Linx Technologies TR-900-MC Linx RF Transceiver User Manual Owners Manual

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Document Description	Owners Manual
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Date Submitted	2000-10-26 00:00:00
Date Available	2001-01-09 00:00:00
Creation Date	2000-10-09 19:46:03
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Document Title	Owners Manual
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M MULMHANNEL
HIGH-PERFORMANCE
MC-PA SERIES
RF TRANSCEIVER
' ' ' WIRELESS MADE SIMDLE
TECHNHLDEIES
MC-PA SERIES TRANSCEIVER MODULE DESIGN GUIDE
Package Outline
Description
The PA version oi Linx‘s popular MC Series greatly
reduces the time and expense oI making a producl
wireless. This is because the transceiver module is
prerapproved by the FCC when used wrlh the appropriate
proprietary antennas. The Tc-eoo-MoPA transceiver
module is designed tor the nigh-pertormanoe bi-
directional transler oi wireless data. The transceiver
leatures 250 selectable channels and is capable at
transmltlirig serial data at rates up to 150K“ Manual or
serial channel selection modes are available. Utiwng an
advanced synthesized superhet architecture, the module
provides a direct serial data interlace. tully qualified
UARToompatible data output, HSSI, very bw power
consumption, wide operational venue, on-board TX/RX
switch. SAW Iront-end Iilter. and many other uselul
Ieatures. The open serial interiaoe and last turnaround
times eliminate the code balancing, paciwtizing and
latency issues lound in other products. Housed in a
compact through-hole We, me transceiver requires
no tuning or external FtF components lexoepl antennal,
allowing ier straigmtotvtard application.
Features
FCC precertilied It! immedia. ‘ntegration
Precision vcxo synmos'zed architecture
8 Parallel 01 M serially selectable channels
High data-rm: 2,400—150,000bps ~
Trampnmt logic-level serial input .
Meow data output ~
Ouaflied data output .
Shale amna iNO TX/RX swrtch quulredl .
Fm compatible output power and harmonrcs ~
Applications
Small Area Networks
ereless nszazmas Modems
Dilletenlial L0 tor low unintended radiation
TX power programmable with external resistor
Excellent sensitivity l-93dBm typical at tos BERI
SAW lront-end tor superior out-ol-band rejection
HSSI (Received signal strength indicatlonl
Fast start-up and turnaround time
Wlde input-mirage range 12 7 m 12 VDC)
Very low power consumption ias km as 12 mA)
Pmtehdown made
General Data Transler
Compressed Digital Audio/Video
Remote Control W/ Oonlirmallon
Telemetry
Data Collection
Home/Industrial Automation
Long-Range RFID
Robotics
Wire Elimination
ORDERING INFORMATION
PART II DESCRIPTIO '
TC-900-MCrP MC Series Transceiver DIP Pk .
TOQOOVMC-PA MC Series Transceiver DIP Pkg.
FCC Preapproved
MDEV-soo-MC-PA Master Development System
I] Not covered in this manual
Revised ro/wa
PERFORMANCE DATA TC-900-MC-PA NorEs:
ll Into a 50~ohm load
ABOUT THESE MEASUREMENTS 2; Pln 9 ls modulated wiln a av square wave
The penormance parameters listed below are based on module operation at 25°C 3l For ‘0'5 BER at 9-600 baud
lrorn a 5VDC supply unless otherwise noted. 4) Mlnlmum lnpul power level to ensure thal the output wlI| hold a no level
5) These parameters are only characterlzefl and riot tested
6) Measured horn rlsmg edge on IPUN
7) Measured lwm rrsrng edge 0! earner modulallorl on lransrm side to Valld data on recelve me
a; vcc on pm 10 re sv
Dnlgmon m
Frequency Range Fr 902 5 927 5
Fc Toleranee , l l rso
Output Power - Po l Preset lor Part-I 5 Compllance
Harman-c Emvsslons Ph 5 l 43 l
Spurious Emlssmns r eempatlble wrlrl Foo part ls ‘
Frequency Devlatlon so loo
Dela Rate 2,400
Modulation Voltage
Dlgltal o
*CAUTION*
This product incorporates numerous static-sensitive components.
