National Instruments AT E Series, User Manual

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Chapter 4 Connecting Signals
AT E Series User Manual 4-30 ni.com
Caution Under no circumstances should you connect these +5 V power pins directly to
analog or digital ground or to any other voltage source on the AT E Series device or any
other device. Doing so can damage the AT E Series device and the PC. NI is
not liable for
damage resulting from such a connection.
Timing Connections
Caution Exceeding the maximum input voltage ratings, which are listed in Tables 4-3
through 4-6, can damage the AT E Series device and the PC. NI is not liable for any
damage resulting from such signal connections.
All external control over the timing of the AT E Series device is routed
through the 10 programmable function inputs labeled PFI0 through PFI9.
These signals are explained in detail in the next section,
Programmable
Function Input Connections . 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.
The data acquisition signals are explained in the DAQ Timing Connections
section later in this chapter. The waveform generation signals are explained
in the
Waveform Generation Timing Connections section later in this
chapter. The general-purpose timing signals are explained in the
General-Purpose Timing Signal Connections section later in this chapter.
All digital timing connections are referenced to DGND. This reference is
demonstrated in Figure 4-12, which shows how to connect an external
TRIG1 source and an external CONVERT* source to two of the
AT E Series device PFI pins.