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USB IO Hardware
Amazon.com: Electronics123.com, Inc. USB/RS485 I/O Controller (Relayduino) : Electronics
Power I/O module, digital analog and USB interface. Xon Electronics - Dispositivi e componenti elettronici elettrici meccanici per automazione e industria
Usb Serial Port Relay | Usb Relay Module 8ch | Rs232 Relay Board | Linux Relay Board - Dc - Aliexpress
I/O Module for industrial and automotive computer systems
PCIe TO USB 3.2 Gen1 Adapter, Designed For Raspberry Pi Compute Module 4 IO Board, 4x High Speed USB Ports | PCIe TO USB 3.2 Gen1 (B)
2PCS DC 12V 24V 8ch IO Digital Collector USB COM Serial Port UART Relay Module | eBay