Personal Daq User’s Manual
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Hardware Setup 3-5
Example 1: Direct Connection to Computer USB Port(s)
In example 1 two Personal Daqs (and optional PDQ modules) are connected by cable to each of the
computer’s USB ports. The number of USB connectors may vary from PC to PC. When you connect
Personal Daq units directly to a USB connector in this manner, no additional power source is required
since the computer’s USB connector power pins supply the Personal Daq and associated PDQ expansion
module with adequate power (500 mA at 4 to 5.25 V).
The use of certain notebook computers may require the use of a power adapter with
your Personal Daq.
Example 2: Connection to USB-Powered Hub
In example 2, four Personal Daqs (and optional PDQ modules) are connected by cable to individual ports
of a single
USB-powered hub
. Since the hub receives all its power from the computer’s USB, the hub
cannot supply adequate power to the Personal Daq units. Because of this aspect of insufficient power, each
Personal Daq is connected to its own power adapter.
Note:
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.
When using a power adapter with your Personal Daq system, be sure to supply power
(from the adapter to the Personal Daq) before connecting the USB cable. This allows
Personal Daq to inform the host computer (upon connection of the USB cable) that the
unit requires minimal power from the computer.
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