Scanlab RTC6 PCIe Board - Page 156

RTC6 boards
Doc. Rev. 1.0.21 en-US
7 Basic Functions for Scan Head Control and Laser Control
156
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Laser-On and Laser-On Overlap
If the LaserOn Delay is switched from a long delay to
a short delay between two markings, the short
LaserOn Delay could switch on the laser before the
long LaserOn Delay of the previous marking has
expired, if the laser has been switched off between
the markers (otherwise the laser would stay on and
the new LaserOn Delay would not be effective at this
point).
To avoid this overlap, the RTC6 PCIe Board in this case
(like the RTC5) inserts a scanner delay “artificially”.
This increases the processing time and changes the
dynamics of the galvanometer scanner movement.
Laser-Off and Laser-Off Overlap
If the LaserOff Delay is switched from a long delay to
a short delay, the short LaserOff Delay could switch
off the laser before the long LaserOff Delay of the
previous marking has expired, if a marking had
switched on the laser in the meantime (otherwise the
laser would stay off and the new LaserOff Delay
would not be effective at this point)
To avoid this overlap, the RTC6 PCIe Board in this case
(like the RTC5) extends the short LaserOff Delay so
long that it only expires after the previous one (and
of course only after the intermediate LaserOn Delay).
Several Simultaneously Expiring Laser Delays
This can happen if a laser delay is only effective
beyond the length of the next command. The
RTC6 PCIe Board can process up to 256
LaserOn Delays and LaserOff Delays simultaneously
in a pipeline, as long as Laser-On and Laser-Off
alternate and Laser-On—Laser-On and Laser-Off—
Laser-Off run one after the other (see automatic
adjustments above). This allows markings
(interrupted lines) to be “pre-programmed” up to at
least 2.56 ms.
Notes
• In contrast to the RTC6 PCIe Board, the RTC5 can
only process one delay of the same type at a time.
The delays are adjusted automatically. If
necessary, scanner delay are inserted “artificially”.
In DSP mode < 3 (see set_dsp_mode), the
RTC6 PCIe Board simulates the behavior of the
RTC5 in order to display the same time sequences.
For further details, see RTC5 Manual, Chapter
7.2.3.