Chapter 2
Hardware Overview
©
National Instruments Corporation
2-7
NI PCIe-1427 User Manual
Figure 2-5.
NI 1427 Quadrature Encoder/RS-422 Inputs Circuit
Figure 2-6 shows an example of connecting differential line drivers.
Figure 2-6.
Example of Connecting Differential Line Drivers
+
–
Phase A–
Phase A+
+
–
Phase B–
Phase B+
+3.3 V
26LV32
26LV32
10 k
Ω
10 k
Ω
10 k
Ω
10 k
Ω
7.5 k
Ω
7.5 k
Ω
7.5 k
Ω
7.5 k
Ω
Phase A+
Phase A–
Phase A
Phase A
Twisted
Pair
Phase B+
Phase B–
Phase B
Phase B
Twisted
Pair
Encoder
NI 1427
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