© 2021 ELATEC GmbH – TWN4 Slim user manual DocRev6 – 07/2021
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5
MODE OF OPERATION
5.1
OPERATING MODE
In order to start operating TWN4 Slim, 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:
•
4.3 V – 5.5 V via micro USB
•
Limited power source according to the safety norms listed in the respective declaration(s) of conformity
•
Short-circuit current < 8 A
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.
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 RFID 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.
5.7
SUSPEND MODE
Once the host is resuming to normal operation mode, this is also signaled via the USB bus. Therefore, the RFID reader will resume to
normal operation too.
Summary of Contents for TWN4 Slim
Page 1: ...TWN4 SLIM USER MANUAL ...
