Scanlab RTC 5 PC Interface Board, Installation And Operation Manual, Page: 127 / 622

RTC
®
5 PC Interface Board
Rev. 1.9 e
7 Basic Functions for Scan Head and Laser Control
127
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peripheral ports not being accessible during the
current 10
µ s clock period, possibly including output
to the scan head (where galvanometer scanner
motion could pause for 10
µ s).
7.3.6 Status Monitoring and Diag-
nostics
For status monitoring and diagnostic purposes, the
commands
get_value or get_values can be used to
read a variety of signals:
• a 20-bit status word returned by the scan system
– via the XY2-100 converter when applicable
(
"Status Information Returned from the Scan
System", page 127 )
• the current value of the LASERON signal
• the current cartesian output values (hence the
sample values common to both scan head
connectors: any wobbel or Processing-on-the-fly
corrections are taken into account, but not image
field corrections or coordinate transformations)
• the (specific to each scan head connector) control
values which take into account
– any coordinate transformations defined via
set_matrix , set_offset , set_scale or set_angle
(or via the corresponding list commands),
– any Z coordinate offset defined via
set_offset_xyz or set_offset_xyz_list ,
– any focal length offset defined via set_defocus
or set_defocus_list and
– any loaded correction table.
The command set_trigger / set_trigger4 can be used
on each of these signals to record their values over
time – and with a selectable sample period. The
recorded values are stored on the RTC
®
5. The
command get_waveform can be used to transfer the
recorded values to the PC.
The current status of a measurement session started
with
set_trigger / set_trigger4 can be obtained by
calling the command measurement_status .
The returned values are always 20 bits wide. When
necessary, even in RTC
®
4 compatibility mode, these
must be converted by the user into 16-bit values (by
dividing by 16). The XY2-100 status word, too, is
returned via
get_value , get_values or
set_trigger / set_trigger4 as a 20-bit value (but as a
16-bit value via get_head_status , see below).
Status Information Returned from the Scan
System
The scan system returns the following signals (on the
return channel) to the RTC
®
5 every 10 µ s via the
SL2-100 protocol:
• a 20-bit status word:
– Most scan systems return the XY2-100 status
word
(1)
. i DRIVE
®
scan systems (intelli SCAN
®
,
intelli SCAN
de
®
, intelli DRILL
®
, intelli cube
®
,
intelli WELD
®
, vario SCAN
de
) also allow other
data signals for each axis to be transmitted sep-
arately to the RTC
®
5 for evaluation instead (see
chapter 8.1, page 152 ).
– Scan systems without SL2-100 interface return
a 16-bit status word. This value is multiplied by
16 and transferred to the RTC
®
5 as 20-bit value
by the XY2-100 converter.
– The 20-bit status word can be queried via
get_value , get_values or
set_trigger / set_trigger4 (see below).
• 6 additional status bits:
– Scan systems with SL2-100 interfaces – addi-
tionally to the 20-bit status word – transmit the
6 variable bits of the XY2-100 status word.
– For scan systems without SL2-100 interfaces
the XY2-100 converter – additionally to the 20-
bit status word – transmits to the RTC
®
5
bits#6-11 of the 16-bit status word outputted
by the scan system. If the scan system outputs
the XY2-100 status word (the i
DRIVE
®
scan sys-
tems should be correspondingly configured),
then the 6 variable bits of the XY2-100 status
word will be transmitted for such systems, too.
– The 6 additional status bits are queried via
get_head_status and returned as a
(16-bit) XY2-100 status word (see command
description).
• a user data bit
– Via this user bit, i DRIVE
®
scan systems with
SL2-100 interfaces (operated without an
XY2-100 converter) can supplementally return
slowly changing status information (e.g. cur-
rent galvanometer temperature) along with the
above-mentioned “normal” status return. This
status information can be queried via
read_user_data (also see page 153 ).
(1) The status signals of the XY2-100 status word can also be used
for laser-signal auto-suppression (see page 130 ).