Amazon.com: 4K Video Wall Controller, 5 in 9 Out RS232 Control 100‑240V HD Multimedia Interface TV Wall Processor for PC for Projector (US Plug) : Industrial & Scientific
Trying to control sony projector via putty on windows computer through usb -> rs232 adapter, having trouble : r/CommercialAV
gpio - Serial (RS232) Controled Projector - Raspberry Pi Stack Exchange
8 BUTTON RS232/IR CONTROL PANEL – THE SIGNAGE DEPOT
Serial RS232 Projector Cable - ViewSonic compatible | Serial RS232 | Computer Cables | USB and PC