Part 9 of the Industrial Networking: Serial to Ethernet training series
A protocol is the language that devices speak with a given pattern. The devices send on/off pulses grouped into bytes, the first of which in a MODBUS string, says which device it is speaking to. Different protocols interpret the bytes differently often to what makes sense for the application.
Long-time automation trainer Doug Bell, Interconnecting Automation, covers the basics of Industrial Networking with AutomationDirect’s Chris Harris. This video is produced by CFE Media to be noncommercial and educational. Runtime is approximately 6 minutes.