Chapter4 ConnectingSignals
©NationalInstruments Corporation 4-19 NI6013/6014 User Manual
Figure 4-9 showsDIO<0..3> con figuredfor digital input and DIO<4 ..7>
configuredfor digital output. Digital input applications includ er eceiving
TTL signals andsensing external device states, such as the switch state
shownin the Figure 4-9. Digital output app lications include sending TTL
signalsand 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
af ewseconds after the overcurrent condition is removed. These pins are
referenced to DGND and can be used topower ex ternal digital circuitry.
The power rating is +4.65 to +5.25 VDC at 1 A.
Caution Do not connect these +5 V powerpins directly to an alog or digital ground or to
anyother voltage source on the NI 6013/6014 or any other device. Doing so can damage
the NI 6013/6014 and the computer.NI is not liable fordamage resulting from such
aco nnection.
Connecting Timing Signals
Caution Exceedingthe maximum input voltage ratings, which are listed in Table 4-3, can
damage the deviceand the computer. NI is not liable for any damage resulting from such
signal connections.
All externalcontrol over the timing of the device is routed through the
10 PFIsl abeled PFI<0..9>. 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
ofm anyDAQ, waveform generation, and general-purpose timing signals.
There are fiveother dedicated outputs for the remainder of the timing
signals. As inputs, the PFI signals are programmable and can control
anyDAQ, waveform generation, and general-purpose timing signals.
TheDAQ signals are explained in the DAQ Timing Connections section.
The Waveform Generation Timing Connections section explains the
waveformgeneration signals, and the General-Purpose Timing Sig nal
Connections sectionexplains the general-purpose timing signals.