MAX485 TTL to RS-485 Converter Module
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৳ 2,300.00৳ 2,500.00 (-8%)
The MAX485 TTL to RS-485 Transceiver Module is a compact, high-performance solution designed to convert standard TTL serial data into rugged, industrial-grade RS-485 differential signals. Operating at 5V DC, this low-power module enables microcontrollers (like Arduino, ESP32, and Raspberry Pi) to achieve reliable, half-duplex communication over long distances up to 1,200 meters (4,000 feet) at speeds up to 2.5 Mbps. Featuring high noise immunity, multi-drop networking support for up to 32 nodes, an on-board 120Ω termination resistor, and a built-in power LED, it is perfect for Modbus RTU communication, long-distance telemetry, PLC interfacing, and automated building networks.
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MAX485 TTL to RS-485 Serial Transceiver Module
Product Overview
The MAX485 TTL to RS-485 Transceiver Module is a high-performance, low-power hardware solution designed to bridge the gap between microcontrollers and industrial network environments. Operating on a 5V DC supply, this board effortlessly converts single-ended standard TTL UART serial signals (from platforms like Arduino, ESP32, STM32, or Raspberry Pi) into balanced, differential RS-485 signaling.
By utilizing differential data lines, this module delivers exceptional resistance to electrical noise, magnetic interference, and signal attenuation. It enables reliable, half-duplex data transmission across extended distances up to 1,200 meters (4,000 feet) at speeds reaching 2.5 Mbps, making it an essential tool for robust field networks.
MAX485 TTL to RS-485 Converter Module
Technical Specifications
- On-Board Transceiver IC: Maxim Integrated MAX485 (Low-power slew-rate-limited transceiver)
- Operating Voltage: 4.75V to 5.25V DC (5V Nominal)
- Maximum Data Rate: Up to 2.5 Mbps
- Max Device Node Capacity: Allows up to 32 transceivers connected concurrently on a single multi-drop bus line
- Bus Termination: Integrated on-board 120-Ohm (Ω) impedance matching resistor (R₇) to eliminate transmission echoes and signal reflection
- Indicator System: On-board Power LED (D₁) provides immediate visual diagnostic of electrical connectivity
- Module Dimensions: Extremely compact footprint (~44mm x 14mm) for seamless integration into enclosure housing or crowded prototype breadboards
MAX485 TTL to RS-485 Converter Module
Pin Configuration & Interfacing
Microcontroller Interface (2.54mm Pitch Header)
- VCC: 5V Power Supply Input
- GND: Ground Reference Line
- RO (Receiver Output): Connects directly to the Microcontroller’s Hardware/Software UART RX pin. Output signal of the RS-485 network.
- DI (Driver Input): Connects directly to the Microcontroller’s Hardware/Software UART TX pin. Input signal sent onto the RS-485 network.
- RE (Receiver Enable): Active-Low control pin. Pull LOW to put the module into receiving mode.
- DE (Driver Enable): Active-High control pin. Pull HIGH to put the module into transmitting mode.
(Tip: In typical half-duplex setups, RE and DE are jumped together to a single microcontroller digital pin to toggle between read and write modes with a single line).
Field Bus Interface (5mm Green Terminal Block)
- A Terminal: Non-Inverting Receiver Input / Driver Output
- B Terminal: Inverting Receiver Input / Driver Output
- GND Pad: Multi-drop bus signal reference ground pad to mitigate serious ground-potential offset errors across massive distances
MAX485 TTL to RS-485 Converter Module
Key Features & Applications
Industrial-Grade Immunity
The balanced differential architecture inherently rejects common-mode noise and ground loops. This makes it perfect for hostile electrical environments with heavy machinery or long cabling paths.
Integrated Fail-Safe & Bias Circuits
Equipped with onboard R₅ and R₆ pull-up/pull-down biasing networks, ensuring that the receiver maintains a predictable, stable logic-high state when the entire communication bus is idling or disconnected.
Common Application Use-Cases
- Modbus RTU Networks: Interfacing microcontrollers with industrial PLCs, climate sensors, power meters, and variable frequency drives (VFDs).
- Long-Distance Telemetry: Gathering remote data from weather stations, solar arrays, or agricultural sensors miles away.
- PTZ Camera Controls: Long-range CCTV Pelco-D telemetry and control command lines.
- Building Automation: Networked HVAC setups, access control readers, and automated lighting infrastructure.
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