RS422 / RS485 Serial HAT V2 for Raspberry Pi

A professional RS422/RS485 HAT for Raspberry Pi with galvanic isolation and an extensive range of features making this ideal for both industrial and home use.

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, damage to the Raspberry Pi or malfunction of the device is possible, because of the large distances of an RS485 bus. Furthermore, a full-duplex mode (RS422) is also not integrated.

Compatible with all 40-pin models of Raspberry Pi, including Raspberry Pi 5, 4, 3B+, 3B, 2B and B+.

Raspberry Pi not included.

Features

• RS485 mode (half duplex)
• RS422 mode (full duplex)
• Galvanic isolation between Raspberry Pi and connected RS485 bus
• Selectable UART via jumper (Pi4 and Pi5 only)
• 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
• Stackable header

Resources

• DIP Switch and Jumper setting (current version)
  
• How to use the RS422/RS485 HAT for Modbus
• How to use the RS422/RS485 HAT with NMEA-0183
• How to use the RS422/RS485 HAT for DMX512

Package Contents

• 1x RS422 / RS485 Serial HAT for Raspberry Pi (V2)
• 1x Pluggable terminal block

Raspberry Pi not included.

Revision History

• As of 16/12/2025 - we are now stocking the latest V2 model of this HAT