Communicate with Serial Port in C#

Thanks for project

Very useful, thanks!!

Thanks for the example i used port "COM5" but can't run this error System.IO.IOException: 'A device which does not exist was specified.

How to read multiple port data to each textbox

Why do you use ThreadSleep(500) in Receive data handler ? Is it OK to use Thread Sleep function ? And Another question is , what if I want to use some buffer and run write thread which gets messages from this buffer and executes write ? another thing is if there are two cycling threads there is high cpu consumtions if there is no thread sleep ..

Hi, Ryan Alford. I get this message in the 1st reading, why? How to fix it? System.TimeoutException: 'The operation timed out.'

Error 1 The type or namespace name 'SetTextDeleg' could not be found (are you missing a using directive or an assembly reference?) please help me out

Nice article.Thanks for sharing..

Did anyone ever make a C# program that read serial ort from bar code scanner and save to database directly?

What about if I want to write on a port and at the same time get response from another serial port?

Nice...

Hi I am working with weigh bridge integration. I am getting some junk data.. ??? symbols in the data. i tried to trim but the output is like 3?19 instead of 3519 etc.. when i tried to replace ? i am loosing data.. any help regarding.

Serial port communication for glowing LED - High & Low, also to accept Input switch signal (digital high & low). In this case data received is not working. What is the alternative option?

good one...

Hi [email protected] sorry for late reply u check my blog arjunwalmiki i thing you found solution there i am already posted how to read data from comport in console

how to read data from multiple com port using single listener and save in data base

Hi Arjun. Tank you for the code. One problem I notice if weight changes it does not show change immediately in text box. Can you handle this please? my email address is [email protected]

Dear Friend those people are doing hardware programing must be take good hardware cable male and female it is play very important part of data reading

Zip file is corrupt.

hi Ryan i am using same code change that is _serialPort.Open(); _continue = true; readThread.Start(); _serialPort.DataReceived += new SerialDataReceivedEventHandler(_serialPort_DataReceived); or static void _serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e) { SerialPort _serialPort = (SerialPort)sender; Console.WriteLine(_serialPort.ReadExisting()); } but still not read data from port

Hi Ryan Alford Thanks for your code.but the program not read all data on serial port." all data on putty it's god " can you help me, please

Hi Ryan Alford Thanks for your code. it helps me lot. Can you tell me just one thing that you have written the code for the windows form,but is it possible to use the same code in case of web page.?? Please suggest

Sorry. I don't understand why. it can send data to serial port device but it can't receive from serial port device. i use visual C# 2010. can you help me, please

Sorry. I don't understand why. it can send data to serial port device but it can't receive form serial port device. i use visual C# 2010. can you help me, please ?

Sorry. I don't understand why. it can send data to serial port device but it can't receive form serial port device. i use visual C# 2010. can you help me, please ?

thank you very much, i hope it can work well

I want the code to change the SerialPort baud params on request by the user. How do I close / dispose SerialPort so I can re-open with new baud params? Or perhaps the params can be changed some other way.

i am writing an application in C# which communicates with serial port by sending hex data to the port. how can i convert a textbox.text contents into Hex values of the number displayed on the textbox.text (displays these data after computation). example: my textbox.text may display any of these values like 16,17,24,34,39,49,52,65,68,81,89,99,101 or 129. is there any method to convert the displayed values on the textbox to hexadecimal equivalent of the value on the textbox and write such to the serilport in byte only not hex string. exmple if my textbox.text displays say 50,it should be converted to hex value of 0x32 and sent to the serialport as ox32 and not like this ox31,0x32 in ascii any code/ clue will be welcomed.

i have a PBX device, i want to read data from PBX. how can i, as i don't have knowledge about usage of serial ports.

good application

hello, your article mentioned afore was pretty useful.. it gave me a direction.. i am trying to do a memory read operation on an embedded system and i give the address as hex input which is 32 bit.. i want the address to be sent to the embedded system through serial port as my embedded system only supports serial port, and again read the data from that memory location.. eg: memory location = 12345678 can u help me out??

Hi dude i would like to sent eight bit binary number to the serial port. Can you please help.

It was Very important article. Tnk u very much!

