Connecting The Digital Input And Output - National Instruments NI 435 Series User Manual

Chapter 2 Operating the NI 435x Device

Connecting the Digital Input and Output

NI 435x User Manual
current and voltage specifications of the DIO lines are not appropriate for
the requirements, you can use external signal conditioning such as
electromechanical relay, solid-state relay, opto-coupler, and so on.
You can use the digital input lines to trigger analog acquisitions. To trigger
analog acquisitions with the LabVIEW or NI 435x instrument driver, set up
the analog acquisition configuration, then poll the digital input line for the
trigger condition and, upon getting the trigger, start the analog acquisition.
All NI 435x accessories are designed to be used for DIO. Refer to the
accessory installation guide for instructions on how to connect the DIO
lines. Figure 2-12 shows examples of how to connect DIO for various
applications such as controlling an LED; monitoring a TTL-compatible or
CMOS-compatible signal; monitoring a low-voltage switch; and
monitoring a low-voltage transistor.
For the NI 435x for USB, PXI, and PCI, you can use the TBX-68T (revision
C or later) and the CB-68T to connect to digital signal conditioning
accessories with optocouplers, solid-state relays, and electromechanical
relays, such as the SC-2061, SC-2062, SC-2063, SSR Series, and
ER Series.
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