Operation
33
Table
4-1: DB 25 Pin Assignments
Input/Output Pin Function Signal Mode
Input 1 Start/Stop Laser. See table 4-2. + 5 VDC Level
Output 2 Laser Ready + 5 VDC Level
Input 3 Inhibit Q-switch + 5 VDC Level
Input 4 External Single Shot Trigger + 5 VDC Pulse
Input 5 Enable External Fixed + 5 VDC Level
Input 6 Enable External Variable Rep Rate + 5 VDC Level
Input 7 External Variable Rep Rate Set 0 – 5 VDC Analog
Input 8 External Attenuator Set 0 – 5 VDC Analog
Input 9 External PFN Voltage Set 0 – 5 VDC Analog
Output 10 Lamp Sync Out + 5 VDC Pulse
Output 11 Interlock ok + 5 VDC Level
Input 12 Stop + 5 VDC Pulse
Input 13 Enable TTL Direct Port + 5 VDC Level
14 Ground
15 Ground
16 Ground
17 Ground
18 Ground
19 Ground
20 Ground
21 Ground
22 Ground
23 4x rate (system use only)
24 500 Hz (system use only)
25 +12 switched (do not use) +12Vds level
Table 4-2: TTL Direct Control Signals
Pin Function Function
1 Start/Stop Laser 0 VDC level turns laser off.
+5 V level turns laser on—must be held high for
laser to operate. The laser will not fire for eight
seconds after this signal is set high. If a signal (500
µs pulse) is placed on pin 12, the laser may not be
restarted until pin 1 is reset to 0 VDC and then back
to 5 VDC.
3 Inhibit Q-switch 0 VDC level allows Q-switch to operate normally
+ 5 VDC level inhibits Q-switch—lamp will fire
normally, but no laser pulse is emitted. Used for
warm up.
4 External Single
Shot Trigger
+ 5 VDC, 500 µs pulse fires a single laser shot.
5 Enable External
Fixed
+ 5 VDC level fires the laser at a fixed, maximum
repetition rate of the laser.
6 Enable External
Variable Rep
Rate
+ 5 VDC level fires the laser at a variable repetition
rate, determined by the external variable repetition
rate set by pin 7.
7 External Variable
Rep Rate Set
0 – 5 VDC analog level, with 5 VDC corresponding
to the maximum laser repetition rate.
8 External
Attenuator Set
0 – 5 VDC analog level, with 0 VDC corresponding
to minimum energy and 5 VDC corresponding to
maximum energy.
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