National Instruments IC-3121, Руководство пользователя, Страница: 11 / 33

Table 6. Digital I/O Pin Descriptions (Continued)
Pin Number Signal Description
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
25 V
ISO
Isolated power voltage reference output
26 C
ISO
Common ground reference for isolated inputs and outputs
27 Iso Out 2 General purpose isolated output
28 Iso Out 3 General purpose isolated output
29 C
ISO
Common ground reference for isolated inputs and outputs
30 Iso Out 5 General purpose isolated output
10
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IC-3121 User Manual