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LabJack
Measurement & Automation Simplified
The team at LabJack is driven to make measurement and automation simple and affordable. Located in Lakewood, Colorado, LabJack Corporation builds great hardware and software for industry, government, and education.
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#1
That makes sense if you have the relay connected to VS/DAC0. VS is about 5 volts, so if DAC0 is set to 5 volts there is not voltage difference and no current flows. If DAC0 is set to 0 you have a voltage difference of 5 volts and current does flow to turn on the relay.
With the DACs, you would typically use the sourcing configuration (DAC/GND) rather than sinking, and I have now noted that above.