National Instruments CVS-1459 User Manual page 14

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–
Figure 13. Connecting Differential Line Drivers
Encoder
Phase A
Phase A
Phase B
Phase B
+3.3 V
10 kΩ 10 kΩ 10 kΩ
7.5 kΩ 7.5 kΩ 7.5 kΩ
Twisted Pair
Twisted Pair
NI CVS-1459 User Manual | © National Instruments | 13
10 kΩ
+
–
EN
+
–
EN
7.5 kΩ
CVS
Diff In 0+
+
–
Diff In 0–
Diff In 1+
+
–
Diff In 1–