Mode Of Operation; Operating Mode; Power Up; Enumeration - Elatec TWN4 MULTITECH 2 M User Manual

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 TWN4 MultiTech 2 M, it simply has to be connected directly to a host device.
5.2

POWER UP

Once TWN4 MultiTech 2 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:
•
A version string is sent via RS-232 to the host device.
•
A 5 V external power supply is required and must meet the following conditions:
o
PS2 classified power source according to IEC 62368-1
o
Short-circuit current < 8 A
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 the 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 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.
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 module 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.
© 2023 ELATEC GmbH – TWN4 MultiTech 2 M user manual – DocRev04 – EN – 07/2023 Page 8 of 13