Power Connections; Timing Connections - National Instruments E Series User Manual

Chapter 4 Signal Connections

Power Connections

Warning: Do not, under any circumstances, connect these +5 V power pins directly
to analog or digital ground or to any other voltage source on the DAQCard
or any other device. Doing so can damage the DAQCard and the computer.
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connection.

Timing Connections

Warning: Exceeding the maximum input voltage ratings, which are listed in
Tables 4-2 through 4-3, can damage the DAQCard and the computer.
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signal connections.
DAQCard E Series User Manual
Figure 4-8 shows DIO<0..3> configured for digital input and
DIO<4..7> configured for digital output. Digital input applications
include receiving TTL signals and sensing external device states such
as the state of the switch shown in the figure. Digital output
applications include sending TTL signals and driving external devices
such as the LED shown in the figure.
Two pins on the I/0 connector supply +5 V from the computer power
supply via a self-resetting fuse. The fuse will reset automatically
within a few seconds after the overcurrent condition is removed. These
pins are referenced to DGND and can be used to power external digital
circuitry.
• Power rating
NOT
NOT
All external control over the timing of your DAQCard is routed
through the 10 programmable function inputs labeled PFI0 through
PFI9. These signals are explained in detail in the Programmable
Function Input Connections section. These PFIs are bidirectional; as
outputs they are not programmable and reflect the state of many data
acquisition, waveform generation, and general-purpose timing signals.
There are five other dedicated outputs for the remainder of the timing
signals. As inputs, the PFI signals are programmable and can control
any data acquisition, waveform generation, and general-purpose
timing signals.
This document was created with FrameMaker 4.0.4
+4.65 to +5.25 VDC
at 250 mA
liable for damages resulting from such a
liable for any damages resulting from such
4-22 National Instruments Corporation