I try to use this program, but when i start the debug, i find this error: UnauthorizedAccessExeption - Access to COM1 is denied. I think that there is something to set in the security project's properties, like FileIOPermission or something else, but i don't know what... Can someone help me? Thanks a lot

I have a project, which is a sensor based visual game. So, I want to read the data from COM port. I do not want to store the data, I just want to check the data, and make some control due to the data change. Thus, how do I do to achieve this function?

please i need your help friends.i can't read data from sensor board MTS310CB ,please if there are any one know just tell me :)

Great Support, Really it wil help full for system application developer

Hi, I really appreciate you for sharing this important code online.Its really helpful.I have tried this code in windows application,its working without any issues.But I need to write the same code in asp.net.I have to read the data from serial port and write it into a textbox.I have tried lots of sample codes but ended up with a stack of errors.Could you please help me out? I need sample code like the above one for ASP.NET(C#). Pleae help me...its really urgent.. Thanks in Advance, Manasa

To whom it may concern, What is the best practice to avoid any UI hanging when you are trying to periodically communicate to a microcontroller to update the UI control values as well as process any command the user wants (ie read/write to the microcontroller) using the same serial communication port? Thanks! - tvp

im getting an error saying that my port is opened by something else. how do i find which process is using it

will the code work for gsm modem? i am not getting output when i am sending AT/r/n.I am expecting ok response from modem

Hi Ryan, Would you have a minute to describe how this code can be used to access the serial port on the workstation from a web page? I'm trying to create a web app that will print to a printer off the serial port. Thanks. Ahmed

Thanks for the very simple code. It helped me fix my problem quickly. T. Shupe

Thank you very much!

Hi All, IM trying to write Hex value to serial port to which microcontroller is connected. It is written in C# (windows application). When i click on "Send" button Hex values has to written to Serial Port, but i need to click on "Send" button 4 - 5 times to see the output on the Oscilloscope(testing purpose) and the values i get are also incorrect. If i send out 45 bytes of data, it read 67 byte. Hex values which im sending to microcontroller are 4E EF 2B A1 3F 2E B2 AF 25 C7 5C 00 00 00 00 00 00 DB Im using the following method to write data to serial port. Here im reading data from a text file using streamreader and looping in through and writing the data. while ((_strValue = _readfile.ReadLine()) != null) { _SerialPort.Write(_strValue); } im trying to write the first Hex value which is "4E" as string. Is this correct?

I have a glucose device that I am using to get readings from. I have been looking online for weeks now for a way to check what device is connected to which port. I was sending commands to every port until I could read from the port. I figured this was bad to send commands to ports like this because of it being unsafe. Is their no way of checking what device is connected to which port? I don't no much about usb but I think devices have some way of telling the OS what it is so that the drivers can be loaded, correct? If so is there a way of checking in C# what port my device is on.

thaks alot

Thanks Ryan for your reply. I was wondering Ryan, can u help me with commands that can enable me communicate with modems connected to a landline and a pc?. Actually, what i want to do is develop an application, that can detect when calls are made and record it and also be able to note the time spent in making that call and also to record missed calls and others. I would really appreciate any help given me. Thanks in advance.

Ryan, is there a generic command that can be used to force a device to send data back to an application like u used the "SI\r\n" to obtain info from the scale?

In our Web Based POS we have multiple devices on different ports. Some are attached with USB ports and some are from COM ports. How can we manage all those using C#. What I am thinking to write a C# component and install at Client PC and call methds of the component using JavaScript. Any Help will be appreciated..!!

I am trying to access my compass device. It take a 0x11 single byte command. I have modified the write portion to accomodate this: byte[] buffer_2_send = new byte[1]; byte data_2_send = 0x11; buffer_2_send[0] = data_2_send; _serialPort.Write(buffer_2_send, 0, buffer_2_send.Length);//; It gets to the sp_DataReceived buts then errors out at the following line: string data = _serialPort.ReadLine(); It is supposed to reply with the following data but instead errors out 3 times with: Error opening/writing to serial port :: The operation has timed out. reply: 9 bytes 0: degree high (unsigned 16bit) 1: degree low 2: minute (unsigned 8bit) 3: temperature high (status bit + 7bit) 4: temperature low (sign bit + 7bit) 5: inclination Y (sign bit + 7bit abs) 6: inclination X (sign bit + 7bit abs) 7: status 8: checksum Any ideas?? Mark

I am new to serial port, USB & hardward type. What is the best way (code wise ) to scan for the serial ports available on a given system. Thank you

This code was used to connect to a floor scale. The customer that I wrote the code for would move a pallet onto the scale, and I would send the "SI\r\n" command to the scale so that it would return the weight. I also use this code to receive data from a serial port barcode scanner(without the "Write" method). When a barcode scanner scans, it sends the data through the serial port, and my application will display the scanned information on the textbox.

Hi dude, As i dont have knowledge about usage of serial ports , can I know the scenario where to use such serial ports as you mentioned here that reading data from serial ports?