General description The 3X 4-Way Modbus RTU Relay Module is designed for versatile control applications, featuring a stable MCU and MAX485 level conversion chip. It supports the standard Modbus RTU protocol and offers both RS485 and TTL UART communication interfaces. This module is equipped with four relays capable of handling significant loads, making it ideal for various automation tasks. Technical specifications Power supply voltage: DC7-24V Communication baud rate: 4800/9600/19200 (default 9600) Optocoupler input signal range: DC3.3-30V Relay output: 10A/250V AC, 10A/30V DC Relay activation lifespan: 100,000 cycles Device address range: 1 to 255 (default 255) Relay switching signal modes: manual, flash, and flash delay (0.1s to 6553.5s) Compatibility and accessories Supports 5.08mm DC jack/power terminal Other information Onboard relay switching indicator light Package Contents: 3 x Relay Module Measurement allowed error: +/- 1-3 cm Note: Light reflection and different displays