Configuring The List Memory - Scanlab RTC 5 PC Interface Board Installation And Operation Manual

6.3.2 Configuring the List Memory

For compatibility, SCANLAB preconfigures the
®
RTC 5's list buffer area such that "List 1" and "List 2"
can each accept 4,000 list commands. The protected
"List 3" then owns the remaining 1040576 of the 2
storage positions (see Configuration (a) in
Users can also reconfigure the buffer area via the
command config_list (see page
an application only needs one list, then the RTC
entire memory can be treated as a single list with a
20
total capacity of 2 positions (see Configuration (e)
in figure 27). In this case, the single list ("List 1") can
20
be loaded with up to 2 commands. The buffer areas
will generally be configured so that "List 1" will
occupy the lower positions, "List 2" the intermediate
positions, and "List 3" the uppermost positions.
When configuring the buffer areas, note that "List 1"
must contain at least one storage position and that
the total sum of storage positions for "List 1" and
20
"List 2" must not exceed 2
sizes of "List 1" and "List 2" can be configured as
desired (e.g. 0 positions for "List 2", see Configu-
ration (d) or (e) in figure 27). During configuration,
the protected "List 3" buffer area automatically
receives remaining memory not assigned to "List 1"
or "List 2".
The configuration process does not alter the contents
of the buffer memory. Repeating the call with
differing parameters is therefore nondestructive.
When subsequently altering the configuration, you
should observe the following:
• List boundaries should not be moved to within an
eventual subroutine.
• If a "List 3" region is assigned to the list area
("List 1" or "List 2"), the region's protection will
be removed.
• Valid jump addresses specified in jump
commands might become invalid if the configu-
ration is altered (see "Jumps", page
• If the protected buffer area ("List 3") is made
larger, defragmentation might be needed to
make the newly assigned memory area usable
(see "Index Management and Defragmentation"
on page 79).
®
RTC 5 PC Interface Board
Rev. 1.9 e
6 Developing User Applications
20
figure 27).
243). For example, if
®
5's
. Other than that, the
81).
20
2 -1
3
3
2
8000
7999
2
1
4000
3999
1
0
(a) (b)
1 "List 1" (list buffer)
2 "List 2" (list buffer)
3 "List 3" (protected buffer area)
(a) Standard configuration (left: boundary
memory positions of the three buffer areas):
config_list(4000, 4000)
(b) config_list(Mem1, Mem2)
with Mem1 > 0, Mem2  2
(c) config_list(Mem1, –1) with Mem1 > 0
(d) config_list(Mem1, 0) with Mem1 > 0
(e) config_list(-1, x) with x as desired
Examples of valid list buffer configurations
3
2
1
1
1
(c) (d) (e)
20
- Mem1
27
70