The UNO-220 Raspberry Pi-ready industrial-grade gateway kit is designed for users of Raspberry Pi single-board computers (SBCs) for developing unique IoT applications. Featuring a micro SD card with OS image and Raspberry Pi HAT I/O board, the industrial-grade chassis transforms Raspberry Pi 4 into an intelligent gateway equipped with additional RS-232/-485 GPIO and an RTC battery for maintaining accurate time. Although the kit is delivered without a Raspberry Pi SBC, the prefinished mounting holes and accompanying attachment screws ensure easy assembly without necessitating special tools or technical expertise. It is equipped with Raspbian OS and built-in drivers and supports wall and DIN-rail mounting for flexible installation.