Automated Logic Corporation ZN551 BACnet building automation controller, identified from the visible labeling. OBSERVED: - Brand: Automated Logic Corporation - Model: ZN551 - BACnet controller with BT485 communication interface - Labels indicate MSTP and ARC156 communication selection - Terminal labels include IN-1 through IN-5, DO-1 through DO-5, and AO-1 - Visible status indicators include Power, Run, Error, Flow 1, and Flow 2 - Black enclosure with attached circuit boards, terminal blocks, connectors, and communication-selection switches - Visible label text includes 24 Vac, 50-60 Hz; 26 Vdc; AO 0-10 Vdc; and other electrical information. Verify all electrical requirements independently before use. - Visible identification includes BNI-30, TYPE: 002102, 212640566N, and Z51650553N. Their exact part-number roles are not established. - Visible marking states Made in USA. CONDITION: Used. Unit shows visible dust, scuffs, and handling wear. Cosmetic condition is based on the available evidence. INCLUDED: - Automated Logic ZN551 controller assembly - Attached circuit boards and enclosure - Visible attached terminal blocks and connectors MISSING/NOT VERIFIED: Completeness of terminal blocks, removable connectors, and other accessories has not been independently verified. No additional accessories are confirmed included. TESTING STATUS: Not tested. No powered or operational test is documented. Compatibility, firmware version, and network configuration are not verified. Certification markings and electrical label information should be independently verified before installation or use.