Always wear an ESD wrist strap and observe proper ESD handling
procedures when working with this device. Failure to observe this
precaution may result in module damage or failure.
RECEIVE sermon
LO Frequency SEE TABLE 1
Flo Tolerance 750
Local Oscillator Feedlrlru A50
Spurious Emisslens Ie Wllh FCC part 15 TYPICAL PERFORMANCE GRAPHS
Fleoelve sensnivlty 790 as
Do Modulation Sensltlvrty 436
Data Hale
Data Output Level
HSSI Dc Output Range
HSSI Gain
RSSI Dynamm Flange
ANTENNA PONY
Input Impedance
lrrpul vswn
mm.
Figure 2. RXEN la PLL lock mmng
Tum; ,
Powebon lo Valld Recelve
Powerron Io Valbd Transmll
RX to Valld rx Swllcrllng
rx to Valld RX Swucnrng
Mlnlmum On—Tlme
Par/Eu suww
Operstlng Voltage vcc 1pm lol
Current Consumption Icc
rx Mode
1x Mode
RX Mode
Sleep Moos
' mm mm - «ah-w.
Figum 3 PDN m valid xx dam Flgune 4- Receive Bu Symrrrm @36 mm
guygoumsrmt
Operational Temp
Page 2 Page 3
PIN DESCRIPTION
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Figure 5: MC Series Pmours (Viewed looking down on lap cover)
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LOCK DEVECT
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nx/rx swrrcn
7 Fix/Ix sEtECY w 09am: mm», mm nun in. Rx
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mu m
9 nm lN 2“ w seam mu INPUI
to VIN suPPLWofiA/Eé ziravnc
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lmn mum to mm mm m rang-
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CHANNEL setter a l ussn mu
Bitty mama use! 0 it warm mam
User m Kl we! made
n CNSELI/UGLOOK
cmmst sstscr I miss: CLOCK
Bin-fly channel um I m 9mm moo.
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ENAMEL sztzcr 2
any channel when 2 m Dullhl mm
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MODE sneer
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have Been a. mum war walrfldmodu
Ground tor my sew-m
Page 4
Figuhe ov MC Series Black Dir/gram
DESCRIPTION
The TC»900-MC-PA module is a multi-channel, hall-duplex transceiver designed
tor the transmission of digital data wirelessly at distances of <500 leet outside
and (200 feet inside. No external components (excluding an antenna) are
required, The module incorporates on-board switch allowing the use ol a single
antenna. Linx otters a wide selection of antennas designed for use with the
transceiver module. The PA version has been pre-oerlitied by the FCC which
greatly reduces the time to market and cost of product introduction.
The transceiver is hall-duplex. Theretore, it can only be operated in one mode at
a time: either transmit mode or receive mode. When transmitting, the receiver is
powered down, Likewise, the transmitter is powered down in receive mode.
The TC-900-MC-PA incorporates a precision Low-Dropout Regulator on»board
which allows the module to operate over an input voltage range of 2.7 to 16 volts
DC. An on-board micro-controller reads the channel—selection lines and
programs the PLL to the desired channel frequency. The MC-F'A allows parallel
selection from eight channels. For greater flexibility the MC-PA leatures a serial
mode tor selection lrom 250 channels, In this mode the desired channel is
programmed via a single eight-bit wordThe micro-controller also monitors the
status of the PLL and indicates when the transmitter is stable and ready to
transmit data by raising the Look Detect (LD) line high.
TRANSMITTER OPERATION
_____.—.__—
The transmit section at the transceiver is capable ol producing up to 1mW of
output power while maintaining harmonics and spurious emissions within legal
limits.
The transmitter is comprised ot an L0 and crystal-controlled lrequency
synthesizer. The trequency synthesizer phase locks the L0 to a precision crystal
to achieve a high»Q, low phase-noise oscillator, An accurate 24.00MHz VCXO
(voltagevcontrolled crystal oscillator) serves as the irequency reference lor the
transmitter. The modulated 24.00MHz reterenoe lrequency is applied to the
PhasevLocked Loop (PLL). The PLL, combined with a 902-928MHZ VCO, forms
a stable frequency synthesizer that can be programmed to oscillate at the
desired transmit lrequency.
