Mode Of Operation; Operating Mode; Power Up; Enumeration - Elatec TWN4 MultiTech Series 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 ELATEC 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

To start operating the reader, it simply has to be connected directly to a host device.
5.2

POWER UP

Once the reader is connected to the host device, it detects the type of communication cable (e.g. USB,
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 ES1/PS2 classified power source according to IEC 62368-1
o Short-circuit current < 8 A
5.3

ENUMERATION

Only applicable for USB version of readers:
Once the reader has been powered up, it waits for completion of the enumeration by the USB host. As
long as the reader is not enumerated, it is in a minimum power consumption mode, where both LEDs
are turned off.
5.4

INITIALIZATION

After powering up and enumeration (USB mode), the reader turns on the built-in transponder reader
logic. The green LED is turned on permanently. Some RFID readers need some kind of initialization,
which is performed in this step. After successful initialization, the reader 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 enters the normal operation mode. During
normal operation, the reader searches for a transponder continuously.
5.6

DETECTION OF A TRANSPONDER

If a transponder is detected by the reader, the following actions are performed:
•
Send the ID to the host. By default, the USB devices send by emulating keystrokes of a keyboard.
RS-232 devices send 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.
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