Mode Of Operation; Operating Mode; Power Up; Enumeration - Elatec TWN4 MultiTech LEGIC 42 User Manual

5 MODE OF OPERATION

The mode of operation described in the following chapter is based on a standard ELATEC RFID reader equipped with two LEDs.
Depending on your product (number of LEDs, installed firmware, etc.) and in case the product settings have been modified with the
AppBlaster tool, the information below might differ from your product configuration when in operation. In particular, the color and
sequence of the LEDs on your product might be different.
5.1

OPERATING MODE

In order to start operating TWN4 MultiTech SmartCard LEGIC 42, it simply has to be connected directly to a host device.
5.2

POWER UP

In case of an external power supply unit is used, the following requirements must be satisfied:

Limited power source according to the safety standards listed in the respective declaration(s) of conformity

Short-circuit current < 8 A
Once TWN4 MultiTech SmartCard LEGIC 42 is connected to the host device, it detects the type of communications cable (e.g. USB
or RS-232), with which it is connected to the host.
In case of RS-232: Additionally, the RS-232 is sending a version string via RS-232 to the host device.
5.3

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.
5.4

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 readers need some kind of initialization, which is performed in this step. After successful initialization, the device
sounds a short sequence, which consists of a lower tone followed by a higher tone.
5.5

NORMAL OPERATION

As soon as the reader has completed the initialization, it is entering normal operation. During normal operation, the reader is searching
for a transponder continuously.
5.6

DETECTION OF A TRANSPONDER

If a transponder is detected by the reader, following actions are performed:

Send the ID to the host. By default, the USB device sends by emulating keystrokes of a keyboard. An RS-232 device sends the
ASCII code of an ID.

Sound a beep.

Turn off the green LED.

Blink the red LED for two seconds.

Turn on the green LED.
Within the two seconds timeout, where the red LED is blinking, the transponder, which just has been recognized will not be accepted
again. This prevents the reader from sending identical IDs more than one time to the host.
If during the two seconds timeout of the red LED a different transponder is detected, the complete sequence restarts immediately.
© 2022 ELATEC GmbH – TWN4 MultiTech SmartCard LEGIC 42 user manual DocRev1 – 03/2022 Page 8 of 14