Glossary
VXI-MIO Series User Manual
G-14
National Instruments Corporation
signal
Any communication between message-based devices consisting
of a write to a Signal register.
SIMM
Single In-line Memory Module
SISOURCE
SI counter clock signal
slot
A position where a module can be inserted into a VXIbus
backplane. Each slot provides the 96-pin J connectors to interface
with the board P connectors. A slot can have one, two, or three
connectors.
S/s
Samples per Second—Used to express the rate at which a DAQ
board samples an analog signal.
STARTSCAN
start scan signal
statically configured device
A device whose logical address cannot be set through software;
that is, it is not dynamically configurable.
system
A system consists of one or more mainframes that are connected,
all sharing a common Resource Manager. Each device in a system
has a unique logical address.
system RAM
RAM installed on a personal computer and used by the operating
system, as contrasted with onboard RAM.
T
TC
terminal count—The highest value of a counter.
THD
total harmonic distortion—The ratio of the total rms signal due to
harmonic distortion to the overall rms signal, in dB or percent.
transfer rate
The rate, measured in bytes/s, at which data is moved from source
to destination after software initialization and set up operations;
the maximum rate at which the hardware can operate.
TRIG
trigger signal
trigger
Any event that causes or starts some form of data capture.
TTL
transistor-transistor logic
