National Instruments NI 6602 User Manual page 56

Glossary
start trigger
synchronous
T
TC
termination
timebase
trigger
tri-state
TTL
two-pulse encoder
U
unstrobed digital I/O
UP_DOWN
V
V
VDC
NI 660x User Manual
A TTL level signal having two discrete levels, a high and a low level, that
starts an operation.
A property of an event that is synchronized to a reference clock.
terminal count—a strobe that occurs when a counter reaches zero from
either direction.
Matching of impedances at the end of a signal path to minimize reflections.
Another term used for the SOURCE of a counter. Usually indicates an
internal SOURCE provided by or derived from an onboard oscillator.
Any event that causes, starts, or stops some form of data capture.
A third output state, other than high or low, in which the output is undriven.
transistor-transistor logic
A motion encoder that has two channels: channels A and B. Pulses on
channel A indicate movement in one direction while pulses on channel B
indicate movement in the opposite direction. This type of encoder is also
referred to as up down encoder.
A type of digital input or output in which software reads or writes the
digital line or port states directly, without using any handshaking or
hardware-controlled timing functions. Also called immediate,
nonhandshaking, or unlatched digital I/O.
The signal that determines whether a counter increments or decrements.
volts
volts direct current
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