disabled.

» *NT1

Command set enabled.

COMPRESSION

Type:

Configuration

Format:

AT %Cn

Example:

AT *EC0 %C1 *AP0<CR>

Description:

Selects data compression.

Command

Function

%C0

Data compression disabled.

» %C1

Data compression 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.

\N6

LAP-M mode with fallback to MNP enabled.

» \N7

LAP-M mode with fallback to MNP and normal modes enabled.

CONNECTION SPEED LOWER LIMIT

Type:

Configuration

Format:

AT [cmds] %Ln [cmds]

Example:

AT %L3 %B14 \J0<CR>

Description:

Sets slowest allowed connection speed.

Command

Function

» %L0

Disabled.

%L2

Select 1200bps minimum speed.

%L3

Select 2400bps minimum speed.

%L4

Select 4800bps minimum speed.

%L5

Select 9600bps uncoded minimum speed.

%L6

Select 9600bps minimum speed.

%L7

Select 7200bps minimum speed.

%L8

Select 12Kbps minimum speed.

%L9

Select 14.4Kbps minimum speed.

%L10

Select 600bps minimum speed.

%L11

Select 16.8Kbps minimum speed.

%L12

Select 19.2Kbps minimum speed.

%L13

Select 21.6Kbps minimum speed.

%L14

Select 24Kbps minimum speed.

%L15

Select 26.4Kbps minimum speed.

%L16

Select 28.8Kbps minimum speed.

CONNECTION SPEED UPPER LIMIT

Type:

Configuration

Format:

AT [cmds] %Bn [cmds]

Example:

AT %L3 %B14 \J0<CR>

Description:

Sets fastest allowed connection speed.

Command

Function

%B0

Follow serial port speed.

%B1

Select 300bps maximum speed.

%B2

Select 1200bps maximum speed.

%B3

Select 2400bps maximum speed.

%B4

Select 4800bps maximum speed.

%B5

Select 9600bps uncoded maximum speed.

%B6

Select 9600bps maximum speed.

%B7

Select 7200bps maximum speed.

%B8

Select 12Kbps maximum speed.

» %B9

Select 14.4Kbps maximum speed.

%B10

Select 600bps maximum speed.

%B11

Select 16.8Kbps maximum speed.

%B12

Select 19.2Kbps maximum speed.

%B13

Select 21.6Kbps maximum speed.

%B14

Select 24Kbps maximum speed.

%B15

Select 26.4Kbps maximum speed.

%B16

Select 28.8Kbps maximum speed.

CTS SIGNAL

Type:

Configuration

Format:

AT [cmds] &Rn [cmds]

Example:

AT &R0<CR>

Description:

Selects the function of the CTS signal.

Command

Function

&R0

CTS normal.

» &R1

CTS forced high.

&R2

CTS follows CD.

&R9

CTS follows RTS.

DISCONNECT BUFFER DELAY

Type:

Configuration

Format:

AT [cmds] %Dn [cmds]

Example:

AT %D0<CR>

Default:

0

Range:

0-255

Unit:

1 minute

Description:

Configures how long the modem will wait to disconnect if there is data in the transmit or receive buffers.

DISPLAY STORED NUMBERS

Type:

Immediate

Format:

AT [cmds] *ND [cmds]

Example:

AT*CN3,555-1212 *ND<CR>

Description:

Displays all stored phone numbers.

DSR SIGNAL

Type:

Configuration

Format:

AT [cmds] &Sn [cmds]

Example:

AT &S0<CR>

Description:

Selects the function of the DSR signal.

Command

Function

» &S0

DSR forced high.

&S1

DSR normal.

&S2

DSR normal, except forced low on disconnect.

&S3

DSR follows OH.

DTR SIGNAL

Type:

Configuration

Format:

AT [cmds] &Dn [cmds]

Example:

AT &D1<CR>

Description:

Configures the behavior of the Data Terminal Ready signal.

Command

Function

&D0

DTR forced high.

&D1

Modem will enter command mode on low DTR.

» &D2

Modem will disconnect on low DTR.

&D3

Modem will disconnect and reset on low DTR.

&D9

DTR dialing enabled.

EXTENDED RESULT CODES

Type:

Configuration

Format:

AT [cmds] \Vn [cmds]

Example:

AT \V1 %C1<CR>

Description:

Selects extended result codes.

Command

Function

\V0

Extended result codes disabled, DTE speed reported.

