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USER MANUAL
NI USB-7856R
R Series for USB Multifunction RIO with Kintex-7 160T FPGA
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ni.com/manuals
This document provides compliance, pinout, connectivity, mounting, and power information for the National Instruments USB-7856R.
Safety Guidelines
Caution Do not operate the NI USB-7856R in a manner not specified in this user manual. Product misuse can result in a hazard. You can compromise the safety protection built into the product if the product is damaged in any way. If the product is damaged, return it to National Instruments for repair.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory requirements and limits for electromagnetic compatibility (EMC) as stated in the product specifications. These requirements and limits are designed to provide reasonable protection against harmful interference when the product is operated in its intended operational electromagnetic environment.
This product is intended for use in residential, commercial, and industrial locations. However, harmful interference may occur in some installations or when the product is connected to a peripheral device or a test object. To minimize interference with radio and television reception and prevent unacceptable performance degradation, install and use this product in strict accordance with the instructions in the product documentation.
Furthermore, any changes or modifications to the product not expressly approved by National Instruments could void your authority to operate it under your local regulatory rules.
Caution To ensure the specified EMC performance, operate this product only with shielded cables and accessories.
Caution To ensure the specified EMC performance, you must install the included snap-on ferrite bead onto the DC power cord of the power supply as described in the getting started guide.
Hardware Overview
The following high-level block diagram represents the NI USB-7856R.
Figure 1. NI USB-7856R Block Diagram
CONNECTOR 0 (DIO)
CONNECTOR 1 (MIO)
40 MHz |
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Flash |
OSC |
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Memory |
DIO (x32)
Overvoltage
Protection
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DIO (x16) |
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DIO |
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AI (x8) |
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Overvoltage |
INA |
ADC |
AI |
Kintex-7 |
Data/ |
NI ASIC |
USB |
Protection |
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FPGA |
Address/ |
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Control |
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+5 V |
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FPGA |
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Overvoltage |
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Reference |
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Temperature |
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Protection |
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Overvoltage |
AO (x8) |
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DAC |
AO |
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Protection |
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Device |
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Temperature |
NI USB-7856R |
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Connecting the NI USB-7856R
The NI USB-7856R provides connections for eight analog input (AI) channels, eight analog output (AO) channels, and forty-eight digital input/output (DIO) channels, as shown in Figure 2.
2 | NI USB 7856R User Manual | ni.com
Figure 2. NI USB-7856R Pinout
GND |
68 |
34 |
GND |
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AI0+ |
68 |
34 |
AI0– |
GND |
67 |
33 |
GND |
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AIGND0 |
67 |
33 |
AIGND1 |
GND |
66 |
32 |
GND |
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AI1+ |
66 |
32 |
AI1– |
DIO0 |
65 |
31 |
DIO1 |
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AI2+ |
65 |
31 |
AI2– |
GND |
64 |
30 |
GND |
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AIGND2 |
64 |
30 |
AIGND3 |
DIO2 |
63 |
29 |
DIO3 |
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AI3+ |
63 |
29 |
AI3– |
GND |
62 |
28 |
GND |
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AI4+ |
62 |
28 |
AI4– |
DIO4 |
61 |
27 |
DIO5 |
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AIGND4 |
61 |
27 |
AIGND5 |
GND |
60 |
26 |
GND |
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AI5+ |
60 |
26 |
AI5– |
DIO6 |
59 |
25 |
DIO7 |
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AI6+ |
59 |
25 |
AI6– |
GND |
58 |
24 |
GND |
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AIGND6 |
58 |
24 |
AIGND7 |
DIO8 |
57 |
23 |
DIO9 |
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AI7+ |
57 |
23 |
AI7– |
GND |
56 |
22 |
GND |
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AISENSE |
56 |
22 |
NC |
DIO10 |
55 |
21 |
DIO11 |
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AO0 |
55 |
21 |
AOGND0 |
GND |
54 |
20 |
GND |
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AO1 |
54 |
20 |
AOGND1 |
DIO12 |
53 |
19 |
DIO13 |