An on-board micro-controller reads the channelrselection lines and programs the
Page 5
PLL to the desired channel lrequency. The microvcontroller also monitors the
status of the PLL and indicates when the transmitter is stable and ready to
transmit data by raising the Look Detect (LD) line high. The transceivers LD
output is often used as a clearrto-send (CTS) indication so that data transmission
can begin instantly upon PLL lock.
Digital iniormation is modulated at the transmitter using FSK (frequency shilt
keying), the binary form ol lrequency modulation. FSK oilers significant
advantages over AM-based modulation methods, i.e., increased noise immunity
and the ability oi the receiver to "capture" in the presence oi multiple signals.
These advantages Will be particularly appreciated in crowded bands like those in
which the MC-PA operates.
The transmit power amplifier is tixed lor FCC complience and cannot be
adjusted.
The output of the transmitters power amplifier is connected to a Surlace Acoustic
Filter (SAW) which is used to suppress harmonic emissions. All harmonic
specilications are based on a 50-ohm load. The module incorporates an on-
board switch allowing the use ol a single antenna. Linx otters a wide selection ol
antennas designed lor use with the transceiver module. It is important to note
that the module must be used with the correct, preapproved antenna in order to
maintain its pre~certitied status.
RECEIVER OPERATION
—_____———_—
The receive section ol the transceiver is a single conversion superhet
configuration. with an IF ol 10.7 MHz. The receiver combines outstanding
sensitivity and remarkably low power consumption.
The incoming RF signal is filtered by Surface Acoustic Filter (SAW) which is used
to attenuate unwanted out oi band energy. A SAW tilter provides signilicantly
steeper roll-oil and higher out—ol-band attenuation than many other iilter types.
Once filtered, the signal is amplified by a Low-Noise Amplifier (LNA) which
increases the receiver sensitivity and results in a low overall noise figure. After
the LNA the signal is introduced to a mixer where it is combined with a high-side
local oscillator lrequency generated by the synthesized 24.00MHz VCXO
(voltage-controlled crystal oscillator) which serves as the lreduency relerenoe lor
the transmitter.
After the mixer, the 10.7 MHz by—product is passed through additional liltering
and gain stages. A quadrature demodulator is used to recover the baseband
signal lrorn the carrier. Alter demodulation the low-level baseband signal is
iiltered, then fed to a proprietary highvpertormance data slicer. The data slioer is
capable ol recreating squared wavelorms within a 1200Hz to 75kHz analog
bandwidth, giving a data-rate bandwidth ol 2400bos to 150kBps. The slicer
assures last and square edge transitions and restores much of the symmetry oi
the original data. In addition, the slicer restores the data to its original phase and
quaiilies the data output by comparison of the RSSI level with a lactoryvpreset
squelch threshold. When the transmitter is on but not being modulated, or when
the received signal strength is too low to ensure proper demodulation, the data
output is squelched to a continuous high state. This ensures compatibility with
Page 6
common serial UAFtT‘s which expect to see a high-to-low transition as a start
sequence. The linal data output is a remarkably aocurate recreation oi the
original data suitable lor direct interface with a wide variety of external devices.
TlMING CONSIDERATIONS
There are several important timing parameters listed under the “Performance
Specnications“ section of this document. It is important to consider when
designing Start—Up time and RX-to-TX time. The value lor each is Please make
sure that you have a current data sheet prior to designing with the Transceiver.
The TX start-up time is measured as the time lrom the /PDN pin going high to
the transmitter being ready to transmit data.
The FlX starteup time is measured as the time lrom the /PDN pin going high to
the receiver's data output being valid.
The RX-to—TX time is measured as the time from the RX/TX select line going
high to the transmitter being ready to transmit data,
The TX-to-FlX time is measured as the time lrom the RXITX select line going low
to the receiver‘s data output being valid.
Palmer Desorlptlon Min. Max.
