# OTWatch laboratory protocol

Synthetic cold-storage OT fixture. Eight aliased assets per plant. No live PLC.

## Streams

- `process`: zone temperature, freezer temperature, compressor Hz, suction pressure, humidity, door, defrost.
- `network`: normalized Modbus-like frames (`read_holding`, `read_input`, `write_single`, `write_multiple`, `read_id`).

## Gold

- `process_fault`: sensor stuck/drift, allowlisted communication.
- `maintenance`: scheduled defrost plus engineering writes.
- `needs_review_unauth_write`: write from an unknown host.
- `needs_review_unauth_scan`: unusual function codes from an unknown host.
- `unknown_cause`: process drift overlapping unexpected reads.

Process anomaly is not a cyber attribution. A process model alone does not prove a cyber origin.