What Is Net32?
Net32 is a lightweight network protocol designed for communication between devices in embedded and industrial systems. It operates over standard Ethernet and is often used in environments where low overhead and deterministic data exchange matter more than raw throughput.
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The protocol's primary role is to provide a simple, reliable framing mechanism for messages between a controller and remote terminals. Because it runs on top of familiar Ethernet hardware, Net32 can be implemented without specialized physical layers, reducing cost and complexity. In practice, it is most common in building automation, energy management, and certain legacy industrial control networks.
How Net32 Works
Net32 uses a compact header to define the message source, destination, and payload length. This allows devices to parse incoming frames quickly and with minimal memory, which is critical for resource-constrained embedded controllers. The payload typically carries command and status data, while error checking is handled by a cyclic redundancy check appended to each frame.
Communication follows a master-slave pattern where one device initiates requests and others respond. There is no built-in routing; the protocol depends on the underlying network switch infrastructure to deliver frames to the correct endpoint. This design keeps the protocol simple and predictable, though it limits scalability in large, multi-subnet deployments without additional network management.
Typical Use Cases
- Building automation controllers communicating with sensors and actuators over BACnet or similar supervisory layers.
- Energy meter reading and submetering networks in commercial facilities.
- Legacy industrial gateways where a simple, low-cost fieldbus alternative is required.
Considerations When Using Net32
Because Net32 is not a routable protocol in the IP sense, it works best within a single Layer 2 broadcast domain. Network planners often bridge or tunnel Net32 traffic over IP when linking separate segments. Security is generally handled at higher layers or through network segmentation rather than within the protocol itself, so placing Net32 traffic on an isolated VLAN is a common hardening practice.