National Instruments NI USB-7856R User Manual

USER MANUAL

NI USB-7856R

R Series for USB Multifunction RIO with Kintex-7 160T FPGA

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This document provides compliance, pinout, connectivity, mounting, and power information
for the National Instruments USB-7856R.

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简体中文

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

Device

Temperature

Overvoltage

Protection

Overvoltage

Protection

FPGA

Temperature

40 MHz

OSC

AO (x8)

USB

NI ASIC

Kintex-7

FPGA

NI USB-7856R

Flash

Memory

DIO

+5 V

Reference

DAC

AO

ADC

AI

CONNECTOR 0

(DIO)

CONNECTOR 1

(MIO)

Data/

Address/

Control

AI (x8)

INA

DIO (x16)

DIO (x32)

Overvoltage

Protection

Overvoltage

Protection

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

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.

NI USB 7856R User Manual | ni.com

2 |

Figure 2. NI USB-7856R Pinout

DIO30

GND

DIO28

GND

DIO26

GND

DIO24

GND

DIO22

GND

DIO20

GND

DIO18

GND

DIO16

GND

DIO14

GND

DIO12

GND

DIO10

GND

DIO8

GND

DIO6

GND

DIO4

GND

DIO2

GND

DIO0

GND

GND

GND

DIO31

DIO29

GND

GND

DIO25

GND

DIO23

GND

DIO27

GND

DIO21

GND

DIO19

GND

DIO17

GND

DIO15

GND

DIO13

GND

DIO11

GND

DIO9

GND

DIO7

GND

DIO5

GND

DIO3

GND

DIO1

GND

GND

GND

68 34

67 33

66 32

65 31

64 30

63 29

62 28

61 27

60 26

59 25

58 24

57 23

56 22

55 21

54 20

53 19

52 18

51 17

50 16

49 15

48 14

47 13

46 12

45 11

44 10

43 9

42 8

41 7

40 6

39 5

38 4

37 3

36 2

35 1

+5V

DIO0

DIO1

DIO2

DIO3

DIO4

DIO5

DIO6

DIO7

DIO9

DIO11

DIO13

DIO15

AO7

AO6

AO5

AO4

AO3

AO2

AO1

AO0

AISENSE

AI7+

AIGND6

AI6+

AI5+

AIGND4

AI4+

AI3+

AIGND2

AI2+

AI1+

AIGND0

AI0+

+5V

DGND

DGND

DGND

DGND

DGND

DGND

DGND

DGND

DIO8

DIO10

DIO12

DIO14

AOGND7

AOGND6

AOGND5

AOGND4

AOGND3

AOGND2

AOGND1

AOGND0

NC

AI7–

AIGND7

AI6–

AI5–

AIGND5

AI4–

AI3–

AIGND3

AI2–

AI1–

AIGND1

AI0–

68 34

67 33

66 32

65 31

64 30

63 29

62 28

61 27

60 26

59 25

58 24

57 23

56 22

55 21

54 20

53 19

52 18

51 17

50 16

49 15

48 14

47 13

46 12

45 11

44 10

43 9

42 8

41 7

40 6

39 5

38 4

37 3

36 2

35 1

CONNECTOR 0

(DIO)

CONNECTOR 1

(MIO)

TERMINAL 34

TERMINAL 68

TERMINAL 1

TERMINAL 35

TERMINAL 34

TERMINAL 68

TERMINAL 1

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

Connector

PGIA

ADC

AI+

NI USB-7856R

Connection

Accessory

AISENSE

AIGND

V

1

+

–

Overvoltage

Protection

AI–

Overvoltage

Protection

Overvoltage

Protection

Type

Table 1. Connection Accessories and Cables

Accessory Accessory

Description

Cable Cable

Description

MIO NI SCB-68A

(782536-01)

A 68-pin,

shielded I/O

connector

NI SHC68-68-RMIO

(189588-01, 1 meter) or

(189588-02, 2 meter)

A shielded,

68-conductor

cable

block

DIO NI SCB-68 HSDIO

(782914-01)

A 68-pin,

shielded

high-speed

digital

NI SHC68-C68-RDIO2
(156166-01, 1 meter) or

(156166-02, 2 meter)

A shielded,

digital I/O

68-conductor

cable

connector

block

Analog Input

The NI USB-7856R provides connections for eight AI channels. Each channel has an AI+ pin,
AI- pin, 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

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.

NI USB 7856R User Manual | ni.com

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