National Instruments Computer Drive 622x User Manual

USER GUIDE  
NI USB-622x/625x/628x OEM  
M Series USB-6221/6225/6229/6251/6255/6259/6281/6289 OEM Devices  
This document provides dimensions, pinouts, and information  
about the connectors, switch, LEDs, and chassis ground of the National  
Instruments USB-6221 OEM, USB-6225 OEM, USB-6229 OEM,  
USB-6251 OEM, USB-6255 OEM, USB-6259 OEM, USB-6281 OEM,  
and USB-6289 OEM devices. It also explains how to modify the USB  
device name in Microsoft Windows.  
Caution There are no product safety, electromagnetic compatibility (EMC), or  
CE marking compliance claims made for the USB-622x/625x/628x OEM devices.  
Conformity to any and all compliance requirements rests with the end product supplier.  
Caution (USB-628x Devices) Exercise caution when placing USB-628x OEM devices inside  
an enclosure. Auxiliary cooling may be necessary to keep the device under the maximum  
ambient temperature rating of 45 °C, as specified in the NI 628x Specifications.  
Figure 1 shows the USB-6221/6251/6281 OEM and  
USB-6225/6229/6255/6259/6289 OEM devices.  
USB-6221/6251/6281  
USB-6225/6229/6255/6259/6289  
Figure 1. USB-622x/625x/628x OEM Devices  
 
 
4X Ø 0.110 (2.79)  
7X Ø 0.125 (3.18)  
6.950 (176.53)  
4x 6.718 (170.63)  
6.270 (159.26)  
6.140 (155.96)  
5.930 (150.62)  
6.140 (155.96)  
5.290 (134.37)  
0.396 (10.06)  
0.304 (7.72)  
0.256 (6.50)  
0.116 (2.95)  
0.000 (0.00)  
0.304 (7.72)  
0.200 (5.08)  
0.436 (11.07)  
0.392 (9.96)  
0.362 (9.19)  
0.162 (4.11)  
0.062 (1.57)  
0.000 (0.00)  
0.609 (15.47)  
0.515 (13.08)  
0.442 (11.23)  
2X Ø 0.140 Cutout  
in Panel for LEDs  
Ø 0.330 Cutout in Panel  
for Power Connector  
Figure 2. USB-6221/6251/6281 OEM Dimensions in Inches (Millimeters)  
© National Instruments Corporation  
3
NI USB-622x/625x/628x OEM User Guide  
 
 
Figure 3 shows the dimensions of the USB-6225/6229/6255/6259/6289  
OEM device.  
4X Ø 0.110 (2.79)  
7X Ø 0.125 (3.18)  
6.950 (176.53)  
4x 6.718 (170.63)  
6.270 (159.26)  
6.140 (155.96)  
5.930 (150.62)  
5.839 (148.31)  
5.499 (139.67)  
6.140 (155.96)  
5.290 (134.37)  
0.396 (10.06)  
0.304 (7.72)  
0.256 (6.50)  
0.116 (2.95)  
0.000 (0.00)  
0.304 (7.72)  
0.200 (5.08)  
0.436 (11.07)  
0.392 (9.96)  
0.362 (9.19)  
0.162 (4.11)  
0.062 (1.57)  
0.000 (0.00)  
0.609 (15.47)  
0.515 (13.08)  
0.442 (11.23)  
2X Ø 0.140 Cutout  
in Panel for LEDs  
Ø 0.330 Cutout in Panel  
for Power Connector  
Figure 3. USB-6225/6229/6255/6259/6289 OEM Dimensions in Inches (Millimeters)  
NI USB-622x/625x/628x OEM User Guide  
4
ni.com  
 
 
I/O Connector Pinouts  
Figures 4 through 9 show the connector pinouts for the USB-6221 OEM,  
USB-6225 OEM, USB-6229 OEM, USB-6251 OEM, USB-6255 OEM,  
USB-6259 OEM, USB-6281 OEM, and USB-6289 OEM devices.  
Refer to the M Series User Manual at ni.com/manualsfor more  
information about USB-622x/625x/628x signals and how to connect them.  
