Microscan MS-2 User Manual page 118

Glossary of Terms
Good Read — A decode. The successful scanning and decoding of the information
encoded in a bar code symbol.
Half Duplex — A communications system in which signals can travel between devices in
both directions, but not simultaneously.
Host — A computer, PLC, or other device that is used to execute commands and process
data and discrete signals.
Image Sensor — A device that converts a visual image to an electrical signal; a CCD, for
example.
Initialize — Implement serial configuration commands into the reader's active memory.
Input — A channel or communications line. Decoded data or a discrete signal that is
received by a device.
Ladder Orientation — A linear symbol orientation in which the bars are parallel to the
symbol's direction of travel.
Light-Emitting Diode (LED) — A semiconductor device that emits light when conducting
current.
Lens — A transparent piece of material with curved surfaces which either converge or
diverge light rays.
Multidrop — A communications protocol for networking two or more readers or other
devices with a concentrator (or controller) and characterized by the use of individual
device addresses and the RS-485 standard.
Normally Closed — A discrete output state that is only active when open.
Normally Open — A discrete output state that is only active when closed.
Object Plane — An imaginary plane in the field of view, focused by a reader's optical
system at the corresponding image plane on the sensor.
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
Scanner
Reader
A-16
Skew
Tilt
axis
Tilt
Pitch
Pitch
axis
Scan line
MS-2 CCD Reader User's Manual