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National Instruments Corporation
9
NI PXIe-1435 User Guide
D-Sub Connector
The 15-pin female high-density D-Sub connector connects to general purpose digital I/O, which
includes four TTL I/O lines, two optically isolated inputs, and two RS-422 quadrature encoder inputs.
Table 3 shows the connector assignments and descriptions.
You can use the NI 1435 with the following I/O accessories:
•
NI 17xx 5m Pigtail breakout cable (part number 197818-05)
•
NI 17xx Unshielded Screw Terminal Breakout with 2M Cable (part number 780261-01)
Table 3.
NI 1435 15-pin D-Sub Connector Pin Assignments
Connector
Pin
Signal Name
Description
1
TTL I/O 0
TTL external trigger/Digital I/O line.
2
Iso Input 0+
30 V isolated input only line.
3
Phase A+
Quadrature encoder Phase A positive
connection for single-ended or differential
signals.
4
Phase B–
Quadrature encoder Phase B negative
connection for differential signals.
5
NC
No connection.
6
TTL I/O 1
TTL external trigger/Digital I/O line.
7
TTL I/O 2
TTL external trigger/Digital I/O line.
8
Iso Input 1+
30 V isolated input only line.
9
Phase B+
Quadrature encoder Phase B positive
connection for single-ended or differential
signals.
10
TTL I/O 3
TTL external trigger/Digital I/O line.
11
Digital Ground
Direct connection to digital ground on the
NI 1435.
12
Iso Input 0–
Iso Input 1–
Isolated reference.
13
Phase A–
Quadrature encoder Phase A negative
connection for differential signals.
14
Digital Ground
Direct connection to digital ground on the
NI 1435.
15
NC
No connection.
1
6
11
5
10
15
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