Waveshare Dual ETH Quad RS485 Base Board (B) for Raspberry Pi Compute Module 4

This base board transforms a bare Compute Module 4 into a genuine industrial communication hub, with two independent Ethernet ports for dual-network connectivity or network redundancy, and four RS485 channels for talking to legacy serial industrial equipment. That combination suits a build acting as a protocol gateway - bridging RS485 field devices onto a network, or running redundant network paths for a critical monitoring application - rather than a simple single-purpose embedded project. Building this around the Compute Module 4 means the host board brings genuine processing power to the gateway role, not just the bare I/O a simpler microcontroller board would offer.