OEM Transmitter Evaluation Kit User's Guide
Contents
1. TECHNOL GIES OEM Transmitter Evaluation Kit User s Guide Wireless made simple Warning Some customers may want Linx radio frequency RF products to control machinery or devices remotely including machinery or devices that can cause death bodily injuries and or property damage if improperly or inadvertently triggered particularly in industrial settings or other applications implicating life safety concerns Life and Property Safety Situations NO OEM LINX REMOTE CONTROL OR FUNCTION MODULE SHOULD EVER BE USED IN LIFE AND PROPERTY SAFETY SITUATIONS No OEM Linx Remote Control or Function Module should be modified for Life and Property Safety Situations Such modification cannot provide sufficient safety and will void the product s regulatory certification and warranty Customers may use our non Function Modules Antenna and Connectors as part of other systems in Life Safety Situations but only with necessary and industry appropriate redundancies and in compliance with applicable safety standards including without limitation ANSI and NFPA standards It is solely the responsibility of any Linx customer who uses one or more of these products to incorporate appropriate redundancies and safety standards for the Life and Property Safety Situation application Do not use this or any Linx product to trigger an action directly from the data line or RSSI lines without a protocol or encoder decoder to validate the dat2. creates optimized designs with RF components and firmware selected for the customer s application Call 1 800 736 6677 1 541 471 6256 if outside the United States for more information Antenna Factor Antennas ooo cccccccccceccenessssececeeeenntnteeeeeen Linx s Antenna Factor division has the am zi A industry s broadest selection of antennas AntennaF OULUI for a wide variety of applications For customers with specialized needs custom antennas and design services are available along with simulations of antenna performance to speed develooment Learn more at www linxtechnologies com 11 LINX LEGHANVULUGTES Linx Technologies 159 Ort Lane Merlin OR US 97532 Phone 1 541 471 6256 Fax 1 541 471 6251 www linxtechnologies com Disclaimer Linx Technologies is continually striving to improve the quality and function of its products For this reason we reserve the right to make changes to our products without notice The information contained in this Data Guide is believed to be accurate as of the time of publication Specifications are based on representative lot samples Values may vary from lot to lot and are not guaranteed Typical parameters can and do vary over lots and application Linx Technologies makes no guarantee warranty or representation regarding the suitability of any product for use in any specific application It is the customer s responsibility to verify the suitability o
3. 5 Ordering Information Ordering Information Part Number Description EVAL HHCP Compact Handheld Basic Evaluation Kit EVAL HHLR Long Range Handheld Basic Evaluation Kit EVAL KEY Keyfob Basic Evaluation Kit 315 418 Standard or 433MHz Number of buttons 1 to 5 Figure 2 Ordering Information OEM Transmitter Button Assignments CMD HHCP CMD KEY CMD HHLR Figure 3 OEM Transmitter Button Assignments DS Series Receiver Decoder Evaluation Board i ot ek cb cb KRwWNDNM O H Ot OF OI OS DS SERES DECODER EVALUATION BOARD We i WWW E ew S IER PFF Bio c 2012 WC RS VY Figure 4 DS Series Decoder Evaluation Board Battery 8VDC use 2 AAA style batteries Power Switch Power On Indicator LED Prototyping Area Breakout Header LR Series Receiver Module DS Series Encoder Decoder Reverse Polarity SMA Antenna Connector LEDs D1 D7 Buzzer DO Protocol Selection Switch Data and Address Line Interpretation Configuration Switches Address Configuration DIP Switch Valid Transmission Received LED Theory of Operation OEM Transmitters OOOO Linx OEM transmitters are a great way to quickly bring a remote control product to market They are fully assembled and certified eliminating the need for design tooling and certification Linx can also customize the transmitters with customer specific art logos or switch layouts T
4. The CMD Key transmitter does not support serial protocol The protocols are not interoperable so the switches must be set the same on both sides Figure 6 The Evaluation Board Protocol Selection Switch Development Using the Prototyping Area In addition to evaluation functions the boards may also be used for product development The evaluation board features a prototyping area for the addition of application specific circuitry This area has connections to Voc at the top and to ground at the bottom that can be used to power any circuitry that is added Note H added circuitry requires a higher current than can be provided by the batteries the batteries must be removed and the board powered from an external source The holes are plated and set at 0 1 on center with a 0 04 diameter accommodating industry standard SIP and DIP packages The data line outputs Valid Transmission VT and the DATA line from the receiver DIN have been wired out to a header row to the right of the prototyping area This allows easy access for connection to external circuitry Data line DO is connected to a buzzer D1 to D7 and VI are connected to LEDs Using the Boards as a Design Reference Since the OEM transmitters are a finished product most of the designer s work will be incorporating the receiver into the end product The basic evaluation board included in this kit is very simple yet illustrates some important techniques that should be inco
