Dual-channel RS485 Expansion Hat for Raspberry Pi 4B
91 units available with a short lead time.
A dual-channel RS485 expansion HAT for Raspberry Pi that provides electrically isolated RS485 communication with built-in protection against lightning, surges, and transient voltage spikes. Each channel uses an isolated transceiver for reliable, interference-resistant data transmission — ideal for industrial IoT, environmental monitoring, and building automation systems.
The HAT uses the CH432T serial chip and TP75176E RS485 transceivers, with 120Ω terminal resistors and 5.08-3P pluggable terminal blocks for easy wiring. TX and RX indicator LEDs show communication activity in real time. Includes mounting hardware for secure attachment to your Raspberry Pi.
Key Features
- Dual RS485 Channels – Two independent, isolated RS485 communication interfaces
- Electrical & Signal Isolation – Isolated transceivers for reliable, noise-resistant data transfer
- Lightning & Surge Protection – Built-in protection circuits including TVS diode
- TX/RX Indicator LEDs – Blue (TX) and green (RX) for real-time communication status
- 120Ω Terminal Resistors – Included on each channel for proper bus termination
- Pluggable Terminal Blocks – 5.08-3P connectors for tool-free wiring
- Modbus Ready – Supports Modbus master/slave protocol over RS485
Ideal For
- Agricultural and warehouse IoT systems
- Indoor and outdoor environmental monitoring
- Lighting control and building automation
- Security and access control systems
- Industrial sensor networks using Modbus protocol
Specifications
- Operating Voltage – 3.3V
- RS485 Transceiver – TP75176E
- Serial Chip – CH432T
- RS485 Channels – 2
- Terminal Resistance – 2× 120Ω
- Wiring – 5.08-3P pluggable terminal blocks
- LEDs – Power (red), TX (blue), RX (green)
- Compatibility – Raspberry Pi 3B+, 4B
- Mounting Holes – 2.5mm diameter
- Dimensions – 56 × 65mm
Package Contents
- 1× Dual-Channel RS485 Expansion HAT
- 4× Copper Standoffs & Screws
Resources
The Dual-channel RS485 Expansion Hat for Raspberry Pi 4B appears in the following collections:
