Isolated RS485 RS232 Expansion HAT for Raspberry Pi, SPI Control

SKU: 21648
Part Number: RS485 RS232 HAT
Brand: Waveshare


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Isolated RS485 RS232 Expansion HAT for Raspberry Pi, SPI Control, Onboard Protection Circuits
Isolated RS485 RS232 HAT for Pi

Comes with development resources and manual

Features at a glance
  • Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
  • Adopts the combination scheme of SC16IS752, SP3485 and SP3232, converts SPI to one RS485 and one RS232
  • Onboard resettable fuse and protection diodes, ensure the stable output of RS485 current and voltage, prevent over-current and over-voltage, improve shock proof performance
  • Onboard TVS (Transient Voltage Suppressor), can effectively suppress surge voltage and transient spike voltage in the circuit, lightningproof & anti-electrostatic
  • Breakout SPI control pins, for connecting with Arduino and other host control boards
  • Comes with development resources and manual (examples in C and Python)
uart expansion chip SC16IS752
Communication Interface SPI
RS485 transceiver SP3485
RS232 transceiver SP3232
data rate Up to 921600bps
Operating Voltage 5V
Mounting hole size 3.0mm
Dimensions 65mm × 56.5mm
Standard Raspberry Pi 40PIN GPIO header

Suitable for Raspberry Pi series boards

RS485 and RS232 support

RS232: full-duplex communication, SP3232 transceiver
RS485: semi/full-automatic communication, SP3485 transceiver

Overcurrent/Overvoltage proof, High Stability!

Onboard TVS (Transient Voltage Suppressor) And resettable Fuse, Can Effectively Suppress Surge Voltage And Transient Spike Voltage In The Circuit, Improve Shock proof performance

Interface definition
What's On Board
  1. Raspberry Pi GPIO interface
    for connecting to the Raspberry Pi Board
  2. MCU control interface
    for connecting to other host boards such as Arduino
  3. RS485 interface
  4. RS232 interface (DB9 male)
  5. SC16IS752 UART chip
  6. SP3485 RS485 Transceiver
  7. SP3232 RS232 Transceiver
  8. π142 Digital Isolator chip
  9. PC817 Optocoupler Isolation
  10. B0505LS Power Isolation Module
  1. RT9193-33 power chip
  2. TVS (Transient Voltage Suppressor)
  3. Resettable Fuse
  4. Status Indicator
    PWR: Power indicator
    RXD/TXD: UART transceiving indicator
  5. RS485 120Ω terminal resistor on/off
  6. Interrupt pin switching
    Use D24 pin by default, can be changed to D16/D12/D25 pin by re-soldering the position of 0Ω resistor
  7. RS485 operating mode selection
    Semi-automatic: A=1, B=0
    Full-automatic: A=0, B=1
Outline dimensions
Resources & Services

* Resources for different product may vary, please check the wiki page to confirm the actually provided resources.

Weight: 0.033 kg

Quick Overview

  1. RS485 RS232 HAT x1
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  3. RPi screws pack (2pcs) x1