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IOGEAR - GHSW8141 - 4-Port HDMI Audio/Video Switch with RS-232 Support
ATEN 4-Port True 4K HDMI Switch - Walmart.com
Amazon.com: TESmart 4K UHD 16 Ports HDMI KVM Switch, Console Rack Mount Switch with 8 Pcs 5ft KVM Cable, USB 2.0 Device 16 Port Inputs, Control up to 16 Computers/Servers, with RS232
Control an RS232 HDMI Switch - Raspberry Pi Forums