WAGO 750-830 Manual page 333

BACstac
Function libraries that implement the BACnet protocol and interfaces with
well-known high-level languages are known as BACstacs. BACstacs are
generally available on the market. BACstacs simplify and accelerate the de-
velopment of new BACnet devices, as protocol communication at the lowest
level is already implemented by BACstac, enabling the developer to build
directly upon the application level.
Baseband
Baseband systems are systems that operate without carrier frequencies, i.e.
with non-modulated signals. This means they provide exactly one channel
that must be logically adapted to the various, specific requirements. Oppo-
site: Broadband
BBMD (BACnet Broadcast Management Device)
BACnet uses broadcast messages ("to everyone") for data communication
via networks. Many routers block broadcasts. This is why special routers,
BBMDs, are used in networks. A BBMD receives a broadcast that is to be
sent to a different network and transmits it directly to the BBMD in the other
network. The BBMD receiving the message then transmits the broadcast
within its local network. This allows the broadcast to be received by the tar-
get device.
Network participants must be registered at the associated BBMD.
B-BC (BACnet-Building-Controller)
The BACnet Building Controller forms one of six different device profiles
described by the BACnet Standard. The B-BC is comparable to a control
system in building automation services (Direct Digital Control (DDC)).
To meet the requirements of the BACnet Standard for a B-BC, or for a de-
fined device profile, certain BACnet objects, services, etc., must be imple-
mented in the device. These are defined by the function blocks (BIBBs).
The BIBBs that are supported by the device are entered in a document
(PICS) that serves as the basis for communication and comparison for manu-
facturers and customers.
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
Glossary • 333