5. a Without validation any signal from another unrelated transmitter in the environment received by the module could inadvertently trigger the action All RF products are susceptible to RF interference that can prevent communication RF products without frequency agility or hopping implemented are more subject to interference This module does not have a frequency hopping protocol built in Do not use any Linx product over the limits in this data guide Excessive voltage or extended operation at the maximum voltage could cause product failure Exceeding the reflow temperature profile could cause product failure which is not immediately evident Do not make any physical or electrical modifications to any Linx product This will void the warranty and regulatory and UL certifications and may cause product failure which is not immediately evident Table of Contents sch sch ck O O O DON NOD Om SS Go N N Introduction Ordering Information OEM Transmitter Button Assignments DS Series Receiver Decoder Evaluation Board Theory of Operation Using the Kit Setting the Address Input Interpretation Selection Switches Selecting the Protocol Development Using the Prototyping Area Using the Boards as a Design Reference Range Testing About Antennas In Closing DS Series Decoder Evaluation Board Schematic Resources OEM Transmitter Basic Evaluation Kit o User s Guide Inx TECHNOLOGIES Figure 1 OEM Tra
6. cation other than the repair replacement or refund limited to the original product purchase price Devices described in this publication may contain proprietary patented or copyrighted techniques components or materials Under no circumstances shall any user be conveyed any license or right to the use or ownership of such items 2015 Linx Technologies All rights reserved The stylized Linx logo Wireless Made Simple WISE CipherLinx and the stylized CL logo are trademarks of Linx Technologies
7. d usage environment Simple range testing can be performed with the transmitter and receiver evaluation board To prepare the board for range testing simply turn it on by switching the power switch to the ON position Pressing DO on the transmitter activates the buzzer on the receiver board while D1 activates the LED As the maximum range of the link in an area is approached it is not uncommon for the signal to cut in and out as the transmitter moves This is normal and can result from other interfering sources or fluctuating signal levels due to multipath Multipath results in cancellation of the transmitted signal as direct and reflected signals arrive at the receiver at differing times and phases The areas in which this occurs are commonly called nulls and simply walking a little further usually restores the signal If this does not restore the signal then the maximum effective range of the link has been reached To achieve maximum range keep objects such as your hand away from the antenna and ensure that the antenna on the transmitter has a clear and unobstructed line of sight path to the receiver board Range performance is determined by many interdependent factors If the range you are able to achieve is significantly less than what is specified for the products being tested then there is likely a problem either with the board or the ambient RF environment in which the board is operating First check the battery switch position
8. ed to ground when cut it is floating Note All address switches ON and all switches OFF are not valid states and are not recognized by the decoder At least one switch must be set differently from the rest Input Interpretation Selection Switches The DS Series was designed to replace an encoder and decoder from Holtek These parts had tri state lines so the address and data lines could be high low or floating The DS can only be high or low so these selection switches are included for backwards compatibility In the case of the OEM transmitters the switches should be set as follows D_CFG to O or down A_CFGO to 0 or down and A_CFG1 to 1 or up Figure 5 These lines are hardwired in the transmitter so must be set on the receiver board to match Please see the DS Series data guide for more information on the input line interpretation Setzt ec a Cen A_CFGI Figure 5 The Evaluation Board Input Interpretation Selection Switches Selecting the Protocol The DS Series encoder decoder offers two over the air protocols Holtek and serial The Holtek selection is used when communicating with other Holtek devices This is a legacy protocol that provides backwards compatibility The serial selection offers a much more reliable protocol that offers better range and response time The protocol is selected by a switch on the HHPC and HHLR transmitter and the Protocol Select Switch on the evaluation board as shown in Figure 6
