DFRobot DFR0684 RS485 Connector Expansion Shield is designed to expand a reliable RS485 interface (OPEN4) for LattePanda V1. This module offers 12V output power and comes with an on-board 120Ω terminal matching resistor that can be controlled by the switch. The DFR0684 expansion shield features signal isolation, power isolation, lightning surge protection, transient voltage resistance, and bus-protection. These features assure reliable data transmission and protect the LattePanda main-board. This expansion shield uses a stackable connection that can be easily fixed onto LattePanda main-board by copper columns without blocking the heat dissipation. The DFR0684 RS485 connector expansion shield is suitable for RS485 communication scenarios.