我编写了以下程序来了解如何使用 JAMOD 访问线圈。不幸的是,它抛出了错误-
java.lang.IndexOutOfBoundsException
at java.io.BufferedInputStream.read(Unknown Source)
at java.io.DataInputStream.read(Unknown Source)
at net.wimpi.modbus.io.ModbusTCPTransport.readResponse(ModbusTCPTransport.java:177)
at net.wimpi.modbus.io.ModbusTCPTransaction.execute(ModbusTCPTransaction.java:193)
at TempReader.main(TempReader.java:27)
. x2 more times
.
java.io.EOFException
at java.io.DataInputStream.readUnsignedByte(Unknown Source)
at net.wimpi.modbus.io.BytesInputStream.readUnsignedByte(BytesInputStream.java:153)
at net.wimpi.modbus.io.ModbusTCPTransport.readResponse(ModbusTCPTransport.java:182)
at net.wimpi.modbus.io.ModbusTCPTransaction.execute(ModbusTCPTransaction.java:193)
at TempReader.main(TempReader.java:30)
net.wimpi.modbus.ModbusIOException: Executing transaction failed (tried 3 times)
at net.wimpi.modbus.io.ModbusTCPTransaction.execute(ModbusTCPTransaction.java:197)
at TempReader.main(TempReader.java:30)
在程序第 27 行是“trans.execute()”。我试图读取的线圈地址是 0x7D1 (2001) 或通道 0 数据类型是 2 个字。-
import java.net.*;
import java.io.*;
import net.wimpi.modbus.*;
import net.wimpi.modbus.msg.*;
import net.wimpi.modbus.io.*;
import net.wimpi.modbus.net.*;
import net.wimpi.modbus.util.*;
public class TempReader {
public static void main(String Args[]){
TCPMasterConnection con = null;
ModbusTCPTransaction trans = null;
ReadCoilsRequest rcreq=null;
ReadCoilsResponse rcres=null;
InetAddress addr = null;
int port = Modbus.DEFAULT_PORT;
byte byteArray[]={(byte)192, (byte)168, (byte)0, (byte)182};
try {
addr=InetAddress.getByAddress(byteArray);
con=new TCPMasterConnection(addr);
con.setPort(502);
con.connect();
rcreq=new ReadCoilsRequest(2001, 1);
trans=new ModbusTCPTransaction(con);
trans.setRequest(rcreq);
trans.execute();
rcres=(ReadCoilsResponse)trans.getResponse();
System.out.println("Response : "+rcres.getCoils().toString());
con.close();
}
catch(Exception e){
con.close();
e.printStackTrace();
}
}
}
错误当然会重复 3 次,如 ModbusTCPTransport 类中设置的(我检查了类源),即在退出和程序退出之前尝试 3 次。
我哪里错了?