The WIN-IO-4DIM is a 4-Port Digital Input Module supporting 3–40V DC detection as well as potential-free input detection using an internal 12V DC reference. It communicates via Modbus RTU over RS485, ensuring easy integration with PLC, SCADA, BMS, and industrial control systems. Powered by 12–24V DC, the module offers reliable, noise-resistant digital signal acquisition for automation and monitoring applications.