Mike Baker on Instagram: "If you're integrating legacy PLCs, Modbus protocol keeps coming up. Understanding Modbus basics helps you understand what's possible and what's not with your legacy integration approach. Modbus is a simple protocol designed in the 1970s for industrial communication. It's openly documented. Multiple vendors support it. It's rock solid for the applications it was designed for. Most legacy PLCs support Modbus to some degree. Modbus works by having a master (typically your