254764-001 Rev B 19
Once calibration is successful, re-calibration is not required unless the unit has been moved – either on its
mounting stand or into a new location. It is advised to keep the laser beam exit window clean. Dirt, dust,
fingerprints, etc. on the exit window can affect calibration.
Setup Procedure
It is highly recommended that PRINTRONIX ScanVision be used to set up SV 2 Series units. This
Windows based software is available free of charge from PRINTRONIX. The alternative is to use SV
Command Language through a host computer. See the SV Command Language Section for details.
Installation of an SV scanner/verifier requires proper mounting position, port configuration(s) and LED
configurations to ensure reliable and accurate operation. This section describes the procedures for using
ScanVision to ensure proper SV setup and installation.
Each SV unit has a label showing the specified mounting distance and target scan angle for its particular
scanner. Follow the steps below to ensure the SV unit is properly mounted and programmed.
1.
Mount the SV unit at the proper distance and angle. Use Figure 2 as a reference.
2.
Connect power and communication cables to the SV unit.
3.
Set the SV unit for picket fence bar code travel direction.
4.
Place a sample bar code in the center of the intended laser beam path. For best results, this sample
should match the type of bar code(s) and material that is to be analyzed in the final application.
Knowing the X dimension (narrow element width) of the bar code(s) is a big plus as will be seen in
Step 5.
Note:SV Calibration symbols have a 10 mil X dimension unless otherwise indicated.
5.
Take a Scan Profile with ScanVision.
a.
Ensure the bar code(s) is in the center of the scan path.
b.
Ensure the scan profile contains no distortion from light reflecting from objects in or near the light
path.
Examples of a good and bad reflectance profile are shown in Figures 4a and 4b
respectively at the end of this section.
One major aspect in a good profile is the low reflectance
points (the bars) in the symbol are uniform all the way across the code. Optimum signal amplitude
should be adjusted so the bar code element reflectances are between the 90% and 10% marks
shown in yellow on the screen. Scanner angle has the most effect on the signal amplitude.
c.
Continue adjusting the SV unit’s placement until a good, centered scan profile is obtained. The
scan angle may have to be altered slightly or a light shield may have to be installed in extreme
cases to achieve a good reflectance profile. If adjustment of scan angle does not produce the
correct signal amplitude or placement, adjust scanner gain and offset per the Adjusting Scanner
Gain and Offset Section.
6.
*
Place ScanVision in Session Mode.
a.
Click on the Report an Analysis Speedbutton.
b.
Ensure that X in the lower panel of the Bar Code Analysis Screen matches the X dimension of the
symbol /- .1 mil.
c.
Adjust distance of the SV unit from the bar code until the X dimension matches the desired value.
(If X is analyzed as too large, move the scanner farther away; if X is too small, move the scanner
closer.)
7.
Repeat steps 5 and 6 until no more mounting adjustments are required.
8.
Remove the symbol from the laser beam path.
9.
Program the SV unit’s ports, LED’s, sync mode, etc. (if required).
10.
Calibrate the SV unit if any reflectance parameters (such as symbol contrast) are programmed in this
application to report to a host or activate any ports. Each SV unit is supplied with a calibration symbol.
11.
The SV scanner/verifier is now ready to operate for picket fence bar code travel direction. If Ladder
Mode is being used and the desired scanning length for ladder bar code travel direction is programmed,
place the unit in ladder mode. The unit is now ready to operate. If ladder mode scanning length is to be
programmed, continue with the following steps.
12.
Turn off partial decodes using the ~Lp0 command.
13.
Display additional results in ScanVision through the Advanced Menu.
14.
**
Place a sample of a bar code that is to be analyzed on the farthest position towards the left end of
the laser beam where the code is intended to be scanned.
