S - Metasys - LIT-1201612 - General System Information - Metasys System - 12.0

Metasys System Glossary

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Metasys System
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Technical Bulletin
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SA Bus

Sensor Actuator Bus. The SA Bus connects end-point devices (XPMs, IOMs, or network sensors) to the equipment controllers.


A programmed instruction that causes some future event to occur or reoccur, such as turning on a supply fan one hour before building occupancy, then turning it off after hours.


System Configuration Tool. A software tool used for offline configuration of network engines and Metasys servers that are components of the Metasys system. The SCT provides an easy way to create and edit archive databases offline. The SCT also provides a logic simulation feature, which allows you to simulate a building automation device and test the database control logic prior to downloading it to a device. You can view and configure multiple Sites in one archive with the SCT.


System Configuration Tool, Professional edition. A newer generation of SCT that provides significantly streamlined workflows, and greatly simplifies tasks that were previously time consuming or cumbersome.

SIMPLEX® Fire System

A type of fire monitoring system for commercial buildings developed by Tyco SimplexGrinnell. From Metasys Release 10.0, the SIMPLEX fire system can be easily interfaced to network engines through BACnet/IP for monitoring only.

Site Director

Either a Metasys server or a network engine that has access to all devices in the entire Metasys site. It is the single point of access to all Site Management Portal UI users. Once logged on the Site Director, users have access to a large variety of operations, such as adjusting schedules, monitoring and commanding points, and expanding the system.

Site Management Portal (SMP)

A user interface embedded in the Metasys server and network engines that provides operators with a host of building management functions, such as monitoring and commanding equipment, programming schedules, and printing reports.

Security ID (SID)

Alphanumeric character string that uniquely identifies Active Directory service users and groups within Active Directory service. Unlike a user name or group name, which may be renamed, the SID remains constant throughout the life of the user account or group.


Elements on a graphic that convey information. Examples of shapes include circles, squares, diamonds, and the many flowchart shapes.

Single Sign-On (SSO)

A user’s ability to log on (sign-on) to a network resource such as a Microsoft Windows OS, and then access a privileged network resources or applications including the Site Management Portal UI, without providing user name and password credentials again.


A continuously connected network of devices configured as a system for building control and user access.

Site Object

A type of object in the navigation tree that represents the physical network of connected devices on the site. The device where the Site object resides is considered the Site Director. One important function of the Site object is to maintain time-of-day synchronization for a site.

Site Director

A uniform point of entry to the system, allowing you to view all network components including the information defined in the Site object. For each site, a single engine or Metasys server is designated as the Site Director. A network engine may be designated as the Site Director on small networks consisting of single or multiple network engines. On larger networks with single or multiple ADSs/ADXs, an ADS/ADX must be designated as Site Director. The Site Director supports functions such as user logon, user administration, time synchronization, and data-traffic management. The Site Director is the device that holds the Site object.


Simple Mail Transfer Protocol. SMTP is a protocol for sending e-mail messages between servers.


The SNC is an Ethernet based, supervisory and equipment controller that connects Building Automation System (BAS) networks to IP networks. The SNC Series of network control engines succeed the NCE Series of network control engines.


The SNE is an Ethernet based, supervisory engine that connects Building Automation System (BAS) networks to IP networks. The SNE Series of network control engines succeed the NAE35, NAE45, and NAE55 Series of network automation engines.


Simple Network Management Protocol. SNMP is the primary protocol governing Internet Protocol (IP) network management and the monitoring of IP network devices and their functions.


Simple Network Time Protocol. SNTP is a simplified version of Network Time Protocol. These protocols allow computers to synchronize current time across a TCP/IP network. SNTP may be used to synchronize the Site Director time with a third-party SNTP time server either publicly (on the Internet) or privately (customer-owned on the LAN/WAN).

Software Manager

A software application that is part of the Metasys software suite that you use to register licensed products.


A physical location or area that is served by a piece of equipment. The Metasys UI product uses the term space.

Space Dashboard

A tabular representation that provides a cohesive summary of the selected space, including the equipment that serves the space and potential problem areas in the space.

SQL Server

A database application from Microsoft in use by several Metasys software products.

SSL certificate

Secure Sockets Layer certificate. Used in computer networking, an SSL certificate provides a secure, encrypted communications between a website and an internet browser.

Star topology

A type of network topology in which all nodes are individually connected to a central point, like a hub or switch. Because each node is connected by individual cable segments, the benefit of a star network is if one cable fails, only one node is brought down.


Pictorial elements on a graphic that represent building equipment, such as fans, coils, valves, and ductwork.


Syslog is a standard for message logging. Syslog separates the software that generates messages for logging, the system that stores the messages, and the software that generates reports. In the Metasys system, the servers and network engines provide the optional capability of sending its configured audit log entries and event notifications to an external, customer-provided Syslog server.