RS422 / RS485 HAT for Raspberry Pi

Professional RS422/485 Interface Extension

Some RS485 shields are already available for the Raspberry Pi on the market, but these extensions are not suitable for professional use, because they come without a galvanic isolation between the RS485 bus and the Raspberry Pi. Without such isolation a damaging of the Raspberry Pi or malfunction of the device is possible, because of the large distances of a RS485 bus. Furthermore a full-duplex mode (RS422) is also not integrated.

Our shield comes with a lot of additional features:


  • RS485 mode (half duplex)
  • RS422 mode (full duplex)
  • galvanic isolation between Raspberry Pi and connected RS485 bus
  • enhanced ESD protection
  • adjustable automatic transceiver switching for RS485 mode
  • adjustable control of transceiver/receiver via GPIO pin
  • adjustable Pull-Up, Pull-Down und terminating resistors
  • indicator LEDs for RX and TX 
  • removable block terminal for bus connection
  • many options adjustable via DIP switches


The RS485 is in use in many applications like industrial and home automation (for example MODBUS), lighting control (DMX), video surveillance (for example Pelco D) ...

If you like to know more about RS485 visit this website:


You may also like: RS422/RS485 Shield for Arduino



This kit is also available at


Datasheet and DIP Switch Settings
Datasheet RS485 shield Rev B.pdf
Adobe Acrobat Document 396.0 KB
How to use the RS422/RS485 HAT for DMX / RDM
Application note: How to use the RS422/RS485 HAT for DMX512 / RDM lighting controls
Application Note DMX512 Rev C.pdf
Adobe Acrobat Document 226.9 KB
How to use the RS422/RS485 HAT for Modbus
Application note: How to use the RS422/RS485 HAT for Modbus RTU and ASCII
Application Note ModBus Rev A.pdf
Adobe Acrobat Document 126.5 KB
RPI_RS485 Schematic V01-01-00.pdf
Adobe Acrobat Document 210.9 KB


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