User manual

Chapter 4 Connecting Signals
NI 6034E/6035E/6036E User Manual 4-20 ni.com
Figure 4-9 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 switch state
shown in the Figure 4-9. Digital output applications include sending TTL
signals and driving external devices such as the LED shown in Figure 4-9.
Power Connections
Two pins on the I/O connector supply +5 V from the computer power
supply using a self-resetting fuse. The fuse resets 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.
The power rating is +4.65 to +5.25 VDC at 1 A.
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 NI 6034E/6035E/6036E
device or any other device. Doing so can damage the NI 6034E/6035E/6036E device
and the computer. National Instruments is not liable for damage resulting from such
a connection.
Connecting Timing Signals
Caution
Exceeding the maximum input voltage ratings, which are listed in Table 4-2, can
damage the device and the computer. National Instruments is not liable for any damage
resulting from such signal connections.
All external control over the timing of your device is routed through the
10 programmable function inputs labeled PFI<0..9>. 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 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 Timing Connections section
later in this chapter explains the waveform generation signals, and the
General-Purpose Timing Signal Connections section later in this chapter
explains the general-purpose timing signals.
UM.book Page 20 Monday, May 14, 2001 10:32 AM