Modbus is a communication protocol commonly used in building systems to allow devices like meters to exchange data. It was developed in 1979 and is still widely used today.
Modbus defines how data is transmitted between devices over serial lines (RTU) or over IP (TCP). Onboard supports Modbus TCP, which allows devices to communicate over a local network using Ethernet or Wi-Fi.
To access data from a Modbus device, you need to know: