XE1401I 데이터 시트보기 (PDF) - Xecom

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XE1401I

Multi-National 14,400 BPS Embeddable Modem

Xecom 

XE1401 AT Commands

Modes of Operation

Command Line - A command line may include multiple com-

The XE1401 uses "AT" commands for control and configura- mands. The modem executes the commands in the sequence

tion. The XE1401 operates in three modes; Command

they appear in the command line. Spaces, inserted to improve

Mode, Fax Mode and Data Mode. Extensions to the AT

legibility, do not fill space in the command buffer. A carriage

command set support fax operation.

return terminates the command line and causes the commands to

Data Mode: The modem enters data mode after it estab-

be executed. Register S3 allows the user to select a character

lishes a link and issues a "CONNECT" result code. In Data other than a carriage return to terminate the command line.

Mode the modem modulates all signals on Transmit Data, Command Buffer - The command buffer holds 40 characters,

Pin 13, and sends them to the remote modem. The modem including the AT prefix. If it overflows, the modem issues an

demodulates the signal from the remote modem and places it "ERROR" result code and commands are not executed.

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

modem exits data mode, it issues a "NO CARRIER" result Command Line Editing - A backspace can be used to edit the

code.

command any time before it is executed. The backspace charac-

ter, Control and H simultaneously on some systems, erases the

Command Mode: The XE1401 enters command mode on previous character in the command line. Any character except

application of power, reset, loss of the connection, or receipt for the "A" and "T" can be erased. Register S5 allows the user

of the escape sequence. In command mode the modem ac- to select a character other than a backspace to edit the command

cepts commands from the host on Transmit Data. Appropri- line.

ate result codes are returned on Received Data at the same

speed and parity as the commands.

Re-Execute Last Command - The A/ command causes the mo-

dem to re-execute the command line stored in the command

Fax Mode: The modem enters fax mode on receipt of the buffer. This is the only command which does not require the

AT+FCLASS=1 command. Fax commands and responses "AT" prefix.

are issued at 19,200 bits per second; the character format is 8

bits no parity. The modem accepts Class 1 Fax commands Omitted Parameters - Most commands include a parameter

only in fax mode. The A/, ATO, AT&T and escape com-

which determines the command function. When the parameter is

mands are not valid in fax mode.

omitted from the command string, it is assumed to be a 0.

Escape Characters - A three character escape sequence, entered

Commands

while in data mode, will switch the modem into command mode

The modem is configured and controlled with AT com-

while remaining on line. The escape character, set by Register

mands. AT commands follow a strict format. The command S2, is entered 3 times in succession to execute the escape. The

line is stored in the command buffer and executed upon re- default escape sequence is "+++."

ceipt of a carriage return. Until executed, the command line

can be edited with the backspace key.

Result Codes - The modem issues a result code after each ac-

Command Format - Each command, except A/, begins with tion. Result codes may be provided as full words, numeric

the AT prefix. The "A" and "T" may be both upper case or codes or may be disabled. Each result code ends with a carriage

both lower case but cannot be of different cases. The modem return when numeric result codes are chosen. When full word

uses the prefix to identify the host's speed and parity. The result codes are chosen, a Line Feed and Carriage Return pre-

modem determines speed by measuring the width of the in- cede and follow each result code.

coming 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.

XECOM

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XE1401

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