我正在开发一个java应用程序，需要与连接有usb-to-rs232转换器的终端进行通信!!
现在我可以连接设备并发送数据!我可以确定终端收到了发送的数据，因为当终端收到东西时 LED 会发光!
我正在使用JSSC (链接:https://code.google.com/p/java-simple-serial-connector/wiki/jSSC_examples)...但由于某种原因，我从来没有从终端接收过任何数据。
我的代码(JSSC代码):
public class Main
{
static SerialPort serialPort;
public static void main(String[] args) throws InterruptedException
{
serialPort = new SerialPort("COM7");
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
serialPort.writeByte( (byte)0x02 );
TimeUnit.SECONDS.sleep( 10 );
byte[] b = serialPort.readBytes();
System.out.println( "bytes " + b );
}
catch (SerialPortException ex)
{
System.out.println(ex);
}
}
/*
* In this class must implement the method serialEvent, through it we learn about
* events that happened to our port. But we will not report on all events but only
* those that we put in the mask. In this case the arrival of the data and change the
* status lines CTS and DSR
*/
static class SerialPortReader implements SerialPortEventListener
{
public void serialEvent(SerialPortEvent event)
{
System.out.println( "Event raised!" );
if(event.isRXCHAR())
{//If data is available
if(event.getEventValue() == 10)
{//Check bytes count in the input buffer
//Read data, if 10 bytes available
try
{
byte buffer[] = serialPort.readBytes(10);
}
catch (SerialPortException ex)
{
System.out.println(ex);
}
}
}
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");
}
}
}
}
}
谁能帮我解决这个问题吗？
最佳答案
您是否打算对 USB-UART 使用硬件流控制。如果是，请尝试设置 DTR，然后设置 RTS。这告诉第一端第二端已准备好进行通信。另外还有10个字节没有收到或者根本没有收到数据。还要考虑另一个串口通信库，如 scm http://www.embeddedunveiled.com/
关于java - 从USB->RS232连接的终端接收数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19957662/