Multi-Tech Systems MT3334SMI User Manual

ModemModule

Model MT3334SMI Evaluation Kit

Data/Fax Socketed Modem

Developer ’s Guide

Developer’s Guide

88312201 Revision B

ModemModule (Model MT3334SMI)

Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.

Record of Revisions

Revision Description

A Manual released. All pages at revision A. (10/22/99)

B Added the &V command to the AT command set and added Appendix B which provides (12/10/99) instructions for developing a customized flash prgramming utility . All pages at revision B.

Patents

This Product is covered by one or more of the following U.S. Patent Numbers: 5.301.274; 5.309.562;

5.355.365; 5.355.653; 5.452.289; 5.453.986. Other Patents Pending.

Trademarks

Trademarks of Multi-Tech Systems, Inc. are ModemModule and the Multi-Tech logo. IBM is a registered trademark of International Business Machines Corporation.

Intel is a registered trademark of Intel Corporation. MNP and Microcom Network Protocol are registered trademarks of Microcom, Inc. Microsoft, Windows, Windows 95, and Windows NT are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.

Multi-Tech Systems, Inc.

2205 Woodale Drive

Mounds View , Minnesota 55112

(612) 785-3500 or (800) 328-9717

Fax 612-785-9874

Tech Support (800) 972-2439

Internet Address: http://www.multitech.com

Contents

Chapter 1 - Introduction and Description

Introduction .......................................................................................................................................................6

Product Description...........................................................................................................................................6

Features ............................................................................................................................................................6

T echnical Specifications....................................................................................................................................7

Physical Dimensions .........................................................................................................................................9

Test/Demo Board Specifications .....................................................................................................................10

Test/Demo Board Block Diagram.............................................................................................................. 11

MT3334SMI Pin-out ........................................................................................................................................12

Typical Application ....................................................................................................................................13

MT3334SMI Design Considerations................................................................................................................14

Hardware Considerations .........................................................................................................................14

PC Board Layout Considerations................................................................................................. .............15

MT3334SMI Placement ............................................................................................................................16

T elecom Labeling Requirements...............................................................................................................17

Chapter 2 - AT Commands, S-Registers, and Result Codes

Introduction .....................................................................................................................................................20

S-Registers .....................................................................................................................................................28

Result Codes................................................................................................................................................... 30

Chapter 3 - Class 1 Fax Commands

Introduction .....................................................................................................................................................32

Class 1 Fax Command Summary ............................................................................................................. 32

Chapter 4 - Class 2 Fax Commands

Introduction .....................................................................................................................................................42

Class 2 Fax Command Implementation....................................................................................................42

Class 2 Fax Commands (EIA SP-2388 August 1990)...............................................................................42

Chapter 5 - Remote Configuration

Introduction .....................................................................................................................................................52

Basic Procedure..............................................................................................................................................52

Setup ........................................................................................................................................................52

Chapter 6 - Troubleshooting

Introduction .....................................................................................................................................................56

Local Analog Loopback Test (V.54 Loop 3)...............................................................................................56

Remote Digital Loopback Test (V.54 Loop 2)............................................................................................57

Local Digital Loopback Test (V.54 Loop 2)................................................................................................58

Chapter 7 - Upgrade Procedure

Introduction .....................................................................................................................................................60

Upgrade Overview ..........................................................................................................................................60

Step 1: Identify the Modem Firmware .......................................................................................................60

Step 2: Identify the Current Firmware Version..........................................................................................60

Step 3: Download the Upgrade File ..........................................................................................................61

Step 4: Extract the Upgrade Files.............................................................................................................62

Step 5: Clear Your Stored Paramenters ...................................................................................................62

Step 6: Use FlashPro to Upgrade Modem Firmware ................................................................................62

Step 7: Restore Your Parameters .............................................................................................................62

iii

Appendixes

Appendix A - Regulatory Agency Compliance................................................................................................64

International Modem Restrictions .............................................................................................................65

EMC, Safety and Terminal Directive Compliance .................................................................................. ...66

European Directives User Guide Statement ............................................................................................. 66

New Zealand Telecom Warning Notice.....................................................................................................66

Appendix B - Multi-Tech Flash Programming Protocol...................................................................................67

Introduction ...............................................................................................................................................67

Intel Hex Format ....................................................................................................................................... 69

Index

Chapter 1 - Introduction and Description

ModemModule Developer’s Guide

Introduction

The MT3334SMI socket modem provides a fully-integrated data and fax communications design for communications over wide area networks using dial-up phone lines and the Internet.

