Simple Serial Port Monitor is, as the name says, simple serial port monitoring tool. User interface is clear and extremely easy to use. As one of it's handly. Serial Port Programming using Win32 API. Now let's write a small program to open and close a serial port on Windows. Original design by Simple Themes. I am a little bit confused about reading and writing to a serial port. Read, and write from serial port in C. I thought itd be simple to open and read/write. Termite: a simple RS232 terminal. The interface of the Termite program has one large. If using the device name of a serial port is not an option.