9. f the part for the intended application NO LINX PRODUCT IS INTENDED FOR USE IN ANY APPLICATION WHERE THE SAFETY OF LIFE OR PROPERTY IS AT RISK Linx Technologies DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IN NO EVENT SHALL LINX TECHNOLOGIES BE LIABLE FOR ANY OF CUSTOMER S INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY FROM ANY DEFECTIVE OR NON CONFORMING PRODUCTS OR FOR ANY OTHER BREACH OF CONTRACT BY LINX TECHNOLOGIES The limitations on Linx Technologies liability are applicable to any and all claims or theories of recovery asserted by Customer including without limitation breach of contract breach of warranty strict liability or negligence Customer assumes all liability including without limitation liability for injury to person or property economic loss or business interruption for all claims including claims from third parties arising from the use of the Products The Customer will indemnify defend protect and hold harmless Linx Technologies and its officers employees subsidiaries affiliates distributors and representatives from and against all claims damages actions suits proceedings demands assessments adjustments costs and expenses incurred by Linx Technologies as a result of or arising from any Products sold by Linx Technologies to Customer Under no conditions will Linx Technologies be responsible for losses arising from the use or failure of the device in any appli
10. he operation of the OEM transmitter is straightforward When a button s is pressed on the OEM transmitter the states of DO to D7 are formatted into packets by an on board encoder IC These encoded packets are sent to a Linx transmitter that through the antenna conveys the data into free space Receiver Decoder Evaluation Board eeeeeeeeeeeeees The receiver board is powered by two AAA batteries A Linx LR Series receiver is used for reception of the transmitted signal This receiver provides exceptional sensitivity allowing the transmitter and receiver to operate at distances of up to 1 000 feet depending on TX model and signal conditions The data recovered by the receiver is decoded by the DS Series set as a decoder If the settings of the 10 position DIP switch on the receiver board match the address setting of the transmitter the data line outputs are updated to match the state of the buttons on the OEM transmitter To demonstrate this one data line on the evaluation board is used to drive a buzzer while the other lines activate LEDs This board also has a prototyping area with all of the receiver and decoder lines brought out to a header Using the Kit Using the kit is straightforward Simply attach the antenna to the board and install the batteries Set the address on the transmitter and on the board to the same settings turn on the power to the board and press a button on the transmitter When DO is pressed the buzzer sounds
11. ibility of the user to ensure that the products are operated in a legal and appropriate manner The purchaser understands that the legal operation may require additional permits approvals or certifications prior to use depending on the country and operation DS Series Decoder Evaluation Board Schematic TP1 TP2 st st lt Q E T AMEGWxXLanvA S ke Q o T Q y a ao AA CS a Q E OO A To 5 7 2A SS e ir z Oo EHNEN EE i N3399 HMC ZI lo Q I gt a o CH lt op gt lu e E ei ZO amp anoh peZ lt LO O zZ Q lt o wt m N kel CH m y T m ke O RXM XXX LR LICAL EDC DS001 V O O O Zz O O Oo gt gt A O 9 I g S O T O ge 6 e D Q lt st s ej z s COLORO 00001 gt sil 9 92 99 99 9 bleee A gt OF GF GF 6 o Figure 7 DS Series Decoder Board Schematic 10 Dip 2 R2 100k Ao R3 100k A1 R7 R4 100k Ao R5 100k A3 a 4 s 6 R8 100k A4 R10 100k A5 R13 100k A6 0 01uF 00 N Ke K K a R14 100k A7 R16 100k Ag R18 100k Ag Resources For technical support product documentation application notes regulatory guidelines and software updates visit www linxtechnologies com For customers who need help implementing Linx modules Linx offers design services including board layout assistance programming certification advice and packaging design For more complex RF solutions Apex Wireless a division of Linx Technologies
