25
Chapter 5 Operation Guide
rising edge on the pin19. If the HIGH level was applied to the pin 19 before
supplying voltage to the PCB, the laser does not recognize that as the
Emission switching ON signal. The pin 19 should be dropped and set to
HIGH level again. If the pin 18 was also in the HIGH state before supplying
voltage to the PCB it should be also dropped at the same time.
（7）Pin 20 is the Synchronizing Frequency Input. Pulse train with a
repetition rate (PRR) within a specified operating range should be applied
to the pin 22 (refer to the optical specification for PRR limits). The laser
emits pulses simultaneously with the rising edge of the signal. The square
wave input signal with duty cycle from 0.1 to 0.9 is allowed. Variation of the
duty cycle does not affect to the laser characteristics.
CAUTION :
◎ In case of the PRR supplied being out of the specified range (or no PRR
signal supplied) the laser safety circuit substitutes missing pulses or limits
the PRR.
（8）Pin 22 is the guide laser (red diode/ pointer) control line. Apply HIGH
to switch the guide laser ON and LOW to switch the guide laser OFF. If
the guide laser option is not installed, pin 22 can either be connected to
ground (pin14) or left floating.
CAUTION :
◎ The laser emission is not allowed simultaneously with the guide laser
operation. MO and Booster are blocked internally during the guide laser
operation. If the Emission Modulation (pin 19) or Emission Enable (pin18)
is set to HIGH level during guide laser operation, the laser will not emit
power, and will not start to emit it even after switching OFF the guide laser.
It is necessary to drop both Emission Modulation (pin 19) and Emission.
◎ Enable (pin 18) prior to restarting the laser emission. Until the restarting
is done the state “Laser is not ready for emission” will be active on
appropriate alarm/status pins.
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