TXE433A Wireless 433MHz RF Link Transmitter/Encoder Module
WIRELESS RF LINK ADVANCED TRANSMIT- TER/ENCODER MODULE
Ramsey Electronics Model No. TXE433A
Need a data transmitter or receiver for your remote wireless application? These compact units are perfect for any project; car alarms, door openers, home security, you name it! Now with new hole spacing and including an address selector switch, it makes going wireless even easier! Powerful +10 dBm output – up to 600’ range! SAW Resonators for high stability – no drift! Compact size with low current demand. 433 MHz license free band. Included 8-dip switches for selection of channel. New hole spacing and jacks for easy soldering and mounting. Automatic tuning – no manual adjustments. Operates on 2.5 to 12 volts DC. Ramsey Customer Use Only Not For Publication
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RAMSEY RECEIVER KITS Ramsey Customer Use nly Not For FR1C FM Broadcast Receiver AR1C Aircraft Band Receiver ABM1 Aircraft Band Monitor AA7C Active Antenna AR2 Aircraft Reciver RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW700 Micro Memory CW Keyer DDF1 Doppler Direction Finder Kit 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. TXE433A WIRELESS TRANSMITTER/ENCODER INSTRUCTION MANUAL Ramsey Electronics publication No. MTXE433A Revision 2.0a First printing: April 2003 This Printing: October 2010 Publication COPYRIGHT 2003-2010 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.
Ramsey Publication No. MTXE433A Price $5.00
INSTRUCTION MANUAL FOR
ADVANCED WIRELESS RF LINK TRANSMITTER MODULE
Ramsey Customer Use Only Not For
TABLE OF CONTENTS Introduction .......................................4 How Encoders and Decoders Work..4 Schematic Diagram...........................6 Antenna Considerations....................8 Hook up diagram...............................9 Conclusion ........................................10 Warranty............................................11
RAMSEY ELECTRONICS, LLC 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 www.ramseyelectronics.com
THE TXE433A This wireless RF transmitter/encoder has a 4 bit data input that will be transmitted and encoded, then decoded by the receiver, RXD433A. The output is CMOS compatible when the unit is run on +5 volts. The “decoder address select” allows you to use one transmitter to control different receivers by giving each receiver a unique address. The decoder chip has eight address lines that can be connected to either +5 volts or ground, making it a simple matter of matching the address select switch on the receiver/decoder module to match the address select switch on the transmitter/encoder. These inputs are also CMOS compatible when run on +5 volts. The transmitter/encoder unit has a “transmit enable” input. When the address pins are set up properly and you are ready to transmit, you must ground the “transmit enable” pin to send the data to the receiver. How Encoders and Decoders work: A wireless remote control system requires a clean input signal to ensure that correct data is received. At all RF frequencies, but especially at the frequencies where unlicensed transmitter operation is allowed, the RF spectrum is cluttered with signals and noise that must be filtered for proper data reception. Rather than use microprocessors to detect and correct errors, an encoder IC and corresponding decoder IC can be used on the transmitter and receiver. A code is generated at the transmitter that must be matched at the receiver before the data is recognized as being valid. This type of system is widely used in wireless control applications since it is a reliable way of ensuring security and eliminating interference. Your garage door opener is an excellent example of such a system. All the openers on your street may be made by the same company, and may even be on the same frequency, but each has an internal code programmed into it so that when you push the button, only your garage door opens. In our TXEA/RXDA modules we use the Holtek HT12 series of ICs to accomplish this encoding/decoding scheme. Following is an explanation of how these IC‘s work. Let’s explore how the data and address lines allow one to control many different outputs for different applications. Because of the versatility of the HT-12E encoder/decoder chips it is possible to program hundreds of possible addresses and transmit to several different receivers using the same transmitter. The HT12E encoders begin a 4-word transmission cycle Ramsey Customer Use Only Not For Publication
