Considerations When Connecting The Digital I/O; Wiring An Isolated Input To A Sourcing Output Device - National Instruments NI PCIe-8255R User Manual

Ieee 1394a and ieee 1394b interface device with reconfigurable i/o

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Considerations When Connecting the Digital I/O

Do not apply a voltage greater than 30 VDC to the isolated inputs. Doing so could

Caution

damage the NI 8255R.

The isolated trigger inputs on the NI 8255R are current sinking and

optically isolated. The following are considerations you need to make when

connecting the digital I/O.

You can wire an isolated input to a sourcing output device, as shown in the

following figure. Refer to Getting Started with the NI PCIe-8255R for

information about switching thresholds and current requirements.

Figure 2-5 shows an example of connecting an isolated input to a sourcing

output device.

Sourcing

Output

Device

Figure 2-5. Connecting isolated input to a sourcing output device

Viso

Input

Current

Limiter

Ciso

NI 8255R

2-13

Chapter 2

Hardware Overview

Vcc

NI PCIe-8255R User Manual

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