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Telenetics V.32bis Series, V.34-SDC manual What is the Attention AT Command Set?, Using AT Commands

Models: 326X V.34 V.32bis Series V.34-SDC

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What is the Attention (AT) Command Set?

The AT command set is a collection of commands that let you configure a modem directly from an asynchronous terminal or PC keyboard. The characters AT are a prefix to the commands you issue to your modem. When you type AT, you are asking for the modem’s attention. For instance, to disconnect a telephone call, you type AT for attention and H0 for on-hook (hang up).

You can also use AT commands to configure a remote modem (refer to Chapter 2, Front Panel Operation, of the 326X Series Modem Reference Guide for details).

What Role Does Communications Software Play?

Some communications software packages “interpret”AT commands with pull-down menus or graphics, making familiarity with the AT command syntax unnecessary.

Communications software packages that directly support the 326X Series Modem usually support all of the modem’s AT commands (the industry standard commands AT, AT&, and the Telenetics-enhanced commands AT*).

Communications software packages that support a Hayes-compatible selection do not support the Telenetics-enhanced commands (AT*). You can enter these commands yourself to modify option settings if required by your application.

Check the documentation included with your communications software package to determine whether you need to use AT commands directly.

Using AT Commands

AT commands are accepted by the modem in command mode or escape mode.

•The modem is in command mode when it is disconnected from the telephone line.

•You can enter escape mode and issue AT commands during a connection (the escape sequence +++ is described later in this chapter).

Entering AT Command Lines

To enter a single AT command line:

1)Enter the prefix AT: The characters AT (upper-case or lower-case, but not mixed) must begin the command line.

2)Enter an AT command. For example:

—D instructs the modem to dial a call. H instructs the modem to hang up. A numeric character (for example, 2) following an AT command instructs the modem to use a specific command option. If a numeric character is not indicated, the modem assumes the 0 (zero) option.

3)End with a carriage return <CR>.

The exceptions to the aboveAT command line conventions are“A/” (repeat last command) and “+++” (the escape sequence). Responses (result codes) to AT commands always appear in upper-case.

Using the

AT ACU

Using the AT Automatic Calling Interface 5-3

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Telenetics V.32bis Series, V.34-SDC What is the Attention AT Command Set?, Using AT Commands, Entering AT Command Lines
Page 88 Page 90

326X V.34, V.32bis Series, V.34-SDC specifications

Telenetics has been a key player in the field of telecommunications, offering advanced modem solutions that cater to diverse communication needs. Among their notable products are the V.34-SDC and V.32bis series, including the 326X V.34 modem. These modems have been designed to enhance data transmission reliability and speed in various applications.

The Telenetics V.34-SDC modem represents a significant leap in technology, supporting data rates of up to 28.8 Kbps. This modem utilizes the advanced V.34 modulation scheme, which optimizes the use of existing telephone lines to deliver impressive performance, especially for users requiring high-speed data transmission. The V.34-SDC model also features robust error correction and data compression techniques, ensuring that users receive accurate data even over less than ideal connections. With its extended line-conditioning capabilities, the V.34-SDC modem can efficiently handle long distances and poor line conditions.

Equally noteworthy is the V.32bis series, which provides backward compatibility with V.32 modems, enabling seamless integration into existing systems. Capable of speeds up to 14.4 Kbps, the V.32bis modems are ideal for businesses and environments where legacy systems remain in use. It features adaptive equalization and advanced echo cancellation, ensuring a clear signal is maintained throughout the data transmission process. This versatility allows users to connect with various devices across different infrastructures.

The 326X V.34 modem further exemplifies Telenetics' commitment to high performance. It combines the V.34 capabilities with enhanced security features, offering users encryption options for sensitive data. This is particularly crucial for businesses that need to safeguard their information against potential vulnerabilities during transmission. The 326X also supports various data communication protocols, making it adaptable for multiple platforms and applications.

In summary, Telenetics’ V.34-SDC, V.32bis series, and 326X V.34 modems stand out for their high-speed data transmission, compatibility, advanced error correction, and security features. These technologies make them excellent choices for both enterprise and networking applications where reliable communication is vital. Telenetics continues to innovate, delivering modem solutions that meet the evolving demands of the telecommunications landscape.