After altering the baud rate, serial communication no longer works.

[ramen2k10]

I'm attempting to contact with a chip card device using serial communication, which is linked to a reader via a serial port. The communication works fine when I use the initial baud rate 9600, but when I change the initial baud rate (9600) of my serial port communication to a higher baud rate value (e.g. - 115200), the device closes the connection, despite the fact that the same device works fine with a higher baud rate using the javax.comm library. Please see the code snippet attached.

public void setBaudRate(int rate) throws UnsupportedCommOperationException {
	if (null != serialPort) {
		if (serialPort.getBaudRate() != rate) {
			boolean rts = serialPort.isRTS();
			boolean dtr = serialPort.isDTR();
        	serialPort = nrSerialPort.getSerialPortInstance();// Extracting the serialPort instance
        	serialPort.setSerialPortParams(rate, serialPort.getDataBits(), serialPort.getStopBits(), serialPort.getParity());
        	serialPort.setDTR(dtr);
		serialPort.setRTS(rts);
		}
	}
}

Is the baud rate changing supported by the nrjavaserial library?

[fkamming]

I'm attempting to contact with a chip card device using serial communication, which is linked to a reader via a serial port. The communication works fine when I use the initial baud rate 9600, but when I change the initial baud rate (9600) of my serial port communication to a higher baud rate value (e.g. - 115200), the device closes the connection, despite the fact that the same device works fine with a higher baud rate using the javax.comm library. Please see the code snippet attached.

public void setBaudRate(int rate) throws UnsupportedCommOperationException {
	if (null != serialPort) {
		if (serialPort.getBaudRate() != rate) {
			boolean rts = serialPort.isRTS();
			boolean dtr = serialPort.isDTR();
        	serialPort = nrSerialPort.getSerialPortInstance();// Extracting the serialPort instance
        	serialPort.setSerialPortParams(rate, serialPort.getDataBits(), serialPort.getStopBits(), serialPort.getParity());
        	serialPort.setDTR(dtr);
		serialPort.setRTS(rts);
		}
	}
}

Is the baud rate changing supported by the nrjavaserial library?

Changing baud rate works fine in our code. I suspect what is missing in your code is disconnecting and reconnecting. Before you set the new baud rate call serialPort.disconnect(). And afterwards call serialPort.connect().