User’s guide Ytterbium Pulsed Fiber Laser RFL-P70Q~P100Q Ver.: 2.0
5 / 9
3. Control Interface
There are DB9 and DB25 interfaces at the rear of the laser. The DB9 is a RS232 interface
only used for debugging, no needs to connect. And DB25 is the joint interface connecting control
system with laser system, please make sure the connection is reliable before operation. Feet of
the DB25 are defined as follows in Fig. 5.
Figure 5. Connect port of controller
Table 3 Definition of connect ports of controller
1-8 (D0-D7)
Power Setting
8 bit Parallel port;
D0 is minimum bit and D7 is maximum bit; Range: 0-255
(hexadecimal: 0X00-0XFF)
See alarm codes in table 5
17 VCC
+5VDC power supply input for independent operation of
the guide laser and PCB
18 EE
Emission Enable (EE) signal.
HIGH (>3V): Emission Enable
LOW or disconnected (<1V): Emission Disable
19 EM
Emission Modulation (EM) input.
HIGH (>3V): Emission ON
LOW or disconnected (<1V): Emission OFF
20 Sync
Pulse Repetition Rate (Synchronization) input, square
wave. (70-100kHZ)/(20-200kHZ)
Guide Laser (red diode) ON/OFF input.
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