Terminal Adapter

Chapter 5—TERMINAL ADAPTER AT Commands, S-Registers, Result Codes

Terminal Adapter AT Commands

One of the ways you can communicate with and configure your terminal adapter (TA) is to use AT commands. AT commands are so-called because, with only a few exceptions, each command string begins with the characters AT. Using AT commands, you can read and set parameters and perform actions such as dialing.

Entering AT Commands

You can send AT commands to the TA by entering them on the keyboard, by typing them in the terminal window of a data communications program such as HyperTerminal, or indirectly by configuring your data communications program.

Enter AT commands in the following format: AT <command string> <cr>. The AT characters cause the TA to interpret the following string of characters as a command. The command string consists of one or more commands. The carriage return character, <cr>, sends the command string to the TA. If you are entering a command string in your communication program’s terminal window, insert the carriage return character by pressing ENTER. On the other hand, if you are configuring a communications program, you typically must insert the carriage return character by adding ^M to the end of the command string.

The TA has three modes of operation: offline command mode (the default state), online command mode, and data mode. The TA responds to AT commands only when it is in one of the command modes. After the TA establishes a connection and goes online in data mode, it interprets any further characters you enter as data rather than commands and transmits them to the remote device.

When the TA is in data mode, you can switch it to online command mode by sending it an escape sequence. The TA responds to two types of escape sequences: in-band (escape sequence is part of the data stream) and out-of-band (escape sequence is outside the data stream). The in-band escape sequence is +++AT<cr>; the out-of-band escape sequence is <Break >AT<cr>. You can change the in-band escape character (+) by changing the value in register S2. You can send the break signal in the out-of-band escape sequence only from software, not by pressing SHIFT+BREAK on your keyboard.

When it detects the escape sequence, the TA enters online command mode, in which it responds to commands while maintaining the connection with the remote device.

The TA ’s command buffer can store 80 characters, including spaces and other characters used in telephone numbers. If you mistype a command string, you can edit it by using the backspace key, but only before you press ENTER. As you type a command string, it appears on your monitor screen, letting you verify your input as you type it.

AT commands recognized by the ISIHI-2S terminal adapter are listed by function on the following page. For an alphabetic list of AT commands, see AT commands in the index. The commands in this chapter are organized by function. Abbreviated commands are listed on the following page by function along with a short description and page numbers that refer to a more detailed description, immediately following this list.

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MultiModemISI Hybrid Series, ISIHI-2S

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Multi Tech Equipment ISIHI-2S manual Terminal Adapter AT Commands, Entering AT Commands
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