12. nsmitter Basic Evaluation Kit Introduction Linx OEM FF transmitters offer a simple efficient and cost effective method of adding remote control and command capabilities to any product The Basic Evaluation Kit provides a designer all the tools necessary to correctly incorporate Linx OEM transmitters and receiver modules into a product The evaluation board serves several important functions e Rapid Evaluation It allows the performance of the transmitters and receivers to be evaluated quickly in a user s environment e Range Testing Using the OEM transmitter and the included development board a simplex transmission is generated that can be used to evaluate the range performance of the products e Prototype Development An on board prototyping area is provided which allows for additional circuitry to be placed directly on the board so that it can act as the first prototype of the product All of the signals are available on a breakout header for easy access e Design Benchmark During the design process of your product the kit provides a known benchmark against which the performance of your own design may be judged The kit includes 2 OEM transmitters 2 DS Series encoders decoders 2 LR Series receivers 2 PCB mount RP SMA connectors 1 development board 1 CW Series antenna 2 AAA batteries and full documentation One part is soldered to the board one extra is for use on the first prototype board 1 Revised 3 18 201
13. rporated into the board layout The receiver s mounting pads extend slightly past the edge of the part This eases hand assembly and allows for better heat conduction under the part if rework is necessary A full ground plane fill is placed on the bottom of the board This ground plane serves three important purposes First Since a quarter wave antenna is employed the ground plane is critical to serve as a counterpoise please see Application Note AN O0500 Antennas Design Application and Performance for details on how a ground plane affects antenna function Second a ground plane suppresses the transfer of noise between stages of a product as well as unintentional radiation of noise into free space Third a ground plane allows for the implementation of a microstrip feed between the module and the antenna The term microstrip refers to a PCB trace running over a ground plane that is designed to serve as a 50 ohm transmission line See the LR Series receiver data guide or the calculator available on our website for details on microstrip calculations Range Testing Complex mathematical models exist for determining path loss in many environments These models vary as the transmitter and receiver are moved from indoor operation to outdoor operation Although these models can provide an estimation of range performance in the field the most reliable method is to simply perform range tests using the transmitter and receiver in the intende
14. s address settings and antenna connection Next measure the receiver s RSSI voltage with the transmitter turned off to determine if ambient interference is present If this fails to resolve the issue please contact Linx technical support About Antennas The choice of antennas is one of the most critical and often overlooked design considerations The range performance and legality of an RF link are critically dependent upon the type of antenna employed Linx offers a variety of antenna styles that can be considered for a design Included with the kit is a Linx connectorized whip antenna that should be connected prior to using the kit Despite the fact the antenna is not centered on the board s ground plane it exhibits an outstanding VSWR of lt 1 7 and suitably demonstrates the module s best practical performance In Closing Here at Linx Wireless Made Simple is more than just our motto it is our commitment A commitment to the highest caliber of product service and support That is why should you have questions or encounter any difficulties using the evaluation kit you ll be glad to know many resources are available to assist you First check carefully for the obvious then visit our website at www linxtechnologies com or call 1 541 471 6256 between 8AM and 4PM Pacific Time to speak with an application engineer Legal Notice All Linx kits are designed in keeping with high engineering standards however it is the respons
15. when S1 S7 are pressed the LEDs turn on When any button DO D7 is pressed on the transmitter the corresponding decoder output DO D7 is active high Voo on the prototyping header Note All switches address protocol select and interpretation configuration must match on both the transmitter and the decoder receiver board Setting the Address The DS Series encoder and decoder each have ten address lines that must match in order for the transmitter and receiver to talk to each other If they do not match then the decoder ignores the transmission and takes no action To set the address on the receiver evaluation board note the AO AQ labels on the board and turn the DIP switches on or off as desired If a switch Is on the address line is connected to ground If it is off then the address line is pulled high to VCC Figure 4 The Evaluation Board Address DIP Switch The four OEM transmitters have different ways of setting their address lines For your convenience a brief explanation follows however the OEM transmitter manual or Application Note AN O0300 should be referenced for complete details The HHCP and HHLR utilize a ten position DIP switch that is accessed by a cover on the back of the remote The switch numbers match the address lines with switch number 1 corresponding to AO and number 10 to A9 The Keyfob has ten internal cut traces numbered O to 9 to match AO to A9 If the trace is intact it is connect
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