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Ch A
Ch B
Counter Value
5
© National Instruments Corporation
Figure 28 shows a quadrature cycle and the resulting increments and
decrements for X1 encoding. When channel A leads channel B, the
increment occurs on the rising edge of channel A. When channel B leads
channel A, the decrement occurs on the falling edge of channel A.
Ch A
Ch B
Counter Value
5
X2 Encoding
The same behavior holds for X2 encoding except the counter increments or
decrements on each edge of channel A, depending on which channel leads
the other. Each cycle results in two increments or decrements, as shown in
Figure 29.
Ch A
Ch B
Counter Value 5
X4 Encoding
The counter increments or decrements similarly on each edge of
channels A and B for X4 encoding. Whether the counter increments or
decrements depends on which channel leads the other. Each cycle results in
four increments or decrements, as shown in Figure 30.
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7
8
9
10
11
6
7
Figure 28. X1 Encoding
6
7
8
9
Figure 29. X2 Encoding
12
13
13
12
11
Figure 30. X4 Encoding
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NI cDAQ-9172 User Guide and Specifications
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