\V1

Protocol result codes enabled, DTE speed reported.

\V2

Extended result codes disabled, DCE speed reported.

\V3

Protocol result codes enabled, DCE speed reported.

» \V4

Protocol and modulation result codes enabled, DCE speed reported.

FLOW CONTROL

Type:

Configuration

Format:

AT [cmds] \Gn [cmds]

Example:

AT G1 &M0<CR>

Description:

Selects modem port flow control.

Command

Function

» \G0

Flow control disabled.

\G1

Flow control enabled.

FLOW CONTROL CHARACTER - XOFF FROM TERMINAL

Type:

Register

Format:

AT [cmds] S45=n [cmds]

Example:

ATS45=22<CR>

Default:

19

Range:

0-127

Unit:

ASCII

Description:

Sets the character the terminal sends to represent XOFF.

FLOW CONTROL CHARACTER - XON FROM TERMINAL

Type:

Register

Format:

AT [cmds] S44=n [cmds]

Example:

ATS44=20<CR>

Default:

17

Range:

0-127

Unit:

ASCII

Description:

Sets the character the terminal sends to represent XON.

FLOW CONTROL CHARACTER - XOFF TO TERMINAL

Type:

Register

Format:

AT [cmds] S50=n [cmds]

Example:

ATS50=23<CR>

Default:

19

Range:

0-127

Unit:

ASCII

Description:

Sets the character the modem sends to represent XOFF.

FLOW CONTROL CHARACTER - XON TO TERMINAL

Type:

Register

Format:

AT [cmds] S49=n [cmds]

Example:

ATS49=21<CR>

Default:

17

Range:

0-127

Unit:

ASCII

Description:

Sets the character the modem sends to represent XON.

FLOW CONTROL TYPE

Type:

Configuration

Format:

AT [cmds] \Qn [cmds]

Example:

AT \Q5<CR>

Description:

Sets type of flow control used by modem.

Command

Function

\Q0

Flow control disabled.

\Q1

Bidirectional XON/XOFF flow control enabled.

\Q2

CTS flow control by DCE enabled.

» \Q3

Bidirectional CTS/RTS flow control enabled.

FORCE RETRAIN

Type:

Immediate

Format:

AT [cmds] *RRn [cmds]

Example:

AT *RR14 O<CR>

Description:

Forces the modem to attempt to retrain to the selected speed.

Command

Function

*RR0

Attempt 2400bps speed.

*RR1

Attempt 4800bps speed.

*RR2

Attempt 7200bps speed.

*RR3

Attempt 9600bps speed.

*RR4

Attempt 12Kbps speed.

*RR5

Attempt 14.4Kbps speed.

*RR6

Attempt 16.8Kbps speed.

*RR7

Attempt 19.2Kbps speed.

*RR8

Attempt 21.6Kbps speed.

*RR9

Attempt 24Kbps speed.

*RR10

Attempt 26.4Kbps speed.

*RR11

Attempt 28.8Kbps speed.

HANG UP MODE

Type:

Configuration

Format:

AT [cmds] Hn [cmds]

Example:

AT H3 O<CR>

Description:

Selects how the modem will hang up.

Command

Function

» H2

Set hang up mode to normal on next ATH command.

H3

Set hang up mode to fast on next ATH command.

HELP SCREENS

Type:

Immediate

Format:

AT $H=xxxx

Example:

AT $H=MNP<CR>

Description:

Shows modem help screens. If a string is included as shown in the example, the modem will perform a search for the string; otherwise, the whole help section will be displayed.

INACTIVITY TIMER

Type:

Register

Format:

AT [cmds] \Tn [cmds]

Example:

AT\T20<CR>

Default:

0

Range:

0-255

Unit:

1 minute

Description:

Sets the length of time that the modem does not receive information before it disconnects.

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.

PROTOCOL/SPEED

Type:

Configuration

Format:

AT [cmds] *MMn [cmds]

Example:

AT *MN6 *MX14 *MM11<CR>

Description:

Selects the current protocol.

Command

Function

*MM0

Selects all protocols.

*MM1

Selects V.21 only.

*MM2

Selects Bell 103 only.

*MM3

Selects V.23 only.

*MM4

Selects Bell 212 only.

*MM5

Selects V.22bis only.

*MM11

Selects V.32bis only.

*MM12

Selects V.34 only.