© National Instruments Corporation  
5
NI USB-622x/625x/628x OEM User Guide  
 
Bank 0  
50-Pin Digital Connector  
+5 V  
50 49 +5 V  
48 47 PFI 15  
46 45 PFI 14  
44 43 PFI 13  
42 41 PFI 12  
40 39 PFI 11  
38 37 PFI 10  
36 35 PFI 9  
34 33 PFI 8  
32 31 PFI 7  
30 29 PFI 6  
28 27 PFI 5  
26 25 PFI 4  
24 23 PFI 3  
22 21 PFI 2  
20 19 PFI 1  
18 17 PFI 0  
16 15 P0.7  
14 13 P0.6  
12 11 P0.5  
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  
Bank 0  
10  
8
9
7
5
3
1
P0.4  
P0.3  
P0.2  
P0.1  
P0.0  
6
4
2
Bank 0  
34-Pin Analog Connector  
AI GND 34 33 AI 15  
AI 7  
32 31 AI GND  
30 29 AI 6  
AI 14  
AI GND 28 27 AI 13  
AI 5  
26 25 AI GND  
24 23 AI 4  
AI 12  
AI GND 22 21 AI 11  
AI 3  
20 19 AI GND  
18 17 AI 2  
AI 10  
AI GND 16 15 AI 9  
AI 1  
AI 8  
14 13 AI GND  
12 11 AI 0  
Bank 0  
AI GND 10  
9
7
5
3
1
AI SENSE  
NC  
AI GND  
AI GND  
AO 1  
8
6
4
2
AO GND  
AO GND  
AO GND  
AO 0  
NC = No Connect  
Figure 4. USB-6221 OEM Connector Pinout  
NI USB-622x/625x/628x OEM User Guide  
6
ni.com  
 
 
Bank 1  
Bank 0  
50-Pin Analog/Digital  
Connectors  
+5 V  
50 49 +5 V  
48 47 PFI 15  
46 45 PFI 14  
44 43 PFI 13  
42 41 PFI 12  
40 39 PFI 11  
38 37 PFI 10  
36 35 PFI 9  
34 33 PFI 8  
32 31 PFI 7  
30 29 PFI 6  
28 27 PFI 5  
26 25 PFI 4  
24 23 PFI 3  
22 21 PFI 2  
20 19 PFI 1  
18 17 PFI 0  
16 15 P0.7  
14 13 P0.6  
12 11 P0.5  
AI 71  
AI 78  
50 49 AI 79  
48 47 AI 70  
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  
AI GND 46 45 AI 69  
AI 77  
AI 68  
AI 67  
AI 74  
44 43 AI 76  
42 41 AI GND  
40 39 AI 75  
38 37 AI 66  
AI GND 36 35 AI 65  
AI 73  
AI 64  
AI 55  
AI 62  
34 33 AI 72  
32 31 AI GND  
30 29 AI 63  
28 27 AI 54  
AI GND 26 25 AI 53  
Bank 1  
Bank 0  
AI 61  
AI 52  
AI 51  
AI 58  
24 23 AI 60  
22 21 AI GND  
20 19 AI 59  
18 17 AI 50  
AI GND 16 15 AI 49  
AI 57  
AI 48  
AI 39  
AI 46  
AI GND  
AI 45  
AI 44  
14 13 AI 56  
12 11 AI GND  
10  
8
9
7
5
3
1
P0.4  
P0.3  
P0.2  
P0.1  
P0.0  
10  
8
9
7
5
3
1
AI 47  
AI 38  
AI 37  
AI GND  
AI 36  
6
6
4
4
2
2
Bank 1  
Bank 0  
34-Pin Analog Connectors  
AI 43  
34 33 AI 35  
AI GND 34 33 AI 15  
AI GND 32 31 AI 34  
AI 7  
32 31 AI GND  
30 29 AI 6  
AI 42  
AI 33  
AI 32  
AI 31  
30 29 AI 41  
28 27 AI GND  
26 25 AI 40  
24 23 AI 23  
AI 14  
AI GND 28 27 AI 13  
AI 5  
26 25 AI GND  
24 23 AI 4  
AI 12  
AI GND 22 21 AI 22  
AI GND 22 21 AI 11  
