IFM Electronic Efector 190 DTE820 Bedienungsanleitung

Operating instructions

RFID UHF Sensor

Mid Range

DTE820

706386 / 00 12 / 2014

RFID UHF Sensor

Content

1 Preliminary note � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3

1�1 Symbols used� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3

2 Safety instructions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3

2�1 General� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3

2�2 Target group � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3

2�3 Electrical connection � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4

2�4 Tampering with the device � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4

2�5 Ventilation� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4

2�6 Environmental conditions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4

2�7 Radiated electromagnetic field strengths � � � � � � � � � � � � � � � � � � � � � � � � � � 4

3 Functions and features � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5

4 Items supplied� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5

5 Accessories� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5

6 Characteristics of the antenna � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6

6�1 Reading range and tag shape � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6

7 Reading range and selectivity� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7

8 Conformity with standards � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8

9 Installation� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10

9�1 Installation location� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10

9�2 Laying of cables � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �11

9�3 Drilling template � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �11

9�4 Connections and status indication � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 12

9�5 GPIO and RS-232 connection � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 13

9�6 Ethernet and current supply connection� � � � � � � � � � � � � � � � � � � � � � � � � � 14

10 Typical applications� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 15

10�1 Access systems � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 15

10�2 Automation industry � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 15

10�3 Further applications � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 15

11 Abbreviations � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 16

12 Maintenance, repair and disposal� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 16

RFID UHF Sensor

1 Preliminary note

This document is intended for specialists� These specialists are people who are

qualified by their appropriate training and their experience to see risks and to

avoid possible hazards that may be caused during operation or maintenance of

the device� The document contains information about the correct handling of the

device�

Read this document before use to familiarise yourself with operating conditions,

installation and operation� Keep this document during the entire duration of use of

the device�

1.1 Symbols used

►Instructions

> Reaction, result

[…] Designation of keys, buttons or indications

→Cross-reference

Important note

Non-compliance may result in malfunction or interference�

Information

Supplementary note

2 Safety instructions

2.1 General

These instructions are an integral part of the device� They contain texts and figures

concerning the correct handling of the device and must be read before installation

or use�

Observe the operating instructions� Non-observance of the instructions, operation

which is not in accordance with use as prescribed below, wrong installation or

incorrect handling can seriously affect the safety of operators and machinery�

2.2 Target group

These instructions are intended for authorised persons according to the EMC and

low-voltage directives� The device must only be installed, connected and put into

operation by a qualified electrician�

RFID UHF Sensor

2.3 Electrical connection

Disconnect the device externally before handling it�

The device can be damaged when the operating voltage is switched on and no

LAN cable is connected� Connect a LAN cable to the device before you switch on

the operating voltage�

The connection pins may only be supplied with the signals indicated in the

technical data and/or on the device label and only the approved accessories of ifm

may be connected�

2.4 Tampering with the device

In case of malfunctions or uncertainties please contact the manufacturer� Any

tampering with the device can seriously affect the safety of operators and

machinery� This is not permitted and leads to the exclusion of any liability and

warranty claims�

2.5 Ventilation

During operation the device must be sufficiently ventilated� Install the device only

in places where ventilation is ensured�

With insufficient ventilation there is a risk of fire�

2.6 Environmental conditions

Do not place the device in the vicinity of heaters, do not expose it to direct sunlight

and do not operate it in wet environments� No objects with open flames must be

placed onto the device� Protect the device against moisture, falling water drops and

splashing water� Observe the environmental conditions indicated in the technical

data sheet�

There is a risk of fire in unsuitable environmental conditions�

2.7 Radiated electromagnetic field strengths

The device complies with the requirements to CE�

Brand name: ifm electronic DTE820 RFID-UHF sensor for Europe

The DTE820 is designed for operation in accordance with EN 302208� During

operation the human exposure regulations to EN50364 have to be observed�

Ensure a minimum distance of 23 cm between antenna and human bodies�

During operation cardiac pacemakers of people in the vicinity may be impaired�

In case of doubt, persons concerned should consult the manufacturer of the

pacemaker or their doctor�

Reduce the output power of your device depending on the antenna cable

length and the antenna gain�

RFID UHF Sensor

3 Functions and features

The DTE820 RFID UHF sensor integrates a mid-range RFID UHF antenna and an

RFID UHF reader to process the antenna signals� The device is suited for reading

and writing active and passive RFID tags in the frequency range of 865 - 868 MHz�

The DTE820 has a PoE Ethernet interface and a serial interface� In addition digital

inputs and outputs (GPIO) are available� The device can be supplied with voltage

either via PoE or locally�

On delivery the device can read and write tags according to the EPC Gen2

standard� Other protocols can be uploaded via software updates�

Knowledge of the EPCglobal GS1 standard is necessary for the configuration of

the DTE820� In this standard the function of the interface between tag and reader

is described� Further information at: www�epcglobalinc�org�

The DTE820 can be controlled and evaluated in various ways:

