Read data in Serial Port in C#.net

Question

4.00/5 (2 votes)

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Hi friends,

This is my new task based on "serial Port".

It's new for me, so Please help to solve my Problem.

How do I read from Serial port and write to serial port via C#.net?

I tried it, but I didn't get proper result.
I give a my code.
Please verify and give me a solution.

In my form, I have 2 buttons and 1 text Box.
My Code:
In My Namespace:

using System.IO.Ports;
using System.IO;
using System.Windows.Forms;
using System.Data;
using System.Globalization;
using System.Threading;
using System.Resources;
Declaration of Serial Port
  public static SerialPort sp;
in Form Load event:
sp = new SerialPort();
         sp.PortName = "COM5"
         sp.Encoding = Encoding.ASCII;
         sp.BaudRate = 9600;
         sp.DataBits = 8;
         sp.StopBits = StopBits.One;
         sp.Parity = Parity.None;
         sp.ReadBufferSize = 4096;
         sp.NewLine = "\r\n";
         sp.Handshake = Handshake.None;
         sp.ReceivedBytesThreshold = 100000;

When I click write button:

try
       {
           sp.Open();
           sp.WriteLine(txtdata.Text);
           txtdata.Text = "";
           sp.Close();
       }
       catch (Exception ex)
       {
       }

When I click Read Button:

sp.Open();
sp.ReadTimeout = 500;
txtdata.Text ="";
String message = sp.ReadLine();
txtdata.Text = message;
sp.Close();

Problem is "Read Button".
I didn't get a result(What I wrote in the textbox).
Please Help, How to fix this Problem?

Thanks and Regards,
Lakshmi Narayanan.S

Posted 22-Jun-11 19:59pm

naraayanan

Updated 22-Jun-11 21:41pm

Dalek Dave

v3

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Comments

Dalek Dave 23-Jun-11 3:42am

Edited for Grammar, Syntax and Readability.

hrachk 26-Apr-14 3:16am

The operation has timed out. exeption

5 solutions

Solution 3

See at Microsoft

How to access serial and parallel ports[^]

Thanks.

Posted 22-Jun-11 21:20pm

Tarun Mangukiya

Comments

Dalek Dave 23-Jun-11 3:42am

Good Link.

Tarun Mangukiya 23-Jun-11 7:56am

Thanks.

Solution 1

please try the link given below:

Communication on a serial port in NET 2.0[^]

Serial Communication using C# and Whidbey[^]

Link[^]

Also when you are writing data into SerialPort, after that do not close the SerialPort. Try this i think this will help you.

Posted 22-Jun-11 20:05pm

2irfanshaikh

Updated 22-Jun-11 20:14pm

v3

Comments

naraayanan 23-Jun-11 2:10am

Thanks for your quick reply.
Regards,
Lakshmi Narayanan.S

Dalek Dave 23-Jun-11 3:42am

Good Links.

Solution 4

im also got problem same.. can someone give example easy code for reading data from serial port and display at textbox in visual Csharp

Posted 9-Oct-11 8:02am

mohamad shahrin

Solution 5

can u show me how have u connected ur device

Posted 24-Feb-14 0:54am

Member 10051186

Comments

CHill60 24-Feb-14 7:14am

If you have a question for one of the solution posters or the OP then use the "Have a Question or Comment" link next to the appropriate post. Don't post comments as solutions. Alternatively you can post a question of your own using the "Ask a Question" link

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-06-22T20:12:00

Of course if won't work this way. You can send data to serial port from the button event handler, but you cannot read this way. This is blocking operation.

You need to read all the time in a separate thread. When data comes, it will read it; you need to interpret data on the fly.

Please see my past solution on using thread with the serial port:
Serial Port in WPF Application[^].

It was about WPF but still applicable to your case. Only the invocation of the UI operation is a bit different. Generally, you cannot call anything related to UI from non-UI thread. Instead, you need to use the method Invoke or BeginInvoke of System.Windows.Threading.Dispatcher (for both Forms or WPF) or System.Windows.Forms.Control (Forms only).

You will find detailed explanation of how it works and code samples in my past answers:
Control.Invoke() vs. Control.BeginInvoke()[^],
Problem with Treeview Scanner And MD5[^].

See also more references on threading:
How to get a keydown event to operate on a different thread in vb.net[^],
Control events not firing after enable disable + multithreading[^].

To use the similar invocation mechanism to the thread other than UI thread, see my Tips/Tricks article with full source code and usage samples: Simple Blocking Queue for Thread Communication and Inter-thread Invocation[^].

—SA

Read data in Serial Port in C#.net

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