The TTL To RS485 Module is an isolated converter that translates TTL level UART signals to an RS485 differential bus.Designed as a singlechip, industrialgrade solution, it provides galvanic isolation between the TTL serial port and the RS485 network and operates from a 3 V to 5.5 V supply. This module is built to be a reliable interface for microcontrollers and industrial devices that communicate over RS485. Key benefits Protects your microcontroller and system from transients and ground loops thanks to galvanic isolation between the TTL side and the RS485 bus. Enables easy connection between TTL UART devices (3 V to 5.5 V logic) and RS485 networks without additional drivers. Compact, singlechip design simplifies integration into development boards, industrial controllers, and embedded systems. Suitable for industrial environments where robust, longdistance serial communication is required. Key attributes Functionality: TTL to RS485 conversion with isolated interface, using a singlechip solution for compact, reliable operation. Compatibility: Works with TTL level UART hosts and RS485 networks. Operates with a supply range of 3 V to 5.5 V. Interfaces: TTL side: UART serial port for connection to microcontrollers (TX, RX, GND) RS485 side: A and B differential bus lines for RS485 communication Isolation: galvanic isolation between TTL UART host and RS485 network to improve safety and noise immunity Application domain: Industrialgrade module designed for use in environments where durable, dependable serial communication is required Form factor: Module/adapter designed for easy integration into projects and equipment Use cases Industrial automation and control: Connect a microcontroller or PLC to multiple RS485 sensors and actuators across a factory floor while protecting the controller from electrical noise and ground differences. Microcontroller projects: Interface Arduino, STM32, ESP32, or other UARTenabled controllers with RS485 devices such as Modbus sensors, motor controllers, or remote I/O modules. Building and facility automation: Link environmental sensors, lighting controls, or HVAC controllers that reside on an RS485 network to a central controller via TTL UART. Typical usage and connection notes TTL side connection: Connect your microcontroller's TX to the module's RX input, and the microcontroller's RX to the module's TX output, with a common ground. RS485 side connection: Attach the RS485 A and B lines to the corresponding differential bus wires of the RS485 network. Power: Supply the module with a 3 V to 5.5 V supply within the specified range. Polarity and bus setup: Observe correct A/B polarity on the RS485 bus and ensure the bus is terminated appropriately for the network length and speed as required by your system. The TTL To RS485 Module provides a straightforward, robust bridge between TTL UART devices and RS485 networks, combining a compact, singlechip design with galvanic isolation and industrialgrade reliability. It is suitable for developers and engineers who need a dependable, isolated TTLtoRS485 interface for serial communications in modern embedded and automation projects.