1. Configurable device address (1 255). Multiple devices can be cascaded on the RS485 bus. Features flash on and flash off functions: by passing an argument to the command, you can turn the relay on for a set duration and then automatically close it. 2. Onboard unibody power supply isolation provides a stable isolated voltage and requires no extra power supply for the isolated terminal. Onboard unibody magnetical isolation enables signal isolation with reliability, strong anti interference, and low power consumption. 3. Onboard resettable fuse and TVS (Transient Voltage Suppressor) effectively suppress surge voltage and transient spikes in the circuit, providing over current and over voltage protection, lightning protection and anti electrostatic. Onboard optocoupler isolation prevents the relay from being interfered by the voltage circuit. 4. Adopts dedicated relay driver chip with built in flyback diode protection for stronger and more stable driving capability. Supports passive and active digital input, with bi directional optocoupler isolation and built in debouncing algorithm. The relay supports digital input linkage control or toggle control. Applications and use scenarios Industrial automation and control networks: cascade multiple devices on an RS485 bus for centralized relay control; use the flash on/flash off function to implement timed switching sequences and safe power down routines with isolation for robustness in harsh environments. Building management and safety systems: isolated control signals from voltage equipment enable reliable remote control of relays for HVAC, lighting, or security subsystems while minimizing interference and protecting control electronics. Laboratory, test benches, and instrumentation: clean digital inputs with debouncing and optocoupler isolation reduce signal noise and interference; support for both passive and active inputs and for digital input linkage or toggle control improves test setup flexibility.