Microscan MS-860 User Manual page 174

Symbol Position Separator
Definition: Inserts a user-defined character between the decoded data and the sym-
bol position data.
Serial Cmd: <K758,raster status,scan position,separator>
Default: Space
Options: Any ASCII character.
Raster/Scan Position by Symbology Type
Symbology Timing
Code 39 Position information
Code 128 is from the first
I2of5 decode of the sym-
Codabar bol.
Code 93 Symbol position
Pharma Code from subsequent
RSS Limited decodes of the same
UPC symbol is ignored.
Position values may
come from different
UPC, supple-
scans and symbols:
mental
Main symbol: First
enabled, and
decode.
both main and
Supplemental: The
supplemental
scan in which both
symbols are
the main and sup-
decoded
plemental are
decoded.
UPC, supple- When both symbols
mental decode in the same
required scan line.
Position values are
averaged over sev-
PDF417 eral scan lines in
which a codeword is
decoded.
Position values are
MicroPDF
for the last scan
RSS14
which allows the
RSS Expanded
symbol to fully
RSS Stacked
decode.
Position values may
be mixed from either
the linear or 2D
Composite
component, and
may come from dif-
ferent scans.
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Raster position
Location of raster
when symbol was Location of symbol within the scan line of the
decoded the first first decode.
time.
The most extreme position (closest to the edge of
scan) from either the main or supplemental.
The most extreme First bar and last bar position values may come
position (closest from different symbols and scans.
to the top or bot- Note: At least one position value is from the first
tom of the raster decode of the main symbol. The other two values
pattern) of either may be from the supplemental. There is no indi-
the main or sup- cation as to which position value corresponds to
plemental. which symbol, but some assumptions can be
made if the symbols are moving in a ladder orien-
tation.
Location of the The most extreme position (closest to the edge
raster when the of scan) from either the main or supplemental.
symbols were First bar and last bar position come from differ-
decoded. ent symbols but the SAME scan.
The average ras- Average first and last bar position.
ter position will Note: If the symbol is moving "fast", position
correspond to the information may tend to "converge" toward the
approximate middle of the raster pattern and scan line. First
"middle" of the and last bar positions will not correlate to row
symbol. width.
These symbologies can sometimes be decoded
even when the scan line does not cross all ele-
ments in one sweep. Therefore, the position
The position of the
information corresponds to the position of the
raster when the
last scanned element that allows the symbol to
symbol fully
fully decode.
decodes.
This is a single point, and therefore, the scan
position data is the same for both the first and
last bar. Example: SP043:043.
The most extreme The most extreme position (closest to the edge
position (closest of scan) from either the linear component or 2D
to the top or bot- component. First bar and last bar position values
tom of the raster may come from different symbols and scans.
pattern) of either If both the linear and 2D component are both
the linear compo- single-point scan positions (example: RSS+
nent or 2D com- MicroPDF), then the net scan position will also be
ponent. a single point.
I/O Parameters
Scan position
10-29