我想利用功能码= 03,这意味着读取保持寄存器,但是在连接硬件后我遇到了一些错误。
我使用了 j2mod-1.06 jar 文件和 rxtx。我正在使用 eclipse。在 eclipse 中,在覆盖会话期间,这部分显示为红色,这意味着它没有运行。
catch (Exception exception)
{
System.out.println("Not Run");
exception.printStackTrace();
}
/* Read the first four holding registers */
try
{
slaveResponse = serialMaster.readMultipleRegisters(unitID, startingRegister, registerCount);
for (int i = 0; i < slaveResponse.length; i++)
{
System.out.println("reg" + i + " = " + slaveResponse[i]);
}
}
这是它的代码
import com.ghgande.j2mod.modbus.facade.ModbusSerialMaster;
import com.ghgande.j2mod.modbus.Modbus;
import com.ghgande.j2mod.modbus.ModbusException;
import com.ghgande.j2mod.modbus.procimg.Register;
import com.ghgande.j2mod.modbus.util.SerialParameters;
public class ModbusMaster
{
/**
* @param args
*/
public static void main(String[] args)
{
/* The important instances of the classes mentioned before */
ModbusSerialMaster serialMaster = null; // the connection
/* Variables for storying the parameters */
String portname = "COM3"; // the name of the serial port to be used
int unitID = 1 ; // the unit identifier we will be talking to
int startingRegister = 10001; // the reference, where to start reading from
int registerCount = 0; // the count of the input registers to read
Register[] slaveResponse = new Register[registerCount];
try
{
/* Setup the serial parameters */
SerialParameters parameters = new SerialParameters();
parameters.setPortName(portname);
parameters.setBaudRate(9600);
parameters.setDatabits(8);
parameters.setParity("None");
parameters.setStopbits(1);
parameters.setEncoding(Modbus.SERIAL_ENCODING_RTU);
parameters.setEcho(false);
/* Open the connection */
serialMaster = new ModbusSerialMaster(parameters);
serialMaster.connect();
}
catch (Exception exception)
{
System.out.println("Not Run");
exception.printStackTrace();
}
/* Read the first four holding registers */
try
{
slaveResponse = serialMaster.readMultipleRegisters(unitID, startingRegister, registerCount);
for (int i = 0; i < slaveResponse.length; i++)
{
System.out.println("reg" + i + " = " + slaveResponse[i]);
}
}
catch (ModbusException e)
{
e.printStackTrace();
}
/* Close the connection */
serialMaster.disconnect();
}
}
这是我得到的错误。
com.ghgande.j2mod.modbus.ModbusIOException: I/O exception - failed to read
at com.ghgande.j2mod.modbus.io.ModbusRTUTransport.readResponse(ModbusRTUTransport.java:645)
at com.ghgande.j2mod.modbus.io.ModbusSerialTransaction.execute(ModbusSerialTransaction.java:189)
at com.ghgande.j2mod.modbus.facade.ModbusSerialMaster.readMultipleRegisters(ModbusSerialMaster.java:269)
at ModbusMaster.main(ModbusMaster.java:53)
你能帮我解决这个问题吗? 代码: ModbusTCPMaster 主站 = new ModbusTCPMaster(ipAddress, 102); //替换为实际的PLC IP地址 master.setReconnecting(true);//设置Modbus端口号 尝试 { master.connect(); //连接PLC //读取保存记录中的数据 寄存器[] SlaveResponse = 新寄存器[0]; BitVector bitVector = master.readInputDiscretes(0x00, 001, 1); System.out.println(bitVector); master.disconnect(); // 断开连接 } catch (异常 e) { 抛出新的运行时异常(e); } 这里:master.readInputDiscretes(0x00, 001, 1); 问题:我不知道该方法的参数,并且运行结果“com.ghgande.j2mod.modbus.ModbusIOException:执行事务00 04 00 00 00 06 00 02 00 01 00 01失败(尝试了5次)一般异常 - 失败阅读 - 连接重置”