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XE3301F

Multi-National 33,600 BPS Modem Module

Xecom 

XE3301 AT Commands

Modes of Operation

The XE3301 uses "AT" commands for control and

configuration. The XE3301 operates in three

modes; Command Mode, Fax Mode and Data

Mode. Extensions to the AT command set support

fax operation.

Data Mode: The modem enters data mode after it

establishes a link and issues a "CONNECT" result

code. In Data Mode the modem modulates all

signals on Transmit Data, Pin 13, and sends them

to the remote modem. The modem demodulates

the signal from the remote modem and places it

onto Received Data, Pin 3, for the host equipment.

When the modem exits data mode, it issues a "NO

CARRIER" result code.

Command Mode: The XE3301 enters command

mode on application of power, reset, loss of the

connection, or receipt of the escape sequence. In

command mode the modem accepts commands

from the host on Transmit Data. Appropriate

result codes are returned on Received Data at the

same speed and parity as the commands.

Command Format - Each command, except A/,

begins with the AT prefix. The "A" and "T" may be

both upper case or both lower case but cannot be

of different cases. The modem uses the prefix to

identify the host's speed and parity. The modem

determines speed by measuring the width of the

incoming bits and parity by comparing the parity

bits of the "A" and "T." The modem then returns

result codes at the host's speed and parity.

Command Line - A command line may include

multiple commands. The modem executes the

commands in the sequence they appear in the

command line. 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 holds 40

characters, including the AT prefix. If it overflows,

the modem issues an "ERROR" result code and

commands are not executed.

Fax Mode: The modem enters fax mode on

receipt of the AT+FCLASS=1 command. Fax

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 in fax mode. The A/, ATO, AT&T

and escape commands are not valid in fax mode.

Commands

The modem is configured and controlled with AT

commands. AT commands 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 Line Editing - A backspace can be

used to edit the command any time before it is

executed. The backspace character, Control and

H simultaneously on some systems, erases the

previous character in the command line. Any

character except for the "A" and "T" can be erased.

Register S5 allows the user to select a character

other than a backspace to edit the command line.

Re-Execute Last Command - The A/ command

causes the modem to re-execute the command

line stored in the command buffer. This is the only

command which does not require the "AT" prefix.

Omitted Parameters - Most commands include a

parameter which determines the command

function. When the parameter is omitted from the

command string, it is assumed to be a 0.

XECOM

(6)

XE3301

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