Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 36)

3–6 Overview of Decoder Operations
Publication 2755-833
Operating Memory
The decoder uses configuration parameters as they exist in operating
memory to perform all functions. Initially set to factory defaults,
these parameters can be changed using the AUX terminal
configuration and ASCII or PCCC host commands. With the
exception of specific host communication parameters (See Chapter
12), all parameters take effect immediately when changed
①
You can use the Default command to reset the operating memory to
factory defaults. The Save command will copy the contents of
operating memory into storage memory. When you issue a Recall,
the decoder copies the Saved parameters from storage memory into
operating memory.
The decoders are designed to retain configuration in operating
memory even during short term power interruptions. Refer to
Chapter 2 for information about memory backup.
Storage Memory
Within the decoder there is permanently stored a copy of the factory
default configuration parameters. You cannot modify this copy, but
can copy them into the operating memory at any time using the
Default command.
In addition, the decoder can retain in storage memory a copy of the
configuration parameters you have set. You can use the Save
command to copy the operating memory into storage memory. The
Recall command copies the contents of storage memory back into
the operating memory. You will find this capability useful for
troubleshooting custom configurations, for making temporary
changes on-line, and for use with Autoload and Lot.
The Autoload parameter (in either the Primary or Extended Match
Code Table) and the Lot parameter (in the Extended Match Code
Table) allow the decoder to take scanned symbol data and load it into
the match code table. The Restart command will reset these
parameters to the originally Saved parameter so that new values can
be loaded.
①
The parameters that do not change until they are saved and the decoder is restarted, involve host commu
would be disruptive to change host communications parameters while data transmission was in process.
communications parameters are loaded into operating memory from storage memory during restart.