REDIAL DISABLE

Type:

Configuration

Format:

AT [cmds] *DNn [cmds]

Example:

AT *DN1<CR>

Description:

Disables the ability to redial the last number with A/.

Command

Function

» *DN0

A/ enabled.

*DN1

A/ disabled.

REMOTE CONFIGURATION END

Type:

Configuration

Format:

AT [cmds] *RQn [cmds]

Example:

AT *RQ0 D555-1212<CR>

Description:

Ends an active remote configuration session.

Command

Function

*RQ0

Quit and save changes.

*RQ1

Quit and discard changes.

REMOTE CONFIGURATION PARITY

Type:

Configuration

Format:

AT [cmds] *RFn [cmds]

Example:

AT *RB16 *RF5<CR>

Description:

Sets remote computer’s parity in remote configuration mode.

Command

Function

*RF0

Use 7 data bits, MARK parity, and one stop bit.

*RF1

Use 7 data bits, no parity, and two stop bits.

*RF2

Use 7 data bits, odd parity, and one stop bit.

*RF3

Use 7 data bits, even parity, and one stop bit.

*RF4

Use 8 data bits, MARK parity, and one stop bit.

*RF5

Use 8 data bits, no parity, and one stop bit.

*RF6

Use 8 data bits, odd parity, and one stop bit.

*RF7

Use 8 data bits, even parity, and one stop bit.

REMOTE CONFIGURATION PASSWORD

Type:

Configuration

Format:

AT [cmds] %P=nnnn [cmds]

Example:

AT %P=102475 D555-1212<CR>

Default:

N/A

Range:

0-99999999, D, <none>

Description:

Sets the security code for remote configuration sessions. If nnnn is omitted, the code will be cleared; if a D is given, remote configuration is disabled.

REMOTE CONFIGURATION PERMISSION

Type:

Configuration

Format:

AT [cmds] *RAn [cmds]

Example:

AT *RA0 D555-1212<CR>

Description:

Selects whether remote modems may configure the local modem.

Command

Function

*RA0

Remote configuration requests will be denied.

*RA1

Remote configuration requests will be allowed.

REMOTE CONFIGURATION SERIAL PORT SPEED

Type:

Configuration

Format:

AT [cmds] *RBn [cmds]

Example:

AT *RB16 *RF5<CR>

Description:

Sets remote computer’s serial port speed in remote configuration mode.

Command

Function

*RB0

Sets 300bps speed.

*RB1

Sets 600bps speed.

*RB2

Sets 1200bps speed.

*RB3

Sets 2400bps speed.

*RB4

Sets 4800bps speed.

*RB5

Sets 7200bps speed.

*RB6

Sets 9600bps speed.

*RB7

Sets 12Kbps speed.

*RB8

Sets 14.4Kbps speed.

*RB9

Sets 16.8Kbps speed.

*RB10

Sets 19.2Kbps speed.

*RB11

Sets 21.6Kbps speed.

*RB12

Sets 24Kbps speed.

*RB13

Sets 26.4Kbps speed.

*RB14

Sets 28.8Kbps speed.

*RB15

Sets 38.4Kbps speed.

*RB16

Sets 57.6Kbps speed.

*RB17

Sets 115.2Kbps speed.

REPORT INFORMATION

Type:

Immediate

Format:

AT [cmds] In [cmds]

Example:

AT I3 &V1 %V<CR>

Description:

Displays modem properties.

Command

Function

I0

Reports modem model and speed.

I1

Reports checksum number.

I3

Reports firmware version.

I4

Reports feature code.

I5

Reports reason for last disconnect.

REPORT INFORMATION AND CONFIGURATION PROFILE

Type:

Immediate

Format:

AT [cmds] &Vn [cmds]

Example:

AT I3 &V1 %V<CR>

Description:

Reports configuration profiles and other information.

Command

Function

&V0

Report configuration profiles.

&V1

Report connection status and internal modem information.

&V2

Report active configuration profile.

REPORT PRODUCT VERSION

Type:

Immediate

Format:

AT [cmds] %V [cmds]

Example:

AT I3 &V1 %V<CR>

Description:

Reports product version.

REPORT SERIAL NUMBER

Type:

Immediate

Format:

AT [cmds] $V [cmds]

Example:

AT I3 &V1 $V<CR>

Description:

Reports product serial number.

RETRAIN SENSITIVITY

Type:

Configuration

Format:

AT [cmds] %Rn [cmds]

Example:

AT &C3 %R1<CR>

Description:

Sets how poor line conditions must be before the modem will initiate a retrain.

