LASER OPERATION
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11
Control Port – Functionality
The SMD24 can be operated directly via the Control port (see Fig 4-1) by applying 0 to 5 V, interlocks and push button in
accordance with the diagrams in this section.
9-way Function Table and Pin-Out Diagram
Pin
Function
1
+5 V rail (source)
2
Interlock (connection 2) and Enable LED anode
3
Enable switch (connection 1)
4
Diode current enable (connect to pin 1)
5
Ground (GND)
6
Interlock (connection 1)
7
Enable LED cathode
8
Enable switch (connection 2)
9
Ground (GND)
The remote Interlock, Enable and Enable LED can be wired in accordance with the diagrams below [Fig 5-1 & Fig 5-2], to be
used as part of a laboratory interlock safety circuit. If either Interlock is broken the system will shut down, the Enable
button must be pressed to restart the system.
Connections to the control port shall be “potential free” i.e. isolated from mains voltage by a barrier rated at 3 KV (e.g.
Double Insulation, Etc).
The combined electrical resistance of the “Enable Switch”, “Interlock” and associated wiring shall be less than 5 ohms.
If a solid-state device such as on opto-isolator is used as the switching element(s), the total combined voltage drop must
not exceed 500 mV.
The current through the “Interlock” and “Enable Switch” circuitry is less than 100 mA. The LED current source is 10 V via a
540 R resistor.
Figure 5-1 Figure 5-2 Figure 5-3
The PSU has its own 5 V source (pin 1) which must be shorted to pin 4 to allow full Power Mode operation. Pin one must be
linked to Pin 4.