when transmit enable is pulled low. This cycle will repeat itself as long as the transmit enable is held low. Once the TE pin is pulled high, the encoder output completes its final cycle then stops. When the decoder chip receives serial data, it compares the address pulses to its address settings and if they are the same, it sends a high to the “data valid”, pin 18. At that point the data is considered valid and sent to the data output pins, 11 through 14. Each individual data line can be used as a separate output to drive individual devices or circuits, or all can be combined using suitable logic gates. Because there are four lines, they are capable of sending/receiving four bits of binary information. This allows a decimal count of 0 to 15. The data is latched, meaning that the information sent stays at the same level until new data is sent, even when the transmit enable is no longer present on the transmitter. If you desire a momentary output, the circuit on the following page is an example of one way to make the data output on your RXD433A momentary. The transmitters and receivers each have 8 address lines that can be pulled high or pulled low. To enable the address lines on the receiver unit they must match the transmitter unit. This gives 256 possible variations in address – imagine 256 receiver units all waiting for the proper signal and ready to be used for different applications! Because the transmitters all use the same frequency you would run into interference if you tried to use more than one transmitter at the same time. We’ve all had this experience when traveling; you’re tuning the radio and happen to be caught between two stations. Each station competes with the other and neither of them comes in clearly. This type of situation would not be welcome when trying to control different functions since any data received would be corrupted. However, since each receiver is “listening for” its own address you can have several receivers on and waiting for the proper address signal to activate. Each receiver module will receive any transmission on its frequency but will reject all but the proper transmission since the address settings don’t match. It is obvious that we must set the address lines on both the transmitter and receiver so that they are the same. This entails tying each line either high or low by running a jumper to either ground or +5 volts. You may want to run wire jumpers for each individual receiver if you’re using more than one but since you only need one transmitter to operate several receivers, the connections you make on the transmitter module should be more easily changed. A simple way to accomplish this is to use DIP switches. One side of the switch is connected to the address pins on the IC, one switch per pin. The other side of the switch should be connected directly to ground. The IC has internal pull-up resistors so that any line not tied to ground is automatically High. Ramsey Customer Use Only Not For Publication
TXE433A SCHEMATIC DIAGRAM
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TXE433A PARTS LAYOUT DIAGRAM
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To pull an address line low, simply flip the switch for that address line. Match the address settings on the desired receiver module and you’re ready to go.
ANTENNA CONSIDERATIONS: The simplest antenna consists of a piece of wire approximately 6 to 7 inches long. If you desire more range you can try a ground plane antenna or a Yagi such as the Ramsey 4004 model. The antenna should be tuned for the 433 MHz band for best operation. Remember that the range you get will depend on terrain, obstructions, and height of antenna. Buildings can reflect RF energy making it difficult or impossible to receive the desired signal. Also, if a reflected signal is “bounced” off of a building or other object, it can be received along with the direct signal. If the reflected signal is out of phase with the direct signal, it is possible for the direct signal to be partially cancelled by the weaker, reflected signal. Since the wavelength of the 433 MHz signal is about two feet, moving the antenna slightly can effect the phase of a reflected signal. The ideal conditions for best transmission and reception are line of sight and outside with no obstructions. Ramsey Customer Use Only Not For Publication
TE Transmit Enable (16): Ground the transmit enable pin to send data to the receiver.
Address lines: Ground individual lines to match RXD433A receiver address
Data lines (9,11,13,15): Input your data here. Data output at RXD433A will match data input to trans- mitter.
ANT: Attach your antenna here. Ramsey Customer Use Only Not For A0 through A7: A0 through A7: These are the address line switches. Individ- ual address lines should be connected to +5 volts or ground to match the RXD433A transmitter address lines. A through D: These are the data input lines. The input to these lines will match the output at the RXD433A transmitter data lines. Transmit Enable: When you are ready to transmit, ground the transmit enable pin to begin sending data to the receiver. Publication V+ (10): Attach your power source here. G (12,14): Attach your power sup- ply ground here.
BASIC CONNECTION The following shows how to connect your TXE433A for as simple as possible operation. You may want to get fancier, but this will get you started.
CONCLUSION We sincerely hope that you will enjoy the use of this Ramsey product. As al- ways, we have tried to compose our manual in the easiest, most “user friendly” format that is possible. As our customers, we value your opinions, comments, and additions that you would like to see in future publications. Please submit comments or ideas to: Ramsey Electronics LLC Attn. Hobby Kit Department 590 Fishers Station Drive Victor, NY 14564 Ramsey Customer Use Only Not For
And once again, thanks from the folks at Ramsey!
