在 C# 中使用总线 RS 485 和协议 DLMS 进行串行通信

Question

我有一个带有 DLMS 协议的电表、总线 RS 485 和 RS 485 转换器与我的计算机相连。我正在尝试与 DLMS 串行通信。

代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;

namespace DLMSRS485Console
{
    class Program
    {
        static void Main(string[] args)
        {
            SerialPort myPort = new SerialPort();
            myPort.PortName = "COM5";
            myPort.BaudRate = 300;
            myPort.Parity = Parity.None;
            myPort.StopBits = StopBits.One;
            myPort.DataBits = 8;
            myPort.Handshake = Handshake.None;
            myPort.RtsEnable = true;
            myPort.Open();
            myPort.WriteLine("/?!\r\n");
            myPort.DataReceived += new SerialDataReceivedEventHandler(myPort_DataReceived);
            Console.ReadKey();
            myPort.Close();
        }
        private static void myPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            string data = sp.ReadExisting();
            Console.Write("Bytes to read : ");
            Console.WriteLine(sp.BytesToRead);
            while (sp.BytesToRead > 0)
            {
                Console.WriteLine(data);
            }
        }
    }
}

我的问题是：

我运行这段代码，它什么也没显示。

预期输出为：

我需要任何回复。我尝试了不同的方法，阅读了很多文章，但问题并没有解决。我可以使用软件 ComTestSerial 来检查它是否响应。是的，它现在响应我希望它通过我的代码发回任何回复。

提前致谢，如有任何回复，我们将不胜感激。

更新 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;

namespace DLMSRS485Console
{
    class Program
    {
        static void Main(string[] args)
        {
            SerialPort myPort = new SerialPort("COM5");
            //myPort.PortName = "COM5";
            myPort.BaudRate = 9600;
            myPort.Parity = Parity.None;
            myPort.StopBits = StopBits.One;
            myPort.DataBits = 8;
            myPort.Handshake = Handshake.None;
            myPort.RtsEnable = true;
            myPort.Open();
            myPort.DataReceived += new SerialDataReceivedEventHandler(myPort_DataReceived);
            myPort.WriteLine("Hello\n");
            Console.Write("Bytes to read : ");
            int b = myPort.BytesToRead;
            Console.WriteLine(b);
            //myPort.WriteLine("rtfm ^^");
            Console.ReadKey();
            myPort.Close();
        }
        private static void myPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            string data = sp.ReadExisting();
            Console.Write("Bytes to read : ");
            Console.WriteLine(sp.BytesToRead);
            Console.WriteLine(data);
        }
    }
}

Answer 1

Problem
I run this code and it shows nothing.

这一行之后：

string data = sp.ReadExisting();

BytesToRead 将是 0。所以你永远不会进入你的 while 循环来显示读取 data。删除 while 循环并只显示数据：

private static void myPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    SerialPort sp = (SerialPort)sender;

    Console.Write("Bytes to read : ");
    Console.WriteLine(sp.BytesToRead);

    string data = sp.ReadExisting();
    Console.WriteLine(data);
}

在 C# 中使用总线 RS 485 和协议 DLMS 进行串行通信

Serial Communication with bus RS 485 and protocol DLMS in C#

c#

serial-port

rs485