Test Commands - Allen-Bradley 2755-LS7-SB User Manual

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>]
total number of no reads that have occurred since power-on or the
last No Read Counter Reset command.
•
No Read Counter Reset,
•
Trigger Counter,
[<T>]
total number of triggers since power-on or the last Trigger
Counter Reset command.
•
Trigger Counter Reset,
•
Match Code/Good Read Counter,
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,
Code/Good Read Counter to zero.
•
Mismatch Counter,
[<X>]
number of labels successfully read that do not match the master
label since power-on or the last Mismatch Counter command.
•
Mismatch Counter Reset,
zero.

Test Commands

•
Enter Decode Rate Test,
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,
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,
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.
Hardware Operation
. The message N/XXXXX displays the
. Sets No Read Counter to 00000.
[<O>]
. The message T/XXXXX displays the
. Sets the trigger counter to 00000.
[<U>]
. The message
[<V>]
. Sets the Match
[<W>]
. The message X/XXXXX displays the
. Sets the Mismatch Counter to
[<Y>]
. Instructs the reader to output the
[<C>]
. Instructs the reader to
[<Ce>]
. Ends both the decode rate test and
[<J>]
6–5
Publication 2755-6.9