2.1 Modbus.Net Architecture

Modbus.Net is a communication framework based on the OSI 7-layer model. There is a high degree of similarity between the framework and OSI architecture.

graph TB
    subgraph "Application"
        L7["Machine<br/>(BaseMachine)"]
    end
    subgraph "Presentation"
        L6["Utility<br/>(BaseUtility)"]
    end
    subgraph "Session"
        L5["Protocol<br/>(BaseProtocol / ProtocolUnit)"]
    end
    subgraph "Transport"
        L4["ProtocolLinker / ProtocolReceiver"]
    end
    subgraph "Network"
        L3["Connector<br/>(TcpConnector / UdpConnector / ComConnector)"]
    end
    subgraph "Data Link"
        L2["Controller<br/>(IController)"]
    end
    subgraph "Physical"
        L1["Hardware / Wiring<br/>(not represented in framework)"]
    end

    L7 --> L6 --> L5 --> L4 --> L3 --> L2 --> L1

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The Physical and Data Link layers represent electrical signal definitions and wiring respectively — these are hardware-level concerns not modeled in Modbus.Net.

OSI Layer	Modbus.Net Equivalent
Data Link	Transmission Control Layer — Controller
Network	Transmission Link Layer — Connector
Transport	Concrete Protocol Layer — ProtocolLinker
Session	Abstract Protocol Layer — Protocol
Presentation	Protocol Presentation Layer — Utility
Application	Device Application Layer — Machine + Task Layer — MachineJob