Introduction; Getting Started; Cable Connection; Enumeration - Elatec TWN4 Technical Handbook

Elatec GmbH

1. Introduction

The transponder reader TWN4 is a device for reading and writing RFID
transponders. There are different versions of TWN4 devices available,
which cover a large range of transponder types both in the frequency range
of 125 kHz and 13.56 MHz.

2. Getting Started

2.1 Cable Connection

In order to start operating a TWN4 transponder reader, it simply has to be
connected to a host.

2.2 Enumeration

Once the device has been powered up, it is waiting for completion of the
enumeration by the USB host. As long as the device is not enumerated, it is
entering a minimum power consumption mode, where both LEDs are
turned off.

2.3 Initialization

After powering up and enumeration, the device is turning on the built-in
transponder reader logic. The green LED is turned on permanently. Some
transponder readers need some kind of initialization, which is performed in
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