Chapter 3
Digital I/O Functionality
©
National Instruments Corporation
3-13
NI EVS-1464 Series User Manual
Considerations When Connecting the Digital I/O
The isolated trigger inputs on NI EVS-1464 series systems are current
sinking and optically isolated. The following are considerations you need
to make when connecting the digital I/O.
Wiring an Isolated Input to a Sourcing Output Device
You can wire an isolated input to a sourcing output device, as shown in the
following figure. Refer to
Getting Started with the NI EVS-1464
or
Getting
Started with the NI EVS-1464RT
for information about switching
thresholds and current requirements.
Caution
Do
not
apply a voltage greater than 30 VDC to the isolated inputs. Doing so could
damage the NI EVS-1464 series system.
Figure 3-5 shows an example of connecting an isolated input to a sourcing
output device.
Figure 3-5.
Connecting isolated input to a sourcing output device
Vcc
Viso
Ciso
NI EVS-1464 Series System
Input
Sourcing
Output
Device
Current
Limiter