AI 30  
AI 21  
AI 28  
20 19 AI 29  
18 17 AI GND  
16 15 AI 20  
AI 3  
20 19 AI GND  
18 17 AI 2  
AI 10  
AI GND 16 15 AI 9  
AI GND 14 13 AI 27  
AI 1  
AI 8  
14 13 AI GND  
12 11 AI 0  
AI 19  
12 11 AI GND  
Bank 1  
Bank 0  
AI 26  
10  
8
9
7
5
3
1
AI 18  
AI GND 10  
9
7
5
3
1
AI SENSE  
NC  
AI GND  
AI 17  
AI 25  
AI GND  
AI GND  
AO 1  
8
6
4
2
6
AI GND  
AI 16  
AO GND  
AO GND  
AO GND  
AI 24  
4
AI GND  
2
AI SENSE 2  
AO 0  
NC = No Connect  
Figure 5. USB-6225 OEM Connector Pinout  
© National Instruments Corporation  
7
NI USB-622x/625x/628x OEM User Guide  
 
Bank 1  
Bank 0  
50-Pin Digital Connectors  
+5 V  
50 49 +5 V  
48 47 P0.31  
46 45 P0.30  
44 43 P0.29  
42 41 P0.28  
40 39 P0.27  
38 37 P0.26  
36 35 P0.25  
34 33 P0.24  
32 31 P0.23  
30 29 P0.22  
28 27 P0.21  
26 25 P0.20  
24 23 P0.19  
22 21 P0.18  
20 19 P0.17  
18 17 P0.16  
16 15 P0.15  
14 13 P0.14  
12 11 P0.13  
+5 V  
50 49 +5 V  
48 47 PFI 15  
46 45 PFI 14  
44 43 PFI 13  
42 41 PFI 12  
40 39 PFI 11  
38 37 PFI 10  
36 35 PFI 9  
34 33 PFI 8  
32 31 PFI 7  
30 29 PFI 6  
28 27 PFI 5  
26 25 PFI 4  
24 23 PFI 3  
22 21 PFI 2  
20 19 PFI 1  
18 17 PFI 0  
16 15 P0.7  
14 13 P0.6  
12 11 P0.5  
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  
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  
Bank 1  
Bank 0  
10  
8
9
7
5
3
1
P0.12  
P0.11  
P0.10  
P0.9  
10  
8
9
7
5
3
1
P0.4  
P0.3  
P0.2  
P0.1  
P0.0  
6
6
4
4
2
P0.8  
2
Bank 1  
Bank 0  
34-Pin Analog Connectors  
AI GND 34 33 AI 31  
AI GND 34 33 AI 15  
AI 23  
AI 30  
32 31 AI GND  
30 29 AI 22  
AI 7  
32 31 AI GND  
30 29 AI 6  
AI 14  
AI GND 28 27 AI 29  
AI GND 28 27 AI 13  
AI 21  
AI 28  
26 25 AI GND  
24 23 AI 20  
AI 5  
26 25 AI GND  
24 23 AI 4  
AI 12  
AI GND 22 21 AI 27  
AI GND 22 21 AI 11  
AI 19  
AI 26  
20 19 AI GND  
18 17 AI 18  
AI 3  
20 19 AI GND  
18 17 AI 2  
AI 10  
AI GND 16 15 AI 25  
AI GND 16 15 AI 9  
AI 17  
AI 24  
14 13 AI GND  
12 11 AI 16  
AI 1  
AI 8  
14 13 AI GND  
12 11 AI 0  
Bank 1  
Bank 0  
AI GND 10  
9
7
5
3
1
AI SENSE 2  
NC  
AI GND 10  
9
7
5
3
1
AI SENSE  
NC  
AI GND  
AI GND  
AO 3  
8
6
4
2
AI GND  
AI GND  
AO 1  
8
6
4
2
AO GND  
AO GND  
AO GND  
AO GND  
AO GND  
AO GND  
AO 2  
AO 0  
NC = No Connect  
NC = No Connect  
Figure 6. USB-6229 OEM Connector Pinout  
NI USB-622x/625x/628x OEM User Guide  
8
ni.com  
 
Bank 0  
50-Pin Digital Connector  
