Kramer 4K UHD HDMI, Ethernet, Bidirectional RS232, and TP-780TXR
Amazon.com: StarTech.com 330 ft. (100 m) HDMI Over CAT5e / CAT6 HDbaseT Extender - UHD 4K - IR Extension - RS232 Extension - Power Over Ethernet (ST121UTPHD2) : Electronics
Amazon.com: TESmart 8 Port HDMI KVM Switch 4K @ 30Hz with Standard USB 2.0, IR Remote Control | RS232 | LAN Port | Auto-Scan, etc with Rack Mount 4 Pcs 5ft/1.5m KVM Cable : Electronics
Multiport adapter for creditcard terminal VeriFone Vx680 USB+RS232 mini HDMI 19
HDMI Switch 16 Port 4K 60Hz Auto Switch With RS232/LAN-TESmart
4k Rs232 Hdmi To Fiber Optic Extender Video Audio Hdmi Kvm Transmitter And Receiver 10km - Transmission & Cables - AliExpress
HDMI Over IP RS232/IP Control Box for DigitalinxIP 2000 & 5000 series products - Pro AV Warehouse
us seller NEW HDMI TO DB9 SERIAL VGA RS232 9-PIN ADAPTER CABLE LEAD. Getwiredusa | eBay
UHD 4K 115 ft (35M) / HDMI 1080p 196 ft (60M) over CAT5e/6/7 5V Non-PoC Receiver w/ 1-Way IR Return & RS-232 | A-NeuVideo, Inc.
HDMI KVM switch 16 port 4K60Hz Autoscan, Rackmount, RS232 TESmart
4K 70M HDMI Extender with RS232 Extension, HDBaseT PoC, EVBMS-M107
8 Port HDMI Switch 4K Rackmount,RS232/LAN, HDCP-TESmart
Amazon.com: 1080P HDMI KVM Fiber Extender Video Resolution Up to 2K@60Hz HDMI to Fiber Converter Transmission Distance Up to 20km 4.25Gbps Support USB Mouse Keyboard RS232 GPIO Signal Bidirectional Stereo Audio :
4K HDMI with RS 232 data over Optic Fiber Extender – Transwan
Pro AV/IT HDBaseT™ 4K60 18G HDMI Extender Kit with Audio, RS232, IR, PoC up to 492ft
4x1 Switcher for HDMI with RS232 | Gefen
HDBaseT Extender| 4k HDMI over Ethernet RS232 IR Transmitter and Receiver | DDMALL
Source POLYCOM Eagle Eye HDMI/RS232 to HDCI converter on m.alibaba.com
Cardinal DVM DVM-HDBT-EX07 HDMI + IR + RS232 HD-Base-T Extender Set (70m) | Infra-Supply.com