Measurement Computing USB-PDISO8/40 User Manual page 11

USB-PDISO8/40 User's Guide
The optically isolated (500 V) inputs can be read back as a single byte. Each input has a software-selectable
filter with a time constant of 5 ms (200 Hz). The filter is required for AC inputs, and recommended for almost
all DC inputs. Unless you have a good reason to turn off a filter, MCC recommends that you enable it.
You can enable and disable (default) each input filter by selecting the device and then selecting
in InstaCal.
Install»Configure
Figure 5 shows a schematic of a simple connection from a +9 V battery to the relay 4 connector pins. When the
relay is energized, relay 4 NO connects the battery voltage to input 4 terminal B.
Figure 4. USB-PDISO8/40 single-channel configuration
Figure 5. Schematic of battery-to-relay connection
Figure 6. USB-PDISO8/40 single-channel configuration
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Functional Details