Printronix SL5000r User Manual page 61

SN Threshold
This menu item sets the SN (signal to noise) threshold used by the validator to
discriminate between high peak noise and actual bar code transitions. Any reflectance
transitions that are below the threshold are ignored and considered noise.
You can set the SN Threshold to a value from 5 to 199.
The default is 70.
1. Press
2. If necessary, press and
3. Press
4. Press until SN Threshold displays.
5. Press + or – to scroll through the values: 5 to 199.
The default is 70.
6. Press
7. Press  and
printer offline.
8. Press PAUSE again to put the printer online.
Min. Read Scans
This menu item sets the minimum number of scans per bar code that must be read. If
less than the minimum number is read, then the "Unscannable / xx Missing Codes" error
message is generated.
To ensure that the validator accurately validates the bar codes, set the Min. Read Scans
value to 75% of the number of scans possible per bar code (rounded down).
Use this formula to determine the number of scans possible per bar code in relation to
print speed and bar code height:
100 x Bar Code Height In Inches
Print Speed (Inches Per Second)
Set Min. Read Scans to 75% of the Number of Scans Possible value.
IMPORTANT If you have more than one bar code on the form, use the shortest bar code for the
calculation.
Example
For a 0.5 inch tall bar code printing at 4 inches per second:
100 x 0.5
Set Min. Read Scans to 75% of 12, which is 9.
. .
. to take the printer offline and place the printer in Menu mode.

at the same time to unlock the
. .
. until VALIDATOR displays.

to select the desired value.

at the same time to lock the
12 Number of Scans Possible
=
(rounded down)
4

key, then press PAUSE to take the
Number of Scans Possible
=
(rounded down)

key.
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