Johnson Controls MS-N301312-1 Metasys N30 Supervisory Controller – N2 Bus, BACnet/IP, 12 RS-232 Ports, 24 VAC Power, Legacy Building Automation System Controller

Johnson Controls MS-N301312-1 Metasys N30 Supervisory Controller – N2 Bus, BACnet/IP, 12 RS-232 Ports, 24 VAC Power, Legacy Building Automation System Controller

Condition: Used. Shows signs of previous installation including panel mounting marks and wear on casing.

The Johnson Controls MS-N301312-1, part of the Metasys N30 Series, is a supervisory controller designed for use in building automation systems (BAS). As a cornerstone of legacy Metasys platforms, the N30 acts as a central point of control and data integration for HVAC, lighting, security, and other subsystems, particularly in large-scale commercial, institutional, or industrial settings.
This model supports multiple communication protocols, including N2 Bus, BACnet/IP, and serial interfaces, allowing it to bridge older field-level controllers with newer supervisory infrastructure. With 12 RS-232 ports, the MS-N301312-1 is specifically configured for expanded serial connectivity—ideal for facilities that incorporate a large number of field devices using proprietary or non-Ethernet communication layers.
Although now considered a legacy controller, the N30 is still in use within long-running Metasys environments and remains essential for backward-compatible systems that have not yet migrated to Johnson Controls’ newer FX or Metasys SMP platforms.

🔧 Features
Model: MS-N301312-1
Series: Metasys N30 Supervisory Controller
Controller Type: Supervisory, legacy BAS controller
Communications:
BACnet/IP
N2 Bus (for older JCI field controllers like UNT, VMA, AHU series)
RS-232 ports: 12 total – supports serial device integration
Power Supply: 24 VAC
Network Function: Supervises and coordinates multiple lower-level controllers
User Interface: Typically configured using Johnson Controls Metasys software tools
Mounting: Panel or wall mountable enclosure
Protocols Supported: BACnet/IP (client), N2 Bus, RS-232 serial integration
LED Indicators: Status and network activity lights for diagnostics

🛠️ Applications
This controller is typically found in:
Commercial buildings and campuses
Hospitals and healthcare facilities
Universities and schools with legacy Metasys infrastructure
Government and military buildings
Industrial plant building systems
Used for:
Supervising field controllers (UNT, AHU, VAV, etc.)
Managing HVAC zones, lighting schedules, and alarms
Communicating with central facility management software
Bridging multiple subsystems over diverse communication layers

🔁 Cross-Referenced or Similar Johnson Controls Models
MS-N301013-1 (Standard N30 with 1 RS-232 port)
MS-N301212-1 (N30 with 2 RS-232 ports)
NCM350 / NCM300 (Older supervisory controller with N2 Bus)
FX40 / FX60 / FX80 (Modern replacements in the Facility Explorer line)
Metasys ADS/ADX systems (supervisory software platforms)

🔄 Comparable Products
Tridium JACE 700 Series (modern Niagara-based supervisory controller)
Honeywell XL5000 Supervisory Controllers
Siemens PXC Series Automation Controllers
Distech EC-NetAX Supervisor
Alerton VLC Supervisory Series

🧩 Assembly and System Compatibility
Designed to supervise or interface with:
Johnson Controls N2 field devices: UNT, AHU, VMA, DX9100, etc.
Legacy serial devices (12 RS-232 ports ideal for third-party integrations)
Can be integrated into older Metasys Network Control Module (NCM) or Companion systems
May be accessed and configured using Metasys Operator Workstation (OWS) or HVACPRO software
Often used with Echelon/N2 bus networks
Important Note: No longer supported in current Metasys platforms. Many users migrate to Metasys SMP or Facility Explorer FX lines with modern controllers (IP-based).

Trademark Disclaimer:
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

🔁 Related
N30 supervisory controller
MS-N301312-1 legacy BAS device
Johnson Controls Metasys controller
RS-232 BACnet gateway controller
Building automation controller with N2 bus

📈 Common Requests:
“How to replace or upgrade Johnson Controls MS-N301312-1 controller?”
“Does the N30 support BACnet/IP and N2 at the same time?”
“Legacy Metasys controller with 12 serial ports”
“Used Johnson Controls N30 BAS controller specs”
“Integration options for MS-N301312-1 into newer Metasys systems”

All product names, trademarks, and registered trademarks are the property of their respective owners. Use of these names does not imply any affiliation or endorsement.

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