Chapter 2
Hardware Overview
NI PCIe-1427 User Manual
2-6
ni.com
Figure 2-3.
Example of Connecting an Isolated Input to a Sourcing Output Device
Figure 2-4.
Example of Connecting an Isolated Input to a Sinking Output Device
Connecting to a Quadrature Encoder
The NI 1427 accepts single-ended or differential (RS-422) line driver
inputs. Shielded encoder cables are recommended for all applications.
Unshielded cables are more susceptible to noise and can corrupt the
encoder signals. Figure 2-5 shows the quadrature encoder/RS-422 inputs
circuit.
Vcc
S
en
s
or
Power
IN
+
C
u
rrent
Limiter
NI 1427
IN
–
PNP (
S
o
u
rcing)
O
u
tp
u
t Device
S
en
s
or
Common
Vcc
S
en
s
or
Power
IN
+
C
u
rrent
Limiter
NI 1427
IN
–
NPN (
S
inking)
O
u
tp
u
t Device
S
en
s
or
Common
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