RS-485EVALBOARD3 is an evaluation board designed to aid in evaluating circuit protection on RS-485 serial device port solutions. It utilizes Bourns' TBU High-Speed Protectors (HSPs), Metal Oxide Varistors (MOVs), Gas Discharge Tubes (GDTs), and Transient Voltage Suppressor (TVS) products to meet required industry standards on RS-485 port interfaces. The board measures 53.5 mm x 25.3 mm x 0.85 mm and is manufactured using FR4 PCB with nickel gold plating on top and bottom sides. The default configuration includes two GDTs with FLAT technology (2017-09-SMH-RPLF, 90 V), two TBU-CA065-300-WH single bidirectional line protectors (850 V, 300 mA), and one dual bidirectional TVS diode (CDS0T23-SM712, 12 V SOT23). This evaluation board enables design engineers to increase surge and transient protection levels on RS-485 ports while placing the entire circuit protection solution into a smaller PCB area.