How to get RFID tag from ACS122U NFC

I am working on ACS122U NFC which reads tag's RFID. From ACS http://www.acs.com.hk/en/products/3/acr122u-usb-nfc-reader/ I got the development kit which will only connect to the reader and gives the state when a tag is placed on the NFC reader. But I need to get the ID (UID, serial number) of a tag for further implementation. How can I get the ID of a tag?

Solution

In order to get UID you have to send an APDu command.

Please download the datasheet given at link : acr-122u datasheet

In that, check

4.1 Get Data

below this, Get UID APDU format,

FF CA 00 00 00

UPDATE :

Follow the steps:

APDU command : 0xFF, 0xCA, 0x00, 0x00, 0x00
Send APDU using send/transmit command(according to given SDK of the reader)
Get response
convert response(which is in byte or unsigned char) to char
Print reponse