Symbol Technologies MC9000-G - Manual (Page 512)

MC9000-G Product Reference Guide for Embedded Windows® CE .NET GL-14
PING (Packet Internet Groper) An Internet utility used to
determine whether a particular IP address is online. It is
used to test and debug a network by sending out a packet
and waiting for a response.
Print Contrast Signal (PCS) Measurement of the contrast (brightness difference)
between the bars and spaces of a symbol. A minimum PCS
value is needed for a bar code symbol to be scannable. PCS
= (RL - RD) / RL, where RL is the reflectance factor of the
background and RD the reflectance factor of the dark bars.
Programming Mode The state in which a scanner is configured for parameter
values. See Scanning Mode.
Quiet Zone A clear space, containing no dark marks, which precedes
the start character of a bar code symbol and follows the
stop character.
QWERTY A standard keyboard commonly used on North American
and some European PC keyboards. “QWERTY” refers to the
arrangement of keys on the left side of the third row of
keys.
RAM Random Access Memory. Data in RAM can be accessed in
random order, and quickly written and read.
Reflectance Amount of light returned from an illuminated surface.
Resolution The narrowest element dimension which is distinguished
by a particular reading device or printed with a particular
device or method.
RF Radio Frequency.
RFID Radio Frequency Identification. RFID is a system for tagging
and identifying mobile objects such as store merchandise,
postal packages and sometimes living organisms (like
pets). Using a special device called an RFID reader, RFID
allows objects to be labeled and tracked as they move from
place to place.
RFID Reader Device used to read RFID tags.
ROM Read-Only Memory. Data stored in ROM cannot be changed
or removed.
ROM-DOS The name of the licensed Disk Operating System loaded
into the terminal’s flash file system.