Summary of AT Commands. Black Box MD1641A, MD1640A

SERIES II INTELLIGENT DATA/FAX MODEMS

HANG

UP

COMMAND

MODE

+++AT

Dial ( D or A ) command, or incoming phone call no carrier detected carrier lost

WAIT FOR

CARRIER carrier detected

ON-LINE

MODE

AT0 command

Figure 5-1. Functional Modes

46

5.2 Summary of AT Commands

A wide variety of autodial operations and modem options can be controlled when the Series II Modem is in Command Mode. Remember, nearly all commands begin with AT .

These commands are organized into several functional groups. An alphabetical summary of commands is provided in Appendix D.

HOW TO COMMANDS

DIAL

MODIFY DIALING P/T

PROCEDURES &P

,

Y

W

D Dial

A: or : Continuous Redial

$D DTR Dialing

$VD Voice/Data Dialing

N Dial a Stored Number

Pulse/Tone Dialing

Set Pulse Dial Ratios

Automatic Pauses in dialing

Long Space Disconnect

Wait for New Dial Tone

;

R

!

$

@

MEMORIZE PHONE

NUMBERS D...N

NN

L

STORE MODEM &F

CONFIGURATIONS &W

AND DEFAULTS

Z

$SP

# V

&M

CONFIGURE

COMMAND

RESPONSES

&X

Q

&Q

E

V

X

CONDITION

PHONE LINE

AND MODEM

HARDWARE

CHAPTER 5: Command Mode

Return to Command Mode After Dial

Command

Reverse Mode of Operation

Flash On Hook

AT&T "Calling Card" Tones

Quiet Answer

&G

M

&T

#T

#F

$FC

&CD

#A

Store Phone Numbers

Number Linking

List Numbers Stored in Memory

Load Factory Defaults

Store Configuration & S-Register

Parameters

Reset Modem

UNIX/"Spoofing”

336 (MD1641A) only: Enable/Disable

V.32terbo

Synchronous/Asynchronous Mode

Select

Synchronous Transmit Clock Select

Result Codes Enable/Disable

Response

Result Code Selection

Echo Command Characters

Result Code Terse/Verbose

Result Code...Basic/Extended/Call

Progress

Guard Tones

Enable/Disable Monitor Speaker

Remote Digital Loop Signal

Enable/Disable Trellis Coded

Modulation

Fallback When On-Line

336+ (MD1640A) only: Enable/Disable

Lowspeed Fast Connect

Cleardown at Disconnect

Auto-Speed Detect

47

SERIES II INTELLIGENT DATA/FAX MODEMS

CONTROL RS232C

INTERFACE &D

CONFIGURE

ERROR

CORRECTION

CONFIGURE

FLOW CONTROL

&C

&R

&S

&RF

&SF

&E0

&E1

&E2

#L0

#L1

#L2

#L3

$A

$F

$R

$E

Carrier Detect Control

Data Terminal Ready Control

Clear To Send Control

Data Set Ready Control

CTS/RTS Control

DSR/CD Control

Normal Mode

Auto-Reliable Mode

Reliable Mode

Negotiate V.42 Mode During

Handshake

MNP On/LAPM Off

LAPM On/MNP Off

Direct LAPM/Phase Out Handshake

Auto-Reliable Buffering

Enable/Disable Auto-Reliable

Fallback Character

Retransmit Count

Error Correction at 300 bps

&E3

&E4

&E5

Flow Control Disabled

Hardware Flow Control

Xon/Xoff Modem-Initiated

&E6

&E7

#X

Xon/Xoff Modem Responds/No Pass-

Through

Xon/Xoff Modem Responds/Pass-

Through Allowed

Send Single/Multiple Xoff Characters

&E8

&E9

Enq/Ack Off

Enq/Ack On

&E10 Normal Mode Modem Flow Control

Off

&E11 Normal Mode Modem Flow Control

On

&E12 Computer-Initiated/Off

&E13 Computer-Initiated/On

&BS Maximum Block Size

48

CHAPTER 5: Command Mode

$EB

#P

336 (MD1641A) only: 10/11-Bit

Asynchronous Format

Parity Selection

CONFIGURE DATA &E14 Data Compression Disabled

COMPRESSION &E15 Data Compression Enabled

CONFIGURE SPEED $BA0 Speed Conversion On

CONVERSION $BA1

$MB

Speed Conversion Off

Set modem speed (e.g., $MB33600)

$SB Set serial port speed

(e.g., $SB115200)

EXECUTE

IMMEDIATE I

$H Help

Product Code Inquiry

COMMANDS

EXECUTE

LINE

PROBE

COMMANDS

L5

L6

List Current Operating Parameters

List S-Register Values

L7

L8

List additional Configuration

Parameters

List On-Line Diagnostics

H Off Hook

+++AT<CR>

%E

A

O

Escape Sequence: Entering

Command Mode while On-Line

Escape Sequence Options...Entering

Command Mode while On-Line

Force Answer Mode

Exit Command Mode/Go Back On-

Line

%DF Format Line Probe Display (Graph or

Table Format)

%DP Enable/Disable Reading Line Probe

L9 Display of Signal Strength

Information

L10

L11

Display Signal to Noise Ratio (SNR)

Display of Noise Information

&RP Initiates Retrain to Read Line Probe

Parameters

49