Rules Hierarchy (In Bar Codes); Default Rules - Motorola Symbol LS3408 Product Reference Manual

Rules Hierarchy (in Bar Codes)

The order of programming individual rules is important.The most general rule should be programmed last.
All programmed rules are stored in a buffer. As they are programmed, they are stored at the "top" of a rules list. If
three rules have been created, the list would be configured as follows:
Third Rule
Second Rule
First Rule
When data is scanned, the rules list is checked from top to bottom to determine if the criteria matches (and
therefore, if the actions should occur). Input is modified into the data format specified by the first matching set of
criteria it finds. Be sure that the most general rule is the last one programmed.
For example, if the THIRD rule states:
When scanning a bar code of any length, send all data, then send the ENTER key.
And the SECOND rule states:
When scanning a Code 128 bar code of length 12, send the first four characters, then send the ENTER key,
then send all remaining data.
If a Code 128 bar code of length 12 were scanned, the THIRD rule would be in effect. The SECOND rule would
appear to not function.
Note also that ADF rules are actually created when the standard data editing functions are used. Scan options are
entered as ADF rules, and the hierarchy mentioned above also applies to them. For the scanner, this applies to
prefix/suffix programming in the parameter Scan Data Transmission Format.
These rules reside in the same "rule list" as ADF Rules, so the order of their creation is also important.

Default Rules

Every unit has a default rule to send all scan data. Units with custom software may have one or more default rules
burned in. The rules hierarchy checks user programmable rules first, then the default rules. Default rules can be
disabled by entering the following general rule in the user programmable buffer:
When receiving scan data, send all data.
Since this rule always applies, ADF never goes into the default rules.
Advanced Data Formatting 14 - 5