November 2008

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Legacy Building Automation Integration
The BACnet-N2 Router is a network appliance hosted on the Advantech Embedded Automation Computer.

  Steve Jones

Steve Jones
Managing Partner
 The S4 Group, Inc.

Project Introduction:

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Location – USA

The S4 Group, Inc. is a software development and system integration company focused on providing open interfaces to legacy building automation systems.  A large multi-national government contractor contacted us indicating that they were interested in a BACnet-N2 Router.  In addition, the customer requested a solution that exceeded the standard S4 Open product capabilities and asked if a custom solution could be developed. They needed to bring information from electric power monitoring meters, building and network infrastructure equipment, and other devices into their Johnson Controls Metasys® building automation system. The traditional integrations that were offered by the manufacturer were not adequate for their needs.

System Requirements:

* Provide a system to gather information from any OPC based device, SNMP manageable device, or Modbus device and publish it to either Johnson Controls Proprietary N2 Bus or to BACnet.
* An auto-discovery and auto-configuration wizard similar to those included in S4’s standard products is required.
* The resulting integrated devices and point lists must be definable to Metasys® NCM and NAE based supervisory controllers with the minimal possible manual effort.

Project Implementation: Advantech products used: UNO-2059E – AMD GX2 Embedded Automation Computer with 4x COM, LAN, and PC Card.

System (Hardware) Description: The solution is based on our S4Open: BACnet-N2 Router. The BACnet-N2 Router is a network appliance hosted on the Advantech Embedded Automation Computer, the UNO-2059E platform.

S4 Open: BACnet-N2 Router

S4 Open: BACnet-N2 Router

Standard functions and features of the S4 Open: BACnet N2 Router:

* The BACnet-N2 Router from the S4 group enables seamless migration to BACnet environments for Metasys® N2 legacy systems while preserving existing investment in N2 Bus based infrastructure.
* Built-in Ethernet connectivity offers broad flexibility for introducing future protocol plug-ins to support additional standards based open interfaces.
* The BACnet-N2 Router introduces cost saving in virtually every upgrade, enhancement, or replacement of legacy Metasys installations.

All of the S4 Open appliances, the N2 Switch, the OPC-N2 Router, and the BACnet-N2 Router extend and enhance traditional Johnson Controls Metasys® building automation systems. The products are developed around Obermeier Software’s software framework which allowed S4 to develop a core set of functions critical to the building automation industry and then add protocol and application plug-ins to extend that functionality in a Lego®-like manner. Each protocol or application that is developed becomes a building block for other products or product options.

Technology Core

contemporary On the hardware side, our company made the decision that we didn’t want to be in the hardware manufacturing business. We did a product search and found that Advantech’s UNO-2059E was a nearly perfect match for our needs. In addition, the Advantech ADAM Ethernet Serial servers and I/O devices gave S4 additional capabilities that very few others in the Building Automation marketplace can match as cost effective. As our Open product line matures, you’ll see new variations on larger or smaller Advantech platforms. For instance a request for a Small Building Version of the OPC-N2 Router. S4 will be looking at Advantech’s UNO-1019 (similar to UNO-2059 but more compact and DIN rail), the TPC product family (Touch Screen for a Controller version of the product with on-board HMI), and also the ADAM-6501 (low end N2 router targeted towards small buildings, very price effective).

We emphasize that one of the key advantages of delivering the product as a network appliance with the hardware and software pre-installed is the cost effectiveness of the solution. The customer wires the power and data, installs an administrative client on his PC, runs an auto-configure command, and they are in production! All competing alternatives has seen take days worth of planning and configuration support to get them up and running. They have to go through the same process if they have to make configuration changes in the future.

All systems and appliances within the S4 Open family of products are managed by this single management console. Being familiar with one of our Open Products means you are automatically familiar with all other S4 Open Products. The Console uses Microsoft Windows' Look & Feel which is the defacto state of the art in the User Interface Technology.

This capability allows you to either centrally manage all appliances in your network or distribute the management responsibility as appropriate within your organization. Each Open Appliance is identified by a name and can include further optional administrative information such as a description, location and contact person. After you assign a name to the Appliance this name will be used in the S4 Open: Console for easy reference.

The Console is based on Microsoft Management Console technology and implements all requirements in the Microsoft style guide to certify for the "designed for XP" or "designed for Vista" logo.

When you purchase and license any S4 Group, Inc. product you may install the Console on as many Windows desktop systems as you need to monitor and manage your enterprise.

Conclusion: One of the elements in this project solution design is the flexibility in delivering features as they were developed, rather than asking the customer to wait for actual release of the product. Instead of approaching the requirements as a custom application the software framework and Advantech product line hardware flexibility allowed us to meet the customer’s very specific requirements and package each of the integrations as optional features that could be added to any of our standard products. This greatly decreased the cost to design and development of these integration capabilities.

System Diagram

System Diagram

About the Author
Steve Jones is Managing Partner of The S4 Group, Inc. in Ogden, UT. He is an entrepreneur focused on providing open systems interfaces for legacy building management systems. Mr. Jones has more that 30 years experience in the networking, telecommunications, systems integration, and building automation industries. Prior to forming The S4 Group he was a senior member of Johnson Controls System Products Engineering organization providing enterprise solutions and integrating the Metasys® Building Automation System into Johnson Controls most complex customers’ IT environments, enterprise network infrastructure, and SNMP management platforms.


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