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4 Measurement Tutorials
Multifunction Module
Digital Input
The DAQM907A module has two non-isolated 8-bit input/output ports which you can use for reading digital
patterns.
– You can read the live status of the bits on the port or you can configure a scan to include a digital read.
– You can generate an alarm when a specific bit pattern or bit pattern change is detected on an input channel.
The channels do not have to be part of the scan list to generate an alarm.
– The internal +5 V pull-up circuitry allows you to use the digital input to detect contacts closures like micro-
switches or limit switches. An open input floats to +5 V and is read as a "1". An input shorted to ground is
read as a "0". An example of a contact close detection channel is shown below:
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Keysight DAQ970A/DAQ973A User's Guide
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