Name: Modular RS485 Board
Type: Adpater Board
Version: 1.0.0
Author: Dubravko Penezic
Copyright: Creative Commons BY-NC-SA v 3.0
Implemented function:

• ESD protection of input line via TVS diodes
• Termination resistor with jumper
• Bias resistors with jumpers
• MAX485 chip (pdf)
• LED signaling RO & DI line with jumper
• PullUp resistor on all output lines with jumper
• Prepare configuration for RS232 connection
• Cross power line connectors (GND, +5V)

PCB Top & Bottom image:

Schematic:

Implementation examples: