Table 5. USB 3.0 Port Pin Descriptions (Continued)
Pin
Signal Name
Signal Description
8
StdA_SSTX-
SuperSpeed transmitter differential pair
9
St
Digital I/O
The 44-pin Digital I/O port on the IC-3121 offers 8 isolated inputs, 8 isolated outputs, 2
bidirectional differential inputs (RS-422) or single-ended input lines that 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.
NI recommends the following digital I/O cables for the IC-3121.
Cable
Part Number
44-pin D-sub male to pigtail cable
156083-03 for 3 meter cable
44-pin D-sub male to 44-position D-sub female cable
156084-03 for 3 meter cable
156084-0R5 for 0.5 meter cable
Refer to the following image and table for pin locations and descriptions.
Figure 9. 44-pin Digital I/O Connector Pin Locations
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
IC-3121 User Manual
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© National Instruments
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