Data gets corrupted during transmission over the serial port

Question

I am developing a program to communicate with an old system. I use System.IO.Ports.SerialPort for this. The problem is when I send a longer message, the message bevome corrupt.

Answer 1

My guess is that messageStr is a string, and you're seeing encoding issues. You've explicitly specified the UTF-8 encoding, so that's what you're getting - but I suspect it's not what you really want.

You've shown binary data, so I assume you actually want to send exactly that binary data - in which case you should use the Write(byte[], int, int) overload.

If you really want to write text data, you probably just need to pick the right encoding - but you'll need to give us more information for us to help you make the right choice.