This guide provides the Service Class 1 standard defining the commands that the developer can use to configure and control a fax/data modem and the responses (result codes) that the fax/data modem issues in response to the commands. This guide also provides the developer with specific Class 2 fax command protocol used to control the sending and receiving of faxes.

Product Description

The MT3334SMI is a standard 64-pin Socket Modem (Figure 1-1 illustrates the MT3334SMI in relationship to Multi-Tech’s Demo board) used for integrating data and fax communications. It provides:

• Low power consumption

• A serial TTL level interface

• Full-featured fax and datacomm operation

• A very small footprint for embedded applications

Features

• Complete fax / modem solution: includes the controller, data pump, and DAA

• Modem downloads at 33.6 Kbps via enhanced V.34 server and uploads at 33.6 Kbps

LED 4

LED 3

LED 2

LED 1

(enhanced V .34)

DS1

Figure 1-1. MT3334SMI and Demo Board

• Supports V.42 error correction with V .42bis or MNP Class 5 data compression

• Supports industry-standard AT -style commands

• Standard TTL serial interface supporting DTE transfer speeds to 230.4 Kbps

• Remote configuration, diagnostic tests, Distinctive Ring, 3-number storage for automatic dialing, and Flash memory for firmware updates.

• Includes NOVRAM for stored parameters

MT3334SMI6

Technical Specifications

The ModemModule meets the following specifications:

Data Rates Client-to-Server DataComm: supports enhanced V.34 (33.6K), V.32bis (14.4K), V.32 (9600), V.22bis

(2400), or slower speed connection for download speeds, and upload speeds to

33.6 Kbps via enhanced V.34.

Client-to-Client 33,600, 31,200, 28,800, 26,400, 24,000, 21,600, 19,200, 16,800, 14,400,

12,000, 9600, 7200, 4800, 2400, 1200, 0-300 bps

Fax Data Rates 14,400, 9600, 7200, 4800, 2400, 300 bps Data Format Serial, binary, asynchronous Modem Compatibility ITU-T V.34 enhanced, V.34, V.32bis, V.32, V.22bis, V.22; Bell 212A and 103/113;

ITU-T V.29, V.42, V.42bis; ITU-T V.21 & V.23 in international versions

Fax Compatibility ITU-T Group 3, Class 1 and 2, T.4, T.30, V.21, V.27ter, V.29, V.17, and TIA/

EIA TR29.2

Error Correction ITU-T V.42 (LAP-M or MNP 3–4) Data Compression ITU-T V.42bis (4:1 throughput), MNP 5 (2:1 throughput)

Chapter 1 - Introduction and Description

Speed Conversion Serial port data rates adjustable to 300, 1200, 2400, 4800, 9600, 19,200,

38,400, 57,600, 115,200, and 230,400 bps

Modes of Operation Fax online modes; full duplex over dial-up lines; data mode, command mode,

and online command mode; V.54 Test mode.

Flow Control XON/XOFF (software), RTS/CTS (hardware) Intelligent Features Fully AT command compatible; autodial, redial, repeat dial; pulse or tone dial;

dial pauses; auto answer; adaptive line probing; automatic symbol and carrier frequency during start-up, retrain, and rate renrgotiation; DTMF detection; call status display, auto-parity and data rate selections; keyboard-controlled modem options; non-volatile memory; on-screen displays for modem option parameters; command lines of up to 40 characters each; help menus; remote configuration; DTR dialing.

Command Buffer 40 characters Data Modulation FSK at 300 bps, PSK at 1200 bps, QAM at 2400, 4800, and 9600 bps (non-

trellis), QAM with trellis-coded modulation (TCM) at 9600, 12,000, 14,400, 16,800, 19,200, 21,600, 24,000, 26,400, 28,800, 31,200, and 33,600, bps

Fax Modulation V.21 CH2 FSK at 300 bps (half duplex)

V.27ter DPSK at 4800 and 2400 bps V.29 QAM at 9600 and 7200 bps V.17TCM at 14400, 12000, 9600, and 7200 bps

Carrier Frequencies 1600, 1646, 1680, 1800, 1829, 1867, 1920, ITU-T V.34 1959, 2000 Hz Carrier Frequencies 1800 Hz

ITU-T V.32bis/V.32 Carrier Frequencies Transmit originate: 1200 Hz

V.22bis/V.22 or Transmit answer: 2400 Hz Bell 212A Standard Receive originate: 2400 Hz (2400 & 1200 bps) Receive answer: 1200 Hz

