1. Install three jumpers to route the RS485-TX, RS485-RX and RS485-EN from the line driver to Raspberry Pi GPIO connector:

2. Disable the RS485 port on the local processor:

~$ megaind 0 wcfgmb 0 9600 0 0

3. Activate the serial port on Raspberry Pi from raspi-config command.

4. Install an USB to RS485 adaptor on your PC.

5. Install a terminal emulator program on your PC.

6. Click HERE to download a Python script to test the communication.

Raspberry Pi RS485 driver using the Industrial and Building Automation Cards