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Chapter 4 Signal Connections
DIO 6533 User Manual 4-10 © National Instruments Corporation
Unstrobed I/O
For low-speed, unstrobed operation, you can configure each individual
pin for input, standard output, or wired-OR output. Figure4-3 shows
DIOA<0..3> configured for input, DIOA<4..7> configured for standard
output, and DIOB<0..3> configured for wired-OR output. Unstrobed
input applications include sensing external device states, such as the
state of the switch shown in the figure, and receiving low-speed TTL
signals. Unstrobed output applications include driving external controls
and indicators such as the LED shown in Figure4-3, and sending
low-speed TTL signals.