所以我正在尝试使用 JSSC 库向我的设备发送命令，但还没有成功。这是我的代码，从几个在线示例构建：
static SerialPort tPort = new SerialPort("/dev/ttyUSB0");
public static void main(String[] args) {
String[] portNames = SerialPortList.getPortNames();
for (String tPortName : portNames) {
System.out.println(tPortName);
}
try {
tPort.openPort();
tPort.setParams(
SerialPort.BAUDRATE_9600,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
tPort.setFlowControlMode(SerialPort.FLOWCONTROL_XONXOFF_IN|SerialPort.FLOWCONTROL_XONXOFF_OUT);
int mask = SerialPort.MASK_RXCHAR + SerialPort.MASK_CTS + SerialPort.MASK_DSR; //Prepare mask
tPort.writeBytes("AT".getBytes()); //Write data to port
tPort.setEventsMask(mask); //Set mask
tPort.addEventListener(new SerialPortReader()); //Add SerialPortEventListener
} catch (SerialPortException ex) {
ex.printStackTrace(System.out);
}
}
static class SerialPortReader implements SerialPortEventListener {
public void serialEvent(SerialPortEvent event) {
if(event.isRXCHAR()){//If data is available
System.out.println("available!");
if(event.getEventValue() == 10){//Check bytes count in the input buffer
//Read data, if 10 bytes available
try {
byte buffer[] = tPort.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");
}
}
}
}
当我运行它时，我得到的唯一输出是
CTS - OFF
DSR - OFF
设备没有明显响应。但是当我使用这个配置使用 minicom
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x A - Serial Device : /dev/ttyUSB0 x
x B - Lockfile Location : /var/lock x
x C - Callin Program : x
x D - Callout Program : x
x E - Bps/Par/Bits : 9600 8N1 x
x F - Hardware Flow Control : No x
x G - Software Flow Control : No x
x x
x Change which setting? x
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设备返回一些东西。
我做错了什么？
编辑：我尝试使用超时方法阅读，并且该方法不断抛出超时。