Central Reading - Opticon MDI-4000 Series Serial Interface Manual

MDI-4000 Series Serial Interface Manual
barcode from being read twice, the scan engine saves the barcode data in memory (up to 20
barcodes). When subsequent barcodes are read, the scan engine compares the data with the
data in memory and ignores the data if it has been previously read. This read mode can be
helpful to prevent reading the same barcode twice.
Note: Because the maximum number of barcodes that the scan engine can keep in memory is
20, after 20 different barcodes are read, the same barcode can be read again.
Example of Multiple Read Mode 1:
The scan engine will read both Code 1 and Code 2 with a single trigger press.
Multiple Read Mode 2 (Reads Duplicate Data)
Just like Multiple Read Mode 1, the scan engine starts reading after a trigger press and keeps
reading (even after a barcode is successfully decoded) until the read time expires. In Multiple
Read Mode 2, the scan engine reads the same barcode in a single trigger press if one of these
conditions are met:
•
The duplicate barcodes are separated by at least one other barcode.
•
The Double Read Reset Time has passed. For more information, see
Reset Time" on page
Example of Multiple Read Mode 2:
The barcode 0001 is read twice, because the duplicate barcodes are separated by at least one
other barcode.
8.1.2

Central Reading

To help you read barcodes that are positioned close to each other, enable Central Reading.
When Central Reading is enabled, the scan engine only reads the barcode in the center position
of the reading area.
Central Reading Commands
Command Description
[D00 Enable central reading: only read barcodes in the center position of
the aiming LED
[D0Z Disable central reading: read all barcodes in the reading area
92
94.
"Double Read
Default
✓