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)
  • maritime and navigation controls (NMEA0183)
  • video surveillance (for example Pelco D)

 

If you like to know more about RS485 visit this website: http://www.radio-electronics.com/info/telecommunications_networks/rs485/rs-485-tutorial-basics.php

 

You may also like: RS422/RS485 Shield for Arduino

 

Webstore:

This kit is also available at ThePiHut.com.

Downloads

Datasheet and DIP Switch Settings (current version)
REV C - for HAT Version 01-02-00
Datasheet RS485 HAT Rev C.pdf
Adobe Acrobat Document 1.3 MB
Datasheet and DIP Switch Settings (old version)
REV B - for HAT Version 01-01-00
Datasheet RS485 shield Rev B.pdf
Adobe Acrobat Document 396.0 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 B.pdf
Adobe Acrobat Document 88.2 KB
How to use the RS422/RS485 HAT with NMEA-0183
Application Note: How to use the RS422/RS485 HAT with NMEA-0183 protocol to read GPS or Sonar systems
Application Note NMEA 0183 Rev A.pdf
Adobe Acrobat Document 196.3 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
Schematic
RPI_RS485 Schematic V01-01-00.pdf
Adobe Acrobat Document 210.9 KB

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