Understanding
Data Transmission
When a decoded bar code scanner reads a bar
code, it interprets the bar code symbol and sends
it in digital form to the receiving device in the form
of an ASCII character that the symbol represents.
With a wedge scanner, the code is received as if it
were typed on a keyboard.
Many applications require or can be simplified by
transmitting other characters with the decoded
bar code data. These additional character
command the computer to take some action.
Skipping a line (line feed command), adding text
to the transmitted data, or taking another brand in
its programming sequence are some example of
what could be one by adding characters before
(prefixes) or after (suffixes) the decoded data.
This scanner allows these additions in the wedge
mode only. The generalized data transmit format
is:
time - - >
PREFIX
CODE
ID
DATA
SUFFIX
-1
SUFFIX
-2
SUFFIX-1 is used for cursor control and can be
added independently of the symbology in use
whereas the
PREFIX and SUFFIX-2 options are
programmed per symbology and will only have an
effect on the symbology they are programmed for.
Therefore, a symbology identifier must be
programmed prior to their addition.
Page 5
