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© National Instruments Corporation 7 NI USB-6221/6229/6251/6259 OEM User Guide
Figure 6. USB-6251 OEM Connector Pinout
AO 0
AO 1
AI GND
AI GND
AI GND
AI 8
AI 1
AI GND
AI 10
AI 3
AI GND
AI 12
AI 5
AI GND
AI 14
AI 7
AI GND
AO GND
AO GND
APFI 0
AI 0
AI GND
AI 9
AI 2
AO GND
AI SENSE
AI GND
AI 11
AI 4
AI GND
AI 13
AI 6
AI GND
AI 15
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
PFI 0
PFI 1
PFI 2
PFI 3
PFI 4
PFI 5
PFI 6
PFI 7
PFI 8
PFI 9
PFI 10
PFI 11
PFI 12
PFI 13
PFI 14
PFI 15
+5 V
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
+5 V
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
Bank 0
Bank 0
50-Pin Digital Connector
34-Pin Analog Connector