4K HDMI with RS 232 data over Optic Fiber Extender – Transwan
TV One 1T-CT-653 HDMI over CAT5e/6 with LAN/RS232 1T-CT-653 B&H
Amazon.com: SIIG 4K HDR HDMI 2.0 HDBaseT Extender Over Single Cat5e/6 with RS-232 & IR - 330ft (100m) @ 1080p & 3840x2160@60Hz YUV 4:4:4 8bit, RS232, HDMI 2.0 and HDCP 2.2, HDR,
Amazon.com: KVM Switch with Serial Port Control, 4K@60Hz 4 in 1 Out HDMI KVM Switcher Box for Share Mouse Keyboard and Monitor, Can Work with Pi-kvm, Compatible with Windows/Linux/Mac System : Electronics
MIARHB Conductor-male RS232 To Straight Copper Serial DB9 Female Cable Through HDMI cable HDMI - Walmart.com
HDMI over Cat5e Video Extender w/ RS232 - HDMI® Extenders | Audio-Video Products | StarTech.com
ROBOfiber RB-4KHDMI-T 4K HDMI over fiber transmitter single strand with RS232 channel transport
4K HDMI 2.0 HDBaseT Weatherproof Receiver With HDCP 2.3, POH, and 2-Way IR RS232 Control