Measurement Computing Personal Daq rev.6.0 - Manual (Page 40)

3-4 Hardware Setup 878695 Personal Daq User’s Manual
Connecting Your Personal Daq Acquisition System
Review the CAUTIONS and notes (presented on page 3-1) prior to connecting or
disconnecting components.
Connecting a PDQ Expansion Module to a Personal Daq/55 or /56
To connect a PDQ expansion module to a Personal Daq/55 or /56 unit:
1. Review the CAUTIONS and notes presented on page 3-1.
2. Ensure the Personal Daq main unit is not connected to a USB port.
3. Ensure the Personal Daq main unit is not connected to a power adapter.
4. Plug the expansion module into the DB25 connector on the Personal Daq main unit.
5. Lock the two modules together using two locking clips (see figure, page 3-2).
6. Connect the Personal Daq main unit to power according to your system setup (3 examples
follow).
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.
Connecting Various Hardware Setups
Personal Daq data acquisition systems range from simple to complex. One example of a simple system is
that of one Personal Daq/54 connected to a PC’s USB connector. A much more complex system is one
that contains 100 Personal Daq/56 units, 100 PDQ expansion modules, and a combination of USB-powered
and self-powered hubs. Despite the wide range of possibilities in between, use of the following examples
should enable you to properly connect your system.
Note: In the examples that follow, the USB hubs have four external ports (downstream ports). The
USB hubs used in your system may have more. Connections can be adjusted accordingly.
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.