MT3334SMI 7

ModemModule Developer’s Guide

Carrier Frequencies Transmit originate: 390 Hz mark

ITU-T V.23 450 Hz space (1200 bps) Receive originate: 1300 Hz mark

Transmit answer: 1300 Hz mark Receive answer: 390 Hz mark

Carrier Frequencies Transmit originate: 980 Hz mark

ITU-T V.21 1180 Hz space (0–300 bps) Receive originate: 1650 Hz mark

Transmit answer: 1650 Hz mark Receive answer: 980 Hz mark

1180 Hz space

Carrier Frequencies Transmit originate: 1270 Hz mark

Bell 103/113 1070 Hz space (0–300 bps) Receive originate: 2225 Hz mark

Transmit answer: 2225 Hz mark Receive answer: 1270 Hz mark

2100 Hz space 2100 Hz space 450 Hz space

1850 Hz space 1850 Hz space

2025 Hz space 2025 Hz space 1070 Hz space

Fax Carrier V.21 Ch2 (half duplex): Frequencies 1650 Hz mark, 1850 HZ space for transmit originate

1650 HZ mark, 1850 Hz space for transmit answer V.27ter: 1800 Hz originate/answer V.29 QAM: 1800 Hz originate/answer V.17 TCM: 1800 Hz originate/answer

Transmit Level -11 dBm (dial-up) Frequency Stability ±0.01% Receiver Sensitivity -43 dBm under worst-case conditions AGC Dynamic Range 43 dB Interface Serial interface for EIA RS-232C/ITU-T V.24/V.28 Diagnostics Local analog loop, local digital loop, remote digital loop. Weight 0.02 Kg. (0.04 lb.) Dimensions: 1.045" × 2.541" × 0.680"

(2.7 x 6.5 x 1.8 cm)

Power consumption: Typical: 215 mA (1.3 W @ 5v DC)

Maximum: 420 mA (2.1 W @ 5.25v DC)

Environmental: 0-50° C; humidity range 20–90% (non-condensing) Approvals*: UL 1950 approved

FCC Part 68 approved Industry canada CS0s EN60950

* Approvals are provided in controlled configurations and must be re-evaluated in end-user configurations.

MT3334SMI8

Physical Dimensions

Figure 1-2 illustrates the the physical dimensions of the MT3334SMI.

.286 [7,26]

.079 [2,01]

Chapter 1 - Introduction and Description

1.861 [47,27]

.079 TYP. [2,01]

.062 [1,57]

1.045 [26,54]

.050 [1,27]

.945 REF. [24]

MAXIMUM COMPONENT HEIGHT SOLDER SIDE

Figure 1-2. MT3334SMI Physical Dimensions

.354 [8,99]

.118 [3]

.050 [1,27]

1.861 [47,27]

2.019 [51,28]

2.256 [57,3]

2.550 [64,77]

.020 ± .0002 SQUARE [0,51]

.995 [25,27]

.228 [5,8]

.063 [1,6]

.310 [7,87]

CAUTION: If any component(s) is placed under the socket modem or if any component(s) should extend to the point where part of it is under the socket modem, the component(s) must NOT exceed .060 inches in height.

MT3334SMI 9

ModemModule Developer’s Guide

Test/Demo Board Specifications

The ModemModule Test/Demo Board kit includes a modem module, a power transformer for the test board, and a diskette (this Developer’s Guide manual, etc.). Figure 1-3 illustrates the demo/test board and Figure 1-4 illustrates the Test/Demo board block diagram.

LED 4

LED 3

LED 2

LED 1

DS1

Figure 1-4. MT3334SMI Test/Demo Board

Designation Function DS1 Speaker

J1 25-Pos. DSUB J2 6-Pin Mod. Jack (Line Jack) J3, J6 4-Pos. Connector J4, J5 10-Pos. Connector J7 2-Pos. Header LED1-LED4 Red LED S1 SPST Switch

MT3334SMI10

Test/Demo Board Block Diagram

Chapter 1 - Introduction and Description

Power Switch

Speaker DS1

LEDs

Power Supply

Volume Control

Socket Modem

Transceiver (RS-232)

Tip/Ring Fuse

Figure 1-4. MT3334SMI Test/Demo Board Block Diagram

Power Connector

DB-25 RS-232

RJ-11 Connector

MT3334SMI 11

ModemModule Developer’s Guide

MT3334SMI Pin-out

The MT3334SMI uses a 20-pin interface to provide an on-board DAA with tip and ring connections, audio circuit for call-progress monitoring, LED driver for call status annunciation, and serial interface via TTL level signals.

