
B-63322EN-2/01 12. CUSTOMER'S BOARD MANIPULATION
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•
••
• UPDATE
This box indicates whether message data display update has started or
ended.
Message function manipulation
•
••
• Presetting
Pressing the [POINTER PRESET] soft key sets both the top and
bottom addresses to the start address of the buffer area.
•
••
• Display updating
Pressing the [UPDATE START] soft key causes the message display to
be updated.
Pressing the [UPDATE STOP] soft key causes the message display
update to be stopped.
Buffer storing continues, however.
(Display processing is stopped, but buffer storing is not.)
Storage area
The BUFFER AREA boxes indicate where message data is stored.
The buffer area is used in a ring manner. When there is no free space in
the buffer area, a new data item is written over the oldest data item, thus
discarding the oldest data item.
Old data is discarded in line units.
The TOP box displays the address where the next message data item is
to be stored.
The BOTTOM box displays the address where the oldest message data
item is stored.
•
••
• Example
0x02b00000
Space used
Start of buffer
area
Space yet to be
used
Top
Bottom
0x02bfffff
Space used
End of buffer
area