1、Electrical Controller Device: 1 channel relay module is a kind of electric appliance that makes a predetermined step change of the controlled quantity in the electric output circuit when the change of the input quantity (excitation quantity) reaches the specified requirement. 2、Automation and Safety: Typically used in automated control circuits, this relay board is pretty much an automatic switch, controlling large currents with minor ones. It plays a significant role in automatic adjustment, safety guard, and circuit conversion, providing more convenience and security. 3、Interactive Function: This module has an interactive relationship between the control system (also known as input circuit) and controlled system (or output circuit). It forms a responsive unit that works in an interlinked manner for better functionality. 4、Stable and Reliable Configuration: This relay module with optocoupler is equipped with a robust and stable 8 bit MCU and RS485 protocol chip, ensuring longevity and unwavering performance. 5、Standard Protocol: Adopting the standard for RTU format of the RS485 protocol, this relay switch can achieve 1 way input signal detection and 1 way relay output. It's ideal for digital quantity detection or power control situations. Item Type: Relay Module Material: PCB Power Supply Voltage: 5-32V Protocol: Support for RTU standard protocol Interface: Support RS485 interface Baud Rate: 4800 9600 19200, default 9600bps, supports power off memory Output Signal: Relay switch signal Device Address: Range 1-255, default 255, supports power off memory 1 x Relay Module