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xecom
Miniature 2400 bps Modem Module 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.
XE2486
8-97
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.)
Block Diagram
VCC Serial I/O
TXD RXD \DTR \DSR \RI \CTS \DCD
ROM
NVRAM
Modem Controller Auxilliary I/O
TXA RXA \V-D \HS RST \SLEEP
Tip Analog Front End DAA Ring
SPK
Gnd
XECOM
XE2486
XE2486 Mechanical Specifications
INCHES PIN MIN MAX
A B C D E F G H 1.240 0.990 0.490 0.120 0.090 0.060 0.090 0.790 1.260 1.010 0.510 0.140 0.110 0.080 0.110 0.810
METRIC(MM) MIN MAX
31.50 25.15 12.45 3.05 2.29 1.52 2.29 20.07 32.00 25.65 12.95 3.56 2.79 2.03 2.79 20.57
A
B
Denotes Pin 1
Pins = 0.010 by 0.020 inches
C D
G H
G
F
E
F
Pin Configuration and Descriptions
PIN
1
NAME
Ring
DESCRIPTION
Ring provides half the two-wire connection to the telephone network, RJ-11 Pin 4. A 1500 volt barrier isolates Ring from all other circuits. This isolation must be preserved throughout the system. The battery voltage on Ring may be positive or negative with respect to Tip.
XE2486
RING TIP RXA TXA SPK N/C N/C /SLP N/C TXD RXD 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 N/C RST GND VCC /HS /DCD /CTS /RI /DSR /DTR /V-D
2
Tip
Tip provides half the two-wire connection to the telephone network, RJ-11 Pin 3. A 1500 volt barrier isolates Tip from all other circuits. This isolation must be preserved throughout the system. The battery voltage on Tip may be positive or negative with respect to Ring. Not used; Do not connect any circuitry to these Pins.
3,4
N/A
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XE2486
Pin Descriptions continued
PIN
5
NAME
SPK
DESCRIPTION
SPK provides the audio output to a speaker. Speaker output is controlled by the ATL and ATM commands. The input impedance to the speaker driver must be greater than 300 ohms. No Connection This active low output indicates when the modem is in the sleep mode. No Connection TXD provides serial data input from the host. A logic high represents a "Mark" and a low represents a "Space". RXD provides serial data output to the host. A logic high represents a "Mark" and a low represents a "Space". The Voice-Data ouptut can be used to drive an external relay for switching between the modem and handset connected to the same telephone line. Data Terminal Ready is an active low input to the modem. The AT&D command sets the function of DTR. Data Set Ready is an active low output from the modem. Its operation is determined by the AT&S command. Ring Indicator is an active low output which marks the presence of a ring on the line. Clear to Send is not used on the XE2486; it will remain low at all times. Data Carrier Detect goes low to indicate receipt of a valid incoming carrier. The AT&C1 command enables the carrier detect function. This active low output indicates when the XE2486 has made a 2400 bps connection. VCC provides the +5 volt power required by the modem. Ground provides the common reference for the XE2486. This active high input cause a hardware reset in the XE2486. The reset pulse must be held high for at least 10 milliseconds to correctly reset the modem. No Connection
6, 7 8 9 10
N/C /SLP N/C TXD
11
RXD
12
/V-D
13
/DTR
14
/DSR
15
/RI
16 17
/CTS /DCD
18
/HS
19 20 21
VCC Gnd RST
22
N/C
XECOM
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XE2486
XE2486 Typical Connection Diagram
+5 Volts RJ11 3 4 C1 C2 FB1 FB2
Tip Ring
Reset
XE2486
SPK
GND VCC /HS /DCD /CTS /RI
16C450 UART
/SLP
/DSR /DTR
TXD RXD
V/D
Note: RJ11 Pin assignments reference a 6-pin connector. Tip and Ring are the center pins of all RJ11 jacks.
Recommended Parts
Reference Designation L1, L2 C1, C2 J1 Description Ferrite Beads Capacitors RJ11 Jack Recommended Part Number TDK CB30-1812 Sprague 30GAT47, 470 pfd, 3000 Volts Stewart SS6446NF
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XE2486
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.
