
PCI-1711U Series User Manual 26
3.3.3 Digital Signal Connections
The PCI-1711U/UL has 16 digital input and 16 digital output channels.
The digital I/O levels are TTL compatible. The following figure shows
connections to exchange digital signals with other TTL devices:
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.
D.GND
DO
DI
D.GND
TTL Devices
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