Zhone 3920Plus Manual de Instruções descarregar pdf (Página 233)

14-13920-A2-GH30-40 October 1998

AT Command Set and S-Registers

Overview 14-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Command and Data Modes 14-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switching Between Data Mode and Online Command Mode 14-1. . . . . . . . .

Escape Sequence and Escape Guard Time 14-2. . . . . . . . . . . . . . . . . . . . . .

Command Guidelines 14-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Result Codes 14-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AT Command List 14-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AT Command Format 14-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

S-Register List 14-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

S-Register Format 14-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview

In Singleport mode, the AT command set provides an alternative method to the modem’s DCP for

entering commands that control the operation and configuration of the 392xPlus modems. This

chapter discusses guidelines necessary to operate AT commands as well as listing the modifiers for

all AT commands supported by the 392xPlus modems. AT commands are issued from

asynchronous DTEs.

Command and Data Modes

AT commands enable you to operate in Command mode and Data mode. Before a modem goes

online (establishes a successful connection with a remote modem), it is considered to be in

Command mode; an idle state where you can modify its operating parameters or issue modem

commands. (Any command issued is acknowledged with a response in either words or digits

known as Result Codes. Refer to Table 14-1 for a listing of result codes.)

Once the modems are online, either by answering or originating a call, they automatically switch to

Data mode. Data mode is a state where any entries made from the DTE are considered data and are

transmitted and received between modems. The modems remain in Data mode until the connection

is broken or until they are forced into online Command mode using the escape sequence (+++).

Switching Between Data Mode and Online Command Mode

Sometimes it is necessary to change operating parameters while the modems are online. The

Escape Sequence allows you to toggle the modem between Data mode and online Command mode

while maintaining a connection with the remote modem. This is accomplished using the escape

sequence to exit Data mode and the O command to return to Data mode.

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Zhone 3920Plus Manual de Instruções Página 233