Honeywell 2020 - Manual (Page 76)

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No Read
With No Read turned On, the image scanner sends an “NR” to the host if you
pull and release the trigger without reading a code (e.g., bad barcode). If No
Read is turned
Off, the “NR” will not be sent to the host.
If you want a different notation than “NR,” for example, “Error,” or “Bad Code,”
you can edit the output message using the
Data Formatter (page 5-4). The hex
code for the No Read symbol is 9C.
Video Reverse
Video Reverse is used to allow the image scanner to read barcodes that are
inverted. The “Off” barcode below is an example of this type of barcode.
Note: If additional menuing is required, Video Reverse must be disabled to
read the menu barcodes and then re-enabled after menuing is
completed.
No Read On
* No Read Off
Video Reverse On
* Video Reverse Off