I've been testing and working on my RFID scanner code and I found something weird. When I tap the card, there are some instances where the results are truncated.
Examples:
Tap 1: [2]1,000,007 ,000242985
Tap 2: 7[3][2]1,000,0 07,0002429
Tap 3: 857[3][2]1,000 ,007,00024
Tap n: etc.
Expected Output:
[2]R,AAA,TTT,NNNNNNNNNN[3]
R = if the ID is registered or not: flags 1 and 0
A = The address where the ID is located inside the scanner's memory
T = the type of card
N = the ID number
If I understand correctly, the transmission starts and ends with a ASCII character 2 and 3. So it looks like what I'm getting is an incomplete result. How can I solve this?
Here is my full code:
import jssc.SerialPort;
import jssc.SerialPortEvent;
import jssc.SerialPortEventListener;
import jssc.SerialPortException;
public class ComControl{
static SerialPort serialPort;
String[] collector;
public static void main(String[] args) {
serialPort = new SerialPort("COM6");
try {
serialPort.openPort();//Open serial port
serialPort.setParams(SerialPort.BAUDRATE_9600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);//Set params. Also you can set params by this string: serialPort.setParams(9600, 8, 1, 0);
serialPort.writeBytes("\002v0\003".getBytes());//Write data to port
serialPort.closePort();//Close serial port
}
catch (SerialPortException ex) {
System.out.println(ex);
}
try {
serialPort.openPort();//Open port
serialPort.setParams(9600, 8, 1, 0);//Set params
int mask = SerialPort.MASK_RXCHAR + SerialPort.MASK_CTS + SerialPort.MASK_DSR;//Prepare mask
serialPort.setEventsMask(mask);//Set mask
serialPort.addEventListener(new SerialPortReader());//Add SerialPortEventListener
}
catch (SerialPortException ex) {
System.out.println(ex);
}
}
static class SerialPortReader implements SerialPortEventListener {
@Override
public void serialEvent(SerialPortEvent event) {
try{
}catch(Exception e){
System.out.println(e);
}
if(event.isRXCHAR()){//If data is available
if(event.getEventValue() == 10){//Check bytes count in the input buffer
//Read data, if 10 bytes available
String sizer="";
try{
sizer="";
sizer += serialPort.readString();
}catch (SerialPortException ex) {
System.out.println(ex);
}
System.out.println(sizer);
sizer = "";
}
}
// else if(event.isCTS()){//If CTS line has changed state
// if(event.getEventValue() == 1){//If line is ON
// System.out.println("CTS - ON");
// }
// else {
// System.out.println("CTS - OFF");
// }
// }
// else if(event.isDSR()){///If DSR line has changed state
// if(event.getEventValue() == 1){//If line is ON
// System.out.println("DSR - ON");
// }
// else {
// System.out.println("DSR - OFF");
// }
// }
}
}
}
Here is information about the device I am using: Low Cost RFID Reader - e-Gizmo
