Electronic Signature
A feature of a Metasys for Validated Environments, extended architecture (MVE) system that satisfies United States Food and Drug Administration (US FDA) Title 21, Code of Federal Regulation (CFR) Part 11 Requirements for Electronic Signatures. This feature requires users to reenter their password (re-authentication challenge), state a meaning associated with the signature, and enter an annotation when they make a change to the system or when acknowledging an event. The system does not execute the requested change until users perform all three actions.
Elliptic Curve Cryptography (ECC)
Elliptic Curve Cryptography. ECC certificates use an algebraic structure method of encryption. ECC certificates are used in Metasys' BACnet/SC implementation. They can be procured by the customer or can be purchased from Johnson Controls.
Energy Essentials
Enthalpy
In HVAC applications, heat content as the internal energy of the system plus the pressure times the volume of the system.
Equipment
A broad term used to describe the equipment that makes your building run. Equipment includes boilers, chillers, air handling units, lights, meters, security systems, and anything else that is used to maintain your building's environment. Equipment can serve spaces and other equipment. The Metasys UI product uses the term equipment.
Equipment Dashboard
A tabular and graphical representation that provides a cohesive summary of a selected piece of equipment. Information displayed includes alarm history, user change history, equipment graphics, historical trend information, and relationships with other equipment and spaces.
Equipment Definition
Equipment definitions help define equipment so that the Metasys UI displays the most important data from equipment that serves a space or another piece of equipment. Equipment definitions are used to generate pieces of equipment within Metasys UI.
eXtensible Markup Language (XML)
Text-based language representing data. XML is a simple and easy-to-use subset of the Standard Generalized Markup Language (SGML), the standard for how to create a document structure. system. The Export Utility runs from an ADS/ADX or from a stand-alone computer on the same network. Export Utility extracts historical trend, alarm, and audit data from the network engine or ADS/ADX. This data is then provided in several file formats such as Microsoft Excel and Microsoft Access. You can instantly extract the selected data or schedule an extraction at a convenient time or interval.
eXternal Interface File (XIF)
A file that describes the Standard Network Variable Types (SNVTs) and configuration parameters of a LonWorks enabled device.