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AO2 |
53 |
19 |
AOGND2 |
GND |
52 |
18 |
GND |
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AO3 |
52 |
18 |
AOGND3 |
DIO14 |
51 |
17 |
DIO15 |
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AO4 |
51 |
17 |
AOGND4 |
GND |
50 |
16 |
GND |
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AO5 |
50 |
16 |
AOGND5 |
DIO16 |
49 |
15 |
DIO17 |
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AO6 |
49 |
15 |
AOGND6 |
GND |
48 |
14 |
GND |
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AO7 |
48 |
14 |
AOGND7 |
DIO18 |
47 |
13 |
DIO19 |
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DIO15 |
47 |
13 |
DIO14 |
GND |
46 |
12 |
GND |
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DIO13 |
46 |
12 |
DIO12 |
DIO20 |
45 |
11 |
DIO21 |
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DIO11 |
45 |
11 |
DIO10 |
GND |
44 |
10 |
GND |
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DIO9 |
44 |
10 |
DIO8 |
DIO22 |
43 |
9 |
DIO23 |
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DIO7 |
43 |
9 |
DGND |
GND |
42 |
8 |
GND |
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DIO6 |
42 |
8 |
DGND |
DIO24 |
41 |
7 |
DIO25 |
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DIO5 |
41 |
7 |
DGND |
GND |
40 |
6 |
GND |
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DIO4 |
40 |
6 |
DGND |
DIO26 |
39 |
5 |
DIO27 |
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DIO3 |
39 |
5 |
DGND |
GND |
38 |
4 |
GND |
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DIO2 |
38 |
4 |
DGND |
DIO28 |
37 |
3 |
DIO29 |
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DIO1 |
37 |
3 |
DGND |
GND |
36 |
2 |
GND |
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DIO0 |
36 |
2 |
DGND |
DIO30 |
35 |
1 |
DIO31 |
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+5V |
35 |
1 |
+5V |
CONNECTOR 0 |
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CONNECTOR 1 |
(DIO) |
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(MIO) |
TERMINAL 34 |
TERMINAL 1 |
TERMINAL 34 |
TERMINAL 1 |
TERMINAL 68 |
TERMINAL 35 |
TERMINAL 68 |
TERMINAL 35 |
Connectivity Options
Use the following connection accessories and cables to access the signals on the I/O connectors.
NI USB 7856R User Manual | © National Instruments | 3
Table 1. Connection Accessories and Cables
Connector |
Accessory |
Accessory |
Cable |
Cable |
Type |
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Description |
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Description |
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MIO |
NI SCB-68A |
A 68-pin, |
NI SHC68-68-RMIO |
A shielded, |
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(782536-01) |
shielded I/O |
(189588-01, 1 meter) or |
68-conductor |
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connector |
(189588-02, 2 meter) |
cable |
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block |
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DIO |
NI SCB-68 HSDIO |
A 68-pin, |
NI SHC68-C68-RDIO2 |
A shielded, |
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(782914-01) |
shielded |
(156166-01, 1 meter) or |
digital I/O |
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high-speed |
(156166-02, 2 meter) |
68-conductor |
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digital |
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cable |
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connector |
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block |
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Analog Input
The NI USB-7856R provides connections for eight AI channels. Each channel has an AI+ pin, AIpin, and AIGND pin to which you can connect both single-ended or differential voltage signals. Use the AISENSE pin to connect non-referenced single-ended signals.
Connecting Single-Ended Voltage Signals
To connect referenced single-ended voltage signals to the NI USB-7856R, you must connect the voltage ground signal to AI GND in order to keep the common-mode voltage in the specified range, as shown in Figure 3.
Figure 3. Connecting Referenced Single-Ended Signals to the NI USB-7856R
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AI+ |
Overvoltage |
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Protection |
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AI– |
PGIA |
ADC |
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+ |
Overvoltage |
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V1 |
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Protection |
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– |
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AISENSE |
Overvoltage |
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AIGND |
Protection |
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Connection |
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Accessory |
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NI USB-7856R |
To connect non-referenced single-ended voltage signals to the NI USB-7856R, you must connect the voltage ground signal to AI SENSE in order to keep the common-mode voltage in the specified range, as shown in Figure 4.
4 | NI USB 7856R User Manual | ni.com
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