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Accu-Sort Systems
Radio Frequency
Non-optical automatic identification devices that use radio waves to transmit data.
Raster
The process of projecting the laser beam at varied angles spaced evenly from each other. Typically, the mirror wheel surfaces are
angled to create multiple scan lines instead of a single beam.
Raster Mirror Wheel
The standard mirror wheel forms the laser line that is projected from the scanner. Although the mirror wheel projects 8 separate
lines (for an 8-sided mirror wheel), the speed of the sweep makes it appear that it is actually one line. This type of mirror wheel is
adequate for a ladder orientation because the laser line will pass from the bottom to the top of the code. For a picket fence
orientation the standard mirror wheel is not always adequate. One problem facing the picket fence orientation is that the same
portion of the code is being repeatedly scanned. If the printing quality at this point is not good the label may not be scanned even
though other parts of the label are good. Another problem for a picket fence orientation is the placement of the label. If the
placement is off enough a single scan line will not read all the bar codes presented to the scanner.
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 Zone
Area in front of the scanner’s window in which the bar code should appear for scanning. This zone consists of the scan window
and the raster width (if used).
Reflectance
The amount of light returned from an illuminated surface.
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.
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.
RS-232
Interface between data terminal equipment and data communication equipment employing serial binary data interchange.
RS422
The Electronic Industries Association standard that specifies the electrical characteristics of balanced voltage digital interface
circuits.
RS485
The Electronic Industries Association standard that specifies the electrical characters of generators and receivers for use in
balanced digital multipoint systems.
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