XE5614L Datasheet, PDF (6/17 Pages) List of Unclassifed Manufacturers – Compact 56 KBPS Modem Module for Embedded Applications

XE5614L AT COMMANDS
Modes of Operation
The XE5614L uses "AT" commands for modem control
and configuration. The XE5614L 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
establishing a modem link and issues a "CONNECT"
result code. In Data Mode the modem modulates all
signals presented 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 XE5614L 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.
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 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 a
maximum of 40 characters, including the AT prefix. If it
overflows, the modem issues an "ERROR" result code
and commands are not executed.
Command Line Editing - A backspace can be used to
edit the command line any time before it is executed.
The backspace character 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 XE5614L 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.
Escape Characters - A three character escape sequence,
entered while in data mode, will switch the modem into
command mode while remaining on line. The escape
character, set by Register S2, is entered 3 times in
succession to execute the escape. The default escape
sequence is "+++."
Result Codes - The modem issues a result code after
each action. Result codes may be provided as full words,
numeric codes or may be disabled. Each result code
ends with a carriage return when numeric result codes
are chosen. When full word result codes are chosen, a
Line Feed and Carriage Return precede and follow each
result code.
XECOM
(6)
XE5614L