Waveshare 2-Channel Isolated RS485 Expansion HAT for Raspberry Pi


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Approx Restocking Date: 25 to 30 Days
SKU: 968473
  1. UART expansion chip: SC16IS752
  2. RS485 transceiver: SP3485
  3. Communication interface: SPI
  4. Data rate: 300 ~ 921600 bps
  5. Operating voltage: 3.3V / 5V
  6. Mounting hole size: 3.0mm


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Category: Raspberry Pi Hats
Tags: RS485, Waveshare, Expansion HAT, 2-Channel HAT, RS485 Expansion HAT

This is a Waveshare 2-Channel Isolated RS485 Expansion HAT for Raspberry Pi.

This  dual-channel isolated RS485 extension board specially designed for raspberry PI, which adopts SC16IS752+SP3485 solution embeds with protection circuits such as power supply isolation, ADI magnetical isolation, and TVS diode, etc.

This product adopts SC16IS752 as a controller. SC16IS752 is a dual-channel high-performance UART expansion chip that supports SPI and I2C interface communication. This module uses an SPI interface.

Useful link:

To do Hardware and Software setup, please follow this tutorial.

What’s on Board:

Waveshare 2-Channel Isolated Rs485 Expansion Hat For Raspberry Pi

  1. SC16IS752 UART expansion chip
  2. ADUM1412 digital isolator
  3. PC817 optocoupler
  4. SP3485 RS485 transceiver
  5. B0505LS power supply isolation module
  6. RT9193-33 power chip
  7. SMAJ12CA transient suppress diode array
  8. Auto-recovery fuse
  9. Status indicator
    PWR: power indicator
    RXD/TXD: UART transceiving indicator
  10. Raspberry Pi GPIO connector: for connecting Raspberry Pi
  11. RS485 terminal
  12. MCU control header: for connecting host control boards like Arduino
  13. 120Ω terminal resistor switch
  14. Interrupt pin switch
  15. Operating mode selection
    Half-auto: A=0, B=1
    Full-auto: A=1, B=0

It is easy to control the 2-channel RS485 for auto-transceiving via the SPI interface. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for fields like industrial automation.

Note: Raspberry Pi is not included with this product.

Useful link:

To explore more about this module, please follow this link .


  1. Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
  2. Adopts SC16IS752+SP3485 dual-chip combination, converts SPI to RS485, data rate up to 921600bps
  3. Allows transceiving data manually or automatically, configured by DIP switch
  4. Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic
  5. Onboard auto-recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistance
  6. Onboard LEDs for indicating the power and transceiver status
  7. Breakout SPI control pins, for connecting with host control boards like Arduino

Package Includes: 

1 x 2-CH RS485 HAT

1 x 2x20PIN female pin header

1 x RPi screws pack (2pcs)

UART Expansion Chip


RS485 Transceiver


Communication Interface


Data Rate

300 ~ 921600 bps

Operating Voltage (VDC):

3.3 ~ 5

Length (mm):


Width (mm):


Height (mm):


Mounting Holes Diameter (mm)


Weight (g):


Shipping Weight 0.035 kg
Shipping Dimensions 7 × 6 × 3 cm
6 Months Warranty

This item is covered with a supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China