Scanlab RTC6 PCIe Board - Speed-Dependent Laser Control

RTC6 boards
Doc. Rev. 1.0.21 en-US
7 Basic Functions for Scan Head Control and Laser Control
201
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Speed-Dependent Laser Control
When activating the “speed-dependent laser control”
for the output port specified by
set_auto_laser_control, the Mode parameter is used
to select which input parameters are to be used for
calculating the correction.
As reference value for the 100% speed, always the set
(target) mark speed (set by set_mark_speed or
set_mark_speed_ctrl applies (its change is never
compensated by the “Automatic Laser Control“).
• Mode = 1 is intended (for consistency reasons)
especially for analog scan systems. The current
Microstep length per 10 µs is used as input. It
may deviate from the target speed due to the
10 µs clock pulse rounding or with
[*]timed[*] commands. Variations in the
acceleration and deceleration phases cannot be
compensated.
• Mode = 2 is intended as basic mode for iDRIVE
scan systems
(1)
. It can be combined with other
special corrections (see below).
• Extensions to Mode = 2 (any combination
possible):
– +0
Basic mode for intelliSCAN systems
– +4
Combines the speeds from Mode = 2 and
Mode = 5 to a total speed. The 100% reference
speed from Mode = 5 remains unconsidered.
Instead, the encoder speeds are converted into
galvanometer scanner bit speeds with the fly
scaling factors and then vectorially added to
the galvanometer scanner speed. A
corresponding Processing-on-the-fly Session
must be active.
– +16
Basic mode for excelliSCAN scan heads
– +32
Position-dependent correction of the
galvanometer scanner speed (in angular units)
in a one for the Image Field (“inverse speed
correction table“)
Notes
• Usually set_auto_laser_control( Mode = 2)
requires a special intelliSCAN firmware, which
returns an actual speed corrected by the signal
runtimes between the RTC6 PCIe Board and the
scan head. If you have any questions as to
whether your intelliSCAN is equipped with it or is
upgradeable, contact SCANLAB.
• Usually a combination of “speed-dependent laser
control” and a negative LaserOn Delay does not
make sense.
(1) See Glossary entry on page 27.