Microscan MS-96 Uživatelský manuál Strana 204

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Test Decode Rate
A-26 MS-9 Scanner User’s Manual
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 <Cp> command to see the percentage of decodes per
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 A-27).
4. End the test by sending the <J> command.
By ESP
See “Read Rate” on page 12-5.
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
“Formulas for Number of
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
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