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MS-7180
Ladder Calculation
Ladder scanning is rarely done with raster scanners and when it is, it is gener-
ally done with a stop and go label. In such a situation the number of scans is
equal to the scan rate times the number of seconds the label pauses under the
raster image (adjusted by the ratio of raster height to label height).
Picket Fence Calculation
For picket fence raster scanning, number of scans (NS) is arrived at by first
solving for sweeps per second (SPS).
Sweeps per Second (SPS) is the user-programmable number of raster
sweeps that transpire in a second. A sweep is defined as a single pass, up
or down, describing the raster image. Sweeps per second should generally
be as few as possible in order to maximize the number of scans applied to a
given label and to minimize wear on the raster parts and vibration to the
scanner.
The formula for finding Sweeps Per Second (SPS) is as follows:
SPS
Since SPS can only be entered into the software (see
on page
2-37) as whole numbers, round off fractions of SPS to the next
higher number, for example enter 0.4 as 1 and 3.5 as 4.
Number of Scans (NS) be calculated by the following formula:
NS
Example: If SW = 10, LL = 2, and LS = 2, then SPS will equal 0.5. Since 0.5
is less than one, we will assign a value of one in the Sweeps per Second
option as described in
"Raster Setup Menu" on page 2-37
mula which (with LH = 1, SR=400, RH = 10, and SPS = 1) calculates out to
37 complete scans.
1. The number 2 in the SPS formula is a constant that doubles the number of sweeps to
ensure that each label receives two full raster sweeps.
2. The -3 component is added to allow for AGC acquisition and for incomplete first and
last scans. This applies only if the calculation in the brackets is 3 or more. If it equals 2,
then subtract only 1, giving 1 good scan.
MS-7100/7180 Industrial Scanner User's Manual
Calculate Number of Scans
×
2
LS
=
------------------------- -
(
)
SW LL
–
"Raster Setup Menu"
×
LH
SR
=
------------------------ - 3
–
×
RH
SPS
1
2
and in the NS for-
1-7
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