RTC
®
5 PC Interface Board
Rev. 1.9 e
7 Basic Functions for Scan Head and Laser Control
136
7.4.6 Laser Mode 4
The command
set_laser_mode(4)
selects the laser
mode 4. The laser control timing diagram figure 50
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 (if applicable
after a LaserOn delay and if enabled via
set_laser_control or enable_laser)
• The LASERON signal is switched on and
• A programmable FirstPulseKiller signal is
provided at the LASER2 output.
For “laser standby” operation, additionally the
LASERON signal and (if applicable) the LASER2 signal
are switched off (if applicable after a LaserOff delay).
Notes
• The pulse length and the output period of the
LASER1 modulation signal are set with the
command set_standby or set_standby_list. The
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).
•Note that half of the output period must be
specified.
• The FirstPulseKiller signal is started together with
the LASERON signal. The length of the First-
PulseKiller signal is set with the command
set_firstpulse_killer or set_firstpulse_killer_list
(see page 423).
• In laser mode 4 the time base for the signals
LASER1 and LASER2 is always 1/64 µs (in RTC
®
5
mode) or 1/8 µs (in RTC
®
4 compatibility mode).
Time
LaserOff
Delay
LaserOn
Delay
LASERON
"Laser active""Laser standby" "Laser standby"
Vector
Output
Start of
Vector
End of
Vector
LASER1
Standby
Period
FirstPulseKiller
Length
LASER2
(FirstPulseKiller)
Standby
Pulse Width
50
Laser mode 4
Laser control timing diagram for laser mode 4 (with active-high laser control signals)
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