DIYables MAX485 TTL UART to RS485 Transceiver Module 5V Serial Adapter Lightning Protection for Arduino ESP32 ESP8266 SCM Development Board
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Quick Overview
The DIYables MAX485 Module converts TTL UART serial signals to RS485 differential signals using the MAX485 chip, enabling reliable long-distance communication for industrial and embedded applications. The module features an industrial-grade imported chip with an enhanced RS485 lightning protection design and superior anti-interference capability, making it robust in electrically noisy environments. A 5.08mm pitch 2P screw terminal provides secure connection to the RS485 bus.
Operating at 5V, the MAX485 is a half-duplex, slew-rate-limited transceiver that minimizes EMI and keeps power consumption low. All MAX485 pins — DI, DE, RE, and RO — are fully exposed and can be controlled directly through microcontroller GPIO, giving full programmatic control over transmit/receive direction switching. The compact 44mm x 14mm PCB fits easily into enclosures and control panels.
Ideal for Modbus RTU communication, RS485 multi-drop networks, SCADA systems, PLC interfacing, remote device control, and any application requiring TTL-to-RS485 signal conversion with Arduino, ESP32, ESP8266, or other SCM development boards.
Key Features
- MAX485 RS485 Transceiver — MAX485 chip converts TTL UART signals to RS485 differential signals for reliable long-distance industrial serial communication
- Lightning Protection Design — Industrial-grade chip with enhanced RS485 lightning protection circuitry and strong anti-interference capability for harsh environments
- Low Power Slew-Rate Limited — MAX485 limits the output slew rate to reduce EMI emissions and lower power consumption in embedded and battery-powered systems
- 5.08mm Pitch Screw Terminals — Secure 5.08mm pitch 2P terminals for reliable RS485 A and B bus wiring without soldering
- Full Pin Access — All MAX485 pins (DI, DE, RE, RO) are exposed for complete microcontroller GPIO control over transmit and receive direction
- Half-Duplex Operation — Half-duplex RS485 communication allows up to 32 nodes on a single RS485 bus for multi-device networking
- 5V Operation — Compatible with 5V microcontroller systems including Arduino, SCM boards, and 5V logic platforms
- Compact 44mm x 14mm PCB — Small form factor fits easily in enclosures, DIN rail setups, and tight control panel spaces
- 5 Pack Value — Includes 5 transceiver modules for multi-node RS485 networks, redundant installations, or prototyping spares
- Versatile Applications — Suitable for Modbus RTU, RS485 multi-drop networks, SCADA, PLC interfacing, and remote serial device control
SPECIFICATION
| Specification | Value |
|---|---|
| Product Type | TTL UART to RS485 Transceiver Module |
| Chip | MAX485 |
| Communication Mode | Half-duplex RS485 |
| Operating Voltage | 5V DC |
| TTL Side Pins | DI (Data In), DE (Driver Enable), RE (Receiver Enable), RO (Receiver Out) |
| RS485 Bus Terminals | A, B (5.08mm pitch 2P screw terminal) |
| Slew Rate | Limited (reduced EMI) |
| Lightning Protection | Yes (industrial-grade RS485 protection) |
| Max Bus Nodes | 32 devices |
| PCB Dimensions | 44.1mm × 13.8mm |
| Package Quantity | 5 pieces |
| Compatibility | Arduino, ESP32, ESP8266, SCM boards, PLC, AVR, ARM |
| Applications | Modbus RTU, RS485 network, SCADA, PLC interfacing, remote serial control, industrial automation |
PACKAGE
A package includes:
| Qty | Items |
|---|---|
| 5 | MAX485 TTL UART to RS485 Transceiver Module |
COMPATIBLE HARDWARE
- Arduino boards (UNO, Mega, Nano, etc.) — 5V UART TX/RX with DE/RE GPIO control
- Arduino Uno R4 WiFi/Minima — UART serial with GPIO direction control
- ESP32 development boards — UART2 or any hardware UART with GPIO DE/RE control
- ESP8266 boards (NodeMCU, Wemos D1, etc.) — software or hardware UART with direction control
- Raspberry Pi (all models) — UART serial with GPIO DE/RE switching
- PLC RS485 ports and Modbus masters — standard RS485 A/B bus connection
- SCM (single-chip microcomputer) development boards — full TTL UART integration
- RS485 Modbus slaves and sensors — multi-drop RS485 network nodes
- Any 5V microcontroller with UART and GPIO — TTL to RS485 signal conversion
