RTC
®
5 PC Interface Board
Rev. 1.9 e
7 Basic Functions for Scan Head and Laser Control
109
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Similarly, overlaps would occur for very large
LaserOff delays set for the beginning of a non-
mark command and extending across the next
mark command up to yet another non-mark
command. Here, the laser wouldn’t switch off
between the two mark commands and instead
only switch off after the second non-mark
command and only after expiration of the
LaserOn delay (see
). To prevent this situ-
ation, a check is performed at the start of a mark
command to determine if the laser would have
already switched off prior to the end of the
command. If not, then the mark command will
get postponed by an appropriate scanner delay.
On the other hand, laser switch-off during polyg-
onal traversal with sharp corners (edgelevel
parameter) will only occur if the laser was already
on during this polygonal traversal (i.e. when all
previously initiated LaserOn delays have already
expired and no LaserOff delays remains active).
Notes
• The above description applies to firmware files
(
RTC5RBF.rbf
) where version > 509 (see
). Discontinue using earlier
firmware versions, because in the above example
the laser would get switched off for the first mark
command, but not for the second one. Likewise,
the laser would get switched off for the first - but
not the second - non-mark command and
sometimes not for
.
• Thanks to these previously described automatic
adjustments, the RTC
®
5 always fulfills the
scanner delay conditions (markD>LOffD – LOnD,
edgelevel>LOffD – LOnD,
pLOnD>LOffD) at run-time that had to
be explicitly observed with the RTC
®
4.
• Automatic adjustment of the scanner delays
might result in a total marking time longer than
that expected from just adding-up the predefined
vector lengths and delays.
39
Mark
Command1
LOn
Delay2
LOff Delay1
Mark
Command2
Mark
Delay1
Other Command
(jump_rel, list_nop, ...)
LOn
Delay1
without correction
laser does not
switch on
for marking 1
Laser
with automatic correction
Mark
Command1
LOn
Delay2
LOff Delay1
Mark
Command2
Mark
Delay1
Other Command
(jump_rel, list_nop, ...)
LOn
Delay1
Laser
Laser
scanner delay is
automatically inserted
Automatic adjustment of the scanner delays for large LaserOn
delays
40
Mark
Command1
LOn
Delay2
LOff Delay1
Mark
Command2
Mark
Delay1
Other Command
(jump_rel, list_nop, ...)
LOn
Delay1
Laser
LOff Delay2
Mark
Delay2
Other Command
scanner delay is
automatically inserted
Laser
Mark
Command1
LOn
Delay2
LOff Delay1
Mark
Command2
Mark
Delay1
Other Command
(jump_rel, list_nop, ...)
LOn
Delay1
laser does not
switch off after
marking 1
Laser
LOff Delay2
Mark
Delay2
with automatic correction
without correction
Automatic adjustment of the scanner delays for large LaserOff
delays