DAA

Tip Ring

1 2

64 63

SPKR AGND

VCC

Audio

DLED

-RESET

DGND

DCDIND RXIND DTRIND TXIND

29 30 31 32

41 40 39 38 37 36 35 34 33

Figure 1-5. MT3334SMI Pinout

DGND

-DTRTTL

-DCDTTL

-CTSTTL

-DSRTTL

-RITTL

-TXDTTL

-RXDTTL

-RTSTTL

Serial TTL

MT3334SMI12

T ypical Application

The table below shows the MT3334SMI pinouts and Figure 1-6 illustrates a typical OEM application.

Pin # Circuit Type Signal Description Input/Output

Chapter 1 - Introduction and Description

1RJ

-11 Jack Tip Input/Output 2 RJ-11 Jack Ring Input/Output 26 External Call Status LEDs DGND 29 External Call Status LEDs DCD Output 30 External Call Status LEDs RX Output 31 External Call Status LEDs DTR Output 32 External Call Status LEDs TX Output 33 Serial TTL RTS Input 34 Serial TTL RXD Output 35 Serial TTL TXD Input 36 Serial TTL RI Output 37 Serial TTL DSR Output 38 Serial TTL CTS Output 39 Serial TTL DCD Output 40 Serial TTL DTR Input 41 Serial TTL DGND 61 Power VCC 63 Audio AGND 64 Audio SPKR

Speaker Driver

RJ-11 Jack

1 - x 2 - x 3 4 5 - x 6 - x

1 2

64 63

Circuitry

+5v DC Power

Digital Ground

Reset

Call-status LED Circuitry

29 30 31 32

41 40 39 38 37

UART 36 35 34 33

Figure 1-6. MT3334SMI T ypical OEM Application

MT3334SMI 13

ModemModule Developer’s Guide

MT3334SMI Design Considerations

This section discusses hardware considerations, PC board layout considerations, and Telecom labeling requirements.

Hardware Considerations

Disclaimer: Multi-Tech Systems makes no warranty claims for vendor product recommendations

listed below. Other vendor products may or may not operate satifactorily. Multi-Tech System’s recommended vendor products only indicate that the product has been tested in controlled conditions and were found to perform satisfactorily .

TIP

RING

TR600-150

FERRITE-600

FB2

FERRITE-600

FB1

220PF/2KV

x x

6 5 4 3 2 1

Loaded 4 Pin Modjack

Figure 1-7. Tip and Ring Ferrite Connections

EMC: Surface mount ferrites are used on T&R (Tip and Ring) to mitigate emission levels out the RJ-

1 1 cable. 220pF capacitors are also used on T&R to reduce the common mode emissions that may be present in certain systems. The ferrite and capacitors also aid in reducing the effects of transients that may be present on the line.

Recommended Ferrite

Manufacturer – Associated Component Technology (ACT) Part # - YCB-1206

Manufacturer – Murata Erie Part # - BLM31A601SPT

Recommended Capacitor

Manufacturer – Murata Erie Manufacturer - Ever Grace Electronic Industrials Part # - GHM3045X7R221K-GC(Surface mnt) Part # - YP221K2EA7PS Part # - DE0807B221K-KH (Thru-hole device)

Note: The capacitors used on T&R must have a Y2 safety rating. Telecom: The RJ-11 connector must meet FCC Part 68 requirements. Refer to FCC Part 68 section

68.500 subpart F for connector specifications. A self-healing fuse is used in series with line to help prevent damage to the DAA circuit. This fuse is needed for FCC Part 68 compliance.

Recommended Connector

Manufacturer – Stewart Part # - 6446S/RP-30

Recommended Fuse

Manufacturer – RayChem Part # - TR600-150

Note: The fuse is also needed to meet UL1950 3rd edition protection against overvoltage from power line crosses.

MT3334SMI14

Safety: All creepages and clearances for the MT3334SMI have been designed to meet requirements

of safety standards EN60950 and IEC950. The requirements are based on a working voltage of 250V. When the recommended DAA circuit interface is implemented in a third party design all creepage and clearance requirements must be strictly adhered to. The third party safety design must be evaluated by the appropriate national agency per the required specification.

