Microscan MS-890 User Manual page 293

Number of Decodes
Note: Because adjustable raster sweeps and scan speeds cannot be synchronized, some
variation in raster height should be anticipated.
Number of decodes (ND) for a raster picket fence symbol is calculated by the following formula:
Example:
Raster Height
If raster arc (in degrees) and symbol range are known, raster height can be derived by the
following formula, where Ø is raster arc in degrees:
Raster Arc
If raster height and symbol range are known, then raster arc Ø can be derived by using the
following formula where RH is raster height:
Note: Raster arc is not presented in degrees in ESP. To convert to degrees, add the Top
Offset to the Bottom Offset and subtract the sum from 255. Enter this as the offset in the
following formula:
MS-890 In dustrial Automation Scanner User Manual
ND = Number of Decodes (total applied to each symbol)
SH = Symbol Height
DR = Decode Rate
RH = Raster Height
SPS = Sweeps per Second
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Appendices
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