Microscan MS-4X Instrukcja Użytkownika Pobierz pdf (Strona 303)

Glossary of Terms

MS-880 Industrial Long Range Scanner User’s Manual A-47

Appendices

Protocol. The rules for communication between devices, providing a means to control

the orderly flow of information between linked devices.

Quiet Zones. Specified “clear” (non printed) areas immediately before and after the

bar code symbol. The area is usually white (for black and white bar code) and at least

10 times the width of the narrowest bar, as measured in thousands of an inch. The

zones can be other than white as long as their densities remain consistent and they

have the required contrast relative to the bars.

RAM. (Random Access Memory) Memory that is lost after power is recycled to the unit.

Raster. Multiple, stacked scans produced by a separate oscillating mirror or by a

spinning mirror with varying facet angles.

Read Cycle. A programmed period of time or condition during which the scanner will

accept bar code label input.

Read Range. The distances in which a label can be reliably read, as measured from

the front of the scanner. See “Depth of Field.”

Relay. An electrical switch that allows a low power to control a higher one.

Reset. Sets all counters to zero.

Rising Edge. A change of state (to active) that initiates (and in some cases ends) a

read cycle with a new trigger, an edge trigger, or the leading edge of a level trigger.

(See Falling Edge.)

ROM. (Read Only Memory) Memory that cannot be changed.

Scanner. A scanning device that is comprised of a scan head and a decoder inte-

grated in one package.

Scan Rate (SR) The number of decodes per second that a given scanner is capable of

casting.

Scan Width (SW) is the width across the scan beam at a given distance from the

scanner in which a label can be read.

Send. Transmit data from one device to another.

Separator. A character that separates data fields.

Serial Commands. Online data strings such as <D> or <P> sent from a host or aux-

iliary terminal to a scanner or other device.

Serial Configuration (Host Configuration). Serial command specifically for changing

configuration and distinguished from operational command by the fact that they mod-

ify the non-volatile for power up configuration.

Skew. Label (or scanner) rotation around the center of the skew axis.

Slave Scanner. Linked to the master or preceding scanner in a daisy chain and relays

bar code data to the host. See “Daisy Chain.”

Specular Reflection Zone. The narrow zone straight out from the scanner in which

direct reflected light from a label can distort the scanner’s ability to distinguish bars

from spaces.

Supplemental. A character or data string that is appended to the main bar code

symbol.

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