AAON - OE391‑12‑A - Modular Service Tool SD Operator Interface

Main Features

• Manufacturer: AAON (under WattMaster/Orion Controls branding)  

• Model/MPN: OE391‑12‑A (also known as OE391‑12 Modular Service Tool SD)  

• Device Type: Handheld modular service tool / system operator interface (4‑line × 20‑character display)  

• Display & Input: 4‑line by 20‑character backlit display with 27‑key membrane keypad; menu‑driven for simple configuration  

• Memory & Power: Includes 4 GB SD memory card, runs on 4 × AA batteries, plus can use external DC power supply  

• Connectivity: Equipped with mini‑DIN and RS‑485 connectors for interfacing with various Controllers (VAV/CAV, VCM‑X, VCM, VCB‑X, RNE, SA E‑BUS, etc.)  

• Rugged Design: Durable black plastic housing with protective bezel, designed for field use  

• Primary Function: For viewing status, configuring parameters, adjusting setpoints, and updating E‑BUS module software on Orion control system controllers via handheld interface