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Chapter 2 Power and I/O
NI 17xx Smart Camera User Manual 2-8 ni.com
Figure 2-5 shows an example of connecting the quadrature encoder
differential line drivers.
Figure 2-5. Connecting Differential Line Drivers
Figure 2-6 shows the internal quadrature encoder/RS-422 input circuit.
Figure 2-6. NI Smart Camera Quadrature Encoder Input Circuit
Phase A+
Phase A–
Phase A–
Phase A
Phase B+
Phase B–
Phase B–
Phase B
Encoder NI 17xx
Twisted
Pair
Twisted
Pair
+
–
Phase A–
Phase A+
+
–
Phase B–
Phase B+
+3.3 V
10 kΩ 10 kΩ
10 kΩ 10 kΩ
7.5 kΩ 7.5 kΩ 7.5 kΩ 7.5 kΩ
NI 17xx