MetraTec HfMux-X Leitfaden

Technical Documentation

for metraTec HF Multiplexer (4, 8 and 16 Port)

Date: Decem er 2016

Version: 2.5

Technical Documentation metraTec HF Multiplexer Page 1 of 13

Ta le of Contents
General Information / Security Advice.................................................................................3
1 Notes on the use of this documentation........................................................................3
2 Security Advice..............................................................................................................3
3 Export Restrictions.........................................................................................................3
4 Further Documents........................................................................................................3
Product Description.............................................................................................................4
1 Intended Use.................................................................................................................4
2 Technical Specification..................................................................................................4
3 Product Drawing............................................................................................................5
4 Scope of Delivery..........................................................................................................5
Installation............................................................................................................................6
Antenna Selection................................................................................................................9
RF Specification..................................................................................................................10
Further Notes.....................................................................................................................11
1 Environmental..............................................................................................................11
2 Declaration of Conformity...........................................................................................11
Version Control..................................................................................................................12
Technical Documentation metraTec HF Multiplexer                                                                           Page 2 of 13

1 General Information / Security Advice

1.1 Notes on the use of this documentation

This user manual and integration guide uses different sym ols to point out potentially

dangerous situations. The following signs and sym ols are used throughout the document.

ATTENTION

Declares a potentially hazardous situation. If this is not avoided, the product

or something in its surrounding could e damaged.

NOTE

Declares notes for the user as well as other useful information, where no

harmful or dangerous situations can e expected.

1.2 Security Advice

The hfMux-X Multiplexers where not designed for use in dangerous environments. Using

these products in applications where a failure could directly result in severe injuries or death

(“high risk activities”) is not permitted. This includes ut is not limited to applications in

nuclear facilities, flight control systems, life support systems or weapon systems. The

manufacturer denies the suita ility of these devices for such scenarios.

1.3 Export Restrictions

All metraTec hfMux-X Multiplexers contain components that underlie US Export restrictions.

It is therefore for idden to export these products to countries that are on the US trade

em argo list. The same applies to any countries that are on the EU em argo list.

1.4 Further Documents

None

Technical Documentation metraTec HF Multiplexer Page 3 of 13

2 Product Description

The metraTec hfMux-X is an RFID multiplexer for HF systems with an operating frequency of

13.56 MHz and an RF output power of 2 W (-MP version) resp. 4 W (-HP version). It allows

connecting up to four, eight or 16 antennas (depending on the product version) to a single

antenna port. This reduces system complexity and setup costs in cases where many

antennas are needed and also lowers hardware system costs as the num er of RFID readers

needed decreases.

The device works irrespective of the manufacturer of the antennas and readers used.

Furthermore, the multiplexer has a very small size and a minimal power consumption which

ena les mo ile operation. For compati ility of the multiplexer with any other HF RFID

reader, please contact the metraTec Team.

Versions with 4, 8 and 16 antenna ports are availa le.

2.1 Intended Use

The hfMux-X HF Multiplexer is a device for switching etween RFID antenna ports at a

frequency of 13.56 MHz with an RF power of up to 2 Watt (-MP version) resp. 4 Watt (-HP

version. The device is not specified for any other application or frequency.

2.2 Technical Specification

Operating Frequency 13.56 MHz

Antenna Connector BNC

Voltage 24 V DC nom. (min 18 V DC – max 26 V DC)

Control Inputs 2-4 x 24 V DC, optically isolated

Power Consumption 60 mA

Switching Time 4 µs

Temperature Range -20 °C to +70 °C

Dimensions 130 x 106 x 44 mm (hfMux-4)

190 x 104 x 39 mm (hfMux-8 and -16)

Housing/Protection IP 40

Conformity CE, eg. EN 60950-1

Technical Documentation metraTec HF Multiplexer Page 4 of 13

2.3 Product Drawing

2.4 Scope of Delivery

The hfMux-X Multiplexer comes with the following parts:

•hfMux-X HF Multiplexer

•Control Ca le

•Documentation (availa le via download from metraTec's we site:

http://www.metratec.com  Support  Downloads)

Technical Documentation metraTec HF Multiplexer Page 5 of 13

Fig. 1: Drawing of hfMux-4 Multiplexer, other models

accordingly (all dimensions in mm

3 Installation

Installing the hfMux-X is an easy task for experienced electrical personnel. Some important

notes should e considered as listed at the end of the installation instructions.

