Aerotech SOLOIST Hardware Manual page 104

Glossary of Terms
A-8
Range
RDC
Repeatability
Resolution
Retroreflector
Roll (of travel)
Roll Error
Rotor
RS-232C
RS-274
RS-422
Runout
Servo System
Soloist Hardware Manual
The maximum allowable travel of a positioning stage.
Resolver to Digital Converter. Electronic component that
converts the analog signals from a resolver (transmitter
type) into a digital word representing angular position.
The maximum deviation from the mean (each side) when
repeatedly approaching a position. Unidirectional
repeatability refers to the value established by moving
toward a position in the same direction. Bidirectional
repeatability refers to the value established by moving
toward a position in the same or opposite direction.
The smallest change in distance that a device can
measure.
An optical element with the property that an input light
beam is reflected and returns along the same angle as the
input beam. Used with laser interferometers.
Angular motion of a carriage around an axis parallel to
the motion direction and perpendicular to the yaw axis.
Positioning error resulting from a roll motion.
The rotating part of a magnetic structure. In a motor, the
rotor is connected to the motor shaft.
Industry standard for sending signals utilizing a single-
ended driver/receiver circuit. As such, the maximum
distance is limited based on the baud rate setting but is
typically 50-100 feet. This standard defines pin
assignments, handshaking, and signal levels for receiving
and sending devices.
Industry standard programming language. Also referred
to as G-code machine programming. A command set
specific for the machine tool industry that defines
geometric moves.
Industry communication standard for sending signals
over distances up to 4000 feet. Standard line driver
encoder interfaces utilize RS-422 because of the noise
immunity.
The deviation from the desired form of a surface during
full rotation (360 degrees) about an axis. Runout is
measured as total indicated reading (TIR). For a rotary
stage, axis runout refers to the deviation of the axis of
rotation from the theoretical axis of rotation.
Refers to a closed loop control system where a command
is issued for a change in position and the change is then
verified via a feedback system.
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