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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?

Michael Roland
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KarnakerReddy Gaddampally
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1 Answers1

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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:

  1. APDU command : 0xFF, 0xCA, 0x00, 0x00, 0x00
  2. Send APDU using send/transmit command(according to given SDK of the reader)
  3. Get response
  4. convert response(which is in byte or unsigned char) to char
  5. Print reponse
Jyo the Whiff
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  • Thankyou for the response @Jyo. Is this what you are talking about.byte[] command = { (byte) 0xFF, (byte) 0xCA, (byte) 0x00, (byte) 0x00, (byte) 0x00 }; byte[] response = new byte[300]; int responseLength; responseLength = reader.transmit(slotNum, command, command.length, response,response.length); System.out.println(new String(response)); – KarnakerReddy Gaddampally May 07 '15 at 13:27
  • Yeah, your command is right, send it according to transmit command given in the SDK of your reader.To print response, convert response from byte->char. – Jyo the Whiff May 08 '15 at 05:25
  • how can you create reader object instance ? – ralphgabb Nov 13 '15 at 05:51
  • Creating an object of the reader is depend on the given SDK for the reader, as SDK is developed by reader vendor, syntax may vary accordingly. – Jyo the Whiff Nov 25 '15 at 10:30