Measurement Computing Personal Daq rev.6.0 User Manual
Page 42
3-6 Hardware Setup
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Personal Daq User’s Manual
Example 3: Connections to Self-Powered and USB-Powered Hubs
Example 3 illustrates a system that makes use of six Personal Daq units and two different style USB hubs.
Three Personal Daqs (and optional PDQ modules) are connected by cable to individual ports of a self-
powered USB hub. In addition, the self-powered hub is connected to a downstream USB-powered hub,
which is also connected to three Personal Daq units (and optional PDQ modules).
Notice that the Personal Daqs connected to the self-powered hub have no adapters connected to them. This
is because the hub receives external power (in addition to the PC supplied USB power), which is capable
of supporting the downstream devices connected directly to it. In comparison, the three Personal Daqs
connected to the USB-powered hub each require their own power adapter. As in example 2, the power
adapters used must be capable of supplying at least 500 mA and have a voltage rating of +6 to +16 VDC.
*Note: USB port locations vary from PC to PC.