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I want to write an app that receive data from RS232(sometimes using usb connector) port using C/C#.
I have searched the web but found nothing. Do u have anything interesting? Articles, tutorials, tips, code snippets, everything is very much appreciated.
I have got transmission protocol, but have no idea how to read data from rs232.
Can I read/write data asynchronously?
Take a look at this really great tutorial: http://www.codeproject.com/Articles/8605/Serial-Communication-using-C-and-Whidbey . It offers not only a whole small project but it also explains the basics of serial communication.
As for the USB-to-Serial-connector or real RS232 – it doesn’t really matter because Windows recognizes both as a COM port. If you open your Device manager, in the Ports(COM & LPT) section you will be able to see both.