Figure 3-7. digital i/o connections, Connecting timing signals, Connecting timing signals -12 – National Instruments SCB-68 User Manual

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Chapter 3

Connecting Signals

SCB-68 Shielded Connector Block User Manual

3-12

ni.com

Figure 3-7. Digital I/O Connections

Connecting Timing Signals

If you are using a 68-pin or 100-pin DAQ device, all external control over
device timing is routed through the programmable function input (PFI)
lines <0..9>. These PFI lines are bidirectional; as outputs they are not
programmable and reflect the state of many DAQ, waveform generation,
and general-purpose timing signals. The remaining timing signals use
five different dedicated outputs.

Note

For more information, refer to the device user manual at

ni.com/manuals

for

detailed signal description and connection information.

+5 V

LED

TTL Signal

+5 V

Switch

I/O Connector

DGND

SCB-68

DIO<0..3>

DIO<4..7>