THE RAMSEY KIT WARRANTY
TXE433A 11 Please understand that our Tech Support Group personnel are not volunteers! They are a dedicated group of highly trained technicians each configured with a very properly equipped test bench. Upon receipt of a repair, the setup, testing, diagnosis, repair, paperwork, and repacking of your kit requires nearly an hour of their time regardless of the size or complexity of the kit! The minimum repair fee represents ½ hour Tech Support time at $50/hour USD. We try to keep all kit repairs within the realm of the $25 flat rate whenever possible…and trust us; we exceed that time spent on most kits received more often than not! 7. CONTACT INFORMATION AND RETURN ADDRESS: Technical Questions Product Repair & Returns RAMSEY ELECTRONICS, LLC Attn: Tech Support 590 Fishers Station Drive Victor, NY 14564 585-924-4560; 585-924-4886 Fax email@example.com RAMSEY ELECTRONICS, LLC Attn: Repairs 590 Fishers Station Drive Victor, NY 14564 585-924-4560; 585-924-4886 Fax firstname.lastname@example.org Publication The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about your kit. Most problems can be solved without contacting the factory. Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too! All Ramsey kits will work if assembled properly. The very fact that your kit includes this new man- ual is your assurance that a team of knowledgeable people have field-tested several "copies" of this kit straight from the Ramsey Inventory. If you need help, please read through your manual carefully. All information required to properly build and test your kit is contained within the pages! 1. DEFECTIVE PARTS: It's always easy to blame a part for a problem in your kit, Before you conclude that a part may be bad, thoroughly check your work. Today's semiconductors and pas- sive components have reached incredibly high reliability levels, and it’s sad to say that our human construction skills have not! But on rare occasions a sour component can slip through. All our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days from the date of purchase. Defective parts will be replaced promptly at our expense. If you suspect any part to be defective, please mail it to our factory for testing and replacement. Please send only the defective part(s), not the entire kit. The part(s) MUST be returned to us in suitable condition for testing. Please be aware that testing can usually determine if the part was truly de- fective or damaged by assembly or usage. Don't be afraid of telling us that you 'blew-it', we're all human and in most cases, replacement parts are very reasonably priced. 2. MISSING PARTS: Before assuming a part value is incorrect, check the parts listing carefully to see if it is a critical value such as a specific coil or IC, or whether a RANGE of values is suitable (such as "100 to 500 uF"). Often times, common sense will solve a mysterious missing part prob- lem. If you're missing five 10K ohm resistors and received five extra 1K resistors, you can pretty much be assured that the '1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied with the basic kit by Ramsey, please write or call us with infor- mation on the part you need and proof of kit purchase. 3. FACTORY REPAIR OF ASSEMBLED KITS: To qualify for Ramsey Electronics factory repair, kits MUST: 1. NOT be assembled with acid core solder or flux. 2. NOT be modified in any manner. 3. BE returned in fully-assembled form, not partially assembled. 4. BE accompanied by the proper repair fee. No repair will be undertaken until we have received the MINIMUM repair fee (1/2 hour labor) of $25.00, or authorization to charge it to your credit card account. 5. INCLUDE a description of the problem and legible return address. DO NOT send a separate letter; include all correspondence with the unit. Please do not include your own hardware such as non-Ramsey cabinets, knobs, cables, external battery packs and the like. Ram- sey Electronics, LLC, reserves the right to refuse repair on ANY item in which we find excessive problems or damage due to construction methods. To assist customers in such situations, Ramsey Electronics, LLC, reserves the right to solve their needs on a case-by-case basis. The repair is $50.00 per hour, regardless of the cost of the kit. Please understand that our techni- cians are not volunteers and that set-up, testing, diagnosis, repair and repacking and paperwork can take nearly an hour of paid employee time on even a simple kit. Of course, if we find that a part was defective in manufacture, there will be no charge to repair your kit (But please realize that our technicians know the difference between a defective part and parts burned out or dam- aged through improper use or assembly). 4. REFUNDS: You are given ten (10) days to examine our products. If you are not satisfied, you may return your unassembled kit with all the parts and instructions and proof of purchase to the factory for a full refund. The return package should be packed securely. Insurance is recom- mended. Please do not cause needless delays, read all information carefully. 