+5 V  
50 49 +5 V  
48 47 PFI 15  
46 45 PFI 14  
44 43 PFI 13  
42 41 PFI 12  
40 39 PFI 11  
38 37 PFI 10  
36 35 PFI 9  
34 33 PFI 8  
32 31 PFI 7  
30 29 PFI 6  
28 27 PFI 5  
26 25 PFI 4  
24 23 PFI 3  
22 21 PFI 2  
20 19 PFI 1  
18 17 PFI 0  
16 15 P0.7  
14 13 P0.6  
12 11 P0.5  
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  
Bank 0  
10  
8
9
7
5
3
1
P0.4  
P0.3  
P0.2  
P0.1  
P0.0  
6
4
2
Bank 0  
34-Pin Analog Connector  
AI GND 34 33 AI 15  
AI 7  
32 31 AI GND  
30 29 AI 6  
AI 14  
AI GND 28 27 AI 13  
AI 5  
26 25 AI GND  
24 23 AI 4  
AI 12  
AI GND 22 21 AI 11  
AI 3  
20 19 AI GND  
18 17 AI 2  
AI 10  
AI GND 16 15 AI 9  
AI 1  
AI 8  
14 13 AI GND  
12 11 AI 0  
Bank 0  
AI GND 10  
9
7
5
3
1
AI SENSE  
APFI 0  
AI GND  
AI GND  
AO 1  
8
6
4
2
AO GND  
AO GND  
AO GND  
AO 0  
Figure 7. USB-6251/6281 OEM Connector Pinout  
© National Instruments Corporation  
9
NI USB-622x/625x/628x OEM User Guide  
 
Bank 1  
Bank 0  
50-Pin Analog/Digital  
Connectors  
+5 V  
50 49 +5 V  
48 47 PFI 15  
46 45 PFI 14  
44 43 PFI 13  
42 41 PFI 12  
40 39 PFI 11  
38 37 PFI 10  
36 35 PFI 9  
34 33 PFI 8  
32 31 PFI 7  
30 29 PFI 6  
28 27 PFI 5  
26 25 PFI 4  
24 23 PFI 3  
22 21 PFI 2  
20 19 PFI 1  
18 17 PFI 0  
16 15 P0.7  
14 13 P0.6  
12 11 P0.5  
AI 71  
AI 78  
50 49 AI 79  
48 47 AI 70  
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  
AI GND 46 45 AI 69  
AI 77  
AI 68  
AI 67  
AI 74  
44 43 AI 76  
42 41 AI GND  
40 39 AI 75  
38 37 AI 66  
AI GND 36 35 AI 65  
AI 73  
AI 64  
AI 55  
AI 62  
34 33 AI 72  
32 31 AI GND  
30 29 AI 63  
28 27 AI 54  
AI GND 26 25 AI 53  
Bank 1  
Bank 0  
AI 61  
AI 52  
AI 51  
AI 58  
24 23 AI 60  
22 21 AI GND  
20 19 AI 59  
18 17 AI 50  
AI GND 16 15 AI 49  
AI 57  
AI 48  
AI 39  
AI 46  
AI GND  
AI 45  
AI 44  
14 13 AI 56  
12 11 AI GND  
10  
8
9
7
5
3
1
P0.4  
P0.3  
P0.2  
P0.1  
P0.0  
10  
8
9
7
5
3
1
AI 47  
AI 38  
AI 37  
AI GND  
AI 36  
6
6
4
4
2
2
Bank 1  
Bank 0  
34-Pin Analog Connectors  
AI 43  
34 33 AI 35  
AI GND 34 33 AI 15  
AI GND 32 31 AI 34  
AI 7  
32 31 AI GND  
30 29 AI 6  
AI 42  
AI 33  
AI 32  
AI 31  
30 29 AI 41  
28 27 AI GND  
26 25 AI 40  
24 23 AI 23  
AI 14  
AI GND 28 27 AI 13  
AI 5  
26 25 AI GND  
24 23 AI 4  
AI 12  
AI GND 22 21 AI 22  
AI GND 22 21 AI 11  
AI 30  
AI 21  
AI 28  
20 19 AI 29  
18 17 AI GND  
16 15 AI 20  
AI 3  
20 19 AI GND  
