Post 1 - Synopsys
Of course you will need RPI. The above annotation shows important parts that need. If you want to use Wi-Fi , you would need a dongle also. You can purchase RPI from many online stores, I bought from Crazy pi for 3k
Dongle also from same place
5v relay board
Bought from eBay http://m.ebay.in/itm?itemId=111309959285, for RS450. Works perfectly with RPI.
You would need some jumperconnectors to connect pi and ready board...
You will need to run wire from trust board to device which you control.