Laser Mode 6 - Scanlab RTC 5 PC Interface Board Installation And Operation Manual

7.4.7 Laser Mode 6

The command set_laser_mode(6) selects the laser
mode 6. This laser mode is provided for lasers, which
do not allow changing the laser power during
execution of a laser pulse. The laser control timing
diagram figure 51 shows the corresponding signals.
In this mode, a continuously-running modulation
signal with variable pulse length and frequency is
provided at the LASER1 output both for "laser active"
and for "laser standby" operation, if it is activated via
set_standby or set_standby_list.
Additionally, for "laser active" operation the
LASERON signal is switched on (if applicable after a
LaserOn delay and if enabled via
enable_laser) synchronized with the LASER1 signal
(see below).
For "laser standby" operation, the LASERON signal is
switched off (if applicable after a LaserOff delay)
synchronized with the LASER1 signal (see below).
Laser mode 6
Start of
Vector 1
Vector
Output
LaserOn
Delay
"Laser standby"
LASERON
LASER1
DIGITAL OUT1
DIGITAL OUT2
set_laser_pin_out
Laser control timing diagram for laser mode 6 (with active-high laser control signals)
®
RTC 5 PC Interface Board
Rev. 1.9 e
7 Basic Functions for Scan Head and Laser Control
set_laser_control or
End of
Vector 1
LaserOff
Delay
"Laser active" "Laser standby"
Standby
Pulse Width
set_laser_pin_out
command command
Notes
• Here a LASER2 signal is neither provided for
"laser active" nor for "laser standby" operation.
• Any change of the LASERON signal is prohibited
while the LASER1 signal is "on": the change is
executed (with delay) only when the LASER1
signal is "off" again (see
– if the LASER1 signal is set active-high – that
means: a change of the LASERON signal is not
executed while the LASER1 signal is high but is
executed (with delay) when the LASER1 signal is
low again.
Likewise, in laser mode 6 any change of the
output value at the 2-bit digital output
(DIGITAL OUT1 and DIGITAL OUT2) via
set_laser_pin_out or set_laser_pin_out_list
executed with delay, if the LASER1 signal is "on"
at the moment of change. This allows controlling
external equipment synchronously with the laser
pulses.
• The pulse length and the output period of the
LASER1 modulation signal are set with the
command set_standby
LASER1 signal is activated by setting the pulse
length to a nonzero value and is deactivated by
setting the pulse length to zero (default setting).
End of
Vector 2
Start of
Vector 2
LaserOn LaserOff
Delay Delay
"Laser active"
Standby
Period
set_laser_pin_out
command
figure 51). For instance
is
or set_standby_list. The
"Laser standby"
Time
51
137