18 17 AI 2  
AI 10  
AI GND 16 15 AI 9  
AI GND 14 13 AI 27  
AI 1  
AI 8  
14 13 AI GND  
12 11 AI 0  
AI 19  
12 11 AI GND  
Bank 1  
Bank 0  
AI 26  
10  
8
9
7
5
3
1
AI 18  
AI GND 10  
9
7
5
3
1
AI SENSE  
APFI 0  
AI GND  
AI 17  
AI 25  
AI GND  
AI GND  
AO 1  
8
6
4
2
6
AI GND  
AI 16  
AO GND  
AO GND  
AO GND  
AI 24  
4
AI GND  
2
AI SENSE 2  
AO 0  
Figure 8. USB-6255 OEM Connector Pinout  
NI USB-622x/625x/628x OEM User Guide  
10  
ni.com  
 
Bank 1  
Bank 0  
50-Pin Digital Connectors  
+5 V  
50 49 +5 V  
48 47 P0.31  
46 45 P0.30  
44 43 P0.29  
42 41 P0.28  
40 39 P0.27  
38 37 P0.26  
36 35 P0.25  
34 33 P0.24  
32 31 P0.23  
30 29 P0.22  
28 27 P0.21  
26 25 P0.20  
24 23 P0.19  
22 21 P0.18  
20 19 P0.17  
18 17 P0.16  
16 15 P0.15  
14 13 P0.14  
12 11 P0.13  
+5 V  
50 49 +5 V  
48 47 PFI 15  
46 45 PFI 14  
44 43 PFI 13  
42 41 PFI 12  
40 39 PFI 11  
38 37 PFI 10  
36 35 PFI 9  
34 33 PFI 8  
32 31 PFI 7  
30 29 PFI 6  
28 27 PFI 5  
26 25 PFI 4  
24 23 PFI 3  
22 21 PFI 2  
20 19 PFI 1  
18 17 PFI 0  
16 15 P0.7  
14 13 P0.6  
12 11 P0.5  
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  
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  
Bank 1  
Bank 0  
10  
8
9
7
5
3
1
P0.12  
P0.11  
P0.10  
P0.9  
10  
8
9
7
5
3
1
P0.4  
P0.3  
P0.2  
P0.1  
P0.0  
6
6
4
4
2
P0.8  
2
Bank 1  
Bank 0  
34-Pin Analog Connectors  
AI GND 34 33 AI 31  
AI GND 34 33 AI 15  
AI 23  
AI 30  
32 31 AI GND  
30 29 AI 22  
AI 7  
32 31 AI GND  
30 29 AI 6  
AI 14  
AI GND 28 27 AI 29  
AI GND 28 27 AI 13  
AI 21  
AI 28  
26 25 AI GND  
24 23 AI 20  
AI 5  
26 25 AI GND  
24 23 AI 4  
AI 12  
AI GND 22 21 AI 27  
AI GND 22 21 AI 11  
AI 19  
AI 26  
20 19 AI GND  
18 17 AI 18  
AI 3  
20 19 AI GND  
18 17 AI 2  
AI 10  
AI GND 16 15 AI 25  
AI GND 16 15 AI 9  
AI 17  
AI 24  
14 13 AI GND  
12 11 AI 16  
AI 1  
AI 8  
14 13 AI GND  
12 11 AI 0  
Bank 1  
Bank 0  
AI GND 10  
9
7
5
3
1
AI SENSE 2  
APFI 1  
AI GND 10  
9
7
5
3
1
AI SENSE  
APFI 0  
AI GND  
AI GND  
AO 3  
8
6
4
2
AI GND  
AI GND  
AO 1  
8
6
4
2
AO GND  
AO GND  
AO GND  
AO GND  
AO GND  
AO GND  
AO 2  
AO 0  
Figure 9. USB-6259/6289 OEM Connector Pinout  
© National Instruments Corporation  
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Default Counter/Timer Pinouts  
By default, NI-DAQmx routes the counter/timer inputs and outputs to the  
PFI pins, shown in Table 1.  
