您好,我在与此动物RFID标签阅读器进行通讯时遇到一些问题。
我正在使用Rasperry Pi,Java和PI4J。
我正在根据文档向读者发送命令:http://www.priority1design.com.au/rfidrw-e-usb.pdf

我试图打开/关闭LED,获取固件版本和许多其他命令。我仍然得到答案0x00(命令不理解。)

这是我的主要方法:

public static void main(String[] args) {
    final Serial serial = SerialFactory.createInstance();

    try {
        serial.open(Serial.DEFAULT_COM_PORT, 9600);
        serial.addListener(new SerialDataListener() {
            @Override
            public void dataReceived(SerialDataEvent event) {
                try {
                    String data = event.getData();
                    byte[] array = data.getBytes("US-ASCII");
                    String s = "";
                    System.out.println("Read: ");
                    for (int i = 0; i < array.length; i++) {
                        s = s + String.format("%02X ", array[i]);
                    }
                    System.out.println(s);
                } catch (UnsupportedEncodingException ex) {
                }
            }
        });
        //byte [] data = "VER".getBytes("US-ASCII");
        String data = "VER";
        //byte [] data = {(byte) 0x56,(byte) 0x45,(byte) 0x52};

        serial.write(data);
        //serial.write("\r");
        Thread.sleep(3000);

        System.out.println("done");
    } catch (Exception e) {
        System.out.println(e.getMessage());
    } finally {
        serial.close();
    }
}


您知道问题出在哪里吗?
感谢所有答案。

最佳答案

我不知道这是否有帮助,但是当我看着pi4j Serial example page

它表明了这一点,我想知道您是否尝试过禁用COM端口作为控制台?

    // !! ATTENTION !!
    // By default, the serial port is configured as a console port
    // for interacting with the Linux OS shell.  If you want to use
    // the serial port in a software program, you must disable the
    // OS from using this port.  Please see this blog article by
    // Clayton Smith for step-by-step instructions on how to disable
    // the OS console for this port:
    // http://www.irrational.net/2012/04/19/using-the-raspberry-pis-serial-port/


似乎还存在用于从控制台https://github.com/lurch/rpi-serial-console切换端口的实用程序

10-07 16:19
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