Modbus工业协议在Android中的应用

现在工业信息画发展，很多工厂都需要做信息化展示，通常都是利用Android一体机来进行展示和交互。

Modbus协议是全球第一个用于工业现场的总线协议，与外设交互可以采用串口通信，tcp等方式；通常在Android中都是用tcp来进行读写，在Android中有Modbus4J.jar这个jar包使用；

简单介绍modbustcp：

读取的是从机 有几点需要知道 从机的ip地址，端口号（一般为502），slaveID,需要读的寄存器地址

读保持寄存器的功能号为03

先需要根据ip连接：

private void connectIP() {
        try {
            IpParameters tcpParameters = new IpParameters();
            tcpParameters.setHost(MyApplication.getInstance().getIp_electric());
            tcpParameters.setPort(PORT);
            ModbusFactory modbusFactory = new ModbusFactory();

            master = modbusFactory.createTcpMaster(tcpParameters, true);
            master.setTimeout(TIME_OUT);
            master.setRetries(0);
            master.init();
            if (master.isInitialized()) {
                mConnected = true;
                new Thread(readTask).start();
            }
        } catch (Exception e) {
            master.destroy();
            e.printStackTrace();
            // L.e(getClass().getSimpleName(), e.getMessage());

            try {
                Thread.sleep(10 * 1000);
            } catch (Exception ex) {
            }
            connectIP();
        }
    }

由以上代码当master初始化成功之后 开棋=

    /**
     * 板卡读线程
     */

    public Runnable readTask = new Runnable() {
        @SuppressLint("SimpleDateFormat")
        @SuppressWarnings("static-access")
        @Override
        public void run() {
            while (mConnected) {
                try {
                    String msg = Utils.imitateData(master, SLAVE_ID).toString();
                    Log.i("msg", msg);
                    Map<String, String> map = Utils.formatResult(msg);

                    str = msg;
                    Thread.currentThread().sleep(1000);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    };

msg为读取结果 独取出来是类似与多个键值对的形式 需要自己进行拆分
imitateData为读取数据的方法 如下：

public static BatchResults<String> imitateData(ModbusMaster master,
			int slaveID) {
		BatchResults<String> results = null;
		BatchRead<String> batchRead = new BatchRead<String>();

		//读int部分
		batchRead.addLocator(Config.Voltage_1, BaseLocator.holdingRegister(
				slaveID, 0000, DataType.TWO_BYTE_INT_UNSIGNED));
		batchRead.addLocator(Config.Voltage_2, BaseLocator.holdingRegister(
				slaveID, 0002, DataType.TWO_BYTE_INT_UNSIGNED));

		batchRead
				.addLocator(Config.Electricity_1, BaseLocator
						.holdingRegister(slaveID, 0004,
								DataType.TWO_BYTE_INT_UNSIGNED));
		batchRead
				.addLocator(Config.Electricity_2, BaseLocator
						.holdingRegister(slaveID, 0006,
								DataType.TWO_BYTE_INT_UNSIGNED));

		//读float部分 电表1
		batchRead.addLocator(Config.Voltage_Va_1, BaseLocator.holdingRegister(
				slaveID, 8, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Voltage_Vb_1, BaseLocator.holdingRegister(
				slaveID, 10, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Voltage_Vc_1, BaseLocator
				.holdingRegister(slaveID, 12, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Voltage_Avg_1, BaseLocator
				.holdingRegister(slaveID, 14, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Electricity_A_1, BaseLocator
				.holdingRegister(slaveID, 16, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Electricity_B_1, BaseLocator
				.holdingRegister(slaveID, 18, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Electricity_C_1, BaseLocator
				.holdingRegister(slaveID, 20, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Electricity_Avg_1, BaseLocator
				.holdingRegister(slaveID, 22, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Energy_Positive_1, BaseLocator
				.holdingRegister(slaveID, 24, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Energy_Reverse_1, BaseLocator
				.holdingRegister(slaveID, 26, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		//读电表2 float部分
		batchRead.addLocator(Config.Voltage_Va_2, BaseLocator
				.holdingRegister(slaveID, 28, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Voltage_Vb_2, BaseLocator
				.holdingRegister(slaveID, 30, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Voltage_Vc_2, BaseLocator
				.holdingRegister(slaveID, 32, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Voltage_Avg_2, BaseLocator
				.holdingRegister(slaveID, 34, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Electricity_A_2, BaseLocator
				.holdingRegister(slaveID, 36, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Electricity_B_2, BaseLocator
				.holdingRegister(slaveID, 38, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Electricity_C_2, BaseLocator
				.holdingRegister(slaveID, 40, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Electricity_Avg_2, BaseLocator
				.holdingRegister(slaveID, 42, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Energy_Positive_2, BaseLocator
				.holdingRegister(slaveID, 44, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		batchRead.addLocator(Config.Energy_Reverse_2, BaseLocator
				.holdingRegister(slaveID, 46, DataType.FOUR_BYTE_FLOAT_SWAPPED));

		try {
			results = master.send(batchRead);
		} catch (ModbusTransportException e) {
			e.printStackTrace();
		} catch (ErrorResponseException e) {
			e.printStackTrace();
		}
		return results;
	}

　　以上就根据每个寄存器的数据类型进行读取0-46位的数据