Table 1. NI-DAQmx Default Counter/Timer Pins  
Counter/Timer Signal  
CTR 0 SRC  
CTR 0 GATE  
CTR 0 AUX  
CTR 0 OUT  
CTR 0 A  
Default Terminal Name  
PFI 8  
PFI 9  
PFI 10  
PFI 12  
PFI 8  
CTR 0 Z  
PFI 9  
CTR 0 B  
PFI 10  
PFI 3  
CTR 1 SRC  
CTR 1 GATE  
CTR 1 AUX  
CTR 1 OUT  
CTR 1 A  
PFI 4  
PFI 11  
PFI 13  
PFI 3  
CTR 1 Z  
PFI 4  
CTR 1 B  
PFI 11  
PFI 14  
FREQ OUT  
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Attaching External LEDs  
USB-622x/625x/628x OEM devices have two LEDs that reflect the device  
state. The green READY LED indicates when the device is powered on and  
configured as a USB device. The yellow ACTIVE LED indicates USB bus  
activity.  
Three connectors on the device allow you to connect an external LED  
circuit to the device, as shown in Figure 10. To connect an external READY  
LED, use E1 as the positive connection (+3.3 V) and E2 as the negative  
connection. To connect an external ACTIVE LED, use E1 as the positive  
connection and E3 as the negative connection. E1 is current limited with  
a 100 Ω resistor to the 3.3 V internal supply. This configuration limits  
the current to approximately 16 mA into a single external LED or  
approximately 8 mA each when both LEDs are lit. You also can limit this  
current further by using external resistors, also shown in Figure 10.  
OEM (On-Board)  
3.3 V  
E3  
E2  
E1  
100 Ω  
E3  
E2  
E1  
External External  
READY ACTIVE  
LED  
LED  
Figure 10. Schematic for External LED Circuits  
© National Instruments Corporation  
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NI USB-622x/625x/628x OEM User Guide  
 
 
Power Switch  
The power switch on the USB-622x/625x/628x OEM device powers the  
device on and off. Figure 11 shows the pins on the power switch and  
circuitry.  
100 kΩ  
to Ground  
VDC Out  
VDC In  
3
2
1
J4/J6/J8  
SW1  
Switch  
NC NC  
100 kΩ  
Outer  
Shell  
J4/J6/J8  
XF1  
SW1  
2
1
Power to  
Device  
Power  
Connector  
FUSE  
3
100 kΩ  
Figure 11. Schematic for the Power Switch  
Pin 1, VDC In, is connected to VDC through the fuse (reference designator  
XF1). The VDC is the voltage provided by the power supply through the  
power connector (reference designator J4/J6/J81) and must be 11–30 VDC,  
20 W.  
Pin 2, VDC Out, provides power to the circuitry on the device. When the  
switch is in the On position, the VDC power supply from pin 1 is routed to  
pin 2.  
Pin 3, 100 kΩ to Ground, connects pin 2 to ground through a 100 kΩ  
resistor when the switch is in the Off position.  
1
The power connector is designated as J4 on USB-6225/6255 OEM devices, J6 on USB-6221/6229 OEM devices, and J8 on  
USB-6251/6259/6281/6289 OEM devices.  
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Connecting the USB-622x/625x/628x OEM Device to  
Your Chassis  
The USB-622x/625x/628x OEM device includes several plated mounting  
holes that are designed for customer grounded connections, as shown in  
Figure 12.  
Caution Do not use the holes labeled A in Figure 12 as mounting holes.  