1. GENERAL: Notice that this is not a "fine print" warranty. We want you to understand y ur rights and ours too! All Rams y kits will work if assembled properly. The very fact that your kit includes this new manual is your assurance that prior to release of this kit, a varied group of knowledgeable people have assembled this kit from scratch using this manual. During this process, changes and additions are noted by each assembler and integrated into the final version of the manual…which you have! If you need help, please read through your manual carefully, all information required to properly build and test your kit is contained within the pages! However, customer satisfaction is our goal, so in the event that you do have a problem, please note the following: 2. DEFECTIVE PARTS: It's always easy to blame a part for a problem in your kit. Before you conclude that a part may be bad, thoroughly check your work. Today's semiconductors and passive components have reached incredibly high reliability levels, and it’s sad to say that our human construction skills have not! But on rare occasions a sour component can slip through. All of our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days from the date of purchase. Defective parts will be replaced pro ptly at our expense. If you suspect any part to be defective, please mail it to our factory for testing and replacement. Please send only the defective part(s), not the ent re kit. The part(s) MUST be returned to us in s itable condition for testing. Please be aware that testing can usually determine if the part was truly defective or damaged by assembly or usage. Don't be afraid of telling us that you “damaged it” or “burned it out”, we're all human and in most cases, replacement parts are very reasonably priced. Remember, our goal for over three decades is to have a happy customer, and we’re here to work WITH you, not AGAINST you! 3. MISSING PARTS: Before assuming a part value is missing, check the parts listing carefully to see if it is a critical value such as a specific coil or IC, or whethe a RANGE of values is suit ble for t e component (such a a "100 to 500 uF capaci or"). Often times, common sense will solve a mysterious missing part problem. If you're missing five 10K ohm resistors and received five extra 1K resistors, you can pretty much be assured that the “1K ohm” resistors are actually the “missing” 10 K parts ("Hum-m-m, I guess the orange band really does look red!") Ramsey Electronics project kits are packed with pride in the USA by our own staff personnel. While separate QC checks are made on all product kits, we too are human, and once in a great while there is a chance something can get through those checks! If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual for your Ramsey kit, pl ase ontact us with information on the part you need. Contact our Repair Department via telephone, email or writi g. Pl ase have your invoice number and date of purchase handy. 4. REFUNDS: All Ramsey products, kit or factory assembled unit have n unconditional 10 day (from the date of purchase) return policy to examine our products. If you re not satisfied for any reason, you ay return your u as embled kit with all the p rts and instructions, or your factory assembled and tested product, together with your proof of purchase to the factory for a full refund less shipping. The return package should be packed securely. Insurance and tracking is highly recommended. A reminder, this applies to unassembled kits. They must be in the same new condition as received, not partially ass mbled! Assembled kits c nnot be returned for credit. No RMA’s are required; simply return to Ramsey Electronics LLC, Attn: Product Returns, 590 Fishers Station Drive, Victor, NY, 14564. If you have any questions, please contact us at 585-924-4560. 5. FACTORY REPAIR OF ASSEMBLED KITS: Most of us at Ramsey are technically oriented and we do realize that things happen! Even following the best practices, with all of the best intentions, there is that chance that your kit doesn’t work when you have completed it. Each manual goes into detailed troubleshooting based on the specific kit to help you troubleshoot the problem. We have found that 95% of returned kits involved wrongly installed components (wrong part or backwards polarity). This section of the warranty assumes you have gone through all those steps, and have now reached the point that you need to send it back. To qualify for factory repair of custom r assembled kits, the following conditions apply: 1. Kits must not be assembled with acid solder flux 2. Kit boards or circuits must not be modified in any manner from the version received 3. Kits must be fully assembled, not partially assembled. Our warranty does not include “finishing” your kit! 4. Must include a full description of the problem encountered including the troubleshooting steps yo have alre dy done. 5. Must not include non-standard, non-Ramsey accessories, cases, enclosures, knobs, etc. or any batteries. 6. Must include the minimum repair fee of $25 USD in the form of check, money order or credit card authorization. 7. Ramsey Electronics, LLC reserves the right to refuse any repair due to excessive errors in construction methods. 8. If, du to customer construction methods, the r pair is estimated t exce d the minimum flat ra e, Ramsey Electronics, LLC will contact the custo er to discuss the repairs needed and to receive authorization and payme t for repair prior to repair. 9. In the unlikely case that a defective part is found to be the cause of the problem, the repairs will be made at no-charge to the customer, and any paym nts received f r repair will be returned or cr dited back to the customer. 10. Properly pack your kit, insure the package, and use a carrier that can be tracked. Ramsey Electronics, LLC is not responsible for any loss or damage in shipment. Send the package together with your repair fee to the return address below. No RMA is required. 6. FACTORY REPAIR FEES: Ramsey Customer Use Only Not For
Price: $5.00 Ramsey Publication No. MTXE433A Assembly and Instruction manual for: RAMSEY MODEL NO. TXE433A Ramsey Customer Use Only Not For
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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