Datenblatt-pdf.com


XE3314B Schematic ( PDF Datasheet ) - Xecom

Teilenummer XE3314B
Beschreibung Modem Module
Hersteller Xecom
Logo Xecom Logo 




Gesamt 17 Seiten
XE3314B Datasheet, Funktion
www.DataSheet4U.com
XE3314B
June 2000
Low-Cost, Embeddable 33,600 BPS Modem Module
Description
Xecom's XE3314B is a complete, low-cost 33,600 bps
modem in a single component. The XE3314B includes a
transferrable FCC Part 68 Registration and is a UL1950
recognized component.
The XE3314B is a complete modem and includes the
DAA. XE3314B users do not need to add RAM, ROM,
Crystals, transformers, or switches to complete the
modem design. The user only needs to provide the TTL
level, serial interface and the telephone jack.
Features
* FCC Part 68 Registration transferrable to customer’s
system
* UL1950 Recognized Component
* Small Size: 2.75 inches by 1.38" by 0.42"
* Modem Control and Configuration through industry
standard AT Commands.
* Modem Protocols: V.34bis, V.34, V.32bis, V.32,
V.22bis, V.22, V.21, Bell 212A and 103
The XE3314B is a full-featured modem. Besides 33.6
Kbps data transfer, the XE3314B supports data compres-
sion, error correction and fax transfer. The XE3314B
also includes NVRAM for permanent storage of the
modem configuration.
The XE3314B is pin compatible with Xecom's XE1414B
modem. This family of modems permits a simple
upgrade path from 14400 bps to 33,600 bps.
* Fax Protocols: V.17, V.29, V.27ter, and V.21 channel 2
* Error Correction; V.42, MNP2-4 and MNP10
* Data Compression; V.42bis and MNP5 provides a
maximum effective data rate of 133,400 bps.
* Pin compatible with Xecom's XE1414B, XE1414C,
XE3314C and XE5614C.
Serial I/O
/DTR
/RTS
/CTS
/DSR
TXD
RXD
/DCD
Auxiliary I/O
RESET
AR
OH
AMP
Modem
Controller
Block Diagram
ROM
NVRAM
Analog
Front
End
DAA
Tip
Ring
XECOM
(1) XE3314B






XE3314B Datasheet, Funktion
XE3314B AT Commands
Modes of Operation
The XE3314B uses "AT" commands for control and
configuration. The XE3314B operates in three modes;
Command Mode, Fax Mode and Data Mode. Exten-
sions to the AT command set support fax operation.
Data Mode: The modem enters data mode after it es-
tablishes 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 Line - A command line may include mul-
tiple 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 ex-
ecuted. 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.
Command Mode: The XE3314B enters command
mode on application of power, reset, loss of the con-
nection, or receipt of the escape sequence. In com-
mand mode the modem accepts commands from the
host on Transmit Data. Appropriate result codes are re-
turned 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 re-
sponses are issued at 19,200 bits per second; the char-
acter 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 com-
mands. AT commands follow a strict format. The
command line is stored in the command buffer and ex-
ecuted upon receipt of a carriage return. Until ex-
ecuted, the command line can be edited with the back-
space key.
Command Format - Each command, except A/, begins
with the AT prefix. The "A" and "T" may be both up-
per 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 mo-
dem then returns result codes at the host's speed and
parity.
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 se-
lect a character other than a backspace to edit the com-
mand 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 com-
mand which does not require the "AT" prefix.
Omitted Parameters - Most commands include a pa-
rameter 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 se-
quence, entered while in data mode, will switch the mo-
dem 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 es-
cape 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 cho-
sen, a Line Feed and Carriage Return precede and fol-
low each result code.
XECOM
(6) XE3314B

6 Page









XE3314B pdf, datenblatt
XE3314B Modem Registers (continued)
S27 General Bit-Mapped Options: S27 reflects the S32 XON Character: S32 determines the ASCII charac-
state of several "AT" commands.
ter to be sent as XON for in-band flow control.
Bit 0 1 3
Range: 0 to 255
0 0 0 = Normal Mode (AT&Q0)
Units ASCII Character
1 0 1 = Error control enabled (AT&Q5)
Default 11 (VT)
0 1 1 = Direct Mode (AT&Q6)
Bit 2, 4-5, 7 Not Used
S33 XOFF Character: S32 determines the ASCII char-
Bit 6 0 = CCITT Protocols (ATB0)
acter to be recognized as XOFF for in-band flow con-
1 = Bell Protocols (ATB1)
trol.
Range: 0 to 255
S28 Pulse Dialing Bit-Mapped Options: S28 stores the
Units ASCII Character
modem's pulse dialing configuration.
Default 19 (DC3)
Bit 0-2, 5-7 Not Used
Bit 3-4 0 = Make/Break ratio 39%/61%; 10
S36 LAPM Failure: S36 instructs the modem what to do
pulses per second (AT&P0)
if the error control negotiations fail.
1 = Make/Break ratio 33%/67%; 10
Bit 0-2 0 = Modem Disconnects
pulses per second (AT&P1)
1 = Establish Direct Connection
2 = Make/Break ratio 39%/61%; 20
3 = Establish normal Connection
pulses per second (AT&P2)
4 = Disconnect if MNP handshake fails
3 = Make/Break ratio 33%/67%; 20
5 = Establish Direct Connection if
pulses per second (AT&P3)
MNP handshake fails.
7 = Establish Normal Connection if
S29 Hook Flash Timer: S29 determines the length for
MNP handshake fails.
time the modem closes its off-hook relay on receipt of
Bit 3-7 Not Used
the "!" dial modifier to simulate a switch hook flash.
Range: 0 to 255
S38 Forced Disconnect Timer: S38 sets the delay be-
Units 10 milliseconds
tween receipt of the command to disconnect and the
Default 70
actual opening of the switch hook. If S38 is set to
255 the modem disconnects only after its buffers are
S30 Disconnect on Inactivity Timer: S30 sets the
empty.
periond the modemis idle before it disconnects . A 0
Range: 0 to 255
disables the inactivity timer.
Units 1 Second
Range: 0 to 255
Default 20
Units 10 Seconds
Default 0
S39 Flow Control Bit-Mapped Options: S39 shows the
modem's flow control status, AT&K.
S31 General Bit-Mapped Options: S31 stores the status
Bit 0-2 0 = Flow Control Disabled
of various AT commands.
3 = Hardware Flow Control, RTS/CTS
Bit 0
0 = No single-line Connect messages
4 = In-Band Flow Control XON/XOFF
(AT\V0)
5 = Transparent In-Band Flow Control
1 = Use single-line connect messages
6 = Both Hardware and In-Band Flow
(AT\V1)
Control
Bit 1
0 = No Automode detection (ATN0)
Bit 3-7 Not use
1 = Automode detection active (ATN1)
Bit 2-3 0 = Report host speed (ATW0)
1 = Report all parameters (ATW1)
2 = Report modem speed only (ATW2)
Bit 4-7 Not Used
XECOM
(12) XE3314B

12 Page





SeitenGesamt 17 Seiten
PDF Download[ XE3314B Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
XE3314BModem ModuleXecom
Xecom
XE3314LCompact 33.6 KBPS Modem ModuleXecom
Xecom

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche