Linx Technologies EVM-915-DTS User Manual

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EVM-915-DTS

Data Guide

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Warning: Linx radio frequency ("RF") products may be used 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. No Linx Technologies product is intended for use in any application without redundancies where the safety of life or property is at risk.

Table of Contents

1 Description 2 Ordering Information 2 Electrical Specications 3 Pin Assignments

The customers and users of devices and machinery controlled with RF products must understand and must use all appropriate safety procedures in connection with the devices, including without limitation, using appropriate safety procedures to prevent inadvertent triggering by the user of the device and using appropriate security codes to prevent triggering of the remote controlled machine or device by users of other remote controllers.

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 data. 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 frequency agility 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.

3 Pin Descriptions 4 PCB Footprint 4 Board Layout Guidelines 5 Schematic Diagram 6 Usage Guidelines for Regulatory Compliance 6 Additional Testing Requirements 7 Module Modication 7 Information to the user 8 Brazil Anatel Labeling Requirements 8 Product Labeling 9 Antenna Selection 10 Interference Considerations 11 Helpful Application Notes From Linx 11 Power Supply Requirements

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.

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EVM-915-DTS RF

Data Guide

Description

The EVM-915-DTS features the DTS Series transceiver module in a FCC modular approved solution. It is designed to greatly simplify implementation of the DTS Series module into a working design without the complications of FCC testing.

Figure 1: EVM-915-DTS Module

The module combines a state-of-the art low power wireless transceiver with a powerful multipoint-to-multipoint protocol controller to form a transparent wireless communication solution capable of replacing wires in almost any RS-232/422/485 application. With a 115dB link budget and very low power operation modes, the DTS Series is excellent for AMR, RFID, home automation, and any other application requiring long range (<1500 feet, 457m line of sight) and long battery life.

Warning: 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.

Features

• U.S FCC and Brazil ANATEL Certiﬁed

• True UART to antenna solution

• 16-bit CRC error checking

• 100kbps max RF data rate

• 32 channels in DTS mode, 84 in

LP mode, North American version

• 19 unique channels in DTS mode, 52 unique channels in LP mode, Brazilian version

Applications

• Direct RS-232/422/485 Wire replacement

• Asset tracking

• Automated meter reading

– –

• Includes PHY and MAC protocol

• Low power Standby and Sleep

modes

• CSMA medium access control

• 115dB link budget in DTS mode

• 4 modes allow user to optimize

power/range

• 5 volt tolerant I/O

• 868–870MHz European version

available

• Industrial and/or home automation

• Wireless sensors

• Remote data logging

Revised 3/18/2015

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Ordering Information

Pin Assignments

Ordering Information

Product Part No. Description Radiotronix Part No.

TRM-915-DTS Evaluation Module,

EVM-915-DTS-FCS

915MHz, Straight RP-SMA Connector,

Wi.232DTS-FCC-ST-R

FCC Approved

TRM-915-DTS Evaluation Module,

EVM-915-DTS-FCR

915MHz, Right Angle RP-SMA

Wi.232DTS-FCC-RA-R

Connector, FCC Approved

TRM-915-DTS Evaluation Module,

EVM-915-DTS-BRZ

915MHz, Right Angle RP-SMA

Wi.232DTSB-EVM-RA-R

Connector, Brazil Anatel Approved

TRM-915-DTS-BRZ Evaluation

EVM-915-DTS-BZS

Module, 915MHz, Straight RP-SMA

Wi.232DTSB-EVM-ST-R

Connector, Brazil Anatel Approved

Figure 2: Ordering Information

Electrical Specications

Electrical Speciﬁcations

Parameter Designation Min. Typ. Max. Units Notes

Power Supply

Operating Voltage V

Supply Current I

Receive 25 mA

Transmit, Po = 0dBm 35 mA

Transmit, Po = 13dBm 60 mA

Digital Interface

Output

Logic Low V

Logic High V

Input

Logic Low V

Logic High V

Environmental

Operating Temperature Range –40 85 °C

Figure 3: Electrical Speciﬁcations

Note: Please see the TRM-915-DTS data guide for complete information

about the module, detailed speciﬁcations and conﬁguration commands.

4 12 VDC

0 0.4 VDC

2.5 V

0 0.3*VCCVDC

0.7*V

VDC

Figure 4: DTS Series EVM Module Pin Assignments (Top View)

Pin Descriptions

Pin Number Name I/O Description

1 VCC — Supply Voltage

2 RXD I

3 TXD O

4 CTS O

5 CMD I

6, 7, 8, 9, 10,

15, 16, 17, 18, 19, 20,

NC —

21, 22

11, 12, 13,

14, 23, 24

GND — Ground

Figure 5: DTS Series EVM Module Pin Descriptions

UART Receive Data Input. This is the input line for the conﬁguration commands as well as data to be sent over the air.

UART Transmit Data Output. This is the output line for the conﬁguration command responses as well as the data received over the air.

UART Clear To Send, active low. This line indicates to the host microcontroller when the module is ready to accept data. When CTS is high, the module is busy. When CTS is low, the module is ready for data.

Command Input. This line sets the serial data as either command data to conﬁgure the module or packet data to be sent over the air. Pull low for command data; pull high for packet data.

No Electrical Connection. Do not connect any traces to these lines.

– – – –

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PCB Footprint

1.50”

(38.10)

Schematic Diagram

VCCVCC

0.208”

0.05”

(1.27)

(5.28)

0.10”

(2.54)

Ø0.04” x 24

(1.02)

0.7”

(1.78)

1.38”

(35.05)

1 24

1.40”

0.05”

(1.27)

(35.56)

Figure 6: DTS Series EVM Module PCB Footprint

Board Layout Guidelines

The module’s design makes integration straightforward; however, it is still critical to exercise care in PCB layout. Failure to observe good layout techniques can result in a signiﬁcant degradation of the module’s performance. Grounding, ﬁltering, decoupling, routing and PCB stack-up are all important considerations for any RF design. Some basic design guidelines are provided here.

The module should, as much as reasonably possible, be isolated from other components on your PCB, especially high-frequency circuitry such as crystal oscillators, switching power supplies, and high-speed bus lines.

When possible, separate RF and digital circuits into different PCB regions.

GND GND GND GND

VCC

15 16 17 18

MOD1

GND GND GND GND

VCC

GND

ANT

GND

RESET

C2D

CTS TXD

RXD

CMD

GND1NC

JP1

12 11 10 9 8 7 6 5 4 3 2 1

NC NC

14 13 12 11 10 9 8 7 6 5 4 3

GND

CTS TXD

RXD CMD

R1 1K

JP2

12 11 10

R2 1K

VCC

GND

9 8 7 6 5 4 3 2 1

CMD CTS

TXD RXD VIN

JP3

1 2 3 4

GND

Make sure internal wiring is routed away from the module and antenna and is secured to prevent displacement.

Bypass caps should be low ESR ceramic types and located directly adjacent to the pin they are serving.

In some instances, a designer may wish to encapsulate or “pot” the product. Since such compounds can considerably impact RF performance and the ability to rework or service the product, it is the responsibility of the designer to evaluate and qualify the impact and suitability of such materials.

– – – –

GND

VIN

GND2GND

3.3V T

GNDGND

Figure 7: DTS Series EVM Module Schematic

OUT

VCC

GND

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Usage Guidelines for Regulatory Compliance

The EVM-915-DTS module is provided with a United States FCC and Brazil ANATEL Modular Certiﬁcation. This certiﬁcation shows that the module meets the requirements of FCC Part 15 and ANATEL Resolution 506 standards for an intentional radiator. The integrator does not need to conduct any further testing under these rules provided that the following guidelines are met:

• An approved antenna must be directly coupled to the module’s RP-SMA connector through an approved coaxial extension cable.

• Alternate antennas can be used, but may require the integrator to perform certiﬁcation testing.

• The module must not be modiﬁed in any way. Coupling of external circuitry must not bypass the provided connectors.

• End product must be externally labeled with “Contains FCC ID: Q7V-3F090003X”.

• The end product’s user’s manual must contain an FCC statement equivalent to that listed on page 7 of this data guide.

• The antenna used for this transceiver must not be co-located or operating in conjunction with any other antenna or transmitter.

• The integrator must not provide any information to the end-user on how to install or remove the module from the end-product.

Note: The integrator is required to perform unintentional radiator testing

on the ﬁnal product per FCC sections 15.107 and 15.109.

Any changes or modiﬁcations not expressly approved by Linx Technologies could void the user’s authority to operate the equipment.

Additional Testing Requirements

The modules have been tested for compliance as an intentional radiator, but the integrator is required to perform unintentional radiator testing on the ﬁnal product per FCC sections 15.107 and 15.109. Additional productspeciﬁc testing might be required. Please contact the FCC regarding regulatory requirements for the application. Ultimately is it the integrator’s responsibility to show that their product complies with the regulations applicable to their product.

Module Modication

The module must not be physically altered in any way. If any connections are made to the modules that bypass the module pins, socket or antenna connector, neither the FCC nor Anatel modular certiﬁcation can be inherited.

Information to the User

The following information must be included in the product’s user manual.

FCC / IC NOTICES

This product contains FCC ID: OJMTRM900TTA

This device complies with Part 15 of the FCC rules. Operation of this device is subject to the following two conditions:

1. This device may not cause harmful interference, and

2. this device must accept any interference received, including interference that may cause undesired operation.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. 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 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 interference 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 following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• 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.

Any modiﬁcations could void the user’s authority to operate the equipment.

