I'm working actually on a professional RS422/RS485 shield for the Raspberry Pi. I wasn't satisfied with the shields on the market. They are very simple and have some disadvantages. My shield comes with the following features:


  • RS422 (full duplex) support
  • RS485 (half duplex) support
  • galvanic isolation between PI and interface
  • indicator leds for RX and TX activity
  • switchable pull-up, pull-down and terminal resistor
  • different modes for send/receive switching (Auto, GPIO, always transmitter, always receiver)
  • Auto switching via monoflop
  • all options adjustable via DIP switches


I'm curious about your feedback.