Ramsey DCI2C — DTMF Controller Interface User & Service Manual PDF (EN)

DTMF CONTROLLER INTERFACE Ramsey Electronics Model No. DCI2 Have you ever wished you could call home and turn on the lights late at night before you pull in the driveway? Finally, an easy way to remotely control just about anything with the touch of a button! The DCI2C offers control of up to16 devices using your touch tone phone or any audio signal with DTMF tone signals. User programmable configuration provides latched or non-latched outputs, secure or non-secure access, as well as continuous control of up to 16 devices independent of configuration. A binary format output provides easy control of up to 16 devices.

Key Features • 6 user configurable modes • Continuous 1 of 16 lines decoding of all 16 DTMF tone pairs • Security feature for binary output decoding of all DTMF tone pairs • Binary output configurable to latch on tone reception or active only with tone in either secure or non-secure mode • Crystal controlled DTMF decoder. • Input may be from any DTMF tone source (phone line or other clean audio source) • Audio filtering to reject normal telco signals other than DTMF tones • Special configuration mode to provide remote control of Ramsey Electronics DVMS voice messaging system DCI2 • 1

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DCI2 2 RAMSEY TRANSMITTER KITS • FM100B Professional FM Stereo Transmitter • FM25B Synthesized Stereo FM Transmitter • TV6 Television Transmitter RAMSEY RECEIVER KITS • FR1C FM Broadcast Receiver • AR1C Aircraft Band Receiver • SR2C Shortwave Receiver RAMSEY HOBBY KITS • SG7 Personal Speed Radar • SS70A Speech Scrambler • BS2C “Bullshooter” Digital Voice Storage Unit • AVS10 Automatic Sequential Video Switcher • ECG1C Electrocardiogram Heart Monitor RAMSEY AMATEUR RADIO KITS • DDF1 Doppler Direction Finder • HR Series HF All Mode Receivers • QRP Series HF CW Transmitters • CW7 CW Keyer • CPO3 Code Practice Oscillator • QRP Power Amplifiers RAMSEY MINI-KITS Many other kits are available for hobby, school, Scouts and just plain FUN.

New kits are always under development. Write or call for our free Ramsey catalog. DCI2C INSTRUCTION MANUAL Ramsey Electronics publication No. MDCI2 Rev 1.1 This Printing: March 2009 COPYRIGHT 2008-2009 by Ramsey Electronics, LLC, 590 Fishers Station Drive, Victor, New York 14564. All rights reserved. No portion of this publication may be copied or duplicated without the written permission of Ramsey Electronics, LLC. Printed in the United States of America.

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DCI2 3 Ramsey Publication No.

MDCI2 Price $5.00 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR DTMF CONTROLLER INTERFACE KIT ASSEMBLY AND INSTRUCTION MANUAL FOR TABLE OF CONTENTS Introduction.......................................4 Circuit Description ............................4 Parts Layout Diagram.......................7 Parts List...........................................8 Learn As You Build...........................9 DCI2C Assembly ..............................11 Initial Testing ....................................15 Schematic Diagram..........................18 Case Assembly.................................20 Functionality Description ..................21 Configuring Your DCI2 .....................21 Configuration Sequence Tables.......23,25 Output Signal Description.................24 DVMS Configuration.........................26 Wiring & Custom Applications..........28 Troubleshooting Guide.....................30 DCI2C Specifications .......................32 Warranty...........................................35 RAMSEY ELECTRONICS, LLC 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 www.ramseykits.com

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INTRODUCTION The DCI2 ( D TMF C ontroller I nterface) is designed to meet the needs of the home automation experimenter. The easy hookup interface and simple operation lends itself well to a variety of applications. The DCI2 can be configured by the user to operate in several different modes to meet your specific requirements. A coded binary set of outputs provides either a latched or non-latched data output mode. A special configuration is also provided to interface to the Ramsey Electronics DVMS, ( D igital V oice M essage S ystem), to allow messages to be selected and played using DTMF tones. All configurations may be operated in a secure or non-secure mode.

A set of 16 active low outputs are also provided. These operate independently of the DCI2 configuration and provide continuous monitoring of the input signal. Any valid DTMF tone activates a corresponding output for as long as the tone is present. The DCI2 continually monitors your phone line, or just about any other audio source, listening for any Dual Tone Multi Frequency (DTMF) signals. Another name for these signals is Touch Tones. When the DCI2 detects a valid signal it decodes it and performs the appropriate actions. We’ll now explain in more detail these actions and how the DCI2 operates.

CIRCUIT DESCRIPTION Take a look at the DCI2C’s Schematic Diagram as we walk through the circuit description. We will start with the DTMF audio input and work our way through to the power supply section. The Input The DTMF audio input uses a standard RJ-11 modular phone jack (J6 - Phone Line Monitor In) for easy interfacing with your phone line or other audio source (a direct audio pinout for J6 is shown in the “WIRING AND CUSTOM APPLICATION SUGGESTIONS”) section of this manual. The input circuitry near the phone jack allows the DCI2 to continually monitor the audio signal and detect any DTMF data that comes in so it can be decoded.

The audio sniffer formed by C14, C15, R8, R9, and R10 presents a high impedance to the input signal. This allows connection to the phone line without making it think the phone is off-hook so it will not capture the line and does not interfere with the normal use of your phones. Protection diodes D2 and D3 limit the incoming signal to +/- 0.7 V so that potentially damaging voltages like the 90 Vp-p ‘Ring’ signal do not damage the decoder IC. Capacitor C11 blocks any DC potential that may be present from reaching U3’s input on pin 2 thru R3. DCI2 4

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