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xecom
2400bps Serial Input Component Modem
Description Xecom's XE2401L component modem is a complete 2400 bps data modem. Its compact size and TTL level, serial interface allows for quick integration into virtually any new or existing design. The XE2401L contains all of the circuitry required for complete modem operation, including a user transferable FCC Part 68 registration, allowing direct connection to the Telephone Network. The XE2401L was specifically designed to provide industrial systems manufacturers with a complete, highly integrated, compact solution for adding data communication to their products.
Block Diagram
XE2401L
02-13-96
Features * Small Size 1.08" x 2.28" x 0.42", * FCC Part 68 Registered, user transferable * Data Transfer at 2400, 1200 and 300 bps * Supported Protocols: - CCITT V.22bis, V.22, V.21 - Bell 212A, 103 * TTL serial interface interfaces with industry standard UART's * Single +5v supply * Modem control with Industry standard "AT" command set * Standard package allows easy upgrades to Fax (XE9624F) and 9600 bps (XE9601) operation
PIN CONFIGURATION
Reset AR RXD 1 2 3 40 39 38 +5V \DSR \DCD
(Top View)
DTR\ AA\ CTS\ OH TXD RTS\ HS\ RI\ TIP RING 9 10 11 12 13 14 15 16 18 20 22 21 AMP GND
Mechanical Specifications - Package type 'C2'
PIN A B C D E F G H J K INCHES MIN MAX 2.270 2.290 1.070 1.090 0.420 0.430 0.890 0.910 1.890 1.910 0.125 0.200 0.080 0.100 0.180 0.200 0.090 0.110 0.020 0.025 METRIC(MM) MIN MAX 57.66 58.17 27.18 27.69 10.67 10.92 22.61 23.11 48.01 48.51 03.18 05.08 02.03 02.54 04.57 05.08 02.29 02.79 00.51 00.64 C K F G H J D E METRIC WEIGHT 31.75 grams A ENGLISH 1.12 oz.
B
*
PIN 1 DOT
Pins: 0.025" x 0.025" All pins tin-plated Recommended hole size: 0.056"
Pin Descriptions
PIN NAME
1 RESET
I/O
I
DESCRIPTION
External reset pin active HI, TTL. An internal circuit resets the modem when power is applied, no external reset is required. Any external reset applied to the modem must be applied for a minimum of 100 milliseconds. Auxiliary Data/Voice Relay output, active HI, TTL/CMOS. When high the external, auxiliary telephone set relay is closed and the modem is in the voice mode. Serial data output to the DTE (i.e. external UART). A logic "high" represents a "mark" and a logic "low" represents a "space", TTL. Data Terminal Ready, input, active LO, TTL. The function of this pin is set by the &D command and the value in register S21.
2
AR
O
3
RXD
O
9
\DTR
I
2/XECOM
XE2401L
PIN NAME
10 11 \AA \CTS
I/O
O O
DESCRIPTION
Auto Answer enable indicator, output, active LO, TTL/CMOS. Clear to Send, output, active LO, TTL/CMOS. A low indicates the modem is ready to accept data signals for transmission. Off-Hook, output, active HI, TTL/CMOS. A high indicates the modem's hookswitch relay is closed connecting the modem to the telephone line. Serial data input from the DTE (i.e. external UART). A logic "high" represents a "mark" and a low represents a"space", TTL. Request to Send, input, active LO, TTL. High Speed indicator, output, active LO, TTL/CMOS. Low when operating at 2400bps rate, high otherwise. Ring Indicator, output, active LO, TTL. When low indicates the modem is receiving a ring signal. Tip connection to the phone line (RJ11 pin3) from the internal DAA. Ring connection to the phone line (RJ11 pin4) from the internal DAA. Caution: Observe design rules for Tip & Ring trace layout. Ground. Audio output to speaker. Function is determined by L & M commands and the value in register S22. The imput impdedence to the speaker driver must be greater tha 300 ohms. Data Carrier Detect, output, active LO, TTL/CMOS. Function is set by the &C command and the value in register S21. Data Set Ready, output, active LO, TTL/CMOS. Function is set by the &S command and the value in register S21. +5 Volts.
12
OH
O
13
TXD
I
14 15
\RTS HS
I O
16
\RI
O
18 20 21 22
TIP RING GND AMP
---------
38
\DCD
O
39
\DSR
O
40
Vcc
---
Note: No other pin positions are present, i.e. only 18 physical pins are on this device. No pins are present at positions 4, 5, 6, 7, 8, 17, 19, 23 - 37
XE2401L
XECOM\3
AT Commands
The XE2401L uses "AT" commands for configuration and control. This section describes use of the AT command format and lists the AT commands, Registers and Result codes. Modes of Operation The "AT" commands have two operational modes; Command Mode and Data Mode. Data Mode: The XE2401L enters data mode after it connects with a remote modem and issues an appropriate "CONNECT" result code. In the Data Mode the modem sends all data presented 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 XE2401L enters command mode on power-up, reset, a lost connection, or receipt of the escape code. In command mode the modem accepts commands from the host on transmit data. Appropriate result codes are returned on received data. Command Line Format Command lines issued to the modem follow a strict format. Each command begins with the prefix AT. The command line is stored in the command buffer and executed upon receipt of a carriage return. Until executed, the command line can be editied with the backspace key. Command Prefix - Each command, except the A/ command, begins with the AT prefix. The "A" and "T" may be either both upper case or both lower case but cannot be of different cases. The prefix identifies the speed and parity of the commands sent to the modem by the host. Speed is determined by measuring the width of the incoming bits. Parity is determined by comparing the parity bit of the "A" and the "T." Command Line - Commands may be strung together in a single command line of up to 40 characters. Commands are executed in the sequence they appear. Spaces may be inserted into the command line but 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 - No more than 40 characters, including the AT prefix, may be loaded into the command buffer. If the command buffer overflows, the modem issues an "ERROR" result code and commands are not executed. Command Line Editing - The backspace can be used to edit a command line before it is executed. The backspace key, (Control and H simultaneously on some systems), erases the previous character in the command line. 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 reexecute the last command line. This is the only command which does not require the "AT" prefix. Ommitted Parameters - Most commands include a parameter which determines how the functions will be set. When the command parameter is omitted from the command string, it is assumed to be a 0.