User accessible areas: Based on where the third party design is to be marketed/sold or used, it may be necessary to provide an insulating cover over all TNV exposed areas. Consult with the recognized safety agency to determine the requirements.

Notice: Even if the recommended design considerations are followed, there are no guarantees that a particular system will comply with all the necessary regulatory requirements. It is imperative that specific designs be completely evaluated by a qualified/recognized agency .

Recommended Transceiver

Manufacturer – Analog Devices Part # - ADM207EAR

PC Board Layout Considerations

This section discusses the FCC Part 68 and Industry Canada CS-03 Telecom compliance of the Multi-Tech Systems, Inc. Model MT5634SM/SMI socketed modem module.

Chapter 1 - Introduction and Description

This module was tested by the NVLAP accredited KTL Dallas Inc. laboratory and conforms to the above said standards. The modem module was tested in the MultiTech MT ASR3-200, a 3-modem asynchronous router that uses three socket modems for dial-up telephone access. The developer’s guide (included on diskette) with the MT5634SM/SMI modem includes design specifications listing recommendations for the RJ-1 1 phone jack and fuse which are needed for FCC Part 68 compliance.

The MTASR3-200 tested has sockets for three modem modules each having traces of varying lengths out to the RJ-1 1 connectors. Trace lengths ranged from 1.97 to 3.15 inches. The trace widths were all 12 mil. Since three ports with varying trace lengths were tested, we concluded that as long as the customer’s printed circuit board characteristics are reasonably close to these parameters there should not be any issues relating to telecom compliance. In addition to a recommended external fuse, the modem module also has a Sidactor on board.

Multi-Tech believes that, provided the same components are used and parts placement is similar, Telecom compliance will be maintained for the system and no additional testing is required.

Calculating Z for Tip and Ring Traces

Trace Impedance - Side-by-Side Traces

120

Where: Er = Relative permittivity of the PCB dielectric material. Typically 4 - 4.7

s = Spacing between traces - 12 mils (.012) w = Trace width - 12 mils (.012) t = Trace thickness - (.0022)

w + t

120

2.16

.03769

.0142

Note: The trace inductance for the tested design varied from 61nH to 105nH.

MT3334SMI 15

ModemModule Developer’s Guide

MT3334SMI Placement

Figure 1-8 illustrates where to place the MT3334SMI on a typical Motherboard. It must be placed so that the analog end is near the phone jack.

.0787 TYP [2]

1.732 [44]

.750 [19.05]

E (Digital)

.145 [3.683]

.945 [24.003]

B or C Note: The locking end of C should go in the Motherboard.

0.035 [0.889] Drill with 0.060 [1.524] Pad

0.125 [3.175] Non-Plated

A to D Barrier (Shown for Reference Only)

D (Power and GND)

D (Analog)

Note: The modem should be placed with the analog pins as close as possible to the line jack.

Figure 1-8: Placing the MT3334 SMI on a Typical Circuit Board

Key:

Qty Ref Name Description

1 A Reference Generic Motherboard 1 B or C Recommended RICHO DLMSP-4-01 Support Post 1 C or B Recommended RICHO MSP-4-01 Support Post 2 D Recommended 4-Pin 2mm SIP Socket (Thomas & Betts 42J2-04) 2 E Recommended 10-Pin 2mm SIP Socket (Thomas & Betts 42J2-10) 1 F Reference Socket Modem Assembly 1 G Reference Line Jack

MT3334SMI16

Telecom Labeling Requirements

FCC regulations require labeling of registered Telephone and Data Terminal Equipment in accordance with Part 68 Subpart D. There are two options available for labeling of the device containing the MT5634SM modem module. The first option would be to use the registration number assigned to Multi-Tech Systems, Inc. by the FCC as explained in Section 68.300 below and shown in the sample label. The second option would be for the customer to submit applications for and use their own registration number that would be assigned by the FCC. This would require a letter of authorization for reregistration written by Multi-Tech Systems, Inc. giving the customer permission to reregister the product. The customer would also need to obtain and file the necessary documents and pay the required fees to the FCC.

Similarly, Industry Canada requires labeling in accordance with CS-03 requirements. Each modem module includes an Industry Canada label that should be attached to the final product as described in the Industry Canada CS-03 section below. Multiple Listing (similar to FCC’ s re-registration) is also an option for Industry Canada labeling. Instructions are also detailed below.