A
A
A
Mounting Hole Connected  
to Chassis Ground  
Do Not Use These  
as Mounting Holes  
A
Figure 12. Customer Mounting Holes  
(USB-6225/6229/6255/6259/6289 OEM Shown)  
Caution (USB-628x Devices) Exercise caution when placing USB-628x OEM devices inside  
an enclosure. Auxiliary cooling may be necessary to keep the device under the maximum  
ambient temperature rating of 45 °C, as specified in the NI 628x Specifications.  
© National Instruments Corporation  
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Replacing Fuses  
USB-622x/625x/628x OEM devices have a replaceable T 2A 250V  
(5 × 20 mm) fuse that protects the device from overcurrent through the  
power connector.  
(USB-628x Devices Only) USB-628x OEM devices also have a replaceable  
F 2A 125V fuse that protects the device from overcurrent through the +5 V  
terminal(s).  
Replacement fuse information can be found in Table 2. To replace a broken  
fuse in USB-622x/625x/628x OEM devices, complete the following steps.  
1. Power down and unplug the device.  
2. Replace the broken fuse while referring to Figure 13 for the fuse  
locations.  
2
1
1
2
T 2A 250V (5 x 20 mm) Fuse  
F 2A 125V Fuse on USB-628x OEM Devices  
Figure 13. USB-622x/625x/628x OEM Fuse Locations  
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Device Components  
Table 2 contains information about the components used for interfacing  
and interacting with the USB-622x/625x/628x OEM device.  
Table 2. USB-622x/625x/628x OEM Components  
Manufacturer  
Part Number  
Component  
LEDs  
Reference Designator(s) on PCB  
Manufacturer  
Dialight  
DS1  
553-0332  
34-pin connectors (USB-6221/6251/6281 OEM) J1  
3M  
N2534-6002RB  
(USB-6225/6229/6255/6259/6289  
OEM) J1, J2  
50-pin connectors (USB-6221/6251/6281 OEM) P1  
3M  
N2550-6002UB  
(USB-6225/6229/6255/6259/6289  
OEM) P1, P2  
USB connector  
Power connector  
J3  
AMP  
787780-1  
722RA  
(USB-6221/6229 OEM) J6  
(USB-6225/6255 OEM) J4  
(USB-6251/6259/6281/6289 OEM) J8  
SW1  
Switchcraft  
Power switch  
ITT Industries,  
Cannon  
E101J1A3QE2  
T 2A 250V fuse  
F 2A 125V fuse  
XF1  
Littelfuse  
Littelfuse  
Honda  
218.002XP  
(USB-6281/6289 OEM) F1  
(USB-6221 OEM) J8  
0453002  
68-pin  
connectors*  
PCS-E68RLMD1+  
(USB-6225/6229/6255 OEM) J7, J8  
(USB-6251/6281 OEM) J7  
(USB-6259/6289 OEM) J6, J7  
* Optional mass termination connectors. These are not populated by default.  
© National Instruments Corporation  
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Modifying the USB Device Name in Microsoft Windows  
You can change how the USB-622x/625x/628x OEM device name appears  
when users install the device in both the Found New Hardware Wizard that  
appears when the device is initially installed and in the Windows Device  
Manager.  
Windows Vista/XP Users  
Figure 14 depicts how a USB-6251 OEM device name appears in the  
Found New Hardware Wizard and Windows Device Manager.  
Figure 14. USB-6251 OEM Device in the Found New Hardware Wizard and  
Device Manager (Windows Vista/XP)  
To modify the device name in the Found New Hardware Wizard and  
Windows Device Manager in Microsoft Windows Vista/XP, complete the  
following steps.  
Note You must have NI-DAQmx 8.7 or later installed on your PC.  
1. Locate the OEMx.inffile in the y:\WINDOWS\inf\directory,  
where xis the random number assigned to the INF file by Windows,  
and y:\is the root directory where Windows is installed.  
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Note New security updates to Microsoft Vista and NI-DAQ 8.6 or later create random INF  
files for NI hardware. Windows assigns random file numbers to all INF files, which causes  
the user to search through several INF files until the correct file is located.  
