XE3386L Datasheet, PDF (6/16 Pages) List of Unclassifed Manufacturers – Compact 33,600 BPS Data and Fax Modem

XE3386L AT Commands
Modes of Operation
The XE3386L has three operational modes; Command,
Fax and Data.
Data Mode: The XE3386L enters data mode after it
establishes a connection and issues a "CONNECT" result
code. In the Data Mode the modem sends all signals on
Transmit Data to the remote modem and puts data from
the remote modem onto Received Data for the host
equipment. When the modem exits data mode, it issues a
"NO CARRIER" result code.
Command Mode: The XE3386L enters command mode
on power-up, 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.
Fax Mode: The XE3386L enters Class 1 fax mode on
receipt of AT+FCLASS=1. 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
fax commands only in fax mode. The A/, ATO, AT&T
and escape commands are not valid in fax mode.
Command Line Format
Commands sent to the modem follow a strict format.
Each command line begins with the prefix AT. The
modem stores the command line in the command buffer
and executes it upon receipt of a carriage return. Until
executed, a backspace edits the command line.
Command Prefix - The "A" and "T" command prefix
may be both upper or both lower case but cannot be of
different cases. The prefix identifies the speed and parity
of 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 "T." The XE3386L
normally sends result codes at the speed and parity
determined by the prefix.
Command Buffer - The command buffer accepts only
40 characters, including the AT prefix. If the command
buffer overflows, the modem issues an "ERROR" result
code and does not execute the commands.
Command Line Editing - The backspace edits the
command line. Hitting the backspace key, or Control and
H simultaneously on some systems, erases the previous
character in the command line. All characters can be
erased except for the "A" and "T." 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 last command line. This is
the only command that does not require the "AT" prefix.
Omitted Parameters - Most commands include a pa-
rameter which determines the command function. If the
command omits the parameter, he modem assumes the
parameter is a zero.
Escape Characters - A three character escape sequence
switches the modem from data mode to command mode
while remaining on line. The escape character, set by
Register S2, must be 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. The modem sends result codes as full
words, numeric codes or the user may disable the result
codes. Each result code ends with a carriage return when
the user chooses numeric result. The modem terminates
full word result codes with a Line Feed and Carriage
Return.
Command Line - One command line may include
multiple commands. The modem executes commands in
the sequence they appear. Spaces inserted into the
command line 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.
XECOM
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XE3386L