FCC Part 68

(From FCC P AR T 68 Subpart D—Conditions for Registration) Complete document available from US Government Printing Office:

http://www.access.gpo.gov/cgi-bin/cfrassemble.cgi?title=199847

Chapter 1 - Introduction and Description

Section 68.300 Labeling requirements. (a) Registered terminal equipment and registered protective circuitry shall have prominently

displayed on an outside surface the following information in the following format:

Complies With Part 68, FCC Rules FCC Registration Number: _____________ Ringer Equivalence: ____

(b) Registered terminal equipment and registered protective circuitry shall also have the following

identifying information permanently affixed to it. (1) Grantee’s name. (2) Model number, as specified in the registration application. (3) Serial number or date of manufacture. (4) Country of origin of the equipment: “Made in __________.”

Required if the equipment is not manufactured in the United States. (Country of origin shall be determined in accordance with 19 U.S.C. 1304 and regulations promulgated thereunder.)

(5) As used herein, permanently affixed means that the required nameplate data is etched,

engraved, stamped, indelibly printed or otherwise permanently marked. Alternatively, the required information may be permanently marked on a nameplate of metal, plastic, or other material fastened to the enclosure by welding, riveting, or with a permanent adhesive. Such a nameplate must be able to last for the expected lifetime of the equipment and must not be readily detachable.

(6) When the device is so small or for such use that it is not practical to place the statements

specified in this section on it, the information required by paragraphs (a) and (b) of this section shall be placed in a prominent location in the instruction manual or pamphlet supplied to the user. The FCC Registration Number and the Model Number shall be displayed on the device.

Sample: Complies With Part 68, FCC Rules

FCC Registration Number:

AU7USA-25814-M5-5 Ringer Equivalence Multi-T ech Systems, Inc. Model MT5634SM S/N: xxxxxxx

MT3334SMI 17

ModemModule Developer’s Guide

Reregistration

(From Form 730 Application Guide Appendix C-2) http://www.fcc.gov/formpage.html Private label distributors may obtain a registration number in their own name. In this case, a

reregistration filing is made with the submission of Exhibit B, a copy of a letter from the original registrant to the applicant giving permission for the reregistration and a willingness to provide the applicant with any technical support. The applicant will replace the registration label on the original grantee with the one containing the newly assigned registration number.

Industry Canada CS-03

Canadian regulations require that certified equipment bear an identifying certification label which is obtained from Industry Canada. The label provided must be displayed on the equipment according to Industry Canada specifications. http://spectrum.ic.gc.ca/~cert/

From Certification Procedure 01 (CP-01): Certified equipment will bear an identifying certification label and the certificate holder will be

responsible for permanently affixing this certification label. The certification label identifies certified equipment to the public, representatives of the telecommunications common carriers, the Department, and other interested parties. The label must be permanently affixed to the equipment.

Multiple Listing

This terminal device may be multiple listed to other distributors based upon the approval granted to the original certificate holder. In order to obtain a multiple listing certification, the following documentation must be presented to Industry Canada:

(a) The model number , Industry Canada certificate number and certification number of the approved

equipment;

(b) a letter from the original certificate holder authorizing the Department to use information on file to

grant a multiple listing certification. The name / model number , certificate number and certification number for the subject equipment must be shown. The letter must also declare that the model to be multiple listed is identical in design and construction to the originally approved

model; (c) a letter, from the proposed multiple listee, requesting the certification; (d) a Terminal Equipment Certification / Testing Application and Agreement form, completed by the

proposed multiple listee; (e) a drawing, sample or illustration of the product label; and (f) payment in accordance with TRC-49 section on Multiple Listings.

MT3334SMI18

Chapter 2 - AT Commands, S-Registers,

and Result Codes

ModemModule Developer’s Guide

Introduction

The AT commands are used to control the operation of your modem. They are called AT commands because each command must be preceded by the characters AT to get the ATtention of the modem.

A T commands can be issued only when the modem is in command mode or online command mode. The modem is in command mode whenever it is not connected to another modem. The modem is in

data mode whenever it is connected to another modem and ready to exchange data. Online command mode is a temporary state in which you can issue commands to the modem while

connected to another modem. To put the modem into online command mode from data mode, you must issue an escape sequence (+++) followed immediately by the AT characters and the command, e.g., +++ATH to hang up the modem. To return to data mode from online command mode, you must issue the command ATO.