If you want to revert back, save a copy of this file as  
OEMx_original.infin a different location.  
2. Edit the device INF file by opening OEMx.infwith a text editor.  
At the bottom of this file are the descriptors where Windows looks to  
identify the device. Locate the two lines of text that contain in quotes  
the descriptors for the device name you are modifying. Change the  
descriptor on both lines to the new device name, as shown in Figure 15.  
Original File  
Modified File  
Figure 15. INF File Descriptors Changed to “My Device” (Windows Vista/XP)  
3. Save and close the INF file.  
4. Go to the Windows Device Manager.  
(Windows Vista) In the Device Manager, notice that the OEM device  
now appears as My Device, as shown in Figure 16.  
(Windows XP) In the Device Manager, right-click the OEM device under  
Data Acquisition Devices, and select Uninstall. Power down the OEM  
device and disconnect the USB cable from your PC.  
© National Instruments Corporation  
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When you reconnect and power on the device, it appears as My Devicein  
the Found New Hardware Wizard and Windows Device Manager, as shown  
in Figure 16.  
Note When the device is initially installed, the Windows alert message may display the  
following: Found New Hardware: M Series USB 62xx (OEM). This message appears  
for a few seconds until the custom name appears and the Found New Hardware Wizard is  
launched. This alert message device name cannot be changed.  
Figure 16. “My Device” in the Found New Hardware Wizard and  
Device Manager (Windows Vista/XP)  
Note Modifying the INF file will not change the USB-622x/625x/628x OEM device name  
in Measurement & Automation Explorer (MAX).  
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Windows 2000 Users  
Figure 17 depicts how a USB-6251 OEM device name appears in the  
Found New Hardware Wizard and Windows Device Manager.  
Figure 17. USB-6251 OEM Device in the Found New Hardware Wizard and  
Device Manager (Windows 2000)  
To modify the device name in the Found New Hardware Wizard and  
Windows Device Manager in Windows 2000, complete the following steps.  
Note You must have NI-DAQmx 8.7 or later installed on your PC.  
1. Locate the nimioxsu.inffile in the x:\WINNT\inf\directory,  
where x:\is the root directory where Windows is installed.  
If you want to revert back, save a copy of this file as  
nimioxsu_original.infin a different location.  
© National Instruments Corporation  
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2. Edit the device INF file by opening nimioxsu.infwith a text editor.  
At the bottom of this file are the descriptors where Windows looks to  
identify the device. Locate the two lines of text that contain in quotes  
the descriptors for the device name you are modifying. Change the  
descriptor on both lines to the new device name, as shown in Figure 18.  
Original File  
Modified File  
Figure 18. INF File Descriptors Changed to “My Device” (Windows 2000)  
3. Save and close the INF file.  
4. Go to the Windows Device Manager, right-click the OEM device under  
Data Acquisition Devices, and select Uninstall.  
5. Power down the OEM device and disconnect the USB cable from  
your PC.  
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When you reconnect and power on the device, it appears as My Devicein  
the Found New Hardware Wizard and Windows Device Manager, as shown  
in Figure 19.  
Note When the device is initially installed, the Windows alert message may display the  
following: Found New Hardware: M Series USB 62xx (OEM). This message appears  
for a few seconds until the custom name appears and the Found New Hardware Wizard is  
launched. This alert message device name cannot be changed.  
Figure 19. “My Device” in the Found New Hardware Wizard and  
Device Manager (Windows 2000)  
Note Modifying the INF file will not change the USB-622x/625x/628x OEM device name  
in Measurement & Automation Explorer (MAX).  
National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation.  
Refer to the Terms of Use section on ni.com/legalfor more information about National  
Instruments trademarks. Other product and company names mentioned herein are trademarks or trade  
names of their respective companies. For patents covering National Instruments products, refer to the  
appropriate location: Help»Patents in your software, the patents.txtfile on your media, or  
ni.com/patents.  
© 2006–2008 National Instruments Corporation. All rights reserved.  
371910E-01  
Jun08  
 
 

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