2-Channel Isolated RS485 Expansion HAT for Raspberry Pi

SKU 17221

Download 2-CH Isolated RS485 Expansion HAT User Guide and Resources

Introducing the 2-Channel Isolated RS485 Expansion HAT for Raspberry Pi - a powerful and versatile tool for your industrial automation needs.

With its stable and reliable SC16IS752+SP3485 solution, embedded protection circuits, and fast data transfer capabilities, this expansion HAT is the perfect choice for any application that requires high-speed communication with the utmost safety and security.


  • 2-channel isolated RS485 expansion HAT designed for Raspberry Pi
  • Adopts SC16IS752+SP3485 solution for stable and reliable communication
  • Built-in power supply isolation, ADI magnetic isolation, and TVS diode protection circuits for added safety
  • Easy control of 2-channel RS485 auto transceiving via SPI interface
  • Ideal for industrial automation applications
  • Standard Raspberry Pi 40PIN GPIO extension header supports Raspberry Pi series boards
  • SC16IS752+SP3485 dual chip combination converts SPI to RS485, data rate up to 921600bps
  • Allows transceiving data manually or automatically, configured by DIP switch
  • Onboard TVS (Transient Voltage Suppressor) for surge and transient spike voltage suppression, lightningproof & anti-electrostatic
  • Onboard resettable fuse and protection diodes for current/voltage stability and over-current/over-voltage proof, improved shock resistance
  • Onboard LEDs for indicating power and transceiver status
  • Breakout SPI control pins for connecting with host control boards like Arduino
  • Comes with online development resources and manual (examples in C and Python)


  • UART Expansion Chip: SC16IS752
  • RS485 Transceiver: SP3485
  • Communication Interface: SPI
  • Data Rate: 300 ~ 921600 bps
  • Operating Voltage: 3.3V / 5V
  • Dimensions: 65.0 × 56.5mm
  • Mounting Hole Size: 3.0mm

Possible Applications

  • Industrial automation
  • Building automation
  • Smart home systems
  • Environmental monitoring
  • Robotics and control systems

The 2-Channel Isolated RS485 Expansion HAT for Raspberry Pi is a versatile and reliable tool that can help you achieve your automation goals. With its powerful features and flexible design, it's the perfect choice for any project that requires fast and secure communication.

Standard Raspberry Pi 40PIN GPIO Header

Board Components

  1. UART Expansion Chip SC161S752
  2. Digital Isolator ADUM1412
  3. Optocoupler PC817
  4. RS485 Transceiver SP3485
  5. Power Supply Isolation Module B0505LS
  6. Power Chip RT9193-33
  7. Transient Suppress Diode Array SMAJ12CA
  8. Resettable Fuse
  9. Status Indicator (PWR, RXD/TXD – UART)
  10. GPIO Header
  11. RS485 Terminal
  12. MCU Control Header for Host Boards
  13. Terminal Resistor Switch 120Ω
  14. Interrupt Pin Switch
  15. Operating Mode Selection (Half-Auto: A=0, B=1 | Full-Auto: A=1, B=0)

Pin Definition

Items Included

  • 2-Channel RS485 HAT
  • Female Pin Header 2x20PIN
  • Pack of Screws

Package Weight: 29 Grams

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