TI TX initial startup time 5 mSec
T2 Max time between 33 mSec
data output transitions
T3 TX Channel 10 mSec
Change Time (Time to
Valid Data)
TX to FiX time
T4 FiX initial startup time 12 mSec
FtX Settling time
TX Channel Change Time 10 mSec
(Time to Valid Data)
FtX to TX time
T5 Min. OflTime 1 mSec
Page 7
POWER CONSIDERATIONS
The transceiver has an on-board voltage
regulator that regulates the internal VCC to
3.0V. This allows a wide operating voltage range
ol 2.7V to 16V. At 2.7V, the internal regulator
acts as a saturated switch, directly passing
voltage through to the internal electronics The
lPDN pin can be used to put the transceiver into
a low-current sleep mode (<50uA).
The user must proVide a clean source of power Flgl/VY 7: Sugges/ed nipply filler
to the receiver to ensure proper operation. In an
FM receiver. power-supply noise will manifest itself as AM and FM noise in the
receiver circuitry, reducing the overall sensitivity of the receiver. Providing a good
power supply for the module is a designer‘s first line of defense in the battle for
receiver sensitivity. The module's power-supply line should have bypass
capacitors configured, as shown in figure 7, in near proximity to the module The
designer should check the incoming supply for system noise as additional
liltering may be required.
CHANNEL SELECTION
The MC—PA has an on-board microcontroller which serves to greatly simplify the
channel-selection process by eliminating the traditionally complex ritual of
calculating and programming the synthesizer‘s many counter and control
registers. Instead, the MC-PA allows channel selection in the two convenient
formats described below. 'IMPORTANT NOTE: The mode selected at power-up
remains in effect regardless of changes in the mode status line. If both parallel
and serial modes are to be alternately used in the same device. supply must be
cycled in order for the mode change to be recognized.
Parallel Mode
When the mode select line is grounded at power-up the transceiver will allow
parallel selection of eight channels. The Mode line may be permanently wired
high or controlled by external logic if both Parallel and Serial channel selection
modes are to be used.The channel of operation is determined by the state of pins
CSO-CSZ. Figure 17 shows a channel—selection table based on the pins' states.
This mode allows for manual channel selection Via switches in product designs
where a microprocessor is not used. The eight channels selected in this mode
correspond with the frequencies of Linx‘ popular HP—series for use in mixed
module environments.
Serial Mode
The serial selection mode is entered by assuring that the Mode line is high at
transceiver power-up. In this mode 080 becomes a user data line and 081
becomes a user clock line. Together these two lines form a simple synchronous
interface which allows the direct selection of 250 channels via an external
microprocessor. A synchronous data transfer protocol was chosen because of its
ease of interface and flexibility. The synchronous method chosen by Linx is
unique but quite similar to the IZC standard. Two pins (CLOCK and DATA) are
Page a
controlled externally to transfer a Single eight-bit word containing the desired
channel number. Each bit is delimited for transfer by a pulse on a separate clock
line. Because each data bit is associated with a clock bit the module will, within
the specified limits, correctly recognize a bit regardless of the clock rate or
asymmetry. User information can be transferred from near DC to very high data
rates and the rate can vary across those limits throughout the data transfer
process.
Channel selection is accomplished by a frame sequence followed by an eight—bit
number from 0250 representing the desired channel as shown in the adjoining
diagrams.
In order to delimit the data and assure the most robust interface, a packet must
be started with a framing sequence in order to be considered valid.
Both the data and clock pins are internally pulled high on the module. The
framing sequence consists simply of externally pulling both the clock and data
pins low then returning the clock line high. This prepares the module to accept
an eight-bit word synchronously, LSB first. Data bits are transferred by taking
the DATA pin high or low to represent the bit being sent and then pulling the
CLOCK line low. Data is transierred on the FALLING edge. The CLOCK line is
then restored high to prepare for the next bit's transfer. When eight bits have been
received by the modules on-board processor the data is automatically latched
and read. The auto-latch feature is designed to minimize the number of external
I/O lines and programming requirements. Application note #155 (Serial Loading
Techniques for the MC- Series) provides further details of interface and includes
sample code for the popular PIC microcontroller.
