Figure 12. Quadrature Encoder/RS-422 Input/Output Circuit
+
–
Diff I/O 0–
Diff I/O 0+
Diff I/O 1–
Diff I/O 1+
+3.3 V
+
–
10 k
Ω
10 k
Ω
10 k
Ω
10 k
Ω
EN
EN
7.5 k
Ω
7.5 k
Ω
7.5 k
Ω
7.5 k
Ω
Figure 13. Connecting Differential Line Drivers
Diff In 0+
Diff In 0–
Phase A
Phase A
Diff In 1+
Diff In 1–
Phase B
Phase B
External Device
Industrial Controller
Twisted Pair
Twisted Pair
+
–
+
–
IC-3121 User Manual
|
© National Instruments
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13
