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XE9624F

A Complete Send and Receive Fax & Data Modem

Xecom 

AT Commands

The XE9624F and XE9624FS use the Hayes "AT" commands for configuration and control.

Extensions to the AT commands support fax operation. The following section describes how

to use the AT command format and lists the AT commands, Registers and Result codes

used to control modem operation.

Modes of Operation

The "AT" commands have three operational modes; Command, Fax and Data Modes.

Data Mode: The XE9624F/FS enters data mode after it makes a connection with a

remote modem and issues an appropriate "CONNECT" result code. In the Data Mode

the modem sends all data on the Transmit Data line to the remote modem and puts

data from the remote modem onto the Received Data line for the host equipment.

When the modem exits data mode, it issues a "NO CARRIER" result code.

Command Mode: The XE9624F/FS enters command mode on power-up, reset, a lost

connection, or receipt of an escape code. When in command mode, the modem

accepts command line instructions from the host on transmit data. More than one

instruction may be placed on each command line. Appropriate result codes are

returned to the host on received data. The AT commands allow the host to configure

the modem for a specific application.

Fax Mode: The XE9624F/FS enters fax mode after it receives the AT+FCLASS=1

command. In fax mode commands and responses are issued at 19,200 bits per

second; the character format is 8 bits no parity. The modem accepts Class 1 fax

commands only while in the fax mode. The A/, ATO, AT&T and escape commands are

not valid in fax mode.

Command Line Format

Command lines issued to the modem follow a strict format. Each command begins with the

prefix AT. The command line is stored in the command buffer and executed upon receipt of

a carriage return. Untilexecuted, the command line can be editied 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 to the modem by the host.

Speed is determined by measuring the width of the incoming bits. Parity is determined by

comparing the parity bit of the "A" and the "T." Result codes are sent at the speed and

parity determined by the prefix.

XE9624F/XE9624FS

XECOM\5

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