User’s guide Ytterbium Pulsed Fiber Laser RFL-P20MB Ver.: 2.0
1)
The pump current of diode laser and the laser output power are controlled by setting the value
of PIN1-PIN8 (TTL level). PIN1-PIN8 can be set from 0
～
255
，
corresponding to the laser
output power from 0
～
100
％
(the actual laser power may not be strictly linear with the
setting value). The relationship between PIN value and output power is shown in Table 4:
Table 4 Definition of power control pins.
Setting 1
Setting 2
Setting 3
Setting 4
Setting 5
PIN 1
0
0
0
0
1
PIN 2
0
0
0
0
1
PIN 3
0
0
0
0
1
PIN 4
0
0
0
0
1
PIN 5
0
0
0
1
1
PIN 6
0
0
1
1
1
PIN 7
0
1
1
1
1
PIN 8
1
1
1
1
1
Current
~50 %
~75 %
~87.5 %
~93.75 %
100%
2)
PIN 10 and PIN 14 are all digital GND.
3)
PIN 17 receives external 5V DC voltage to provide power supply for alarm signal.
4)
PIN 18 is the start signal of the MO. PIN19 is the input for the optical output signal. The
electrical level for both PIN18 and PIN19 are 5V. Before turning on PIN 19, MO signal must
be switched ON, in other word, the signal of PIN 18 must be ahead of PIN 19 at least 5 ms,
and otherwise the laser machine may be damaged.
5)
PIN 20 provides control of the frequency. The frequency range should be 10 kHz~1000
kHz, depends on the varying power levels of different laser machines.
ATTENTION: The frequency signal must be ahead of the EM signal at least 5 ms,
otherwise the laser machine may be damaged.
Below figure shows DB25 sequence diagram:
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