java DLT645协议编解码通讯代码实现

以下是Java实现DLT645协议的编解码通讯的基本代码实现，仅供参考：

1. 连接电能表

import jssc.SerialPort;
import jssc.SerialPortException;

public class DLT645Connect {
    private SerialPort serialPort;

    public void connect(String portName) {
        serialPort = new SerialPort(portName);
        try {
            // 设置串口参数
            serialPort.openPort();
            serialPort.setParams(SerialPort.BAUDRATE_9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
        } catch (SerialPortException e) {
            e.printStackTrace();
        }
    }

    public void disconnect() {
        try {
            serialPort.closePort();
        } catch (SerialPortException e) {
            e.printStackTrace();
        }
    }

    public byte[] sendCommand(byte[] cmd) {
        byte[] response = null;
        try {
            serialPort.writeBytes(cmd);
            response = serialPort.readBytes(10, 2000); // 等待最多2秒钟
        } catch (SerialPortException e) {
            e.printStackTrace();
        }
        return response;
    }
}

2. 发送请求帧

public class DLT645Protocol {
    private static final byte[] START_CODE = new byte[] { (byte) 0xFE };
    private static final byte[] ADDRESS_CODE = new byte[] { (byte) 0x68, 0x01, 0x00, 0x00, 0x00, 0x01 };
    private static final byte[] CONTROL_CODE = new byte[] { (byte) 0x11 };
    private static final byte[] REQUEST_CODE = new byte[] { 0x01, 0x02, 0x43, 0x03 };
    private static final byte[] END_CODE = new byte[] { (byte) 0x16 };

    private DLT645Connect connect;

    public DLT645Protocol(DLT645Connect connect) {
        this.connect = connect;
    }

    public double readEnergy() {
        byte[] cmd = buildCommand(REQUEST_CODE);
        byte[] response = connect.sendCommand(cmd);
        double energy = parseEnergy(response);
        return energy;
    }

    private byte[] buildCommand(byte[] data) {
        byte[] cmd = new byte[15];
        int len = data.length;
        int sum = 0;
        for (int i = 0; i < len; i++) {
            cmd[i + 5] = data[i];
            sum += data[i];
        }
        sum += 0x68 + 0x11 + len;
        cmd[0] = START_CODE[0];
        System.arraycopy(ADDRESS_CODE, 0, cmd, 1, 6);
        cmd[7] = CONTROL_CODE[0];
        cmd[8] = (byte) len;
        System.arraycopy(data, 0, cmd, 9, len);
        cmd[9 + len] = (byte) (sum & 0xFF);
        cmd[10 + len] = END_CODE[0];
        return cmd;
    }
}

3. 接收响应帧

public class DLT645Protocol {
    private static final byte[] START_CODE = new byte[] { (byte) 0xFE };
    private static final byte[] ADDRESS_CODE = new byte[] { (byte) 0x68, 0x01, 0x00, 0x00, 0x00, 0x01 };
    private static final byte[] CONTROL_CODE = new byte[] { (byte) 0x11 };
    private static final byte[] REQUEST_CODE = new byte[] { 0x01, 0x02, 0x43, 0x03 };
    private static final byte[] END_CODE = new byte[] { (byte) 0x16 };

    private DLT645Connect connect;

    public DLT645Protocol(DLT645Connect connect) {
        this.connect = connect;
    }

    public double readEnergy() {
        byte[] cmd = buildCommand(REQUEST_CODE);
        byte[] response = connect.sendCommand(cmd);
        double energy = parseEnergy(response);
        return energy;
    }

    private byte[] buildCommand(byte[] data) {
        byte[] cmd = new byte[15];
        int len = data.length;
        int sum = 0;
        for (int i = 0; i < len; i++) {
            cmd[i + 5] = data[i];
            sum += data[i];
        }
        sum += 0x68 + 0x11 + len;
        cmd[0] = START_CODE[0];
        System.arraycopy(ADDRESS_CODE, 0, cmd, 1, 6);
        cmd[7] = CONTROL_CODE[0];
        cmd[8] = (byte) len;
        System.arraycopy(data, 0, cmd, 9, len);
        cmd[9 + len] = (byte) (sum & 0xFF);
        cmd[10 + len] = END_CODE[0];
        return cmd;
    }

    private double parseEnergy(byte[] response) {
        double energy = Double.NaN;
        if (response != null && response.length >= 14) {
            int dataLen = response[8];
            if (response.length == 14 + dataLen && response[0] == START_CODE[0] && response[6] == CONTROL_CODE[0]
                    && response[7] == dataLen) {
                int sum = 0;
                for (int i = 0; i < dataLen; i++) {
                    sum += response[i + 9] & 0xFF;
                }
                sum += 0x68 + 0x91 + dataLen;
                if ((sum & 0xFF) == response[response.length - 2]) {
                    int value = 0;
                    for (int i = 0; i < dataLen; i++) {
                        value <<= 8;
                        value |= response[i + 9] & 0xFF;
                    }
                    energy = value * 0.01;
                }
            }
        }
        return energy;
    }
}

需要注意的是，上述代码仅为示例代码，并未进行完整测试和优化，具体实现还需要根据实际需求进行调整和完善。