National-instruments Interface Device NI PCI-1426 Manual do Utilizador descarregar pdf (Página 17)

Chapter 2 Hardware Overview

NI PCI-1426 User Manual 2-6 ni.com

Figure 2-4. Example of Connecting an Isolated Input to a Sinking Output Device

Connecting to a Quadrature Encoder

The NI 1426 accepts differential (RS-422) line driver inputs. Shielded

encoder cables are recommended for all applications. Unshielded cables

are more susceptible to noise and can corrupt the encoder signals. Refer to

Figure 2-5 for an example of connecting differential line drivers.

Figure 2-5. Example of Connecting Differential Line Drivers

Vcc

Sensor

Power

Current

Limiter

NI 1426

–

NPN (Sinking)

Output Device

Sensor

Common

26LS32

–

Phase A+

Phase A–Phase A–

Phase A

Twisted

Pair

26LS32

–

Phase B+

Phase B–Phase B–

Phase B

Twisted

Pair

Encoder NI 1426

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National-instruments Interface Device NI PCI-1426 Manual do Utilizador Página 17