To enable the interlock through the front panel:
1. Press the CONFIG key.
2. Select the OUTPUT menu item.
3. Select INTERLOCK.
4. Select DISABLE to disable the interlock or ENABLE to enable it.
To enable the interlock using a remote command, send:
smua.interlock.enable = smua.ENABLE
To disable the interlock using a remote command, send:
smua.interlock.enable = smua.DISABLE
Interlock connections through digital I/O port
The following figure shows digital I/O port pin 20 as ground. You can also use pin 15, 16, 17, 18, 19,
or 21 as ground.
The +5 V source is shown as digital I/O port pin 22. You can also use pin 23 or 25 as the +5 V source.
Use a two-conductor low-voltage cable to connect the +5 V source to the low-voltage remote switch.
The recommended cable is 22 AWG (20 AWG maximum) with 1.2 mm to 1.6 mm outer diameter.
Figure 25: Digital I/O port interlock connections
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