| # 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. | |