Step 1:

Place the multiplexer in the desired installation location and attach it there if necessary. The

device does not have a preferential mounting orientation.

Step 2:

Both the reader connection and the antenna connections are connected via BNC

connectors. No special tools are necessary for this step.

Step 3:

Connect the control lines etween reader (or any other device that controls the multiplexer)

and the multiplexer. The device has optically isolated 24 V inputs which are used y many

industrial devices, e.g. PLCs. Each input needs a 24 V line (e.g. hfMux-4: Inputs IN1+ and

IN2+) as well as a ground line (IN1- and IN2- for hfMux-4) for the differential signal. If your

devices doesn't have single GND lines, you can connect all of them to the ground of the

controlling device.

If you use a metraTec RFID Reader to control the multiplexer, just connect the multiplexer

control ca le you should have received with the multiplexer.

Step 4:

Connect the multiplexer with a 24 V power source. This can come directly from the reader if

it supports this (Pins 24V and GND).

Technical Documentation metraTec HF Multiplexer Page 6 of 13

Technical Documentation metraTec HF Multiplexer Page 7 of 13

Fig. 4: Connector description of the hfMux-

Fig. 2: Connector description of the

hfMux-4

Fig. 3: Connector description of the

hfMux-8

ATTENTION

The output power of the reader may not exceed the maximum input power of

the multiplexer (2W resp. 4W). The RF in- and outputs may not e supplied

with CD offsets greater than 10 V. Disregarding may result in a damaged

device in oth cases.

ATTENTION

The multiplexer is not terminated. If there is no 50 Ohm load connected to

the selected antenna port, the signal will e reflected to the reader. This can

potentially damage the reader permanently. Please o serve the maximum

voltage standing wave ration (VSWR) of your reader.

Technical Documentation metraTec HF Multiplexer Page 8 of 13

4 Antenna Selection

The active antenna is selected using the digital inputs of the multiplexer. Input 1 is LSB. See

the following ta le for a complete overview. The multiplexer has a fail-safe feature. If there

is no control signal, the multiplexer will connect antenna port one as active port.

Input 1 Input 2 Input 3 (8x / 16x Input 4 (16x Active Antenna

LOW LOW LOW LOW Antenna 1

HIGH LOW LOW LOW Antenna 2

LOW HIGH LOW LOW Antenna 3

HIGH HIGH LOW LOW Antenna 4

LOW LOW HIGH LOW Antenna 5

HIGH LOW HIGH LOW Antenna 6

LOW HIGH HIGH LOW Antenna 7

HIGH HIGH HIGH LOW Antenna 8

LOW LOW LOW HIGH Antenna 9

HIGH LOW LOW HIGH Antenna 10

LOW HIGH LOW HIGH Antenna 11

HIGH HIGH LOW HIGH Antenna 12

LOW LOW HIGH HIGH Antenna 13

HIGH LOW HIGH HIGH Antenna 14

LOW HIGH HIGH HIGH Antenna 15

HIGH HIGH HIGH HIGH Antenna 16

Furthermore, the multiplexer is hot switcha le. This means that the antenna port can e

switched without having to turn off the HF signal. The power supply has to e connected,

however.

Technical Documentation metraTec HF Multiplexer Page 9 of 13

5 RF Specification

The following ta le shows the insertion loss (dampening of the signal when switched on)

and the channel isolation etween the antenna ports of the multiplexer. The values were

measured in the standard version of the multiplexer with BNC connectors.

Frequency Insertion Loss Channel Isolation

13.56 MHz 0.45 dB 43 dB

The input reflection ehavior depends strongly on the type of connector used and on the

quality of the connection (e.g. dependent on connector wear).

Technical Documentation metraTec HF Multiplexer Page 10 of 13

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