National Instruments NI 6013 User Manual

Also see for NI 6013: Note to Users

Contents

National Instruments NI 6013 User Manual Manual pdf 45 page image

Chapter 4 Connecting Signals© National Instruments Corporation 4-19 NI 6013/6014 User ManualFigure 4-9 shows DIO<0..3> configured for digital input and DIO<4..7>configured for digital output. Digital input applications include receivingTTL signals and sensing external device states, such as the switch stateshown in the Figure 4-9. Digital output applications include sending TTLsignals and driving external devices, such as the LED shown in Figure 4-9.Power ConnectionsTwo pins on the I/O connector supply +5 V from the computer powersupply using a self-resetting fuse. The fuse resets automatically withina few seconds after the overcurrent condition is removed. These pins arereferenced 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 Do not connect these +5 V power pins directly to analog or digital ground or toany other voltage source on the NI 6013/6014 or any other device. Doing so can damagethe NI 6013/6014 and the computer. NI is not liable for damage resulting from sucha connection.Connecting Timing SignalsCaution Exceeding the maximum input voltage ratings, which are listed in Table 4-3, candamage the device and the computer. NI is not liable for any damage resulting from suchsignal connections.All external control over the timing of the device is routed through the10 PFIs labeled PFI<0..9>. These signals are explained in detail in theProgrammable Function Input Connections section. These PFIs arebidirectional; as outputs they are not programmable and reflect the stateof many DAQ, waveform generation, and general-purpose timing signals.There are five other dedicated outputs for the remainder of the timingsignals. As inputs, the PFI signals are programmable and can controlany DAQ, waveform generation, and general-purpose timing signals.The DAQ signals are explained in the DAQ Timing Connections section.The Waveform Generation Timing Connections section explains thewaveform generation signals, and the General-Purpose Timing SignalConnections section explains the general-purpose timing signals.