public static void main(String[] args) {SerialParameters serialParameters = new SerialParameters();// 设定MODBUS通讯的串行口serialParameters.setCommPortId("com6");// 设定成无奇偶校验serialParameters.setParity(0);// 设定成数据位是8位serialParameters.setDataBits(8);// 设定为1个停止位serialParameters.setStopBits(1);// 设定端口名称serialParameters.setPortOwnerName("Numb nuts");// 设定端口波特率
        serialParameters.setBaudRate(BAUD_RATE);// 创建ModbusFactory工厂实例ModbusFactory modbusFactory = new ModbusFactory();// 创建ModbusMaster实例ModbusMaster master = modbusFactory.createRtuMaster(serialParameters);// 初始化try {master.init();/*** 读的位置从零开始，长度4* 长度大小是采集器寄存器的数量，寄存器的数量是采集器可接入的电流输入的路数*/readHoldingRegistersTest(master,SLAVE_ADDRESS,0,4);} catch (ModbusInitException e) {e.printStackTrace();} finally {master.destroy();}}private static void readHoldingRegistersTest(ModbusMaster master,int slaveId, int start, int len) {try {ReadHoldingRegistersRequest request = new ReadHoldingRegistersRequest(slaveId, start, len);ReadHoldingRegistersResponse response = (ReadHoldingRegistersResponse) master.send(request);if (response.isException()) {System.out.println("Exception response: message="+ response.getExceptionMessage());} else {System.out.println(Arrays.toString(response.getShortData()));short[] list = response.getShortData();for(int i = 0; i < list.length; i++){System.out.print(list[i] + " ");}System.out.println();int hight = (list[3] - 4000) /160;if(hight <= 0){System.out.println("水位高度为：0CM");}else{System.out.println("水位高度为：" + (hight + 13.5) + "CM");}}} catch (ModbusTransportException e) {e.printStackTrace();}}