Command

Function

» %R0

Modem will not initiate retrain.

%R1

Modem will initiate retrain when the Bit Error Rate exceeds 10-5 for eight seconds, or for one second in V.22bis mode.

%R2

Modem will initiate retrain when the Bit Error Rate exceeds 10-4 for eight seconds, or for one second in V.22bis mode.

%R3

Modem will initiate retrain when the Bit Error Rate exceeds 10-3 for eight seconds, or for one second in V.22bis mode.

RI SIGNAL

Type:

Configuration

Format:

AT [cmds] \Rn [cmds]

Example:

AT \R0 Q0<CR>

Description:

Controls the behavior of the Ring Indicator signal.

Command

Function

\R0

RI signal high during rings, and forced high for duration of call.

» \R1

RI signal high during rings only.

SECURITY - CALLBACK DELAY

Type:

Register

Format:

AT [cmds] S74=n [cmds]

Example:

AT S74=30<CR>

Default:

15

Range:

0-255

Unit:

1 second

Description:

Configures how long the modem will wait to execute a callback sequence after the user has disconnected.

SECURITY - CALLBACK NUMBER

Type:

Configuration

Format:

AT [cmds] $Cn=<#> [cmds]

Example:

AT $L0=3 $C0=1(303)443-3388<CR>

Description:

Sets the callback number for user number n.

SECURITY - CALLBACK RETRY

Type:

Register

Format:

AT [cmds] S75=n [cmds]

Example:

AT S75=5<CR>

Default:

0

Range:

0-255

Unit:

1 redial

Description:

Sets how many times the modem will attempt to execute a callback if the first call fails.

SECURITY - CALLBACK RETRY DELAY

Type:

Register

Format:

AT [cmds] S76=n [cmds]

Example:

AT S76=60<CR>

Default:

15

Range:

0-255

Unit:

1 second

Description:

Configures how long the modem will wait to execute another callback sequence after one has failed.

SECURITY CHECK

Type:

Immediate

Format:

AT [cmds] $D? [cmds]

AT [cmds] $E? [cmds]

Example:

AT $DR $D?<CR>

Description:

Reports whether security is enabled.

SECURITY DISABLE

Type:

Immediate

Format:

AT [cmds] $D=xxxx

Example:

AT $D=MicroHouse<CR>

Description:

Disables security. A password must be specified.

SECURITY ENABLE

Type:

Immediate

Format:

AT [cmds] $EH=xxxx

Example:

AT $EH=SuperSecret<CR>

Description:

Enables security. The superuser password must be specified.

SECURITY - DELETE USER

Type:

Configuration

Format:

AT [cmds] $Rn [cmds]

Example:

AT $R3<CR>

Description:

Deletes the user number n. User IDs 0 and 1 cannot be deleted.

SECURITY - FAILED LOGIN ATTEMPT COUNTERS

Type:

Configuration/Immediate

Format:

AT [cmds] $Mn [cmds]

Example:

AT $M $M*<CR>

Description:

Displays or clears the counters for failed login attempts. If a number is specified, the counter will be reset for that user. If an * follows, all counters will be cleared. If no character follows, the counters will be displayed.

SECURITY - FAILED LOGIN ATTEMPT MAXIMUM

Type:

Register

Format:

AT [cmds] S77=n [cmds]

Example:

AT S77=3<CR>

Default:

0

Range:

0-255

Unit:

1 attempt

Description:

Sets the maximum number of failed logins the modem will accept until it disconnects.

SECURITY LEVEL

Type:

Configuration

Format:

AT [cmds] $Lm=n [cmds]

Example:

AT $L0=3 $C0=1(303)443-3388<CR>

Description:

Sets the security level for user number m.

Command

Function

$Lm=1

Modem prompts for a user ID and password on connection.

$Lm=2

Modem prompts for a user ID and password on connection, then modem begins callback sequence.

$Lm=3

Modem prompts for a user ID and password on connection, then modem begins callback sequence. When modem reconnects, it prompts for a user ID and password again.

SECURITY LOGIN

Type:

Immediate

Format:

AT [cmds] $n=xxxx [cmds]

Example:

AT $1=MicroHouse<CR>

Description:

Logs into modem, from the local machine or remotely.

SECURITY LOGOUT

Type:

Immediate

Format:

AT [cmds] $$ [cmds]

Example:

AT $$<CR>

Description:

Logs out from the modem.

