Cognex In-Sight 1721, Руководство пользователя

Страница: 35 / 156

In-Sight
®
1700 Series Wafer Reader Section 3: Configuring a Wafer ID Application
NOTES
■ Speed is the default Optimization setting that is used for compatibility with all previous versions of
the In-Sight wafer reader.
■ The read score may vary depending on the Optimization setting; verify that the Accept and Char
Threshold settings correspond to the selected Optimization setting.
BC, Compress Advanced Dialog
When ‘BC, BC 412’ or ‘BC, IBM 412’ is the selected Mark, the Advanced dialog can be
accessed from the Advanced button (see Figure 3-5).
Figure 3-5: BC, Compress Advanced Dialog
The Compression drop-down list specifies options for decoding compressed barcodes,
including Base 35 compression, as well as a selection for decoding a barcode with no
compression.
When one of the Compressed options (Compressed 1 to Compressed 8) is selected,
Report settings are also available. If Hyphen is enabled, the last two digits of the
barcode string are separated by a hyphen. If Three Digit is enabled, the digits that are
encoded for the wafer lot number are replaced by a three-digit number; zeros (0) are
used as place-holders if the lot number is less than three digits. For example, if the
encoded lot number is “12”, the lot number would be reported as “012”. Report settings
are ignored if ‘None’ is the selected Compression.
NOTE For specific information on the customized decoding options, please contact your Cognex Sales
Engineer.
3.5.5 Checksum
The Checksum setting selects the method by which the read result from a character
string will be validated to ensure reliability, and establishes the scoring basis for
determining the pass/fail status of the read.
NOTE The Checksum setting is enabled and used only when ‘Chars, SEMI’, or ‘Chars, Triple’ is the
selected Mark. When any other Mark is selected, the Checksum setting is ignored.
25