Using com port with

I’m attempting to communicate to my Epson projector via a serial port wired to my raspberry pi3. Unfortunately this projector doesn’t have an ethernet port… only a RS-232C port for communication.

All I really want to do is turn the projector on and off but I’m am getting nowhere. Can someone point me in the right direction. So far nothing I’ve read about on-line works.

As for my system, I’m using The RX and TX lines are crossed. I can enter dmesg | grep tty via a command line and it tells me my port is ttyAMA0. I think this means that there is some level of recognition of the COM port?

Thanks so much for your time!