© 2022 ELATEC GmbH – TWN3 LEGIC NFC M user manual DocRev3 – 02/2022
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5
MODE OF OPERATION
The mode of operation described in the following chapter is based on a standard ELATEC RFID reader module 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 TWN3 LEGIC NFC M, 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 TWN3 LEGIC NFC M 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
This is only applicable for the USB version: 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 (in USB mode), the device is turning on its built-in transponder reader logic. The green LED is
turned on permanently. Some RFID reader modules 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 module has completed the initialization, it is entering normal operation. During normal operation, the reader
module is searching for a transponder continuously.
5.6
DETECTION OF A TRANSPONDER
If a transponder is detected by the reader module, 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.
