General description The 2X 4-Way Modbus RTU Relay Module is designed for efficient control and automation, featuring a stable MCU and MAX485 level conversion chip. This module supports the standard Modbus RTU protocol and offers both RS485 and TTL UART communication interfaces. With its robust design, it includes anti-reverse protection to ensure reliable operation. Technical specifications Supply voltage: DC 7-24V Communication baud rate: 4800/9600/19200 (default 9600) Optocoupler input signal range: DC 3.3-30V Relay specifications: 4 channels, 5V, 10A/250V AC, 10A/30V DC Relay activation lifespan: 100,000 times Device address range: 1 to 255 (default 255) Flash/flash delay base: 0.1s, longest time can be set to 6553.5s Measurement allowed error: +/- 1-3 cm Compatibility and accessories Supports 5.08mm DC jack/power terminal Usage Can be used for manual control, flash, and flash mode switching Input signal, relay status, and device address can be set via software/command Other