NI DAQPad-MIO-16XE-50, Руководство пользователя

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Chapter 3 Connecting the Signals
© National Instruments Corporation 3-23 DAQPad-MIO-16XE-50 User Manual
Power Connections
The power 5 V su5 V from the DAQPad-MIO-16XE-50
power supply. This pin is referenced to DGND and you can use the +5 V to
power external digital circuitry.
• Power rating 250 mA at +5 V maximum
The +5 V signal is fused for up to 250 mA. Blowing this fuse by shorting
+5 V to ground does not damage the DAQPad-MIO-16XE-50. If you do not
r5 V from this screw terminal, make sure that the rear panel rocker
switch is turned on, that the DAQPad-TB-52 is firmly connected to the
DAQPad-MIO-16XE-50, and that there are no shorts between the +5 V
power pin and ground. You can replace a blown fuse with the spare fuse
located on the DAQPad-TB-52 or you can use a 250 mA, fast-acting Pico II
fuse from Littelfuse.
Caution Under no circumstances should you connect this +5 V power signal directly to
any other voltage source on the DAQPad-MIO-16XE-50 or any other device. Doing so can
damage the DAQPad-MIO-16XE-50 and the PC. NI is
not liable for damage resulting from
such a connection.
Timing Connections
All external control over the timing of the DAQPad-MIO-16XE-50 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 DAQ, 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 DAQ, waveform generation,
and general-purpose timing signals.
The DAQ 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 connection
is demonstrated in Figure 3-11, which shows how to connect an external
TRIG1 source and an external CONVERT* source to two of the
DAQPad-MIO-16XE-50 PFI signals.