Measurement Computing Personal Daq rev.6.0 - Manual (Page 38)

3-2 Hardware Setup 878695 Personal Daq User’s Manual
Personal Daq, System Components
Personal Daq
The following illustration points out key physical features of the Personal Daq. Aside from labeling and
the number of terminal blocks, Personal Daq/54, /55, and /56 look very much alike. Upon closer
examination you can see differences.
Both the /55 and /56 contain a DB25 expansion port for mating with a PDQ expansion module. Slots on
the main units and expansion modules provide a means of attaching units securely with locking clips.
Personal Daq/54 also has a DB25 port. However, in the case of the Daq/54 the port is used only for
calibration as discussed in chapter 6. Personal Daq/54 contains no functionality in regard to expansion
modules. Also note that Personal Daq/54 has no terminal block for Digital I/O and no Frequency/pulse
input terminals.
A customized label can be inserted in slots above the terminal connectors. The labels are especially useful
in acquisition systems that consist of several Personal Daqs and PDQ expansion modules. Appendix D
contains blank labels.
Note 1 Note 2
Note 1: Label slots are included on Personal Daq/55 and /56. The slots are not included on
Personal Daq/54.
Note 2: An expansion module (PDQ1 or PDQ2) can be added to Personal Daq/55 and /56 units.
Although an expansion module can physically connect to a Personal Daq/54, it will not
function with the unit. Personal Daq/54 does not include expansion functionality. For /54
devices, the 25-pin port is used only for calibration as discussed in chapter 6.
Note 3: “Active” [LED blinking] means that an acquisition is in progress. “Ready” [LED on solid] means
that the unit has power, has USB communications established, and is ready to acquire data.
PDQ Expansion Modules (Does not apply to Personal Daq/54)
You can connect either of two PDQ expansion modules (PDQ1 or PDQ2) to the Personal/55 and
Personal/56 units. Module specifications are listed in the preceding chapter.
With exception of the end-faces, the PDQ modules have the same physical appearance as Personal Daq/56.
The above figure includes an illustration of a PDQ2 module connected to a Personal Daq/55. Two locking
clips are used to hold the units together. The clips ensure a good connection is maintained.
Personal Daq/54 does not accept expansion modules .