PSC PowerScan - Manual (Page 129)

Programming Guide 123
Set Second Fixed Length - instructs the scanner that the next
two programming labels scanned will define the second fixed
label length. This setting must be between 04 and 16
characters.
No Second Fixed Length - configures the scanner to recognize
only the label length chosen as the first fixed length.
Read Verification Read Verification is the number of times the scanner is required to read
the bar code data before sending the label data to the host.