Need USB PC input device

Looking for something that i can plug into server USB for dry contact input so NodeRed can control. I know that a RPi can be used, but I'm looking for something more robust 24/7

Does it have to be USB? An ethernet based relay would be better IMO.

Something with modbus/tcp interface is directly communicable from node-red.

If you want 24/7 and robust, you might want to consider a small PLC with built in IO. Something like the RS-PRO Mini PLC : Controlling lighting using RS Pro Logic / Genie NX | njh

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