Basic Documentation

Glossary
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7 Glossary
Term Definition
AS or PXC Automation station for control of primary plants: PXC50/100/200-E.D
Group master Group master in Desigo room automation to distribute operating modes, setpoints, or
coordination signals to assigned group members.
Group member Group member – logistical merger of HVAC, lighting, or shading functions.
BAC system Building automation and control system
CLI Command line interface, often referred to as console or terminal, is input pane to control
software, typically (but not necessarily) text based.
SNMP (Simple Network Management Protocol) A protocol developed by the Internet Engineering
Task Force (IETF) to monitor and control network elements, including printers, switches,
or computer, from a centralized location.
Latency time Delay time, i.e. time interval from end of an event or command to the start of the reaction
to this event.
Network latency exists on communication networks. On Ethernet networks, this latency is
caused by runtimes on the transmission medium and Ethernet switching. The latency time
describes the time period that passed until bit received on the switch port leaves the
destination port. The period is indicated in microseconds and is based on the switching
method.
STEP7/TIA Engineering tool for programming and commissioning automation stations and room
automation stations.
BBMD (BACnet Broadcast Management Device) Is used to distribute BACnet broadcasts over
multiple IP segments.
Symmetrical BDT (BACnet Distribution Table) Symmetrical means that all BBMDs are entered in the BDT,
the BBMDs recognize one another and the unicast is distributed to all devices entered in
the table.
Asymmetrical BDT (BACnet Distribution Table) Asymmetrical means that the BACnet broadcast originating
from a BACnet client on one IP segment travel in only one direction and are can be
distributed to all other IP segments. No broadcasts are distributed from the queried IP
segment to other IP segment so that broadcast data traffic on BACnet networks,
distributed over multiple IP segments, can be controlled and kept to a minimum.