Digital Signal Connections - Advantech PCM-3718 Series User Manual

3.4 Digital Signal Connections

The PCM-3718 cards have two 8-bit digital input/output channels. The
digital I/O levels are TTL compatible. The following figure shows con-
nections of 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. See the figure below:
PCM-3718 Series User Manual
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DIO
D.GND D.GND
28
TTL Devices
or