modbus4j.jar实现modbus tcp协议

在这章是用<a target=_blank href="http://download.youkuaiyun.com/detail/linxingqianglai/9330571" target="_blank">modbus4j.jar</a>和<a target=_blank href="http://download.youkuaiyun.com/detail/linxingqianglai/9330571" target="_blank">seroUtils.jar</a>导入包实现modbus协议。下面的例子是modbus tcp的demo，下一章是讲modbus urt协议的详解

package com.example.testhzau;

import java.util.Date;

import com.serotonin.modbus4j.ModbusFactory;
import com.serotonin.modbus4j.ModbusMaster;
import com.serotonin.modbus4j.exception.ModbusInitException;
import com.serotonin.modbus4j.exception.ModbusTransportException;
import com.serotonin.modbus4j.ip.IpParameters;
import com.serotonin.modbus4j.msg.ModbusRequest;
import com.serotonin.modbus4j.msg.ModbusResponse;
import com.serotonin.modbus4j.msg.ReadHoldingRegistersRequest;
import com.serotonin.modbus4j.msg.WriteRegistersRequest;
import com.serotonin.modbus4j.msg.WriteRegistersResponse;
import com.serotonin.util.queue.ByteQueue; 
public class ReadAWriteUtil {
	public static void modbusWTCP(String ip, int port, int slaveId, int start, short[] values) {
		ModbusFactory modbusFactory = new ModbusFactory();
		// 设备ModbusTCP的Ip与端口，如果不设定端口则默认为502
		IpParameters params = new IpParameters();
		params.setHost(ip);
		if (502 != port) {
			params.setPort(port);
		}// 设置端口，默认502
		ModbusMaster tcpMaster = null;
		// 参数1：IP和端口信息 参数2：保持连接激活
		tcpMaster = modbusFactory.createTcpMaster(params, true);
		try {
			tcpMaster.init();
			System.out.println("===============" + 1111111);
		} catch (ModbusInitException e) {
			// System.out.println("11111111111111=="+"此处出现问题了啊!");
			// 如果出现了通信异常信息，则保存到数据库中
			 //CommunityExceptionRecord cer = new CommunityExceptionRecord();
			//cer.setDate(new Date());
			//cer.setIp(ip);
			// cer.setRemark(bgName+"出现连接异常");
			// batteryGroupRecordService.saveCommunityException(cer);
		}
		try {
			WriteRegistersRequest request = new WriteRegistersRequest(slaveId, start, values);
			WriteRegistersResponse response = (WriteRegistersResponse) tcpMaster.send(request);
			if (response.isException())
				System.out.println("Exception response: message=" + response.getExceptionMessage());
			else
				System.out.println("Success");
		} catch (ModbusTransportException e) {
			e.printStackTrace();
		}
	}
	
	public static ByteQueue modbusTCP(String ip, int port, int start,int readLenth) {
		ModbusFactory modbusFactory = new ModbusFactory();
		// 设备ModbusTCP的Ip与端口，如果不设定端口则默认为502
		IpParameters params = new IpParameters();
		params.setHost(ip);
		if(502!=port){params.setPort(port);}//设置端口，默认502
		ModbusMaster tcpMaster = null;
			tcpMaster = modbusFactory.createTcpMaster(params, true);
			try {
				tcpMaster.init();
				System.out.println("==============="+1111111);
			} catch (ModbusInitException e) {
				return null;
			}
			ModbusRequest modbusRequest=null;
			try {
				modbusRequest = new ReadHoldingRegistersRequest(1, start, readLenth);//功能码03
			} catch (ModbusTransportException e) {
				e.printStackTrace();
			}
			ModbusResponse modbusResponse=null;
			try {
				modbusResponse = tcpMaster.send(modbusRequest);
			} catch (ModbusTransportException e) {
				e.printStackTrace();
			}
			ByteQueue byteQueue= new ByteQueue(12);
			modbusResponse.write(byteQueue);
			System.out.println("功能码:"+modbusRequest.getFunctionCode());
			System.out.println("从站地址:"+modbusRequest.getSlaveId());
			System.out.println("收到的响应信息大小:"+byteQueue.size());
			System.out.println("收到的响应信息值:"+byteQueue);
			return byteQueue;
	}
}