Glossary
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National Instruments Corporation
G-7
power cycling
Turning the host computer off and then back on, which causes a reset of
the motion control board.
PWM
pulse width modulation—a method of controlling the average current in a
motor phase winding by varying the on-time (duty cycle) of transistor
switches.
Q
quadrature counts
The encoder line resolution times four.
R
RAM
random-access memory
relative breakpoint
Sets the position breakpoint for an encoder in relative quadrature counts.
relative position
Destination or target position for motion specified with respect to the
current location regardless of its value.
relative position mode
Treat the target position loaded as position relative to current position while
making a move.
ribbon cable
A flat cable in which the conductors are side by side.
ROM
read-only memory—non-volatile memory used for storing code, programs,
and data.
RPM
revolutions per minute—units for velocity.
RPSPS or RPS/S
revolutions per second squared—units for acceleration and deceleration.
RTR
ready to receive
RTSI
real-time system integration bus—the National Instruments timing bus that
connects devices directly, by means of connectors on top of the devices, for
precise synchronization of functions.
