SCANTEAM 3700 Wedge Technical Manual
Bit- is a contraction of binary digit," the smallest unit of information used in
data processing.
Buffer- refers to a storage facility in a data communications system which can
compensate for a difference in time or rate of data transmission.
Byte- is a group of 8 bits handled as a unit.
Character (Bar code)- is group of bars and spaces which represents a single
number, letter, mark or other graphic element.
Check Character or Digit- is a special character which is part of the bar code
and can be generated by an algorithm, and used to insure data integrity. When
transmitted, the same algorithm can be used by the host on the data characters
and this independent calculation can be compared to the transmitted check
character. This procedure can also be accomplished wholly within the decoder.
Often the check character is not transmitted because it is not a data character.
Codabar Start and Stop Enabled- is a decoder option. When enabled, the
capital letters representing the start and stop characters will be included in the
data message.
Code ID- is a letter that designates the symbology which has been decoded. The
Code ID can be included in the data preamble or postamble to identify the scanned
symbology to the host device. Welch Allyn has a standard set of lower case Code
ID's. These are given in Table 4.2. See also Port ID.
Code 39 Check Character Included- is a decoder option. When enabled with
Code 39 check character required, the check character will be confirmed and
included in the data message.
Code 39 Check Character Required- is a decoder option. When enabled,
Code 39's checksum will be calculated and confirmed for a valid read.
(Host) Computer- is the data system's controlling processor which interfaces
with the decoder (either directly or through a multiplexer) and other system
elements to receive their data outputs and command their functions.
Decoder- (bar code) is a microprocessor based electronic device which translates
the electrical signals from a bar code scanner into recognizable or computer
compatible data.
Decoding Enabled- is a decoder option that allows the decoding of an
individual bar code symbology to be enabled or disabled.
Density (Bar code)- refers to the number of characters in a linear inch of bar
code.
Depth of Field- refers to the range of distances over which a scanner can
accurately digitize barcode. This distance is measured from the front of the
scanner at the exit window and is dependent on code size, contrast, and quality.
Depth of field is equal to the far distance minus the near distance (∆ distance).
