SCANTEAM 3700 Wedge Technical Manual
Minimum and Maximum Message Lengths
-refers to how the various
symbologies may be restricted in code length to minimize the chances of
misreading a bar code. By setting the message length, the decoder will count the
data characters plus any others (start/stop, check digit, etc.) and only accept those
bar code reads that fall within the set message length parameters. The default
values of the minimum and maximum message lengths are indicated in section 4.4
under the specific configuration commands for setting the bar code symbologies.
Near Distance
-is the nearest distance that a scanner can accurately digitize a
given bar code.
No Read, Non-read, Non-scan
-is the absence of data at the scanner output
after an attempted scan due to no code, defective code, scanner failure or operator
error.
Non-volatile
-refers to the characteristic of a device which allows it to retain
data in memory when power is lost or turned off.
Optical Axis
-is a line extending from the center of the exit window to the
midpoint of the usable scan length.
Parity
-is a means of checking character bit patterns for validity by confirming
if they contain an Even or Odd number of 1"s.
PLCC
-is an acronym for plastic leaded chip carrier," a type of integrated
circuit package. PLCC components are used in surface mount circuit board
technology.
Port-
refers to the electrical connector on a decoder, computer or other system
component through which data is transmitted or received.
Port ID
-is a number that designates the scanner port from which a bar code
signal has been decoded. The Port ID can be included in the data preamble or
postamble to identify the scanner input port to the host device. The Port ID
numbers are given in Table 4.1. See also Code ID.
Protocol
-refers to a set of procedures for establishing and controlling data
transmissions.
Quiet Area
-is an area of clear space, containing no dark marks, which precedes
the start character of a symbol and follows the stop character. Also known as
Quiet Zone.
RS-232-C
-is a set of rules which govern the transfer of data between Data
Terminal Equipment (DTE) and Data Communications Equipment (DCE),
effected through 25 pin plug-in connectors. This standard applies to both
synchronous and asynchronous transmissions at speeds up to 20K bps (bits/sec) in
full or half-duplex modes.
Scan Enable-
is a scanner input signal that controls the flow of power to the
scanner. Usually this signal will control all the scanning functions in the scanner.
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