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XE2486
AT Command List
An asterisk indicates the factory default A - Answer Command Bn - Select Communications Standard n=0 Selects CCITT standards n=1 Selects Bell standards* D - Dial Command P = Pulse dial T = Tone dial R = Connect as an answering modem W = Wait for dial tone , = Pause for the duration of S8 @ = Wait for silence ! = Switch hook flash ; = Return to the command state En - Command Echo n=0 Do not echo commands n=1 Enable command echo* Hn - Switch Hook Control n=0 Switch hook relay closes* n=1 The switch hook relay opens In - Modem Identification Ln - Speaker Volume n=0 Low speaker volume n=1 Low speaker volume n=2 Moderate speaker volume* n=3 High speaker volume Mn - Speaker Activity n=0 Speaker off n=1 Speaker on until carrier received* n=2 Speaker remains on n=3 Speaker on after dialing until carrier is detected. On - On Line n=0 Return On Line with no retrain* n=1 Initiate retrain while returning On line. Qn - Responses n=0 Send responses * n=1 No Responses Sr? - Interogate Register Sr=n - Set Register Value Vn - Result Codes n=0 Numeric Result Codes n=1 English Word Result Codes* Xn - Result Code Set n=0 Responses 0-4* n=1 Responses 0-5 & 10 n=2 Responses 0-6 & 10 n=3 Responses 0-5, 7 & 10 n=4 Responses 0-7 & 10 Z - Reset &Cn - DCD Operation n=0 DCD is forced active* n=1 DCD indicates a valid carrier signal &Dn - DTR n=0 DTR is ignored by the modem* n=2 Modem disconnects if the host revokes DTR. n=3 The modem performs a soft reset when DTR is revoked. &F - Revert to Factory Defaults &Ln - Line Type n=0 Modem operates on dial-up lines* n=1 Modem operates on leased lines &Qn - Communications Format n=0 Sets the modem for normal, unbuffered operation. &Tn - Test Modes n=0 Exit test mode n=1 Local analog loopback n=3 Initiate local digital loopback n=4 Respond to remote loop request* n=5 Deny remote loop request n=6 Intiate a Remote Digital loopback n=7 Remote digital loopback w self-test n=8 Local analog loopback w self-test &V - View Active Profile &Wn - Store Profile n=0 Stores the current configuration in memory location 0. n=1 Stores the current configuration in memory location 1. &Yn - Recall Profile n=0 Use memory location 0. n=1 Use memory location 1. &Zn=X- Store Number
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XE2486
S-Register Summary
REG.
S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S14 S16 S18 S21 S22 S23 S27
RANGE/UNITS
0-255/rings 0-255/rings 0-127/ASCII 0-127/ASCII 0-127/ASCII 0-32,127/ASCII 2-255/sec 1-60/sec 0-255/sec 1-255/0.1 sec 1-255/0.1 sec Bit Mapped Bit Mapped 0-255/sec Bit Mapped Bit Mapped Bit Mapped Bit Mapped
DESCRIPTION
Number of rings to answer on Count number of incoming rings Escape character Carriage return character Line feed character Backspace character Dial tone wait time Wait time for remote carrier Comma pause time Carrier detect response time Delay from loss of carrier to hang up E,Q,V,T,P,D,A,R accept/ignore Modem loopback tests Modem test timer J, &R, &D, &C, &S, Y L, M, X, &P, &T4, &T5, DTE speed and parity &T4,&T5, DTE speed, parity &Q, &L, &X, B commands
DEFAULT
000 000 043 013 010 008 002 030 002 006 014 170 000 000 000 118 007 064
Result Code Summary
DIGIT
0 1 2 3 4 5 6 7 8 10
CODE
OK CONNECT RING NO CARRIER ErroR Connect 1200 No dial tone Busy No answer Connect 2400
WORD CODE MEANING
Successfully executed command line 300 bps connection established Ring signal detected Carrier not detected within Register S7 detect time Error found in command line; returns to command line 1200 bps connection established No dial tone detected within 5 Sec. after going off-hook Busy signal detected after automatically dialing a call Five seconds of silence was not detected when using the @ command in the Dial command line Connection established at 2400 bps
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XE2486
Electrical Specifications
Absolute MAaximum Ratings*
SUPPLY VOLTAGE - Vcc DC INPUT VOLTAGE STORAGE TEMPERATURE RANGE LEAD TEMPERATURE (Soldering, 2 sec per wave) OPERATING TEMPERATURE RANGE
*Exceeding these values may result in permanent damage to the device.
