Microscan MS-9 User Manual page 204

Test Decode Rate
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>
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
4. End the test by sending the
By ESP
See
"Read Rate" on page
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.
Variations between symbols are common. For this reason, the greater number of
Note
:
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
A-26
MS-9 Scanner User's Manual
command to see the decodes per second.
<Cp>
"Formulas for Number of Decodes" on page
<J>
12-5.
command to see the percentage of decodes per
command.
"Formulas for Number of
A-27).