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PDF XE2486 Data sheet ( Hoja de datos )
| Número de pieza | XE2486 | |
| Descripción | Miniature 2400 bps Modem Module | |
| Fabricantes | ETC | |
| Logotipo |  |
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xecom
Miniature 2400 bps Modem Module
XE2486
8-97
Description
Xecom's XE2486 is a miniature, low cost 2400 bit
per second modem. It provides a complete
modem, including necessary memory and the
DAA in a package just 1.0 inch by 1.25 inches.
User transferable FCC Part 68 registration is
included.
The XE2486 was specifically designed to provide
OEM system designers with a quick, easy and
low-cost way to integrate a 2400 bits per second
modem. Industry standard "AT" commands
provide modem control and configuration. The
XE2486 interfaces with the system host through a
TTL level, serial interface.
Features
• Supported Protocols: V.22bis, V.22, V.21, Bell
212A and 103
• "AT" commands for modem control and
configuration.
• Small Size: 1.25 inches long, 1.0 inches
wide, 0.50 inches high.
• NVRAM stores commonly dialed numbers
and custom modem configurations
• Single +5V supply
• Low power CMOS:
Operating: 200 mW (Typ.)
Sleep mode: 50 mW (Typ.)
Serial I/O
TXD
RXD
\DTR
\DSR
\RI
\CTS
\DCD
Auxilliary I/O
TXA
RXA
\V-D
\HS
RST
\SLEEP
Modem
Controller
Block Diagram
VCC
ROM
NVRAM
Analog
Front End
DAA
Tip
Ring
SPK
Gnd
XECOM
XE2486
1 page  
AT Commands
Modes of Operation
The XE2486"AT" commands provide two
operational modes in the XE2486; Command
Mode and Data Mode.
Data Mode: The XE2486 enters data mode after
it establishes a modem link and issues a
"CONNECT" result code. In Data Mode the
modem transmits all signals on Transmit Data
(TXD) to the remote modem and puts data from
the remote modem onto Received Data (RXD).
When the modem exits data mode, it issues a "NO
CARRIER" result code.
Command Mode: The XE2486 enters command
mode on power-up, reset, a lost connection, or
escape code receipt. In command mode the
modem accepts commands from the host on
transmit data. The modem returns appropriate
responses on received data.
Command Line Format
Command lines issued to the modem follow a
strict format. The ATprefix begins each command.
The command buffer stores the command line
which is executed upon receipt of a carriage
return. Until executed, the command line can be
editied with a backspace.
Command Prefix - Each command 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 prefix identifies the speed and parity of
the host. The modem measures the width of
incoming bits to determine speed and compares
parity bits of the two characters to determine parity.
Command Line - A command line may include a
series of commands. The modem executes such
commands in the sequence they appear. A
carriage return terminates the command line and
executes the commands. Register S3 allows
selection of another character to terminate the
command line.
Command Buffer - The command buffer holds a
maximum of 40 characters, including the AT
prefix. Space inserted into the command line do
not fill space in the command buffer. Attempting to
load a longer command line causes the modem to
issue an "ERROR" result code and the commands
are not executed.
Command Line Editing - A backspace can be
used to edit the command line beforeexecution.
The backspace erases the previous character in
the command line. Register S5 allows selection of
a character other than a backspace to edit the
command line.
Re-Execute Last Command - An "A/" causes the
modem to re-execute the last command line. This
command which does not require the "AT" prefix.
Ommitted Parameters - Most commands include a
parameter which determines how the functions will
be set. When this parameter is omitted from the
command string, it is assumed to be a 0.
Escape Characters - A 3-character escape
sequence switches the modem from data to
command mode while remaining on line. The
escape character, Register S2, must be entered 3
times in succession within a 1 second guard time
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 all
together. 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 preceed and follow
each result code.
XECOM
(5) XE2486
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet XE2486.PDF ] | |
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