Question

您好，我与这款动物RFID标签阅读器的沟通存在一些问题。我正在使用Rasperry Pi，Java和PI4J。我根据文档向读者发送命令：http://www.priority1design.com.au/rfidrw-e-usb.pdf

我尝试打开/关闭LED，获取固件版本和许多其他命令。我仍然得到答案0x00（命令不明白。）

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();
    }
}

你知道问题出在哪里吗？谢谢你的所有答案。

Answer 1

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

时

它暗示了这一点，我想知道你是否尝试过禁用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/

似乎还存在一个用于从控制台https://github.com/lurch/rpi-serial-console

切换端口的实用程序

RFIDRW-E-232无法理解Raspberry Pi的命令

1 个答案: