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