Rockwell Automation 2755 AtomScan Bar Code Reader - Manual (Page 90)

6–5 Hardware Operation
Publication 2755-6.9
Note: If you activate the counter command during a read cycle, the
reader will not output the count until the read cycle ends.
•
No Read Counter, [<N>] . The message N/XXXXX displays the
total number of no reads that have occurred since power-on or the
last No Read Counter Reset command.
•
No Read Counter Reset, [<O>] . Sets No Read Counter to 00000.
•
Trigger Counter, [<T>] . The message T/XXXXX displays the
total number of triggers since power-on or the last Trigger
Counter Reset command.
•
Trigger Counter Reset, [<U>] . Sets the trigger counter to 00000.
•
Match Code/Good Read Counter, [<V>] . The message
V/XXXXX displays either (1) the total number of good reads that
match the master label or (2) the total number of good reads, or
decodes. The count begins from the last power-on or Match
Code/Good Read Counter Reset command. To count the good
reads that match the master label, enable Match Code; to count
good reads only, disable Match Code. This counter is always
active and can be requested at any time.
•
Match Code/Good Read Counter Reset, [<W>] . Sets the Match
Code/Good Read Counter to zero.
•
Mismatch Counter, [<X>] . The message X/XXXXX displays the
number of labels successfully read that do not match the master
label since power-on or the last Mismatch Counter command.
•
Mismatch Counter Reset, [<Y>] . Sets the Mismatch Counter to
zero.
Test Commands
•
Enter Decode Rate Test, [<C>] . Instructs the reader to output the
decode rate and label data (if any). (If in a triggered mode, the
reader will output the number of good reads based on the number
of accepted triggers received.) The decode rate can vary
dramatically due to the angle and location of the label in relation
to the scan beam (or scan line, if using a scan head with a moving
beam). This test is very useful in aligning and positioning the
scanning device during installation.
•
Enter Extended Decode Rate Test, [<Ce>] . Instructs the reader to
output decode rate, label data (if any), reflectance threshold, and
number of label space transitions. This test is necessary to
determine how to set Minimum Label Transitions and
Reflectance Threshold.
•
Exit Decode Rate Test, [<J>] . Ends both the decode rate test and
the extended decode rate test.
Note: It is not necessary to use the <J> command while
switching between the decode rate test and the extended decode
rate test.