Denso AT20B-SM User Manual page 26

 2-point verification
Scan master registration
1) Switch the scanner to the data verification mode and select the RS-232C or USB-COM interface.
The indicator LED lights in green.
2) Use the scanner to scan a master code to be registered. (The scanner operates in the trigger switch operating
mode currently set.)
After the registration of master data, the indicator LED turns blue and then goes OFF.
3) Use the scanner to scan a target barcode. The scanner verifies the barcode read against the master data
registered and then outputs the result.
After a successful read, the indicator LED lights in blue and then turns green, indicating that the scanner is
ready to register new master data.
During the registration procedure above, if the master data has fewer characters than specified (e.g., less than
the specified verification start position), the registration operation aborts with an error. The scanner becomes
ready to register master data again.
Verification retry after mismatch in 2-point verification
The 2-point verification read provides the "Verification retry after mismatch" option that retries verification against
the same master data. Enabling this option with the configuration software (Scanner Setting) readies the scanner
not for registering new master data but for reading a barcode again if the verification result is a mismatch.
Disabling this option readies the scanner for registering new master data after barcode reading, no matter what
the verification result is.
Note: Any of the following events clears the master data stored in the scanner.
- Turning the scanner power off.
- Modifying the verification start position or the number of characters to verify.
- Customizing the scanner by modifying the parameters with the configuration software
(ScannerSetting) or by reading a batch-process Barcode symbol.
Note: The data verification area can be selected from "Code type + code data" or "Code data only" with
the configuration software (Scanner Setting).
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