EVAL-315-LR [ETC]
LR SERIES BASIC EVALUATION KIT USERâS GUIDE;
| 型号： | EVAL-315-LR |
| 厂家： | 
ETC |
| 描述： | LR SERIES BASIC EVALUATION KIT USERâS GUIDE |
| 文件： | 总5页 (文件大小：298K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVAL-315-LR
EVAL-418-LR
EVAL-433-LR
WIRELESS MADE SIMPLE ®
LR SERIES BASIC EVALUATION KIT USER’S GUIDE
ORDERING INFORMATION
PART #
DESCRIPTION
EVAL-***-LR
LR Series Basic Evaluation Kit
*** = 315, 418 (Standard), 433MHz
INTRODUCTION
Linx LR Series RF modules offer a simple, efficient, and cost-effective method of
adding wireless communication capabilities to any product. The Basic Evaluation Kit
is intended to give a designer all the tools necessary to correctly and legally
incorporate the LR Series modules into an end product. The development boards
themselves serve several important functions:
• Rapid Module Evaluation - The boards allow the performance of the Linx LR
Series modules to be evaluated quickly in a user’s environment.
• Range Testing - Using the on-board encoders and decoders to generate a
simplex transmission, a pair of development boards can be used to evaluate the
range performance of the modules.
• Design Benchmark - During the design process of your product, the boards
provide a known benchmark against which the performance of your own design
can be judged.
• Application Development - An on-board prototyping area is provided to allow a
designer to develop applications directly on the development board. All signal
lines are available on a breakout header for easy connection to the designer’s
circuits.
The purpose of this guide is to show the designer how to take full advantage of the
basic development boards included with the kit.
The kit includes 2 LR Series transmitters*, 2 LR Series receivers*, 2 extra PCB-mount
RP-SMA connectors, 2 development boards, 2 CW Series antennas, 1 CR2032
battery, 2 AAA batteries, and full documentation.
*One part is soldered to the board, one extra for use on your first prototype board.
Revised 6/14/10
LR TRANSMITTER EVALUATION BOARD
THEORY OF OPERATION
TRANSMITTER EVALUATION BOARD
The transmitter board is powered by an on-board 3V CR2032 lithium battery. It
has two SPST pushbutton switches, the state of which is encoded into a data
stream using a Linx MS Series encoder. If a switch is closed, the transmitter will
be enabled while the encoder captures the pushbutton states for encoding and
transmission. The encoder will power down the transmitter when the button is
released. Only the two switches that control the LED and buzzer on the receiver
board have been populated, but if it is desired to use all eight data lines, then the
Omron B3S-1002 or equivalent switches can be used. All of the data lines have
been wired out to the header to the right of the prototyping area and can be
accessed for use with other switches, contacts, or microcontrollers.
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RECEIVER EVALUATION BOARD
The receiver board is powered by two AAA batteries. The LR Series receiver
exhibits a sensitivity of greater than -112dBm, so under optimum line-of-sight
conditions, the transmitter / receiver link can operate over distances of up to
3,000 feet. The data recovered by the LR Series receiver is decoded by a MS
Series decoder, and the data lines are updated to match the state of the data
lines (or pushbuttons) on the transmitter board. To demonstrate this, one data
line is used to drive a LED while another is used to activate a buzzer. This board
also has a prototyping area with all of the receiver and decoder lines brought out
to a header.
1. Battery - 3VDC (use a CR2032-style battery only)
2. Power Switch
3. Continuous ON Switches
4. Momentary Pushbuttons - S0 (D0), S1 (D1)
5. Prototyping Area
6. Breakout Header
7. Reverse-Polarity SMA Antenna Connector
8. LR Series Transmitter Module
9. MS Series Encoder
USING THE KIT
Using the kit is straightforward. Simply attach the antennas, turn on the power,
and press one or both of the buttons on the transmitter board. When S0 is
pressed, the buzzer will sound; when S1 is pressed, the LED will turn on.
LR RECEIVER EVALUATION BOARD
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DEVELOPMENT USING THE PROTOTYPING AREA
In addition to their evaluation functions, the boards may also be used for actual
product development. They feature a prototyping area to facilitate the addition of
application-specific circuitry. This area has a connection to VCC at the top and
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ground at the bottom that can be used to power the added circuitry.
NOTE: The CR2032-style battery on the transmitter board has very low current capacity
with, only about 3mA available for external circuitry. If added circuitry requires a higher
current, the battery must be removed and the board powered from an external source.
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The holes are plated and set at 0.100” on center with a 0.040” diameter, making
it easy to add most industry-standard SIP and DIP packages to the board.
