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PRO-CTR-MAN-16V03 (0128) Copyright © 2016 Defi ne Instruments
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6
COUNT MODES
6.1 - Quad x1
Example: Shaft Encoder
This is the most commonly used counter function. Depending on the direction of
rotation, the A signal either leads or lags the B signal.
Pulse Train Direction
Signal A
Signal B
With A and B
signals 90°
out-of-phase
Primary
Counter
Clockwise
Primary counter decrements :

On a rising edge A signal when B is low
Pulse Train Direction
Signal A
Signal B
With A and B
signals 90°
out-of-phase
Primary
Counter
Counter-clockwise
Primary counter increments :

On a falling edge A signal when B is low .
6.2 - Quad x2
Example: Shaft Encoder
In this mode, the angular/linear resolution of the x1 mode is increased by 2. Depend-
ing on the direction of rotation, the A signal leads or lags the B signal.
Pulse Train Direction
Signal A
Signal B
Primary
Counter
Clockwise
With A and B
signals 90°
out-of-phase
Primary counter decrements :

On a rising edge A signal when B is low

On a falling edge A signal when B is high