National Instruments NI 785xR User Manual

Page 63

Appendix A

Connecting I/O Signals

A-8

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You can plug each of these 50-pin headers directly into an 8-, 16-, 24-,
or 32-channel SSR backplane for digital signal conditioning. One of the
50-pin headers contains DIO<0..23> from the NI 78xxR RDIO connector.
These lines correspond to Slots <0..23> on an SSR backplane in sequential
order. The other 50-pin header contains DIO<24..39> from the NI 78xxR
RDIO connector. These lines correspond to Slots <0..15> on an SSR
backplane in sequential order. You can connect to an SSR backplane
containing a number of channels unequal to the number of lines on the
NSC68-5050 cable header. In this case, you have access only to the
channels that exist on both the SSR backplane and the NSC68-5050 cable
header you are using.

Figure A-4 shows the connector pinouts when using the NSC68-5050
cable.

Figure A-4. Connector Pinouts when Using the NSC68-5050 Cable

2
4
6
8

10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50

1
3
5
7
9

11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49

DIO23
DIO22
DIO21
DIO20
DIO19
DIO18
DIO17
DIO16
DIO15
DIO14
DIO13
DIO12
DIO11
DIO10

DIO9
DIO8
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0

+5V

No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND

2
4
6
8

10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50

1
3
5
7
9

11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49

No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect

DIO39
DIO38
DIO37
DIO36
DIO35
DIO34
DIO33
DIO32
DIO31
DIO30
DIO29
DIO28
DIO27
DIO26
DIO25
DIO24

+5V

No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
No Connect
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND

DIO 0–23 Connector

Pin Assignment

DIO 24–39 Connector

Pin Assignment