Table 5.
USB3 Vision Connector Signals (Continued)
Pin
Signal Name
Signal Description
8
StdA_SSTX-
SuperSpeed transmitter differential pair
9
St
Digital I/O Port
The 44-pin Digital I/O port on the NI CVS-1459 offers 8 isolated inputs, 8 isolated outputs, 2
bidirectional differential I/O (RS-422) or single ended input lines which can be used with a
quadrature encoder, and 8 bidirectional TTL lines. The Digital I/O port can be connected to
any appropriate shielded device or connector block using a shielded cable. Refer to the
following image and table for pin locations and functions.
Figure 9.
44-pin Digital I/O Connector
15
30
44
1
16
31
Table 6.
Digital I/O Pin Descriptions
Pin Number
Signal
Description
1
Diff 0+ Bidirectional RS-422 I/O (positive side), or quadrature encoder
phase A+
2
GND
Digital ground reference for TTL and differential I/O
3
TTL 0
Bidirectional TTL I/O
4
TTL 1
Bidirectional TTL I/O
5
GND
Digital ground reference for TTL and differential I/O
6
TTL 2
Bidirectional TTL I/O
7
TTL 3
Bidirectional TTL I/O
8
GND
Digital ground reference for TTL and differential I/O
NI CVS-1459 User Manual
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© National Instruments
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