National Instruments NI PCI-6110 - Manual (Page 46)

Chapter 4 Connecting Signals
NI PCI-6110/6111 User Manual 4-16 ni.com
Figure 4-7 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 Figure 4-7. Digital output applications include sending TTL
signals and driving external devices, such as the LED shown in Figure 4-7.
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.
Power rating+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 PCI-6110/6111 or any
other device. Doing so can damage the device and the computer. NI is not liable for damage
resulting from such a connection.
Timing Connections
Caution Exceeding the maximum input voltage ratings, which are listed in Table 4-3, can
damage the NI PCI-6110/6111 and the computer. NI is not liable for any damage resulting
from such signal connections.
All external control over the timing of the NI PCI-6110/6111 is routed
through the 10 PFIs, labeled PFI0 through PFI9. These signals are
explained 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.
The waveform generation signals are explained in the Waveform
Generation Timing Connections section. The general-purpose timing
signals are explained in the General-Purpose Timing Signal Connections
section.