MTTTY.ZIP is a single EXE program that allows you to type or send a file thru a PC's serial port. You can see received characters or capture them to a file. It allows you to select parity, baud rate, and some other serial port configuration aspects. It will also show any errors that occur, and what kind they are.
It lets you pick:
and several other things.
Download, unZip somewhere, and run it.
Click filename below to access file