The RS485 Board (5V) is an accessory board used for adding the RS485 transceiver to your application board. The RS485 Board (5V) features a MAX485 onboard, integrates pin headers and connectors. It is designed to use 5V power supply.)
The FTDI Basic Breakout (5V) is a basic breakout board for the FTDI FT232RL USB to serial IC. The pinout of this board matches the FTDI cable to work with official Arduino and cloned 5V Arduino boards. It can also be used for general serial applications. The major difference with the FTDI Basic board is that it brings out the DTR pin as opposed to the RTS pin of the FTDI cable. The DTR pin allows an Arduino target to auto-reset when a new Sketch is downloaded. This is a really nice feature to have and allows a sketch to be downloaded without having to hit the reset button. This board will auto reset any Arduino board that has the reset pin brought out to a 6-pin connector.