The Massduino Nano485 is a module which combined microcontroller MD-3248P and RS-485 interface, a onboard DC/DC with input DC voltage up to 48V, the module can be supply power by RS-485 bus, and output 5V and 3.3V 500mA to peripheral circuit.

NANO485 inherits the pin assignment of the standard Massduino NANO and expands more IO pins, so the NANO485 is slightly longer than the standard Massduino NANO.

The MD-3248P is highly compatible with the ATMega328P, but with more IO pins, you can use the MD-32848P just like you would with UNO.