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Glossary
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
FDL
See
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.