SECURITY PASSWORD

Type:

Configuration

Format:

AT [cmds] $Pn=xxxx$xxxx

Example:

AT $P0=SuperSecret$SuperSecret<CR>

Description:

Sets the password for user number n to xxxx. User number 0 is the superuser. The password must be between 4 and 34 characters inclusive. The $ character may not be used.

SECURITY - PASSWORD TIME

Type:

Register

Format:

AT [cmds] S73=n [cmds]

Example:

AT S73=10<CR>

Default:

Unidentified

Range:

0-255

Unit:

1 second

Description:

Configures how long the modem will wait for a password when in secure mode.

SECURITY - REPORT SUPERUSER STATUS

Type:

Immediate

Format:

AT [cmds] $Sn? [cmds]

Example:

AT $S3?<CR>

Description:

Reports whether user n has superuser status.

SECURITY - REPORT USER SETTINGS

Type:

Immediate

Format:

AT [cmds] $In [cmds]

Example:

AT $I3<CR>

Description:

Reports security level and callback number for user n.

SECURITY RESET

Type:

Configuration

Format:

AT [cmds] $F=xxxx$xxxx

Example:

AT $F=SuperSecret$SuperSecret<CR>

Description:

Resets the high security options to their factory defaults.

SECURITY - SUPERUSER MODE

Type:

Immediate

Format:

AT [cmds] $S=xxxx [cmds]

Example:

AT $S=SuperSecret<CR>

Description:

Attempts to enter superuser mode.

STATUS REGISTER HEXADECIMAL

Type:

Configuration

Format:

Write: AT [cmds] Sn=^hh [cmds]

Read: AT [cmds] Sn?^ [cmds]

Example:

AT S99=^3F S99?^<CR>

Description:

Sets register n to hexadecimal number hh or displays register n in hexadecimal.

SWITCHED LINE TRANSMISSION LEVEL

Type:

Configuration

Format:

AT [cmds] *TDn [cmds]

Example:

AT *TD15<CR>

Default:

9

Range:

9 - 30

Unit:

-1 dBm

Description:

Sets the signal level for transmission when in switched line mode.

TEST MODE - BIDIRECTIONAL DIGITAL LOOPBACK TEST

Type:

Configuration

Format:

AT [cmds] *DGn [cmds]

Example:

AT *DG1<CR>

Description:

Controls the bidirectional local digital loopback test mode.

Command

Function

» *DG0

End loopback test.

*DG1

Begin loopback test.

V.32 HANDSHAKE OPTIONS

Type:

Configuration

Format:

AT [cmds] *FTn [cmds]

Example:

AT *FT0<CR>

Description:

Shortens V.32 and V.32bis handshake time.

Command

Function

» *FT0

Normal handshake sequence.

*FT1

Training time is shortened by 2 seconds in V.32 and V.32bis modes.

V.34 RETRAIN SENSITIVITY

Type:

Configuration

Format:

AT [cmds] *THn [cmds]

Example:

AT *MM12 *TH1<CR>

Description:

Sets how poor line conditions must be before the modem will initiate a retrain when in V.34 mode.

Command

Function

*TH0

Modem will initiate retrain when the Bit Error Rate exceeds 10-6.

*TH1

Modem will initiate retrain when the Bit Error Rate exceeds 10-4.

» *TH2

Modem will initiate retrain when the Bit Error Rate exceeds 10-2.

V.34 SPLIT BAUD MODE

Type:

Configuration

Format:

AT [cmds] *ASn [cmds]

Example:

AT *AS1 <CR>

Description:

Controls V.34 split baud mode.

Command

Function

*AS0

V.34 split baud mode disabled.

» *AS1

V.34 split baud mode enabled.

V.42 NEGOTIATION MODE

Type:

Configuration

Format:

AT [cmds] \Mn [cmds]

Example:

AT \M0 H1 DT555-1212<CR>

Description:

Selects how the modem negotiates V.42 modulation during handshaking.

Command

Function

\M0

Normal handshaking enabled.

\M1

Fast handshaking enabled.

XON/XOFF PASS-THROUGH

Type:

Configuration

Format:

AT [cmds] \Xn [cmds]

Example:

AT \X7 O<CR>

Description:

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

Command

Function

» \X0

XON/XOFF signals trapped by local modem.

\X1

XON/XOFF passed through local modem.