Black Box MD403A Data Carrier Detect DCD Control, ON/X-OFF Pacing Control, Load Factory Settings

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CHAPTER 4: AT Commands, S-Registers, and Result Codes

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.

 

&C2

DCD drops briefly following disconnect, then goes

 

 

high again. Register S18 defines how long DCD

 

 

signal remains low after disconnect.

Command:

&En

X-ON/X-OFF Pacing Control

Values:

 

n=12 or 13

Default:

 

12

Description:

&E12

Disables X-ON/X-OFF pacing.

 

&E13

Enables X-ON/X-OFF pacing. (&K4 must also be

 

 

set.)

NOTE

&E13 has no effect if hardware control (&K3) is selected.

CAUTION

Do not enable pacing unless you need it. Some applications may not work if pacing is enabled.

Command:

&Fn

Load Factory Settings

Values:

 

n=0

Default:

 

None

Description:

&F0

Load factory settings as active configuration.

Command:

&Gn

V.22bis Guard Tone Control

Values:

 

n=0, 1, or 2

Default:

 

0

Description:

&G0

Disable guard tone.

 

&G1

Set guard tone to 550 Hz.

 

&G2

Set guard tone to 1800 Hz.

NOTE

The &G command is not used in North America.

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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 Specifications Command Buffer 40 charactersFrequency Stability ±0.01% AGC Dynamic Range 43 dBTemperature Tolerance 32 to 120F 0 to 50C Introduction OverviewUniversal Serial Bus USB What the Package IncludesWhat Can You Do with Your Modem? Features Required Equipment USB and communications connectors ConnectionsFront Panel Front panelInstallation Connect the Modem to Your SystemInstalling the Modem Welcome screen Install Hardware Device Drivers screen Locate Driver Files screen Driver Files Search Results screen Click Yes to continue with the installation Digital Signature Not Found screen appearsCompletion 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 Click Start Settings Control Panel Go to Start Settings Control PanelConfiguring the Modem for Your Country References AT Commands, S-Registers, and Result Codes AT CommandsEnter Key Repeat Last CommandCommunication Standard Setting AnswerDial Carrier ControlATDT1028807637853500$123456789 Echo Online Data Characters Echo Command Mode CharactersDS=y Dial Stored Telephone Number Hook ControlModulation Handshake Monitor Speaker ModeReturn Online to Data Mode Pulse DialingSr? Read Register Value Result Codes Enable/DisableSr=n Set Register Value Tone DialingLong Space Disconnect Modem ResetResult Code Selection Auto RetrainON/X-OFF Pacing Control Load Factory SettingsData Carrier Detect DCD Control 22bis Guard Tone ControlFlow Control Selection Asynchronous Communications ModeTest Commands Data Set Ready DSR ControlSelect Stored Configuration for Hard Reset Display Current SettingsStore Current Configuration Zy=x Store Dialing Command\Jn Data Buffer Control \Bn Transmit Break\Gn Modem Port Flow Control \Kn Break ControlOnline command mode. The modem receives a \Nn Error Correction Mode Selection\Vn Protocol Result Code \Tn Inactivity Timer\Qn Flow Control Selection \Xn ON/X-OFF Pass-ThroughView Numbers in Blacklist Adaptive Answer Result Code Enable#Sx Enter Setup Password Data Compression Control#S=x Atcr Remote Configuration Escape Sequence+++ATCR Escape Sequence Unit Range Default Description RegistersSeconds 255 Unit Range Default Description Upstream data rates S48=7 S48=128 Result Codes Verbose DescriptionConnected at 2400 bps Terse Verbose Description Setup Remote ConfigurationBasic Procedure IntroductionChanging the Setup Password None of the Indicators Light TroubleshootingModem Does Not Respond to Commands Modem Dials But Cannot Connect Modem Disconnects While Online Modem Doesn’t Work with Caller ID Modem Cannot Connect When AnsweringFax and Data Software Can’t Run at the Same Time Calling Black Box Shipping and PackagingV.90 Troubleshooting Appendix A. V.90 SupportAppendix B. Loopback Tests Local Analog Loopback Test V.54 Loop Figure B-1. Local analog loopback testRemote Digital Loopback Test V.54 Loop Figure B-2. Remote digital loopback testLocal Digital Loopback Test V.54 Loop Figure B-3. Local digital loopback testAppendix 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 Windows 2000 Dial-Up Networking Figure C-6. Network Connection Wizard dialog boxFigure C-7. Network Connection Type dialog box Figure C-8. Welcome to the Internet World Connection Wizard Internet account connection, and click Next If you select Accept incoming connectionsIf you select Connect directly to another computer Upgrade Overview Appendix D. Upgrading ModemAppendix 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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