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Brazil Anatel Labeling Requirements

The Brazil version, the EVM-915-250-BZx, has been tested and complies with the Anatel regulations for sale in Brazil. The following should be included in the product’s documentation.

Este equipamento opera em caráter secundário, isto é, não tem direito à proteção contra interferência prejudicial, mesmo de estações do mesmo tipo, e não pode causar interferência a sistemas operando em caráter primário.

Antenna Selection

Under FCC and ANATEL regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by the FCC and ANATEL. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.

The EVM-915-250-FCx radio transmitter has been approved by the FCC and the EVM-915-250-BZx has been approved by ANATEL to operate with the antenna types listed in Figure 8 with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.

Antennas

Linx Part Number Type Gain Impedance

ANT-916-CW-QW ¼ Wave Whip 1.84dBi 50Ω

ANT-916-CW-HW ½ Wave Dipole Helical 1.83dBi 50Ω

Figure 8: Antenna Selection

Product Labeling

The end product must be labeled to meet the FCC product label requirements. It must have the below or similar text:

Contains FCC ID: OJMTRM900TTA

The Brazil version must contain:

Anatel: 3069-12-8396

The label must be permanently afﬁxed to the product and readily visible to the user. ‘‘Permanently afﬁxed’’ means that the label is etched, engraved, stamped, silkscreened, indelibly printed, or otherwise permanently marked on a permanently attached part of the equipment or on a nameplate of metal, plastic, or other material fastened to the equipment by welding, riveting, or a permanent adhesive. The label must be designed to last the expected lifetime of the equipment in the environment in which the equipment may be operated and must not be readily detachable.

– – – –

When operating in DTS mode the module may be used with any of the above antennas and maintain the requirements of the FCC grant. When operating the module in LP mode, it must be used with the approved ¼ wave antenna. The module may not be used with the ½ wave dipole antenna in LP mode.

An approved antenna must be directly attached to the module’s reversepolarity SMA connector in the ﬁnal application to inherit the FCC and Anatel modular certiﬁcation.

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Interference Considerations

The RF spectrum is crowded and the potential for conﬂict with unwanted sources of RF is very real. While all RF products are at risk from interference, its effects can be minimized by better understanding its characteristics.

Interference may come from internal or external sources. The ﬁrst step is to eliminate interference from noise sources on the board. This means paying careful attention to layout, grounding, ﬁltering and bypassing in order to eliminate all radiated and conducted interference paths. For many products, this is straightforward; however, products containing components such as switching power supplies, motors, crystals and other potential sources of noise must be approached with care. Comparing your own design with a Linx evaluation board can help to determine if and at what level design-speciﬁc interference is present.

External interference can manifest itself in a variety of ways. Low-level interference produces noise and hashing on the output and reduces the link’s overall range.

Helpful Application Notes from Linx

It is not the intention of 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. These application notes are available online at www.linxtechnologies.com or by contacting Linx.

Helpful Application Note Titles

Note Number Note Title

AN-00100 RF 101: Information for the RF Challenged

AN-00126 Considerations for Operation Within the 902–928MHz Band

AN-00130 Modulation Techniques for Low-Cost RF Data Links

AN-00140 The FCC Road: Part 15 from Concept to Approval

AN-00160 Considerations for Sending Data Over a Wireless Link

AN-00500 Antennas: Design, Application, Performance

AN-00501 Understanding Antenna Speciﬁcations and Operation

High-level interference is caused by nearby products sharing the same frequency or from near-band high-power devices. It can even come from your own products if more than one transmitter is active in the same area. It is important to remember that only one transmitter at a time can occupy a frequency, regardless of the coding of the transmitted signal. This type of interference is less common than those mentioned previously, but in severe cases it can prevent all useful function of the affected device.

Although technically not interference, multipath is also a factor to be understood. Multipath is a term used to refer to the signal cancellation effects that occur when RF waves arrive at the receiver in different phase relationships. This effect is a particularly signiﬁcant factor in interior environments where objects provide many different signal reﬂection paths. Multipath cancellation results in lowered signal levels at the receiver and shorter useful distances for the link.

Figure 9: Helpful Application Notes

Power Supply Requirements

The transceiver incorporates a precision low-dropout regulator which allows operation over a wide input voltage range. Despite this regulator, it is still important to provide a supply

Vcc IN

that is free of noise. Power supply noise can signiﬁcantly affect the module’s performance, so providing a clean power supply for the module should be a high priority during design.

Figure 10: Supply Filter

A 10Ω resistor in series with the supply followed by a 10μF tantalum capacitor from Vcc to ground helps in cases where the quality of supply power is poor (Figure 10). This ﬁlter should be placed close to the module’s supply lines. These values may need to be adjusted depending on the noise present on the supply line.

Vcc TO MODULE

10Ω

10µF

– – – –

1110

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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 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.

The stylized Linx logo, Wireless Made Simple, WiSE, CipherLinx and the stylized CL logo are trademarks of Linx Technologies.