Raspberry PI 4 dual RS485 expansion board communication module SPI interface dual channel isolation type

This Dual RS485 Expansion Board is specifically designed for the Raspberry Pi 4 and adds two independent RS485 communication ports via the SPI interface. It supports full electrical isolation between the RS485 channels and the Pi, improving signal stability and protecting the Pi from surges, ground loops, and electromagnetic interference (EMI).

Each RS485 channel can operate simultaneously and independently, allowing the Raspberry Pi to interact with multiple Modbus RTU devices, PLCs, industrial controllers, or sensors. The module supports automatic receive/transmit direction control, removing the need for manual DE/RE pin toggling.

Its plug-and-play design makes it easy to stack on a Raspberry Pi, and it is ideal for applications in industrial communication, home automation, and IoT edge nodes.