[C#]Serial Port Send and Receive Data

Mon, 17 Jul 2017 14:12:53 +0000

Client Class

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

namespace COMClient
{
 public class COMClient
 {
 private SerialPort sp = null;

 public COMClient(string COM)
 {
 this.sp = new SerialPort(COM);
 // Open a new serial port connection
 this.sp.Open();
 // Discard data from the serial driver's receive buffer
 this.sp.DiscardInBuffer();
 // Discard data from the serial driver's transmit buffer
 this.sp.DiscardOutBuffer();
 }

 ~COMClient()
 {
 // Close the port connection
 this.sp.Close();
 }

 public void sendMsg(string msg)
 {
 // Write the specified number of bytes to the serial port using buffer data
 this.sp.WriteLine(msg);
 }
 }
}

Client call:

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COMClient.COMClient com_client = new COMClient.COMClient("COM4");
com_client.sendMsg("Hello World!");

Server:

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

namespace COM_Server
{
 class Program
 {
 static void Main(string[] args)
 {
 // Iterate through the serial port name array
 foreach (string port in System.IO.Ports.SerialPort.GetPortNames())
 {
 Console.WriteLine(port);
 }

 byte[] b = new byte[32];
 SerialPort sp = new SerialPort("COM3");

 while (true)
 {
 // Open a new serial port connection
 sp.Open();
 // Discard data from the serial driver's receive buffer
 sp.DiscardInBuffer();
 // Discard data from the serial driver's transmit buffer
 sp.DiscardOutBuffer();
 // Read bytes from the serial input buffer and write them at the specified offset in a byte array
 string msg = sp.ReadLine();
 StringBuilder sb = new StringBuilder();
 Console.Write(msg);
 // Close the port connection
 sp.Close();
 // Suspend the current thread for 500 milliseconds
 System.Threading.Thread.Sleep(500);
 }
 }
 }
}

A virtual serial port is needed here — just install VSPD. Here we configure virtual serial ports COM3 and COM4:

Server startup screenshot:

Client sending screenshot:

Server receiving screenshot:

Serial Port on Coinidea's Blog

[C#]Serial Port Send and Receive Data