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Thanks for the great support you provide. You always provide the answer that I need, and you manage it in a very short time.
—Mark, Racal Acoustics
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.
LabJack writes drivers for Windows, Linux, and Mac OS X, plus example code in dozens of languages.
Have a question or problem? LabJack engages in active customer support. You can find answers in the support area and FAQ, or contact us so we can help.
#1
The U3 should not be able to damage itself. You should be able to connect any I/O to anything else without causing damage. Your example is perhaps the worst thing the U3 can do to itself, but the I/O line should be able to sink the 28 mA continuously without damage.
The most common mistakes that cause damage are when you connect things that have other power supplies, particularly higher voltage supplies or AC mains.