Microscan MS-4 User Manual page 364

Glossary of Terms
Output — A channel or communications line. Data or discrete signals that are transmitted
or displayed by a device.
Parity — An error detection routine in which one data bit in each character is set to 1 or 0
so that the total number of 1 bits in the data field is even or odd.
Picket Fence Orientation — A linear symbol orientation in which the bars are perpendicular
to the symbol's direction of travel.
Pitch — Rotation of a linear or 2D symbol around an axis parallel to the symbol length on
the Substrate. See the illustration below.
axis
Bar code
label
Symbol or
other object
of interest
Scanner
Reader
Pixel — An individual element in a digitized image array; "picture element".
PLC — See Programmable Logic Controller.
Port — Logical circuit for data entry and exit. (One or more ports may be included within a
single connector.)
Processing Time — The time used by a vision system to receive, analyze and interpret
image information. Often expressed in "parts per minute".
Programmable Logic Controller (PLC) — An electronic device used in industrial automation
environments such as factory assembly lines and automotive manufacturing facilities.
Progressive Scan — A non-interlaced scan that doubles the number of visible picture
lines per field by displaying all picture lines at once.
Protocol — The rules for communication between devices, providing a means to control
the orderly flow of information between linked devices.
RAM — See Random Access Memory.
Random Access Memory (RAM) — A data storage system used in computers, composed
of integrated circuits that allow access to stored data in any sequence without movement
of physical parts.
Read Cycle — A programmed period of time or condition during which a reader will accept
symbol input.
Read-Only Memory (ROM) — A data storage medium used in computers and other elec-
tronics, primarily used to distribute Firmware.
Real-Time Processing — In machine vision, the ability of a system to perform a complete
analysis and take action on one part before the next one arrives for inspection.
A-32
Skew
Tilt
axis
Tilt
Pitch Pitch
axis
Scan line
MS-4 Imager User's Manual