●Software ReaderStart

●Supplied DLL

●Access to the reader protocol

4 Items supplied

●DTE820 RFID UHF sensor

●CD with demo software, example programming, DLL and documentation

5 Accessories

The following accessories are available for the DTE820: If you have any questions

about the accessories, please contact our sales team�

●Connection cable for Ethernet and current connection (PoE), article no� E11898

●Mast and wall fixture, article no� E80340 for mounting RFID antennas,

DTE readers and sensors (up to a total weight of 6�0 kg)�

●Connection cable for GPIO and RS-232 connection, 12 poles,

article no� for 1�5 m ZB0643, article no� for 5�0 m: ZB0656�

RFID UHF Sensor

6 Characteristics of the antenna

The RFID UHF antenna integrated in the DTE820 is a mid-range antenna which

meets the requirements of many RFID applications�

Mid-range antennas have been developed for applications in the near and far

field� Special attention was paid to a small design for integration in compact

environments� For dimensions of 156 x 126 reading ranges of more than 2 m are

nevertheless possible� Mid-range antennas also have an increased selectivity at

lower read distances as compared to conventional antennas� That means that they

are suitable for the transition range with various tags�

6.1 Reading range and tag shape

Reading range Tag shape

loop-shaped hybrid-type dipole-type

10-30 cm

30 - 100 cm

> 100 cm

The correct combination of antenna and tag is essential for every RFID

application� This ensures a high reading rate and reliable system operation�

0 2 m

4 m 2 m 4 m

DTE820 100° 30 ERP

2 m

1 m

Figure: DTE820 reading range

RFID UHF Sensor

7 Reading range and selectivity

The reading range and the selectivity are the most important features of an RFID

application� The reading range describes the greatest distance at which a tag

can be read� The selectivity indicates the required minimum distance for clear

distinction between two adjacent tags�

The system features depend considerably on the tag type used�

In general, the UHF RFID tags can be divided into three groups:

The first group consists of small, loop-shaped tags (near field tags) with an

average diameter of 2 cm that mostly couple with the antenna magnetically� These

tags have the smallest ranges since the magnetic field decreases rapidly with the

distance of the antenna�

The second group consists of hybrid-type tags which are a mix of loop-shaped

and dipole-type tags� These tags can be activated by the antenna via the magnetic

field, the electric field or a combination of both�

The third group is made up of dipole-type tags (far field tags) which mostly couple

via the electric field� Ranges of more than 10 m are possible�

Figure: RFID UHF sensor detects tag at short

distance

Figure: Illustration of reading range and selectivity

Selectivity

Reading range

RFID UHF Sensor

8 Conformity with standards

Since the RFID systems are radio systems, they are in the scope of the 1999/5/EC

guideline of the European Commission (Radio and Telecommunications Terminal

Equipment R&TTE)�

As evidence of the conformity with the basic requirements of this guideline there is

a number of harmonised standards that are published in the Official Journal of the

European Union�

The ifm antennas have a passive antenna structure� The system integrator is

responsible for meeting the standards� Therefore it is expressly recommended to

acquire these standards�

Two important standards in connection with antennas are (not exhaustive)

EN 302208 and EN 50364: The first one deals with radio spectrum matters and

limits the maximally radiated power while

EN 50364 deals with the limitation of human exposure to electromagnetic fields�

As evidence of the antenna conformity with the standard EN 50364 the specific

absorption rate (SAR) is calculated numerically� The determined SAR values are

compared with the basic limit values of EN 50364 - classified to occupational

exposure, exposure of the general public and local exposure of head and

trunk and limbs� The WiRa is in general used for applications with a reading

area starting with 20 cm� At this distance the values are significantly below the

maximum SAR values permitted by law� In case that use is intended for smaller

distances, the respective SAR values are numerically calculated� The assumptions

taken as basis (such as operating mode of the RFID system and characteristics

of the human tissue) ensure a conservative estimate of the exposure (worst case

scenario)�

The calculation was also made for the most sensitive constellation

i�e� for the case that members of the general public stay permanently in direct

vicinity of the antenna with their head or trunk�

If the distance between the person and the antenna is less than 3 cm, the

DTE820 ensures that the maximally allowed SAR is not reached with an antenna

input power of up to 0�34 W (25�31 dBm)� In all other cases the DTE820 can be

operated with the maximally radiated power of 0�5 W ERP (27 dBm) or an antenna

input power of 0�653 W (28�15 dBm)� The table below shows the maximum

input powers with which the antenna may be supplied to ensure that the basic

limit values of the SAR are not exceeded� Two different types of exposure are

differentiated:

RFID UHF Sensor

Max� input power Distance person

and DTE820 <

1 cm

1 cm < distance

person and

DTE820 < 7 cm

7 cm < distance

person and

DTE820

General public

Limit values head and trunk 2 W/kg

Limit values local limbs 4 W/kg

Pin = 0�32 W Pin = 1�84 W

Occupational exposure

Limit values head and trunk 10 W/kg Pin = 1�75 W Pin = 1�84 W

Occupational exposure

Limit values local limbs 20 W/kg Pin = 1�84 W

RFID UHF Sensor

9 Installation

9.1 Installation location

The operating principle of the antenna is influenced by the type of installation and

the environment�

Observe the following remarks for the selection of the installation location:

●Keep a distance of min� 70 cm to metal surfaces and the ground (see Figure 1)�

●When installed in front of a metal surface, use a mounting bracket that

establishes a distance of exactly 12 cm between the back of the device and the

metal surface (see Figure 2)�

●With direct installation on a metal surface (e�g� a plate as part of

a mounting bracket) use a square-shaped metal plate with the dimensions

16 x 16 cm (see Figure 3)�

●Avoid conductive objects such as tanks with liquids in the vicinity of the

installation location� The objects influence the performance of the antenna�

●Ensure sufficient heat dissipation at the installation location� The maximum

operating temperature indicated in the data sheet must not be exceeded�

min 70 cm

12 cm

max 16 cm

Figure 1: Distance to all sides min� 70 cm Figure 2: Distance

between device and

metal surface

exactly 12 cm

Figure 3:

Metal surface with

max� 16 cm x 16 cm

If the installation instructions are not adhered to, the antenna characteristics

change� The DETE820 must be newly assessed at the mounting location�

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