• C Read From Serial Port Rx
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If you pass a 1024 character buffer, for example, and five characters were already read from the serial port read will return 5, to indicate that accordingly. If no characters have been read, and you opened the serial port as a blocking device, read will block at least until one character has been read from the serial port, and then return. Hello, I hope you are having a good day and I emphatically appreciate your help. Can someone please point me to a forum/website that explains, in depth, how to open and read a COM serial port (RS232) in C. Use this method for reading characters from the serial port. If it is necessary to switch between reading text and reading binary data from the stream, select a protocol that carefully defines the boundary between text and binary data, such as manually reading bytes and decoding the data. I have done serial port RS-232 connection in C using 16-bit compiler (I was using Turbo C IDE). It included header file bios.h which contain all the required functions for reading values from the.

I just start to learn how to send and receive data from my hardware through the C# GUI.

Can anyone please write a detail how to read data from the serial port?

Lundin

3 Answers

SerialPort (RS-232 Serial COM Port) in C# .NET
This article explains how to use the SerialPort class in .NET to read and write data, determine what serial ports are available on your machine, and how to send files. It even covers the pin assignments on the port itself.

Example Code:

Cristian CiupituRobert HarveyRobert Harvey

I spent a lot of time to use SerialPort class and has concluded to use SerialPort.BaseStream class instead. You can see source code: SerialPort-source and SerialPort.BaseStream-source for deep understanding.I created and use code that shown below.

• The core functionpublic int Recv(byte[] buffer, int maxLen)has name and works like 'well known' socket's recv().

• It means that

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  • in one hand it has timeout for no any data and throws TimeoutException.
  • In other hand, when any data has received,
    • it receives data either until maxLen bytes
    • or short timeout (theoretical 6 ms) in UART data flow

.

Note that usage of a SerialPort.DataReceived event is optional. You can set proper timeout using SerialPort.ReadTimeout and continuously call SerialPort.Read() after you wrote something to a port until you get a full response.

Moreover you can use SerialPort.BaseStream property to extract an underlying Stream instance. The benefit of using a Stream is that you can easily utilize various decorators with it:

For more information check:

• Top 5 SerialPort Tips article by Kim Hamilton, BCL Team Blog
• C# await event and timeout in serial port communication discussion on StackOverflow

C Read From Serial Port Rx

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Read String From Serial Port C

Leonid Vasilev

C Read From Serial Port Angeles