+6.5 Volts -0.6 Volts to +6.5 Volts -25 C TO +100 C 260 C 0 TO 70 C
Telephone Interface Specifications
PARAMETER
Telephone Line Impedance Match Ring Detect Sensitivity (on hook, Type B ringer) Telephone Loop Current 38 20 100
MIN
TYP
600
MAX
UNIT
ohms Vrms mA
Power Supply Characteristics(TA =
Symbol Parameter
Vcc Icc Iccpd Supply Voltage Vcc Supply Current Power Down Current
0 - 70C, Vcc = 5v 5%)
Min
4.75
Typ
5.0 40 10
Max
5.25
Units
V mA mA
Comments
All outputs Disconnected
Power Management: The XE2486 has an integrated, advanced power management capability. If no activity is
detected on the RXD, DTR, or RI lines the modem will automatically go into a smart power down mode. In this mode power consumption is typically less than 50 milliwatts.
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XE2486
FCC Instructions
This product complies with Part 68 of the FCC Rules. With each device shipped, there is a label which contains, among other information, the FCC Registration Number and Ringer Equivalence Number (REN) for this product. You must, upon request, provide this information to your telephone company. The mounting of this device in the final assembly must be made in such a manner as to preserve the high voltage protection between the TIP/RING and the rest of the system. Typically, this may be accomplished by maintaining a minimum spacing .100 mils between the TIP/RING Traces to the RJ-11C Jack and low voltage portion of the system. No additional circuitry may be attached between TIP/RING and the telephone line connection, unless specifically allowed in the rules. The REN helps determine the number of devices you may connect to a telephone line and still have all of these devices ring when the number is called. In most, but not all areas, the sum of the RENs of all devices connected to one line should not exceed five (5.0). To be certain of the number of devices you may connect to the line, as determined by the REN, you should contact the local telephone company to determine the maximum REN for your calling area. If your system causes harm to the telephone network, the telephone company may discontinue service temporarily. If possible, they will notify you in advance. If advance notification is not practical, you will be notified as soon as possible. Your telephone company may make changes in its facilities, equipment, operations or procedures that could affect proper functioning of your equipment. If they do, you will be notified in advance to give you an opportunity to maintain uninterrupted telephone service. If you experience trouble with this device, please contact XECOM at (408) 945-6640 for information on obtaining service or repairs. The telephone company may ask you to disconnect this device from the network until the problem has been corrected or until you are sure that the device is not malfunctioning. The device may not be used on coin service lines provided by the telephone company (this does not apply to private coin telephone applications which use standard telephone lines). Connection to party lines is subject to state tariffs.
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XE2486
Terms of Sale
Devices sold by XECOM are covered by the warranty provisions appearing in its Terms of Sale only. XECOM makes no warranty, express, statutory, implied, or by description regarding the information set forth herein, or regarding the freedom of the described devices from patent infringement. XECOM makes no warranty of merchantability or fitness for any purposes. XECOM reserves the right to discontinue production and change specifications and prices at any time and without notice. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not recommended without additional processing and authorization by XECOM for such application. Xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xecom product. No other circuits, patents, or licenses are implied.
Life Support Policy
Xecom's products are not authorized for use as Critical Components in Life Support Devices or Systems. Life Support Devices or Systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions provided in the labeling, can be reasonably expected to result in significant injury to the user. A Critical Component is any component of a life support device or system whose failure to perform can be reasonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness.
Copyright, Xecom (c) 1997 While Xecom, Inc. has made every effort to ensure that the information presented here is accurate, Xecom will not be liable for any damages arising from errors or omission of fact. Xecom reserves the right to modify specifications and/or prices without notice. Product mentioned herein are used for identification purposes only and may be trademarks and/or registered trademarks of their respective companies.
xecom
XECOM
Xecom Incorporated 374 Turquoise Street, Milpitas, CA 95035 Ph:408 -945 -66 40 Fax: 408 - 942-1346 E-Mail: info@xecom.com
XE2486

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