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MODBUS PROTOCOL, https://en.wikipedia.org/wiki/Modbus - Coggle Diagram
MODBUS PROTOCOL
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Definition
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Modbus supports communication to and from multiple devices connected to the same cable or Ethernet network
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Modbus has become a de facto standard communication protocol for communication between industrial electronic devices in a wide range of buses and network
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Steps
Step1, Client initiates request with PDU
PDU = Function code + Data request
Step 2, Server receives the request from client.
If there is no error during those steps, server will response PDU = Function code + data response
If there is any error during those steps, server will response PDU = Exception Function code + Exception code
Step 3, Client receives the response and ends the transaction.
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