Glossary
NI-FBUS Monitor User Manual G-2 ni.com
C
capture document An NI-FBUS monitor document in memory that contains all the settings
and data of your capture.
CD Compel Data.
channel A pin or wire lead to which you apply or from which you read the analog
or digital signal.
checksum A method used to ensure that data is transmitted correctly.
Communication Stack The hierarchy of layers in a layered communications model that performs
the services required to interface the User Application to the Physical Layer
of the fieldbus.
CPU Central processing unit.
D
data packet A unit of data of a certain size.
dead Inactive or not functioning on the fieldbus.
DMA Direct Memory Access.
DRAM Dynamic Random Access Memory. Memory that requires electricity and
refreshing to hold data.
F
FAS See Fieldbus Access Sublayer.
FDL See Fieldbus Data Link layer.
fieldbus An all-digital, two-way communication system that connects control
systems to instrumentation.
Fieldbus Access
Sublayer
The layer of the communication stack that provides an interface between
the DLL and layer 7 of the OSI model. The FAS provides communication
services such as client/server, publisher/subscriber, and event distribution.
fieldbus address Location of a board or device on the fieldbus; the fieldbus node address.