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Chapter A Appendices

MS-3 Laser Scanner User’s Manual A-31

A–Appendices

nect with a host and—using the RS232, RS422, or RS485 standards—pass data and

serial commands from one device to another.

Initialize. Implement serial configuration commands into the scanner’s active memory.

Input. A channel or communications line. Decoded data or a discrete signal that is

received by a device. See Output.

Intercharacter Delay. The time interval in milliseconds between individual charac-

ters transmitted from the scanner to the host.

Intercharacter Gap. The extra space between the last element of one character and

the first element of the adjacent character of a specific symbol.

IrDA. Infrared Data Association which promotes interoperable, infrared data intercon-

nection standards.

Label. The physical media on which a bar code symbol is presented.

Ladder Symbol Orientation. A bar code symbol in which the bars are parallel to the

symbol’s direction of travel.

Large Intercharacter Gap. Allows the scanner to read symbols with gaps between

bar code characters that exceed three times (3x) the narrow element width.

Laser Framing. Setting scan width size by adjusting the on/off duration of the laser

beam.

Laser On/Off. When enabled, the laser is ON only during the read cycle, provided

the scanner is enabled for a Serial or External trigger.

LED. Light emitting diode.

Level. The condition in which a read cycle initiated by a trigger signal from an object

detector remains active and ends when the object moves out of the detector’s range.

Longitudinal Redundancy Check (LRC). An error-checking routine that verifies the

accuracy of transmissions.

Master Symbol. A symbol or symbol data that is stored in a bar code scanner or 2D

reader’s memory and is compared with subsequently scanned symbols.

Master Scanner. First scanner in a daisy chain mode and linked directly to the host

and in tandem to slave scanners.

Matchcode. The ability to compare symbol data being scanned against a master

symbol that is stored in the memory of the scanner.

Mil. One thousandths of an inch or 0.0254 mm. In bar-coding, a measurement stan-

dard that identifies a symbol by the width of its narrowest element.

Mismatch. An event that occurs when the scanned symbol does not match the mas-

ter symbol that is stored in the memory of the scanner.

Multisymbol. A scanner mode which allows a scanner to read more than one symbol

in a single read cycle.

Multidrop. A communications protocol for networking two or more scanners or other

devices with a concentrator (or controller) and characterized by the use of individual

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