It is important to note that the module has several modes designed to handle
loading errors and assist the designer in troubleshooting. When an error such as
an absent or improper load occurs, the module will automatically go to a preset
frequency. By using a spectrum analyzer on any HP series receiver module the
error type can be identified. It is important to note that the module will always be
active on some frequency anytime it is powered on whether loaded externally or
not. This is to allow troubleshooting and insure FCC compliance.
If you are unfamiliar with utilizing a microprocessor for synchronous data transfer,
you may wish to review the following software which demonstrates a simple
synchronous serial transfer routine for the popular Microchip PIC processor.
Page 9
BOARD LAYOUT CONSIDERATIONS
If you are at all familiar with RF devices, you may be concerned about
specialized layout requirements. Fortunately, because of the care taken by
Linx in the internal design of the module, integration into your design is very
straightforward By adhering carefully to a few basic design and layout rules,
you can enjoy a trouble—free path to RF success,
r; 1.3 " —.’
0.100" Typ.
_i_
he
oaoaaoaaaa
50 mil pad WM 030"
Ground-plane on Lower Layer
Figure 8‘ Recommended PCB layout
Figure 8 shows the suggested F'CB footprint for the MC-PA Series transceiver.
The module should, as much as reasonably possible. be isolated from other
components on your PCB. Specifically, high~frequency circuitry such as crystal
oscillators should be kept as far away as possible from the module, Avoid running
noise bearing traces under the module or in the vicinity of the antenna.
A groundplane (as large as possible) should be placed under the Transceiver.
This groundplane can also be critical to the performance of your antenna. In most
cases the module will be used with a 1/4-wave antenna, The groundplane serves
as the antennas counterpoise, forming, in essence, a half-wave dipole.
Since the MC-PA is designed to utilize antennas which attach directly, the
orientation of the module on the product's PCB is important. Several possible
orientations are shown below.
The optimum orientation for the
antenna would be centered on
the edge of the groundplane,
shown in figure 9—A.
Position shown in figure 9-B is
NOT recommended.
Figure «1: GIOI/Ildfrllme (men/11mm
Page it)
ANTENNA CONSIDERATIONS
The MC-PA series transceivers feature a unique
RP-SMA antenna connector. This connector is ”52123 ”
designed to allow the convenience and Ilexi “lity of m '
a detachable antenna while maintaining
compliance with FCC guidelines.
Linx and other manufacturers sell a variety of
antenna styles and connectors designed to mate 5,533,152;
with the module's RP-SMA connection. It is «.
important to note, however, that the module must
be used with the appropriate Linx antennas in order Clarroslnlck
to retain its preaapproved status. Other antennas mdedcase
may be used; however, recertitication would be
necessary prior to offering the product for sale.
The antennas pictured below illustrate styles that
would be commonly employed. Please contact Lrnx
. . . . Fl n
or vrslt www.t|nxtechnolog|es.com for the most We feel:
current information on compliant antenna styles.
PiastidMetal
Figure IO: Compatible Linx Antenna Slyles
A SYSTEM’S DESIGN APPROACH
To properly apply the transceiver, the designer must take a “systems“ view of the
communications link.
In this communication system, there are a transmitter, an antenna, free space,
an antenna, and a receiver. At every point in this system, there are timing and
data corruption issues that must be fully understood and accounted for.
It is important to note that the TC»9007MC-PA does not encode or packetize the
data in any manner. This transparency eliminates the issues of variable latency
common to traditional radio modems and gives the designer tremendous
flexibility in the structure of protocol. A drawback to this approach is that the
performance and reliability of the link is in part determined by the quality of
external software and hardware. It is critical that all project engineers have a full
understanding and respect for the differences that exist between a wired and a
wireless environment. The lollowrng section briefly outlines the typical flow of
Page ti
events in a link incorporating MC series modules. There are many alternative
methodologies but it is intended to illustrate some oi the considerations
previously mentioned.
