RTC
®
4 PC Interface Board
Rev. 1.3 e
4 Principle Of Operation
37
innovators for industry
Laser Mode 4
The command
set_laser_mode(4)
selects the laser
mode 4. In this mode, the following laser signals are
available (see
• a LASERON signal
• a continuously-running modulation signal with
variable pulse width and frequency (LASER1). The
signal is provided for an active LASERON signal as
well as for an inactive LASERON signal (as standby
signal).
• a programmable FirstPulseKiller signal (LASER2)
The signals are available via the 9-pin D-SUB
laser connector – see
. The LASER1 and
LASER2 signals are additionally available at the LASER
EXTENSION connector.
The pulse width and the output period of the LASER1
modulation signal are set with the command
. In the default setting the pulse width is
set to zero. Please note that
half
of the
output period
must be specified. The maximum allowed pulse width
is the
half
stand-by period.
The FirstPulseKiller signal is started together with the
LASERON signal. The length of the FirstPulseKiller
signal is set with the command
or
In laser mode 4 the time base for the signals LASER1
and LASER2 is always 1/8
µ
s.
Time
LaserOff
Delay
LaserOn
Delay
LASERON
Vector
Output
Start of
Vector
End of
Vector
LASER1
Stand-By
Period
FirstPulseKiller
Length
LASER2
(FirstPulseKiller)
Stand-By
Pulse Width
18
laser mode 4
Laser control timing diagram (laser mode 4)