4/XECOM
XE2401L
The XE2401L uses "AT" commands for configuration and control. This section describes use of the AT command format and lists the AT commands, Registers and Result codes. Modes of Operation The "AT" commands have two operational modes; Command Mode and Data Mode.
Data Mode: The XE2401L enters data mode after it connects with a remote modem and issues an appropriate "CONNECT" result code. In the Data Mode the modem sends all data presented 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.
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 Yn - Long Space Disconnect n=0 Disabled * n=1 Enabled
XE2401L
XECOM\5
AT Commands (Continued)
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.
6/XECOM
XE2401L
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
DEFAULT
000 000 043 013 010 008 002 030 002 006 014 170 000 000 000 118 007 064
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
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
XE2401L
XECOM\7
Electrical Specifications
ABSOLUTE MAXIMUM RATINGS*
SUPPLY VOLTAGE - Vcc DC INPUT VOLTAGE STORAGE TEMPERATURE RANGE LEAD TEMPERATURE(Soldering, 2sec/wave) OPERATING TEMPERATURE RANGE +6.5 Volts -0.6 Volts to +6.5 Volts -25 C TO +85 C 260 C 0 TO 70 C
*Exceeding these values may result in permanent damage to the device.
Power Supply Characteristics(TA = 0 - 70C, Vcc = 5v 5%)
Symbol
Vcc Icc Iccpd
Parameter
Supply Voltage Vcc Supply Current Sleep Mode Current
Min Typ Max Units
4.75 5.0 50 10 5.25 80 15 V mA mA
Comments
All outputs Disconnected
I/O Characteristics
Signals
DIGITAL INPUTS \DTR, \RTS, TXD RESET DIGITAL OUTPUTS AR \CTS, \DSR, \DCD OH RXD \RI ANALOG OUTPUTS AMP
Description
CMOS/TTL CMOS/TTL CMOS/TTL CMOS/TTL CMOS/TTL CMOS/TTL CMOS/TTL Zo > 300 ohms
Power Management Specifications/ Issues
The XE2401 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 60 milliwatts.
8/XECOM
XE2401L
Other Performance Specifications
PARAMETER
DTMF Level DTMF Twist (Balance) DTMF Tone Duration Pulse Dialing Rate Pulse Dialing Make/Break Pulse Interdigit Interval Billing Delay Interval Guard Tone Frequency Amplitude Frequency Amplitude High Channel Transmit Amplitude Tone Detection Bandpass Frequency Tone Detection OFF to ON Threshold Tone Detection ON to OFF Threshold Dial Tone Detect Duration Ringback Tone Detect Duration Cadence Busy Tone Detect Duration Cadence
MIN
TYP MAX UNIT
-7.5 70 10 39/61 33/67 785 0 3 dBm dB ms pps % % ms sec. Hz dB Hz dB dB Hz dBm dBm sec. sec. sec. sec. sec.
COMMENTS
USA CCITT
2.0 550 -3 1800 -6 -1 290 -33 -35 3.0 0.75 1.5 0.2 0.67 665
Referenced to high channel transmit
Ref. to low channel guard tone enabled 3 dB point into 600 ohms into 600 ohms
OFF/ON Ratio
1.5
OFF/ON Ratio
Telephone Line Interface Specifications
PARAMETER
Telephone Line Impedance Match Ring Detect Sensitivity (on hook, Type B ringer) Telephone Line Holding Current 38
MIN
TYP
600
MAX
UNIT
ohms Vrms
0
20
100
mA
XE2401L
XECOM\9
Engineering Notes
Capacitors C1, C2 and C3 and Ferrite Beads FB1, FB2, and FB3 prevent radiated emmisions from entering or leaving through the modem's telephone cable. They may be needed for your system to meet FCC Part 15 Rules. These components should be mounted as close to the RJ11 jack as possible. The relay, K1, switches the telephone line to the auxilliary phone jack, J2, so that the phone line can be used by a telephone handset when the modem is not active. The XE2401L inlcudes user tranferrable FCC Part 68 Registration; however, your system design must not introduce any characteristics which cause the Part 68 rules to be violated. Follow design rules carefully to ensure full compliance with FCC Part 68 rules. Xecom recommends a minimum of 0.100" clearance for tip and ring traces. Use PCB materials with a minimum rating of 94V0. This will ensure compliance with FCC 1500V isolation requirements. If this is a problem in your design consult with Xecom's Customer Service engineers for assistance.
10/XECOM
XE2401L
FCC Instructions
This product complies with part 68 of the FCC Rules and Regulations. 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 Connection 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 is useful to determine the quantity 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 you 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.
XE2401L
XECOM\11
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) 1996 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 Incorporated 374 Turquoise Street, Milpitas, CA 95035 Ph:408 -945 -66 40 Fax: 408 - 942-1346 E-Mail: info@xecom.com

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