Product Short Description
Product Overview
Core network gateway and logic controller for Johnson Controls Metasys building management system (BMS). Functions as central data aggregator, protocol translator and distributed control logic processor for commercial HVAC, smoke exhaust, lighting and energy monitoring systems, managing all BACnet MS/TP and N2 bus field controllers on a single network segment.
Description
Technical Core Specifications
- Main Processor: 32-bit multi-task industrial real-time CPU
- Onboard Memory: Flash storage for program logic + backup SRAM with dedicated MS-BAT1010 lithium backup battery
- Communication Interfaces
1 × 10/100Mbps Ethernet RJ45 port for upper-level workstation connection
2 × RS-485 BACnet MS/TP / N2 field bus trunk ports
2 × RS-232 serial ports for local service terminal connection
2 × USB 2.0 ports for configuration upload/download
- Supported Field Devices: Max 100 addressable BACnet/N2 controllers per trunk channel
- Power Input: 24 VAC 50/60Hz nominal operating supply
- Physical Dimensions: 200 mm × 160 mm × 60 mm DIN rail mount enclosure
- Operating Ambient Temperature: -20°C ~ +60°C
- Humidity Tolerance: 5%RH ~ 95%RH non-condensing
- Vibration Compliance: IEC 60068-2-6 (5g, 10–150Hz)
- Shock Resistance: IEC 60068-2-27 (50g, 11ms)
- Protection Class: IP30 (indoor cabinet installation only)
Functional Features
- Native BACnet MS/TP and N2 bus dual protocol support for seamless interconnection of legacy and new Metasys field controllers
- Embedded real-time scheduling engine for HVAC optimal start/stop, peak demand limiting and lighting timer control
- Built-in historical data trending storage for temperature, airflow, power consumption and equipment runtime metrics
- Integrated smoke control logic certified to UL UUKL 864 standard for fire safety smoke exhaust system supervision
- Web-based embedded HMI for remote browser access, system configuration and real-time alarm monitoring without dedicated software
- Automatic device fault detection, offline equipment flagging and graded alarm classification with timestamp logging
- Peer-to-peer inter-controller communication without central server dependency for distributed control logic execution
- Backup battery maintains real-time clock and historical trending data for up to 7 days during mains power loss
Material & Structural Composition
- Outer Enclosure: Flame-retardant gray ABS plastic industrial DIN rail housing, ventilation slotted side panels for passive cooling
- Internal PCB: Double-sided industrial grade printed circuit board with conformal anti-humidity coating
- Terminal Blocks: Screw-clamp removable plug-in terminals for field bus and power wiring
- Status Indication: Multi-color LED indicators for power, Ethernet link, bus communication fault and active alarms
- Mounting Mechanism: Standard 35mm DIN rail clip-on locking structure with anti-slip safety latch
Working Principle
The NAE continuously polls all connected field HVAC controllers over RS-485 MS/TP/N2 buses to collect analog sensor values, digital equipment status and fault codes. Embedded real-time CPU executes user-programmed PID regulation, time scheduling and interlock logic locally without relying on a central workstation. Process data is cached in onboard flash memory and transmitted to upper Metasys supervisory workstations via Ethernet BACnet IP protocol. Internal fault diagnosis circuits monitor bus communication integrity and trigger visual/remote alarms when field devices disconnect or report abnormal operating states.
Installation Requirements
- Install only inside lockable electrical control cabinets with minimum IP54 environmental protection rating
- Vertical DIN rail mounting only; horizontal or upside-down installation prohibited to avoid overheating from blocked ventilation slots
- Maintain minimum 20mm vertical clearance above and below the unit for air circulation
- Separate 24V AC power wiring from RS-485 communication cables by minimum 10cm distance to reduce electromagnetic interference
- Use shielded twisted pair cable for all MS/TP bus wiring with single-point ground shielding at cabinet earth bar
- Mount backup lithium battery in dedicated isolated compartment; replace battery every 5 years per maintenance cycle
Application Scenarios
Commercial office building HVAC automation, shopping mall energy management systems, hotel ventilation and lighting control, hospital air handling unit monitoring, commercial parking garage smoke exhaust fire control, university campus building central BMS, data center cooling system supervision
Operation & Maintenance Notes
- Do not open main enclosure casing during live power operation; internal circuit boards carry low voltage hazardous current
- Regularly clear cabinet ventilation filters to prevent dust accumulation blocking unit heat dissipation slots
- Perform annual firmware upgrade via USB port to maintain latest BACnet protocol compatibility and safety logic patches
- Avoid installation near variable frequency drives, high-current contactors or large transformers generating strong electromagnetic noise
- Replace backup battery immediately upon low-battery alarm notification to prevent loss of historical trend data
- Document all custom control logic program backups to USB storage for rapid system recovery after hardware replacement
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