RTC
®
5 PC Interface Board
Rev. 1.9 e
8 Advanced Functions for Scan Head and Laser Control
170
8.5 Using Several Different Correction Tables
8.5.1 Configuration with Two 2D
Scan Systems
The RTC
®
5 can store four different correction tables
at the same time. For two 2D scan systems controlled
from a single RTC
®
5 board, each scan system can
thereby receive its own separate image field
correction.
The two desired correction tables can be assigned to
either of the two scan head control ports by the
command select_cor_table or select_cor_table_list
(also see page 41).
The following steps describe how to use two
correction tables in a double scan system configu-
ration:
Load each of the desired 2D correction files with
the command
load_correction_file(Name, n, 2)
(
n
= 1…4).
Refer to the command load_correction_file
(page 328) for details.
Afterwards, you have to assign a loaded 2D-
correction table to the first and the second scan
head each by calling the command
select_cor_table(n1, n2)
with (
n1
and
n2
= 1…4).
Use set_matrix, set_offset, set_scale, set_angle
or the corresponding list commands to specify
additional gain, rotation and offsets to align the
two image fields precisely with respect to each
other.
Notes
• The default setting for select_cor_table and
select_cor_table_list is
(1,0)
, i.e. correction
table #1 is used for the first scan head. The
output signals for the second scan head are
turned off.
•The RTC
®
5 returns to this setting after every reset
(by load_program_file). If a different setting is to
be used, the command select_cor_table or
select_cor_table_list must be called again after
the reset. load_program_file deletes correction
tables number 3 and 4.
• The scan head control ports cannot be simulta-
neously assigned two 3D correction tables, nor
can they be simultaneously assigned both a 2D
and a 3D correction table.
8.5.2 Using Several Correction
Tables with a Single Scan
System
It can also be useful to work with several different
correction tables in a single scan system, e.g. if a
pointer laser and a main laser with a different wave-
length are used. Specialized applications sometimes
also require different correction files quickly in
succession. Because no correction files can be loaded
during list processing, downloading between
processing would result in non-productive time
expenditure. If the RTC
®
5’s 3D option has been
enabled, then up to four 3D correction tables, or a
mix of 2D and 3D correction tables, can be loaded
into its memory.
Use load_correction_file to load the correction
files.
Afterward, use the commands
select_cor_table(n, 0)
(
n
= 1…4)
to switch from one correction table to the other.
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