Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 136)

Chapter
10
Publication 2755-833
Configuration: Host Message
Replacement Rules
Function 5 on the Select Operation menu accesses the Host
Message Replacement Rules configuration screen. Use this
function to modify the message sent to the host.
Host message replacement rules may not be required in every
application. They are unnecessary when your needs include simple
object counting, or collection of raw bar code data. However, host
message replacement rules will prove useful when you need to
substitute a predetermined output message for specific bar code data
during decoding. With them you can:
•
send data in a particular, predefined order regardless of the order
in which the labels were read
•
mask bar code characters to simplify operations and speed
processing
•
truncate or pad the length of the data package
•
substitute a predetermined text string for one or more expected
values.
•
convert abstract bar code contents into more easily understood
text form
•
categorize labels based upon selected portions of their contents.
Both the search and replacement strings that make up a Host
Message Replacement Rule can consist of a combination of standard
ASCII characters and special characters known as metacharacters.
Metacharacters are explained later in this section.
Introduction to
Host Message
Replacement Rules