Table 3. 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
9
Diff 1+
Bidirectional RS-422 I/O (positive side), or quadrature encoder
phase B+
10
V
ISO
Isolated power voltage reference output
11
C
ISO
Common ground reference for isolated inputs and outputs
12
Iso Out 0 General purpose isolated input
13
Iso Out 1 General purpose isolated input
14
C
ISO
Common ground reference for isolated inputs and outputs
15
Iso Out 4 General purpose isolated output
16
Diff 0-
Bidirectional RS-422 I/O (negative side), or quadrature encoder
phase A-
17
GND
Digital ground reference for TTL and differential I/O
18
TTL 4
Bidirectional TTL I/O
19
TTL 5
Bidirectional TTL I/O
20
GND
Digital ground reference for TTL and differential I/O
21
TTL 6
Bidirectional TTL I/O
22
TTL 7
Bidirectional TTL I/O
23
GND
Digital ground reference for TTL and differential I/O
24
Diff 1-
Bidirectional RS-422 I/O (negative side), or quadrature encoder
phase B-
25
V
ISO
Isolated power voltage reference output
IC-317x User Manual
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© National Instruments
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