Java 串行事件值和串行端口值之间的差异

我正在使用jssc从串行端口读取值。一旦我写入串行端口，将调用以下回调。在该回调中，我可以从事件和串口本身获取值，两者都包含不同的值。我想知道串行端口值和串行事件值之间的差异。事件是否包含来自串行端口的值

public class PortReader implements SerialPortEventListener {

SerialPort serialPort;
public PortReader(SerialPort serialPort) {
    this.serialPort = serialPort;
}

@Override
public void serialEvent(SerialPortEvent event) {
    System.out.println("started");
    if (event.isRXCHAR() && event.getEventValue() > 0) {
        try {
            String receivedData =  serialPort.readString(event.getEventValue());
            System.out.println("Received response: " + receivedData);
            receivedData = serialPort.readString();
            System.out.println("Received response: " + receivedData);
        } catch (SerialPortException ex) {
            System.out.println("Error in receiving string from COM-port: " + ex);
        }
    }
}
}

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根据JSSC的文档，事件值是JSSC特定的，而事件携带的数据来自串行端口