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6/08 ST 3000 Release 300 and SFC Model STS103 User’s Manual 61
6.2 Overview, Continued
SFC and ST 3000
transmitter memories
Both the SFC and the ST 3000 transmitter have working memories as
shown in Figure 24. They serve as temporary storage areas for data
exchanged between the SFC and the transmitter during communications.
The transmitter also has a non-volatile memory as the permanent storage
area for a backup copy of all the data held in the working memory. This
memory retains its data even if the transmitter loses power.
The SFC has a second temporary storage area called the hold memory.
This memory supports the SFC’s save and restore functions. It serves as
the temporary storage area for a configuration database saved from a
transmitter until it can be restored in a transmitter. Data in this memory
can not be displayed or altered, and it will be lost if the SFC is turned off.
Figure 24 shows the working relationship between SFC and transmitter
memories during communications.
Figure 24 SFC and ST 3000 Transmitter Memories.
Working
Memory
Working
Memory
Non/Volatile
Memory
Hold
Memory
ST 3000
SFC
Continued on next page