Scanlab RTC 5 PC Interface Board, Installation And Operation Manual

Page: 138 / 622

RTC
®
5 PC Interface Board
Rev. 1.9 e
7 Basic Functions for Scan Head and Laser Control
138
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• Note that half of the output period must be
specified.
• In laser mode 6 the time base for the LASER1
signal is always 1/64 µ s (in RTC
®
5 mode) or 1/8 µ s
(in RTC
®
4 compatibility mode).
• To mark points, you can use laser_on_pulses_list
to switch on the LASERON signal for a specified
number of external pulses (or a specified time
interval). The external pulses must be supplied at
the LASER connector’s DIGITAL IN1 digital input
(see
page 46 ). With para_laser_on_pulses_list , a
selected signal parameter will be linearly varied to
the supplied value during point marking.
7.4.8 Pulse Picking Laser Mode
The commands set_pulse_picking or
set_pulse_picking_list select the pulse picking laser
mode. The laser control timing diagram in figure 52
shows the corresponding signals.
For “laser active” operation (if applicable after a
LaserOn delay and if enabled via
set_laser_control or
enable_laser ):
• The LASERON signal is switched on
• A modulation signal is provided at the LASER1
output with pulse lengths and periods that can
be defined via
set_laser_pulses ,
set_laser_pulses_ctrl
or
set_laser_timing
• The LASER2 output emits the same signals as the
LASER1 output (in phase), but only every
No
th
pulse in accordance with the parameter
No
in
set_pulse_picking or set_pulse_picking_list .
For “laser standby” operation (if applicable after a
LaserOff delay):
• The LASERON signal is switched off
• Standby pulses are provided in phase at the
LASER1 and LASER2 outputs with pulse lengths
and periods that can be defined via
set_standby
or set_standby_list .
You can activate constant pulse length mode (a
special case of the pulse picking laser mode) via the
command
set_laser_control ( bit #7 = 1). In this
mode, the “laser active“ LASER2 signal is outputted
with a fixed pulse length that is independent of the
LASER1 signal (the desired LASER2 pulse length is
specified via the
set_pulse_picking_length
command). This allows you to also use the LASER2
signal as a gate signal for short LASER1 pulses.
LASER1
LASER2
(No = 2)
LASERON
"Laser active" "Laser standby" "Laser standby"
Q-Switch
Period
Q-Switch
Pulse Width
Q-Switch Delay
Time
LaserOff
Delay
LaserOn
Delay
Vector
Output
Start of
Vector
End of
Vector
Standby
Pulse Width
Standby
Period
52
Laser control timing diagram for pulse picking laser mode (with active-high laser control signals and
No
= 2)
Pulse Picking Laser Mode