// Send pseudo APDU to retrieve the card serial number (UID)
int cla = 0xFF;
int ins = 0xCA;
int p1 = 0x00;
int p2 = 0x00;
byte[] data = null;
int dataOffset = 0x00;
int dataLength = 0x00;
int le = 0x00;

CommandAPDU getDataApdu = new CommandAPDU(cla, ins, p1, p2, data, dataOffset, dataLength, le);
ResponseAPDU r1 = channel.transmit(getDataApdu);

// wait 10 seconds for a card
CardTerminal terminal = terminal.waitForCardPresent(10000);

Card card = terminal.connect("*");
ATR atr = card.getATR();