To send AT commands to the modem you must use a communications program, such as the HyperTerminal applet in Windows 98/95 and NT 4.0, or some other available terminal program. You can issue commands to the modem either directly , by typing them in the terminal window of the communications program, or indirectly, by configuring the operating system or communications program to send the commands automatically. Fortunately, communications programs make daily operation of modems effortless by hiding the commands from the user . Most users, therefore, need to use AT commands only when reconfiguring the modem, e.g., to turn autoanswer on or off.

The format for entering an AT command is ATXn, where X is the command and n is the specific value for the command, sometimes called the command parameter. The value is always a number . If the value is zero, you can omit it from the command; thus, AT&W is equivalent to AT&W0. Most commands have a default value, which is the value that is set at the factory. The default values are shown in the “A T Command Summary” (See below).

You must press ENTER (depending on the terminal program it could be some other key) to send the command to the modem. Any time the modem receives a command, it sends a response known as a result code. The most common result codes are OK, ERROR, and the CONNECT messages that the modem sends to the computer when it is connecting to another modem. For a table of valid result codes, see “Result Codes” at the end of this chapter.

You can issue several commands in one line, in what is called a command string. The command string begins with AT and ends when you press ENTER. Spaces to separate the commands are optional; they are ignored by the command interpreter. The most familiar command string is the initialization string, which is used to configure the modem when it is turned on or reset, or when your communications software calls another modem.

AT Command Summary

Command: AT Attention Code Values: n/a Description: The attention code precedes all command lines except A/, A:, and escape

Command: ENTER Key Values: n/a Description: Press the E

Command: A Answer Values: n/a Description: Answer call before final ring.

sequences.

NTER (RETURN) key to execute most commands.

Command: A/ Repeat Last Command Values: n/a Description: Repeat the last command string. Do not precede this command with AT. Do not

press E

NTER to execute.

MT3334SMI20

Chapter 2 - AT Commands, S-Registers, and Result Codes

Command: Bn Communication Standard Setting Values: n = 0–3, 15, 16 Default: 1 and 16 Description: B0 Select ITU-T V.22 mode when modem is at 1200 bps.

B1 Select Bell 212A when modem is at 1200 bps. B2 Deselect V.23 reverse channel (same as B3). B3 Deselect V.23 reverse channel (same as B2). B15 Select V.21 when the modem is at 300 bps. B16 Select Bell 103J when the modem is at 300 bps.

Command: Ds Dial Values: s = dial string (phone number and dial modifiers) Default: none Description: Dial telephone number s, where s may up to 40 characters long and include the 0–9, *, #, A, B, C,

and D characters, and the L, P, T, V, W, S, comma (,), semicolon (;), !, @, ^ and $ dial string modifiers.

Dial string modifiers:

L Redial last number. (Must be placed immediately after ATD.) P Pulse-dial following numbers in command. T Tone-dial following numbers in command (default). V Switch to speakerphone mode and dial the following number. Use ATH command to hang up. W Wait for a new dial tone before continuing to dial. (X2, X4, X5, X6, or X7 must be selected.) , Pause during dialing for time set in register S8. ; Return to command mode after dialing. (Place at end of dial string.) ! Hook flash. Causes the modem to go on-hook for one-half second, then off-hook again. @ Wait for quiet answer. Causes modem to wait for a ringback, then 5 seconds of silence, before

processing next part of command. If silence is not detected, the modem returns a NO ANSWER code.

^ Disable data calling tone transmission. $ Detect AT&T call card “bong” tone. The character should follow the phone number and precede

the user’s call card number: ATDT1028806127853500

$123456789

Command: DS=y Dial Stored Telephone Number Values: n = 0–3 Default: none Description: Dial a number previously stored in directory number y by the &Zy=x command.

Example: ATDS=3

Command: En Echo Command Mode Characters Values: n = 0 or 1 Default: 1 Description: E0 Do not echo keyboard input to the terminal.

E1 Do echo keyboard input to the terminal.

Command: Fn Echo Online Data Characters Values: n = 1 Default: 1 Description: F0 Enable online data character echo. (Not supported.)

F1 Disable online data character echo (included for backward compatibility with some software).

Command: Hn Hook Control Values: n = 0 or 1 Default: 0 Description: H0 Go on-hook (hang up).

H1 Go off-hook (make the phone line busy).

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ModemModule Developer’s Guide

Command: In Information Request Values: n = 0–5, 9, 11 Default: None Description: I0 Display default speed and controller firmware version.

