Siemens BACNET 125-699 - Manual (Page 38)

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Glossary
Overview
The glossary contains terms and acronyms that are used in this manual. For definitions of
point database descriptors, see Chapter 3, Point Database.
Al
Analog Input. Point that receives a signal that represents a condition which has more than
two states. For example, flow rate sensors (water or air), temperature sensors (room or duct),
pressure sensors (static or velocity), and humidity sensors (room, duct, or outdoor).
airflow
Rate at which a volume of air moves through a duct. Usually expressed in cubic feet per
minute (cfm).
algorithm
Mathematical formula that uses varying inputs to calculate an output value.
AO
Analog Output. Physical point that generates a continuous variable signal.
BACnet
A data communication protocol for Building Automation and Control networks.
centralized control
Type of control offered by a controller that is connected by means of a Field Level Network
(FLN).
cfm
Cubic Feet per Minute.