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Advantech PCI-1730 User Manual Page 32

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PCI-1730/1733/1734 User Manual 24
TTL-level Digital Input/Output
The PCI-1730 has 16 TTL-level digital inputs and 16 TTL-level digital
outputs. The following figure shows connections to exchange digital
signals with other TTL devices:
Figure 3.4 TTL-level DI/O Connection
If you want to receive an OPEN/SHORT signal from a switch or relay, add a pull-up
resistor to ensure that the input is held at a high level when the contacts are open.
See the figure below:
Figure 3.5 Open/Short Connection
DO
DI
GND
PCI-1730 TTL device
DI
GND
Switch
+5V
4.7K
PCI-1730
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