Chapter 3
Signal Connections
©
National Instruments Corporation
3-3
NI PCIe-1427 User Manual
15-pin D-SUB Connector
The 15-pin D-SUB connector connects to general purpose digital I/O. The
general purpose digital I/O available on this connector includes four TTL
I/O lines, two optically isolated input lines, and two RS-422 input lines.
The RS-422 lines can be used individually as either single-ended or
differential lines, or together as a quadrature encoder input.
National Instruments provides a generic 15-pin cable assembly kit
(part number 190912-04) that breaks the connector out into 15 color-coded
wires for easy connectivity. Refer to the
15-Pin D-SUB Cable
Specifications
section of Appendix A,
Cabling
, for information about
ordering a cable assembly kit.
If you require twisted pair wiring, you must build a custom cable. Refer to
the connector pin assignments in Figure 3-3, the signal descriptions in
Table 3-2, and the
15-Pin D-SUB Cable Specifications
section of
Appendix A,
Cabling
, to build a custom cable for the 15-pin D-SUB
connector.
Figure 3-3.
15-pin D-SUB Connector Pin Assignments
9
10
11
12
1
3
14
15
1
2
3
4
5
6
7
8
DGND
DGND
DGND
I
S
O_IN(1)+
I
S
O_IN(1)–
PHA
S
E_B+
PHA
S
E_B–
TTL_TRIG(0)
TTL_TRIG(1)
TTL_TRIG(2)
TTL_TRIG(
3
)
I
S
O_IN(0)+
I
S
O_IN(0)–
PHA
S
E_A+
PHA
S
E_A–
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