4K HDMI with RS 232 data over Optic Fiber Extender – Transwan
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Gefen HDMI 1.3 4X1 Switcher with RS232 - GTV-HD-1.3-441N
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HDMI® HDBaseT + RS232 and IR over Cat Extender Box Transmitter to Box Receiver (18Gbps) - 4K 60Hz | HDBaseT Extenders | HDBaseT | Audio Video
TV One 1T-CT-653 HDMI over CAT5e/6 with LAN/RS232 1T-CT-653 B&H