Manual NI Vision NI 17xx (page 23 of 90) (English)

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Chapter 2 Power and I/O

Connecting to a Quadrature Encoder

This section applies only to the following NI Smart Cameras:

Connect RS-422 compatible differential quadrature encoders to the

NI 17xx Smart Camera to provide positional information. A quadrature

encoder uses two output channels, Phase A and Phase B, to track the

position of a rotary shaft. Generally, the shaft is coupled to a motor drive

that controls the movement of an object. By providing Phase A and Phase B

signals to the smart camera, you can obtain a precise measurement of the

object position. Using a quadrature encoder gives you the ability to specify

your trigger delay in terms of positional units—such as inches or

centimeters, after applying the resolution information of your

encoder—rather than time.

National Instruments does not recommend the use of single-ended

encoders with the smart camera. This configuration would require the

ground for a single-ended encoder to be connected to the COM pin of the

smart camera, and the PhaseA– and PhaseB– signals would be left

unconnected. In this configuration, the system is susceptible to significant

noise that would be eliminated by using a differential encoder.

Shielded encoder cables are recommended for all applications. Unshielded

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

Refer to the External Trigger section of Chapter 5, Image Acquisition,

for information about using a quadrature encoder to delay a trigger.

• NI 1742 • NI 1762

• NI 1744 • NI 1764

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NI Vision NI 17xx Manual

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