National Instruments NI 9411 Operating Instructions And Specifications page 14

Single-Ended
Encoder
Figure 5. Connecting a Single-Ended Encoder to the NI 9411
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External
Power Supply
+ –
V
sup
+5 V
+5 V
out
+5 V
Reg
DI0a
Receiver
A
DI0b
Circuitry
DI1a
Receiver
B
DI1b
Circuitry
DI2a
Index Receiver
DI2b
Circuitry
COM
GND
13 NI 9411 Operating Instructions and Specifications
COM
NI 9411