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On the transmitter board, the data lines from the encoder and the PDN line from
the transmitter have been wired out to a row of plated holes on the right side of
the prototyping area. On the receiver board, the data lines from the decoder plus
the RSSI, PDN, and DATA lines from the receiver have been wired out. This
allows for easy access to connect external circuitry to the modules, the encoder,
and the decoder. Data line D0 is connected to the buzzer and D1 is connected
to the LED.
1. Batteries - 3VDC (use 2 AAA style batteries only)
2. Power Switch
3. Prototyping Area
4. Breakout Header
5. LR Series Receiver Module
6. MS Series Decoder
7. Reverse-Polarity SMA Antenna Connector
8. LED - D1
9. Buzzer - D0
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RANGE TESTING
USING THE BOARDS AS A DESIGN REFERENCE
Several 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 intended
operational environment.
The basic evaluation boards included in this kit are very simple, yet they illustrate
some important techniques that you may wish to incorporate into your own board
layout. You will observe that the LR 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. Next, observe the use of a full ground
plane fill on the lower side of the board. This ground plane serves three important
purposes:
Simple range testing can be performed with the transmitter and receiver
evaluation boards. To prepare the board for range testing, simply turn it on by
switching the power switch to the ON position. Pressing S0 on the transmitter will
activate the buzzer on the receiver board, while S1 activates the LED. Switches
SW0 and SW1 have been provided to jumper the buttons and continuously
transmit. This will allow the designer to turn on the transmitter and walk with the
receiver.
First, since a 1/4-wave antenna is employed, the ground plane is critical to serve
as a counterpoise (you may wish to read Application Note AN-00500 Antennas:
Design, Application, and Performance for additional details on how a ground
plane affects antenna function).
Second, a ground plane will suppress the transfer of noise between stages of a
product, as well as unintentional radiation of noise into free space.
As you near the maximum range of the link in your area, it is not uncommon for
the signal to cut in and out as you move. This is normal and can result from other
interfering sources or fluctuating signal levels due to multipath effects. This
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 farther will usually
restore the signal.
Third, a ground plane allows for the implementation of a microstrip feed to 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 between the module and
the antenna. A microstrip is implemented on this evaluation board. If you are
unfamiliar with microstrip calculations, you may wish to refer to the LR Series
data guides or the calculator available on our website.
IN CLOSING
Since the evaluation boards are intended for use by design engineers, they are
not FCC certified. The transmitter has been set to approximate legal limits by
resistor R9 so that the range test results will approximate the results from a well-
designed, certified product. For applications where Part 15 limits are not
applicable or output levels can be legally raised due to protocol duty cycle, R9
can be changed according to the graph on Page 3 of the LR Series Transmitter
Data Guide.
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 541-471-6256 between 9AM and 4PM Pacific
Time to speak with an application engineer.
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 specified by Linx for the products you are testing, then
there is likely a problem with either the board or the ambient RF environment in
which the board is operating. First, check the battery, switch positions, 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.
Legal Notice
All Linx kits and modules are designed in keeping with high engineering standards;
however, it is the responsibility of the user to ensure that the products are operated in a
legal and appropriate manner. The purchaser understands that legal operation may require
additional permits, approvals, or certifications prior to use, depending on the country of
operation.
ONLINE RESOURCES
If you have questions regarding any Linx product and have Internet access,
make www.linxtechnologies.com your first stop. Our website is organized in an
intuitive format to give you the answers you need. Day or night, the Linx website
gives you instant access to the latest information regarding the products and
services of Linx. It’s all here: manual and software updates, application notes, a
comprehensive knowledgebase, FCC information, and much more. Be sure to
visit often!
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 you may wish to consider for your design. Included with your kit is a
Linx CW Series connectorized whip antenna that should be connected prior to
using the kit. Despite the fact that the antenna is not centered on the board’s
ground plane, it exhibits a VSWR of <1.7 and suitably demonstrates the
module’s best practical performance.
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EVAL-***-LR Receiver Board Schematic
EVAL-***-LR Transmitter Board Schematic
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WIRELESS MADE SIMPLE ®
U.S. CORPORATE HEADQUARTERS
LINX TECHNOLOGIES, INC.
159 ORT LANE
MERLIN, OR 97532
PHONE: (541) 471-6256
FAX: (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 of 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 application, 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.
© 2010 by Linx Technologies, Inc. The stylized Linx logo,
Linx, “Wireless Made Simple”, CipherLinx, and the stylized
CL logo are the trademarks of Linx Technologies, Inc.
Printed in U.S.A.
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