Rockwell Automation 2755 AtomScan Bar Code Reader - Manual (Page 93)

6–8 Hardware Operation
Publication 2755-6.9
•
Show Software Status, [] . Sends the following in this order:
status byte, part number, ROM checksum for both possible
lengths of ROM (1 megabyte and 512 bytes), NOVRAM
checksum at power up, then the current NOVRAM checksum.
Note: Continuous Read, 1 Output or Match Code will change the
current NOVRAM checksum.
Master Label Commands
•
Enable Match Code Option, [] . Identical to match code
command. Instructs the reader to compare bar code labels being
scanned with a master label that has been entered in nonvolatile
or volatile RAM, and may under certain conditions send out a
relay driver signal and update internal counters.
If no master label has been entered, every decoded label will be a
“mismatch” and will increment the mismatch counter by one.
Enable Match Code Option is intended for use when the reader is
in a triggered mode. If the Match Code option is enabled in the
Continuous Read mode, the reader defaults to Continuous Read, 1
Output mode, and the label data must change before the reader
will output data again, unless a timeout, if enabled, occurs.
•
Disable Match Code Option, [] . Disables Match Code.
•
Store Next Label Scanned as Master Label, [] . Causes the
reader to read the next bar code label scanned as the master label
if Match Code has been enabled. All subsequently decoded
labels are compared against the master label information stored in
RAM.
•
Download Master Label Information, [<)XXXX)>] . Downloads
master label information from the host or a terminal. The master
label information can be downloaded at any time, and can be
saved in nonvolatile memory with a command. A stored
master label will not affect standard operation unless Match Code
option is enabled.
•
Request Master Label Information, [<)>] . Immediately sends
the master label information to the host. To prevent conflicts
with outputting label data, press
[] , Disable Laser Scanning
command.
Note: If the master label information has previously been stored in
nonvolatile RAM (by a command), cycling the power will
restore that information.
•
Delete Master Label Information, [<))>] . Deletes master label
information that has previously been loaded by either <)XXXX)>
Download Master Label Information Command or Store
Next Label as Master Label command.