Scanlab RTC6 PCIe Board - Sky Writing Mode 2

RTC6 boards
Doc. Rev. 1.0.21 en-US
7 Basic Functions for Scan Head Control and Laser Control
161
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Sky Writing Mode 2
In Sky Writing Mode 2, the RTC6 PCIe Board
calculates time-shortened Sky Writing motions.
Here, too, each to-be-executed vector/arc gets
preceded and appended with a run-in motion and a
run-out motion in extension of the vector/arc at
mark speed. Within a Sky Writing Mode 2 marking
sequence, however, neither forerun motions (in the
run-in phase) nor retrace motions (in the run-out
phase) of the galvanometer scanners occur. Instead,
the RTC6 PCIe Board executes Sky Writing jumps (at
the currently specified jump speed) from jump vector
startpoints to run-in startpoints, from run-out
endpoints to run-in startpoints, and from run-out
endpoints to jump vector endpoints, see Figure 44.
set_sky_writing and set_sky_writing_para always
switch on Sky Writing Mode 1. Therefore, it is only
possible to change the mode afterwards to
Sky Writing Mode 2 by set_sky_writing_mode or
set_sky_writing_mode_list.
Sky Writing Mode 2 activation affects the same
commands as Sky Writing Mode 1 (except ellipse
commands, see below). Time-shortened Sky Writing,
however, can only occur within a sequence of non-
parameterized [*]mark[*] Commands,
arc commands and Jump Commands (may also
contain timed or 3D commands). If such a sequence
gets interrupted by some other “non-
Sky Writing Mode 2-capable” list command (for
example, a [*]para[*] Command, ellipse command or
any short list command), then the RTC6 PCIe Board
suspends Sky Writing Mode 2 and complete the
preceding command in Sky Writing Mode 1 (with a
retrace motion of the galvanometer scanners). This
suspension of Sky Writing Mode 2 does not
deactivate it: subsequent “Sky Writing Mode 2-
capable” commands are started at in
Sky Writing Mode 1 (with a forerun motion of the
scan head) and then executed again in
Sky Writing Mode 2.
Even with Sky Writing Mode 2 switched on, ellipse
commands are always executed in
Sky Writing Mode 1.
45
Sky Writing motions (grey) in Sky Writing Mode 2 and
Sky Writing Mode 3.
cos(ϕ) ≥ Limit
cos(ϕ) ≥ Limit
cos(ϕ) < Limit
cos(ϕ) < Limit
Mark
Mark
Mark
Mark
Mark
Mark
Mark
Mark
Arc
Arc
Arc
Arc
Arc
Arc
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m m
m
m
m
j
j
j
j
j
j
j
j
j
j
j
j
j
j
No Sky Writing
for small
changes of
direction
JumpJump
Jump
Jump
Jump
Jump
Jump
Jump
Sky Writing Mode 3Sky Writing Mode 2
Legend
m With mark speed.
j With jump speed.