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Connecting Signals
The following figure shows the I/O connector pin assignments and locations for the
NI USB-7855R.
Caution To ensure the specified EMC performance, operate this product only
with shielded cables and accessories.
Note NI is not liable for connections that exceed any of the maximum ratings
of input or output signals on the NI USB-7855R and on the computer chassis.
For the maximum input and output ratings for each signal, refer to the
NI USB-7855R Specifications, available at
Figure 3. NI USB-7855R Connector Pin Assignments and Locations
GND
GND
GND
DIO0
GND
DIO2
GND
DIO4
GND
DIO6
GND
DIO8
GND
DIO10
GND
DIO12
GND
DIO14
GND
DIO16
GND
DIO18
GND
DIO20
GND
DIO22
GND
DIO24
GND
DIO26
GND
DIO28
GND
DIO30
TERMINAL 34
TERMINAL 68
The +5 V terminals on the I/O connector supply +5 V referenced to GND. Use these terminals
to power external circuitry. The NI USB-7855R is protected from overvoltage and overcurrent
68 34
GND
GND
67 33
66 32
GND
65 31
DIO1
64 30
GND
63 29
DIO3
62 28
GND
61 27
DIO5
60 26
GND
59 25
DIO7
58 24
GND
57 23
DIO9
56 22
GND
55 21
DIO11
54 20
GND
53 19
DIO13
52 18
GND
51 17
DIO15
50 16
GND
49 15
DIO17
48 14
GND
47 13
DIO19
46 12
GND
45 11
DIO21
44 10
GND
43
9
DIO23
42
8
GND
41
7
DIO25
40
6
GND
39
5
DIO27
38
4
GND
37
3
DIO29
36
2
GND
35
1
DIO31
CONNECTOR 0
(DIO)
TERMINAL 1
TERMINAL 35
ni.com/manuals.
AI0+
68 34
AIGND0
67 33
AI1+
66 32
AI2+
65 31
AIGND2
64 30
AI3+
63 29
AI4+
62 28
AIGND4
61 27
AI5+
60 26
AI6+
59 25
AIGND6
58 24
AI7+
57 23
AISENSE
56 22
AO0
55 21
AO1
54 20
AO2
53 19
AO3
52 18
AO4
51 17
AO5
50 16
49 15
AO6
AO7
48 14
47 13
DIO15
DIO13
46 12
DIO11
45 11
DIO9
44 10
DIO7
43
42
DIO6
DIO5
41
40
DIO4
DIO3
39
38
DIO2
DIO1
37
DIO0
36
35
+5V
CONNECTOR 1
(MIO)
TERMINAL 34
TERMINAL 68
NI USB-7855R Getting Started Guide | © National Instruments | 5
AI0–
AIGND1
AI1–
AI2–
AIGND3
AI3–
AI4–
AIGND5
AI5–
AI6–
AIGND7
AI7–
NC
AOGND0
AOGND1
AOGND2
AOGND3
AOGND4
AOGND5
AOGND6
AOGND7
DIO14
DIO12
DIO10
DIO8
9
DGND
8
DGND
7
DGND
6
DGND
5
DGND
4
DGND
3
DGND
2
DGND
1
+5V
TERMINAL 1
TERMINAL 35
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