The MC series is a halt-duplex transceiver. This means that the transceiver itselt
can only act as a transmitter or a receiver at any given time, but never both. When
designing with a halt-duplex transceiver it is important to allow for the timing
requirements when shitting between transmit and receive modes. ln a typical
system, the operation will be as tollows:
1) Switch to transmit mode
The transceiver is placed in transmit mode by bringing Fix/TX tine high or leaving
it lloating. The PDN pin must be open or pulled to VCC. Once the transceiver is
placed in transmit mode, it will start the VCXO (voltage controlled crystal
oscillator) and begin trying to phase-look the main carrier to the VCXO.
2) Wait tor transmltter to stabilize
This step is necessary to allow the transmitter time to stabilize. Lock will be
indicated by the lock detect (LD) pin after which time the transmitter is ready to
begin sending data. it the LD pin is not utilized the designer must allow the
maximum lock time listed elsewhere in this document.
3) Transmit a packet
Packets should be transmitted so that there is no space between bytes. The
tollowing packet format should be followed:
[ uart sync byte] [start byte] [packet data]
The UAFtT sync byte is used to ensure that the startrbit tor the start byte will be
accurately detected. It is a single byte with a value of OFF hex.
The start byte indicates the beginning of the packet. The detection of the start
byte would be perlormed by the computer or microcontroller connected to the
transceiver.
4) Switch to receive mode
The transceiver is placed in receive mode by pulling the Fix/TX line low. The PDN
pin must be open or pulled to VCC. Once the transceiver is placed in receive
mode. it will start the crystal oscillator and begin trying to phase-lock the L0 to
the crystal.
5) Walt tor receiver to stabilize
This step is necessary to allow the receiver time to stabilize. When the L0 is
phase-locked and the data slicer stable, the transceiver is ready to receive valid
data.
6) Receive a packet
The pre-amble serves to set up the data slicer. but can confuse the UART. The
UART interprets the start-bit of a byte as a 1-0 transition. When the incoming
data is 101010 is hard to know which 1-0 transition actually marks the start
bit. This problem is solved by the UART Sync Byte. It will cause the bit pattern to
look like this:
...010101 0111111111. The space indicates the beginning of the UART Sync
byte. ll the UAFtT were to interpret the last 1-0 transition as a start-bit, it would
receive the tollowing byte: 101111t111.The remaining 1's would be ignored and
the startabit oi the start byte would be correctly recognized.
Page 12
The start byte is used by the receiving computer or microcontroller to detect the
beginning 01 a valid packet. In reality, there may actually be two start bytes. In any
case, the start byte should be chosen so that it does not appear in the data
stream. Otherwise, a receiver may make up" in the middle ol a padret and
interpret data in the packet as a valid start byte. There are other. more
complicated ways to organize the protocol it this restriction cannot be met.
There is a possibility ol bursting errors corrupting the data packet. so we
recommend that some lorm oi error checking be embedded in the data packet.
A simple chedrsum or ORG could be used.
When used tor halt-duplex communications, the microcontroller wtll basically run
through the steps in order and then return back to step t, flipping back and forth
between transmit and receive modes. In this case, the designer must take into
account the timing considerations 01 both the transmitting and receiving sides.
The preceding flow description is very simplistic and is intended tor illustration
purposes only. The systems designer should carelully think through protocol
issues to ensure reliability under tield conditions.
Page 13
LEGAL CONSIDERATIONS
The TC-900-MCvPA module has been previously tested and received
certification as a modular product from the FCC. No further testing of the module
is necessary when compliant antennas are employed. The pre-certilied status of
the module is valid only if all of the following are observed:
. No modifications to the module may be made.
- The module must utilize Linx antennas which have been previously tested
with the module and approved for FCC compliance
. The pro-certified status applies only to the RF module The user must
NOTE: MC-I’A Series Modules are pie-approval by the FCC for
operation within the United States: however, they are not approved by other
agencies worldwidt. Th: purchaser should understands that additional
nppmvals may be rzquiud prior to the sale or operation oftlie device, and
agrees to utilize the component in kezping with all applicable laws in [he
caunrry of opzran'an.
