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ProxyServer User Guide

MTPSR1-202ST

Appendix D - AT Commands

One of the means by which you can communicate with and configure your ProxyServer is to use AT

commands. AT commands are so-called because, with only a few exceptions, each command string

must begin with the characters

. Using AT commands, you can read and set parameters, and

perform actions such as dialing.

Entering AT Commands

If your ProxyServer is connected to a computer terminal, you can send AT commands to the Proxy-

Server by typing them on the terminal keyboard. If your ProxyServer is connected to a computer, you

can send AT commands to the ProxyServer by typing them in the terminal window of a data commu-

nications program such as HyperTerminal. You can also send some AT commands indirectly by

configuring your data communications program.

Enter AT commands in the format

AT <command string> <CR>

. The characters

cause the

ProxyServer to interpret the following string as a command. The command string consists of one or

more commands. The carriage return character, <CR>, sends the command string to the ProxySer-

ver. If you are entering a command string in your communication program’s terminal window, insert

the carriage return character by pressing the ENTER key on your keyboard. If you are configuring a

communications program, on the other hand, you typically must insert the carriage return character

by adding “^M” to the end of the command string.

The ProxyServer has three modes of operation: offline command mode (the default state), online

command mode, and data mode. The ProxyServer responds to AT commands only when it is in one

of the command modes. After the ProxyServer establishes a connection and goes online in data

mode, it interprets any further characters you enter as data, rather than as commands, and transmits

them to the remote device.

When the ProxyServer is in data mode, you can switch it to online command mode by sending it an

escape sequence

. The ProxyServer responds to two types of escape sequences: in-band, in which

the escape sequence is part of the data stream, and out-of-band, in which the escape sequence is

outside the data stream. The in-band escape sequence is

+++AT<CR>

; the out-of-band escape

sequence is

. You can change the in-band escape character (+) by changing the

value in register

. 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 ProxyServer enters online command mode, in which it

responds to commands while maintaining the connection with the remote device.

The ProxyServer’s command buffer can store 80 characters, including spaces and other characters

used in telephone numbers. If you mis-type a command string, you can edit it by using the backspace

or the delete 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.

Table D-1 lists the AT commands recognized by the ProxyServer. For an alphabetic list of AT com-

mands, see “AT commands” in the index.

Table D-1. AT Commands by Function

Command Function

Command Execution

AT Attention code

Return Command execution

+++AT<CR> In-band escape code

<BREAK> AT

<CR> Out-of-band escape code

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 103 104

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