Black Box MD403A user manual AT Commands, S-Registers, and Result Codes

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PORTABLE USB MODEM

4.AT Commands, S-Registers, and Result Codes

4.1AT Commands

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

AT commands can be issued only when the modem is in command mode or online command mode. The modem is in command mode when it is not connected to another modem. The modem is in data mode when 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 (for example, +++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 NT® 4.0, or the communications program included with your modem. 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 a modem (for example, 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.

You must press ENTER 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 Section 4.3.

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Contents Portable USB Modem Users’ Manual FCC and IC RFI Statements EMC, Safety and R&TTE Directive Compliance FCC Requirements for Telephone-Line Equipment Certification Notice for Equipment Used in Canada NOM Statement Portable USB Modem Trademarks Used in this Manual Contents Contents Command Buffer 40 characters SpecificationsAGC Dynamic Range 43 dB Frequency Stability ±0.01%Temperature Tolerance 32 to 120F 0 to 50C Overview IntroductionWhat the Package Includes Universal Serial Bus USBWhat Can You Do with Your Modem? Features Required Equipment Connections USB and communications connectorsFront panel Front PanelConnect the Modem to Your System InstallationInstalling the Modem Welcome screen Install Hardware Device Drivers screen Locate Driver Files screen Driver Files Search Results screen Digital Signature Not Found screen appears Click Yes to continue with the installationCompletion screen Installation in Windows ME Portable USB Modem Add New Hardware Wizard screen What do you want Windows to do? screen 10. Windows will search for a new driver screen 11. Updated driver found screen 12. Verification screen 13. Finish screen Go to Start Settings Control Panel Click Start Settings Control PanelConfiguring the Modem for Your Country References AT Commands AT Commands, S-Registers, and Result CodesAnswer Repeat Last CommandCommunication Standard Setting Enter KeyCarrier Control DialATDT1028807637853500$123456789 Hook Control Echo Command Mode CharactersDS=y Dial Stored Telephone Number Echo Online Data CharactersPulse Dialing Monitor Speaker ModeReturn Online to Data Mode Modulation HandshakeTone Dialing Result Codes Enable/DisableSr=n Set Register Value Sr? Read Register ValueAuto Retrain Modem ResetResult Code Selection Long Space Disconnect22bis Guard Tone Control Load Factory SettingsData Carrier Detect DCD Control ON/X-OFF Pacing ControlData Set Ready DSR Control Asynchronous Communications ModeTest Commands Flow Control SelectionZy=x Store Dialing Command Display Current SettingsStore Current Configuration Select Stored Configuration for Hard Reset\Kn Break Control \Bn Transmit Break\Gn Modem Port Flow Control \Jn Data Buffer Control\Nn Error Correction Mode Selection Online command mode. The modem receives a\Xn ON/X-OFF Pass-Through \Tn Inactivity Timer\Qn Flow Control Selection \Vn Protocol Result CodeData Compression Control Adaptive Answer Result Code Enable#Sx Enter Setup Password View Numbers in BlacklistAtcr Remote Configuration Escape Sequence #S=x+++ATCR Escape Sequence Registers Unit Range Default DescriptionSeconds 255 Unit Range Default Description Upstream data rates S48=7 S48=128 Verbose Description Result CodesConnected at 2400 bps Terse Verbose Description Introduction Remote ConfigurationBasic Procedure SetupChanging the Setup Password Troubleshooting None of the Indicators LightModem Does Not Respond to Commands Modem Dials But Cannot Connect Modem Disconnects While Online Modem Cannot Connect When Answering Modem Doesn’t Work with Caller IDFax and Data Software Can’t Run at the Same Time Shipping and Packaging Calling Black BoxAppendix A. V.90 Support V.90 TroubleshootingAppendix B. Loopback Tests Figure B-1. Local analog loopback test Local Analog Loopback Test V.54 LoopFigure B-2. Remote digital loopback test Remote Digital Loopback Test V.54 LoopFigure B-3. Local digital loopback test Local Digital Loopback Test V.54 LoopAppendix B Loopback Tests Appendix C. Dial-Up Networking Windows 98/Me Dial-Up Networking Figure C-3. Dial-Up connection created Figure C-4. Networking tab Figure C-5. TCP/IP Settings dialog box Figure C-6. Network Connection Wizard dialog box Windows 2000 Dial-Up NetworkingFigure C-7. Network Connection Type dialog box Figure C-8. Welcome to the Internet World Connection Wizard If you select Accept incoming connections Internet account connection, and click NextIf you select Connect directly to another computer Appendix D. Upgrading Modem Upgrade OverviewAppendix D Upgrading the Modem Copyright 2004. Black Box Corporation. All rights reserved
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MD403A specifications

The Black Box MD403A is a powerful and versatile device widely recognized for its advanced technology and its ability to streamline data communication. Ideal for both personal and professional use, the MD403A is designed to cater to various environments, from small offices to larger enterprises.

One of the main features of the MD403A is its robust connectivity options. It supports multiple interfaces, including USB, HDMI, and Ethernet, allowing seamless integration with various devices such as computers, projectors, and IP networks. This flexibility makes it a popular choice for businesses that require reliable data transmission across different platforms.

The device is equipped with advanced signal processing capabilities that ensure high-quality data transfer. Utilizing cutting-edge technology, the MD403A minimizes signal loss, thereby enhancing performance and ensuring that the transmitted data remains intact. This feature is particularly crucial in scenarios where large amounts of data need to be transmitted quickly and without loss of quality.

Another significant characteristic of the Black Box MD403A is its user-friendly design. The interface is intuitive, making it easy for users of all technical abilities to navigate the system effortlessly. It typically comes with a straightforward setup process, minimizing downtime and allowing users to get up and running quickly.

The MD403A also boasts advanced security features. It employs multiple encryption protocols to safeguard sensitive information during transmission. With increased cybersecurity concerns, this feature is essential for businesses that handle confidential data, ensuring compliance with various regulatory requirements.

Additionally, the device supports various video resolutions, making it suitable for both standard and high-definition applications. This feature is particularly beneficial for users who want to deliver high-quality presentations or video content without compromising on clarity.

In terms of durability, the MD403A has a sturdy design that can withstand the rigors of daily use. Its compact form factor allows for easy portability, making it an ideal choice for professionals who are always on the move.

In summary, the Black Box MD403A combines advanced features, multiple connectivity options, robust security, and ease of use, making it an essential tool for modern communication needs. Its adaptability and performance make it a preferred choice for users seeking reliable data transfer solutions in diverse settings.
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