Microscan MS-820 User Manual page 199

By Serial Command
1. Position a stationary symbol in front of a functioning scanner at the scan distance
used in your application.
2. Enter a <C> command to see the decodes per second.
The decode rate is the number of decoded scans per total number of scan. It will
appear at the beginning of the data strings.
Note: You can also enter a
scans.
3. Make a note of the decode rate. You will need this when calculating the number of
decodes (see "Formulas for Number of Decodes" on page
4. End the test by sending the
By ESP
See "Read Rate" on page 11-5.
Testing with a Moving Symbol
Before testing with a moving symbol, it is highly recommended that you calculate the
expected number of decodes by using the formulas in
Decodes" on page A-27.
Once you've mounted the scanner, established a good read rate with a stationary sym-
bol, and calculated the number of decodes for your symbol speed, you can begin decod-
ing with moving symbols.
Number of Decodes
To ensure reliable scanning, you need to apply a minimum of five decodes to each sym-
bol. This means that all variables, symbol speed, read range, etc. are significant.
Note Variations between symbols are common. For this reason, the greater number of
:
sample symbols tested, the more likely you are to achieve optimum decode rates.
In general, the number of decodes of a given symbol can be increased by:
• Increasing symbol height
• Decreasing symbol length
• Increasing scan rate (spinning mirror speed)
• Slowing symbol speed
MS-820 Industrial Bar Code Scanner User's Manual
A-26
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<Cp> command to see the percentage of decodes per
<J> command.
"Formulas for Number of
A-27).