Questions regarding domestic rules should be addressed to:
Federal Communications Commtsston
Equipment Authorization Division
Customer Service Branch. MS |300F2
7435 Oakland Mills Road
determine if additional certification or testing is required lor peripheral circuitry. C°'Ut“b13< MD 2‘0‘5
. , . _ _ _ , Tel: t30|)725-|585/Fax: (sonata-2050 E—Mail Iabinlo@tcc gov
. If the transceiver's own label is not Visible when installed inside another
device then the device must display an external label referring to the enclosed
module. The exterior label should appear as lollows:
dimers: ACHIEVING A SUCCESSFUL RF IMPLEMENTATION
FIF Transceiver module
FCC ID:OJM-TC-900~MC
Adding wireless capabilities brings an exciting new dimension to any product. By
utilizing Linx pre-certitied RF modules the cost, effort. and time necessary to
bring your product to market will be greatly reduced. By choosing Linx as your
FtF partner and taking advantage of the resources we offer, you will not only
survive implementing RF. but you may even find the process enjoyable.
The product's instruction manual must display the following statement:
INSTRUCTION TO THE USER
This equipment contains an RF module which has been previously tested and
found to comply with the limits for a Class B digital device. pursuant to Part 15
ol the FCC Flules, These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and if not installed and
HELPFUL APPLICATION NOTES FROM LINX
used in accordance with the instructions, may cause harmful interference to
radio communications. However. there is no guarantee that interference will not ‘
occur in a particular installation, If this equipment does cause harmful
interterenoe to radio or television reception, which can be determined by turning
the equipment off and on. the user is encouraged to try to correct the
‘ interference by one or more of the followmg measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiverc
Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
‘ Consult the dealer or an experienced radio/TV technician for help.
This equipment has been certified to comply with the limits lot a Class B ‘
computing device. pursuant to FCC Rules. in order to maintain compliance with
FCC regulations, shielded cables must be used with this equipment Operation
with non-approved equipment or unshielded cables is likely to result in
interference to radio and TV reception. The user is cautioned that changes and
modifications made to the equipment without the approval of manufacturer
could void the user's authority to operate this equipment.
l —
NOTE it
~ =No| available at the time of this priming
lt is not the intention oi this manual to address in depth many of the issues that
should be considered to ensure that the modules function correctly and deliver
the maximum possible performance, As you proceed with your design you may
wish to obtain one or more of the following application notes. which address in
depth key areas of RF design and application of Linx products.
LINX APPLICATION NOTE TITLE
Antennas: Design, Application, Performance
Modulih‘on techniques for law-cost RF data links
Considercficns for operation in the 902 MIIZ to 928 Mhz band
RF 101: Information for the RF challenged
The FCC Road: Part 15 from concept to approval
100
Use and design ofTvAtteniiafion Pads
RS-232 A brill overview
Consideration: for audit; data with the SC Serlu‘
Page 15
INK
”EHNDLUEIES
Ill—
U.S. CORPORATE HEADQUARTERS:
LINX TECHNOLOGIES, INC.
575 S.E. ASHLEY PLACE
GRANTS PASS. OR 97526
Phone: (541) 471-6256
FAX: (541) 471-6251
http://www.|inxtechnologies.com
Disclaimer
Linx Technologies is continually striving to improve the qualily and lunction oi its producls; lor
lhis reason, we reserve the right to make changes without nolioe. The inlormation contained in
this Data Sheel is believed to be accurale as ol the lime or publication. Specifications are based
on representative iol samples. Values may vary irom lotto lot and are not guaranleed. Linx
Technologies makes no guarantee, warranty, or representation regarding the suilability oi any
product lor use in a specific application None oi these dew/ices is intended tor use in
applications oi a critical nature where the salety oi lite or property is at risk. The user assumes
iulI liability lorthe use oi product in such applications, Under no oondilions will Linx Technologies
be responsibie lor losses arising lrom lhe use or lailure oi the device in any application, other
than the repair. replacement, or relund limited to the original product purchase price. Some
devices described in this publication are palented. Under no circumstances shall any user be
conveyed any license or right to the use orawnersnip ol these patents
«12000 by LinthcbnoI es Inc rhtslyliud
Llnx logo. in“ and" less mad:
are Ill! lrxdeiimrks dl Lm Technologist Iiic
Primed m ll 5 A
Page 16

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