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G
LOSSARY
11
Solutions with Vision
Parameter
A value or opinion that you specify to a program. A parameter is sometimes called a switch or an argument.
Parity Bit
A bit that is set at “0” or “1” in a character to ensure that the total number of 1 bits in the data field is even or odd.
Percent good reads
The number of successful reads per refresh period. This is valid only when the refresh period is set to 0.
Performance indicator
A bar code decoder function that counts the number of decodes during a trigger period. When the period = 0, the
performance indicator provides the number of decodes (up to 100 attempts). Use the performance indicator to
provide a general indication of bar code symbol quality or verify proper setup of the scanner.
Performance indicator limit
A set point that will produce a discrete output if the performance indicator falls below the set point value.
Pen Scanner
A pen-like device either connected by wire to a device, or self-contained, used to read bar codes. Requires direct contact with the
symbol.
Peripheral Device
An internal or external device, such as a printer, a disk drive, or a keyboard, connected to a computer.
Photoeye
Used as a presence detector to identify objects in the scanner’s reading zone. The photoeye emits a beam and is used with a
reflector to create a photoelectric circuit. When the beam is blocked by an object, breaking the circuit, a signal called CART is
sent to the scanner.
Picket Fence Orientation
When the bar code’s bars are positioned vertically on the product, causing them to appear as a picket fence. The first bar will
enter the scan window first.
Pitch
Rotation of a code pattern about the X-axis. The normal distance between center line or adjacent characters.
Polarized Laser
A specialized laser source used in high glare environments.
Polling
A means of controlling devices on a multipoint line.
Protocol
A formal set of conventions governing the formatting and relative timing of message exchange between two communicating
systems.
Pulse Width
A change from the leading edge of a bar or space to the trailing edge of a bar or space over time. Pulse width is also referred to as
a transition.
Queue
A buffer used to hold data in order until it is used or transmitted.
Quiet Zone
Required distance before the first bar and after the last bar of the code that must be free of marks or printing.
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