未连接modbus TCP

Question

我有一个问题，通过以太网modbus tcp连接。我将权限插入到AndroidManifest中，然后创建任务或连接和读取Modbus。我使用jamod库。

当我启动时，应用程序给我一个连接失败的错误。

这是我使用的代码：

class Task implements Runnable {

    @
    Override

    public void run() {

        try {
            ReadMultipleRegistersResponse result = null;

            //Read And Write Register Sample
            int port = Modbus.DEFAULT_PORT;
            String refe = "4000"; //HEX Address
            int ref = Integer.parseInt(refe, 16); //Hex to int          
            int count = 98; //the number Address to read
            int SlaveAddr = 1;
            String astr = "192.168.0.18"; //Modbus Device                  

            InetAddress addr = InetAddress.getByName(astr);
            TCPMasterConnection con = new TCPMasterConnection(addr);
            ModbusTCPTransaction trans = null; //the transaction


            //1.Prepare the request
            /************************************/
            ReadMultipleRegistersRequest Rreq = new ReadMultipleRegistersRequest(ref, count);
            ReadMultipleRegistersResponse Rres = new ReadMultipleRegistersResponse();

            Rreq.setUnitID(SlaveAddr); //set Slave Address  
            Rres.setUnitID(SlaveAddr); //set Slave Address

            //2. Open the connection
            con.setPort(port);

            con.connect();

            con.setTimeout(2500);

            //3. Start Transaction
            trans = new ModbusTCPTransaction(con);
            trans.setRetries(5);

            trans.setReconnecting(true);
            trans.setRequest(Rreq);
            trans.execute();

            /*Print Response*/
            Rres = (ReadMultipleRegistersResponse) trans.getResponse();
        } catch (ModbusSlaveException me) {

        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (java.lang.Exception e) {;
            e.printStackTrace();
        }

    }

}

我哪里做错了？

Answer 1

请按照以下步骤操作

1. 检查从设备是否正常工作
2. 检查与主设备具有相同网络的从设备
3. 检查端口安全设置(默认为502)