Rockwell Automation 2755-G6-D Scanner with RS-232 Option - Manual (Page 39)

General Setup Parameters
Chapter 5
5–5
Capture Count determines the number of successful,
identical decodes that must occur for a valid read.
You can use the capture count to enhance the security
of the bar code reader.
Option BC sets the capture count to 1 which requires
one successful decode.
BC Capture Count = 1 *
Scan option BD to set the capture count to 2. Two
identical decodes must occur for a valid read.
BD Capture Count = 2
Because the laser scans a label many times a second,
you will notice little or no change in the speed of the
decode.
Capture
Count