I1 Calculate and display ROM checksum (e.g., 12AB). I2 Check ROM and verify the checksum, displaying OK or ERROR. I3 Display default speed and controller firmware version. I4 Display firmware version for data pump (e.g., 94). I5 Display the board ID: software version, hardware version, and country ID I9 Display the country code (e.g., NA Ve r. 1). I11 Display diagnostic information for the last modem connection, such as DSP and firmware version,

link type, line speed, serial speed, type of error correction/data compression, number of past retrains, etc.

Command: Ln Monitor Speaker Volume Values: n = 0, 1, 2, or 3 Default: 2 Description: L0 Select low volume.

L1 Select low volume. L2 Select medium volume. L3 Select high volume.

Command: Mn Monitor Speaker Mode Values: n = 0, 1, 2, or 3 Default: 1 Description: M0 Speaker always off.

M1 Speaker on until carrier signal detected. M2 Speaker always on when modem is off-hook. M3 Speaker on until carrier is detected, except while dialing.

Command: Nn Modulation Handshake Values: n = 0 or 1 Default: 1 Description: N0 Modem performs handshake only at communication standard specified by S37 and the B

command.

N1 Modem begins handshake at communication standard specified by S37 and the B command.

During handshake, fallback to a lower speed can occur.

Command: On Return Online to Data Mode Values: 0, 1, 3 Default: None Description: O0 Exit online command mode and return to data mode (see +++AT<CR> escape sequence ).

O1 Issue a retrain and return to online data mode. O3 Issue a rate renegotiation and return to data mode.

Command: P Pulse Dialing Values: P, T Default: T Description: Configures the modem for pulse (non-touch-tone) dialing. Dialed digits are pulsed until a T

command or dial modifier is received.

Command: Qn Result Codes Enable/Disable Values: n = 0 or 1 Default: 0 Description: Q0 Enable result codes.

Q1 Disable result codes. Q2 Returns an OK for backward compatibility with some software.

Command: Sr=n Set Register Value Values: r = S-register number; n varies Default: None Description: Set value of register Sr to value of n, where n is entered in decimal format. E.g., S0=1.

MT3334SMI22

Chapter 2 - AT Commands, S-Registers, and Result Codes

Command: Sr? Read Register Value Values: r = S-register number Default: None Description: Read value of register Sr and display it in 3-digit decimal form. E.g., S2? gives the response 043.

Command: T Tone Dialing V alues: P, T Default: T Description: Configures the modem for DTMF (touch-tone) dialing. Dialed digits are tone dialed until a P

command or dial modifier is received.

Command: Vn Result Code Format Values: n = 0 or 1 Default: 1 Description: V0 Displays result codes as digits (terse response).

V1 Displays result codes as words (verbose response).

Command: Wn Result Code Options Values: n = 0, 1, or 2 Default: 2 Description: W0 CONNECT result code reports serial port speed, disables protocol result codes.

W1 CONNECT result code reports serial port speed, enables protocol result codes. W2 CONNECT result code reports line speed, enables protocol result codes.

Command: Xn Result Code Selection Values: n = 0–7 Default: 4 Description: X0 Basic result codes (e.g., CONNECT); does not look for dial tone or busy signal.

X1 Extended result codes (e.g., CONNECT 46000 V42bis); does not look for dial tone or busy signal. X2 Extended result codes with NO DIALTONE; does not look for busy signal. X3 Extended result codes with BUSY; does not look for dial tone. X4 Extended result codes with NO DIALTONE and BUSY. X5 Extended result codes with NO DIALTONE and BUSY. X6 Extended result codes with NO DIALTONE and BUSY. X7 Basic result codes with NO DIALTONE and BUSY.

Command: Zn Modem Reset Values: n = 0 or 1 Default: None Description: Z0 Reset modem to profile saved by the last &W command.

Z1 Same as Z0.

Command: &Cn Data Carrier Detect (DCD) Control Values: n = 0 or 1 Default: 1 Description: &C0 Forces the DCD circuit to be always high.

&C1 DCD goes high when the remote modem’s carrier signal is detected, and goes low when the

carrier signal is not detected.

Command: &Dn Data Terminal Ready (DTR) Control Values: n = 0, 1, 2, or 3 Default: 2 Description: &D0 Modem ignores the true status of the DTR signal and responds as if it is always on.

&D1 If DTR drops while in online data mode, the modem enters command mode, issues an OK, and

remains connected.

&D2 If DTR drops while in online data mode, the modem hangs up. If the signal is not present, the

modem will not answer or dial.

&D3 If DTR drops, the modem hangs up and resets as if an ATZ command were issued.

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