Multitech MTA128ST Manual do Proprietário descarregar pdf (Página 30)

30-IWay Hopper

AT Commands/S-Registers

Chapter 4--Introduction

One of the means by which you can communicate with and configure your

MTA128ST is to use AT commands. AT commands are so-called because, with

only a few exceptions, each command string must begin with the characters AT.

Using AT commands, you can read and set parameters, and perform actions such

as dialing.

4.1.1 Entering AT Commands

If your MTA128ST is connected to a computer terminal, you can send AT com-

mands to the MTA128ST by typing them on the terminal keyboard. If your

MTA128ST is connected to a computer, you can send AT commands to the

MTA128ST by typing them in the terminal window of a data communications

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

AT cause the MTA128ST 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 MTA128ST. If you are entering a com-

mand string in your communication programs terminal window, insert the carriage

return character by pressing the ENTER key on your keyboard. If you are config-

uring 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 MTA128ST has three modes of operation: offline command mode (the default

state), online command mode, and data mode. The MTA128ST responds to AT

commands only when it is in one of the command modes. After the MTA128ST

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 MTA128ST is in data mode, you can switch it to online command mode

by sending it an escape sequence. The MTA128ST responds to two types of es-

cape 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 <Break

>AT<CR>. You can change the in-band escape character (+) by changing the

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 116 117

Sem comentários

Multitech MTA128ST Manual do Proprietário Página 30