Accu-Sort AXIOM 400 Product Manual Download

Page: 115 / 132

AXIOM™ 400 Product Manual

Glossary

C-7

A3-AXIOM400-Glossary_R10.doc

Accu-Sort Systems, inc.

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.

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 (trigger) to identify objects in the bar code
reading zone. The photoeye emits a beam and is used with a reflector to
create a photoelectric circuit. When an object blocks the beam, breaking
the circuit, a signal called TRIGGER is sent to the reader.

(See also:

emitter/receiver pair.)

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.

port

Refers to the physical connections located on the Axiom and other devices.
The Axiom ports include: INPUT and OUTPUT POWER, TRIGGER, TACH, COM
(serial and Ethernet), I/O (1-4).

protocol

A formal set of conventions governing the formatting and relative timing
of message exchange between two communicating systems.

Pulses Per Inch (PPI)

Defines the number of pulses per inch of transport travel as provided by
the tachometer.

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.

Radio Frequency Identification Device, RFID

Non-optical automatic identification devices that use radio waves to
transmit data.

read-only

A read-only file is one that you are prohibited from editing or deleting. A
file can have read-only status if:
  •  Its read-only attribute is enabled.
  •  It resides on a physically write-protected diskette.
  •  It is located on a network in a directory to which the system

administrator has assigned read-only rights to you.

read range, read zone

Anywhere the reader can “see” and decode bar codes. The usable length of
the scan line throughout the depth of field (DOF) perpendicular to the DOF.
Any codes that appear too close or too far away from the reader are
considered outside the read zone. Also referred to as

scan window

reflectance

The amount of light returned from an illuminated surface.

relative reader angle

The mounting angle of the reader as it relates to the conveyor surface and
direction of travel.

relay

Relays are simply electrical switches that are typically used to control
external diverts, alarms, etc. Relay types available are FORM A and FORM
C. FORM C type relays have both normally open and normally closed
contacts available while FORM A type relays have only normally open
contacts available.

relay output duration

This is the time (in seconds) after the relay is energized that it should be
turned off.

relay output delay

The time lapse between an event and the energizing of the relay.

Request To Send (RTS)

An RS232 modem interface signal which indicates that the DTE has data
to transmit.

resolution

The narrowest element dimension which can be distinguished by a
particular reading device or printed with a particular device or method.

response time

The elapsed time between the generation of the last character of a
message at a terminal and the receipt of the first character of the reply. It
includes terminal delay and network delay.

retroreflective pair

An emitter bounces a light beam off the reflector and detects when the
beam is broken. Often referred to as a photoeye or PE. Typically used as a
TRIGGER.

ROM

The acronym for read-only memory. The computer contains programs
essential to its operation in ROM. A ROM chip retains its contents even
after you turn off your computer.

RPM

The abbreviation for revolutions per minute.