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XE2814

V.34 Modem for Data & Fax

Xecom 

AT Commands

The XE2814 uses "AT" commands for

control and configuration . Fax is supported

by extensions to the AT commands.

Modes of Operation

The XE2814 has three operational modes;

Command, Fax and Data.

Data Mode: The modem enters data mode

after it establishes a connection and

issues a "CONNECT" result code. In

Data Mode the modem modulates all

signals on Transmit Data and sends

them to the remote modem. The

modem demodulates all signals from the

remote modem and places them onto

Received Data for the host equipment.

When the modem exits data mode, it

issues a "NO CARRIER" result code.

Command Mode: The XE2814 enters

command mode on application of power,

reset, loss of the connection, or receipt

of the escape code. In command mode

the modem accepts commands from the

host on Transmit Data. More than one

command may be placed on each

command line. Appropriate result codes

are returned on Received Data.

Fax Mode: The modem enters Class 1 fax

mode on receipt of AT+FCLASS=1;

AT+FCLASS=2 initiates Fax Class 2.

Fax commands and responses are

issued at 19,200 bits per second; the

character format is 8 bits no parity. Fax

commands are valid only in fax mode.

The A/, ATO, AT&T and escape

commands are not valid in fax mode.

Commands

AT command lines must follow a strict

format. The command line is stored in the

command buffer and executed upon receipt

of a carriage return. Until executed, the

command line can be edited with the

backspace key.

Command Prefix - Each command, except

for the A/ command, begins with the AT

prefix. The "A" and "T" may be either both

caps or both lower case but cannot be of

different cases. The prefix identifies the

speed and parity of the commands sent by

the host. The modem determines speed by

measuring the width of the incoming bits and

parity by comparing the parity bits of the "A"

and the "T." The XE2814 returns result

codes at the speed and parity of the host.

Command Line - Multiple commands may

be placed in a command line. Commands

are executed in the sequence they appear.

Spaces, inserted to improve legibility, do not

fill space in the command buffer. A carriage

return terminates the command line and

causes the commands to be executed.

Register S3 allows the user to select a

character other than a carriage return to

terminate the command line.

Command Buffer - The command buffer

can hold only 40 characters, including the

AT prefix. If the command buffer overflows,

the modem issues an "ERROR" result code

and commands are not executed.

XE2814

XECOM\5

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