The modules makes it simple to use with microcontroller's UART to to create bidirectional RS485 networks.
The Arduino Pro Mini is a microcontroller board based on the ATmega328p,14 digital input/output pins & 0.7x1.3"(18x33mm)
The BareDuino Nano is the world’s smallest Arduino compatible board. Based on SparkFun’s Arduino Pro Mini, it features 14 digital input/output pins, 8 analog pins, a 16 MHz crystal oscillator and FTDI interface ports for programming.
Seeeduino Ethernet is a compact and multi functional development platform, which merges data logging and processing, device control and Ethernet communication together into one.