From Makers Electronics's description
MAX485 TTL To RS485 Converter Module MAX485 TTL To RS485 Converter Module is used to connect your microcontroller to a network that spans over a kilometer, even in noisy environments. The MAX485 TTL to RS485 Converter Module makes this possible by enabling seamless communication between TTL-level devices (like Arduino, Raspberry Pi, or other microcontrollers) and RS485 networks. Powered by the MAX485 transceiver chip, this module offers robust, long-distance serial communication with low power consumption. Its compact design and compatibility with both 3.3V and 5V logic levels make it a versatile choice for a wide range of applications. Features: Long-distance communication: Transmit data up to 1.2km (4000ft), depending on data rate and environment. Noise immunity: Uses differential signaling to ensure reliable data transfer in industrial or electrically noisy settings. Multi-device networks: Connect up to 32 devices on a single RS485 bus for efficient communication. Ease of integration: Breadboard-friendly with clearly labeled pins for quick setup. Supports data rates up to 2.5Mbps for fast communication. Compatible with 3.3V and 5V logic levels, ensuring versatility across microcontrollers. Half-duplex communication enables bidirectional data transfer on a single bus. Built-in 120-Ohm termination resistor for proper RS485 bus termination. Low power consumption (120µA to 500µA quiescent current) for energy-efficient designs. Breadboard-friendly design with standard 0.1″ pin spacing for easy prototyping. Includes indicators for power and data transmission (on some variants). Protection features: Current-limiting, thermal shutdown, and receiver fail-safe for enhanced reliability. Specifications: Specification Details Chipset MAX485 TTL To RS485 Operating Voltage 3.3V to 5V DC Data Rate Up to 2.5Mbps Maximum Distance Up to 1.2km (4000ft) Number of Devices Up to 32 on the RS485 bus Pins RO, RE, DE, DI, GND, VCC, A, B Dimensions 45mm x 15mm x 14mm Weight 4g Protection Features Short-circuit current limiting, thermal shutdown, receiver fail-safe Termination Built-in 120-Ohm resistor network Communication Type Half-duplex Additional Features Power and Data Transmission LEDs Pinout: Pin Name Description RO RX Pin(GPIO15). RE Transmit pin (GPIO23). DE Transmit pin (GPIO23). DI TX Pin (GPIO14). GND Ground connection. VCC Power supply (5V). A To next MAX485 (A). B To next MAX485 (B). Applications: Industrial Automation: Facilitates communication in control systems, PLCs, and SCADA setups. Building Automation: Powers HVAC, lighting control, and security system networks. IoT and Sensor Networks: Enables remote sensor data collection and monitoring over long distances. Long-Distance Serial Communication: Connects devices separated by significant distances. Multi-Drop Networks: Supports communication between multiple devices on a single bus. Robotics and Embedded Systems: Interfaces microcontrollers with RS485-compatible devices. Package Included: 1x MAX485 TTL To RS485 Converter Module.
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