National Instruments NI USB-7855R Manual de usuario

National Instruments USB-7855 Manual

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USER MANUAL

NI USB-7855R

R Series for USB Multifunction RIO with Kintex-7 70T FPGA

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This document provides compliance, pinout, connectivity, mounting, and power information

for the National Instruments USB-7855R.

Safety Guidelines

Caution Do not operate the NI USB-7855R 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-7855R.

Figure 1. NI USB-7855R Block Diagram

Device

Temperature

Overvoltage

Protection

Overvoltage

Protection

FPGA

Temperature

40 MHz

OSC

AO (x8)

USB

NI ASICKintex-7

FPGA

NI USB-7855R

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

Connecting the NI USB-7855R

The NI USB-7855R 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-7855R User Manual | ni.com

Figure 2. NI USB-7855R 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

DIO31

DIO29

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

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

DIO8

DIO10

DIO12

DIO14

AOGND7

AOGND6

AOGND5

AOGND4

AOGND3

AOGND2

AOGND1

AOGND0

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-7855R User Manual | © National Instruments | 3

Table 1. Connection Accessories and Cables

Connector

Type

Accessory Accessory

Description

Cable Cable

Description

MIO NI SCB-68A

(782536-01)

A 68-pin,

shielded I/O

connector

block

NI SHC68-68-RMIO

(189588-01, 1 meter) or

(189588-02, 2 meter)

A shielded,

68-conductor

cable

DIO NI SCB-68 HSDIO

(782914-01)

A 68-pin,

shielded

high-speed

digital

connector

block

NI SHC68-C68-RDIO2

(156166-01, 1 meter) or

(156166-02, 2 meter)

A shielded,

digital I/O

68-conductor

cable

Analog Input

The NI USB-7855R 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-7855R, 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-7855R

PGIA ADC

AI+

NI USB-7855R

Connection

Accessory

AISENSE

AIGND

–

Overvoltage

Protection

AI– Overvoltage

Protection

Overvoltage

Protection

To connect non-referenced single-ended voltage signals to the NI USB-7855R, 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-7855R User Manual | ni.com

Figure 4. Connecting Non-Referenced Single-Ended Signals to the NI USB-7855R

PGIA ADC

AI+

NI USB-7855R

Connection

Accessory

AISENSE

AIGND

Vcm

–

Overvoltage

Protection

AI– Overvoltage

Protection

Overvoltage

Protection

Connecting Differential Voltage Signals

You can connect grounded or floating differential signal sources to the NI USB-7855R.

Connect the positive voltage signal to the AI+ and the negative voltage signal to AI-. To

connect grounded differential signals to the NI USB-7855R, you must also connect the signal

reference to AI GND.

Figure 5. Connecting Grounded Differential Signals to the NI USB-7855R

PGIA ADC

AI+

NI USB-7855R

Connection

Accessory

AISENSE

AIGND

Vcm

–

Overvoltage

Protection

AI– Overvoltage

Protection

Overvoltage

Protection

To connect floating differential signals to the NI USB-7855R, you must connect the negative

and positive signals to AI GND through 1 MΩ resistors to keep the voltage within the

common-mode voltage range. If the voltage source is outside the common-mode voltage

range, the NI USB-7855R does not read data accurately.

NI USB-7855R User Manual | © National Instruments | 5

Figure 6. Connecting Floating Differential Signals to the NI USB-7855R

PGIA ADC

AI+

NI USB-7855R

Connection

Accessory

AISENSE

AIGND

–

Overvoltage

Protection

AI– Overvoltage

Protection

Overvoltage

Protection

Analog Output

The NI USB-7855R provides connections for eight analog output channels. Each channel has

an AO pin and AOGND pin to which you can connect a load.

Figure 7. Connecting a Load

NI USB-7855R

Connection

Accessory

AOGND

LOAD

DAC

Digital I/O

The NI USB-7855R provides connections for 48 digital input/output (DIO) channels.

Connector 0 contains 32 high-speed DIO channels that can run up to 80 MHz signal

frequencies and Connector 1 contains 16 low-speed channels that can run up to 10 MHz signal

frequencies. Each connector has selectable logic levels that you can configure as 1.2 V, 1.5 V,

1.8 V, 2.5 V, or 3.3 V. You can configure each channel as input or output.

6 | NI USB-7855R User Manual | ni.com

Figure 8. Connecting to the DIO Channels

NI USB-7855R

Power

FPGA

Connection

Accessory

DIO0

DIO1

DIO30

DIO31

Connecter 0 (DIO)

Connection

Accessory

DIO0

DIO1

DIO14

DIO15

Connecter 1 (MIO)

1. High-speed signal frequencies up to 80 MHz with logic levels configured as 1.2 V, 1.5 V, 1.8 V, 2.5 V, or

3.3 V.

2. Low-speed signal frequencies up to 10 MHz with logic levels configured as 1.2 V, 1.5 V, 1.8 V, 2.5 V, or

3.3 V.

3. LED

The DIO channels connect to the FPGA through buffers, which have overvoltage and

undervoltage protection as well as over current protection. Refer to the NI USB-7855R

Specifications for more information about the maximum voltage and current.

When the system powers on, the DIO channels are set as input low with pull-down resistors.

To set another power-on state, you can configure the NI USB-7855R to load a VI when the

system powers on. The VI can then set the DIO lines to any power-on state.

All the high-speed DIO channels on Connector 0 are routed with a 50 Ω characteristic trace

impedance. Route all external circuitry with a similar impedance to ensure best signal quality.

NI recommends performing signal integrity measurements to test the affect of signal routing

with the cable and connection accessory for your application.

Field Wiring Considerations

Environmental noise can seriously affect the measurement accuracy of the device if you do not

take proper care when running signal wire between signal sources and the device. The

following recommendations mainly apply to AI signal routing to the device, as well as signal

routing in general.

Take the following precautions to minimize noise pickup and maximize measurement

accuracy:

• Use differential AI connections to reject common-mode noise.

• Use individually shielded, twisted-pair wires to connect AI signals to the device. With

this type of wire, the signal attached to the positive and negative inputs are twisted

together and then covered with a shield. You then connect this shield only at one point to

the signal source ground. This kind of connection is required for signals traveling through

areas with large magnetic fields or high electromagnetic interference.

• Route signals to the device carefully. Keep cabling away from noise sources, such as

video monitors and analog signals.

Use the following recommendations for all signal connections to the NI USB-7855R:

• Separate NI USB-7855R signal lines from high-current or high-voltage lines. These lines

can induce currents in or voltages on the NI USB-7855R signal lines if they run in

parallel paths at a close distance. To reduce the magnetic coupling between lines, separate

them by a reasonable distance if they run in parallel or run the lines at right angles to each

other.

• Do not run signal lines through conduits that also contain power lines.

• Protect signal lines from magnetic fields caused by electric motors, welding equipment,

breakers, or transformers by running them through special metal conduits.

Mounting R Series USB Devices

You can use your R Series USB device on a desktop, mount it on a wall, or mount it on a DIN

rail.

Panel or Wall Mounting

Complete the following steps to panel or wall mount your NI USB-7855R. You can purchase

the panel mounting kit at ni.com with part number 781514-01.

1. Use three #8-32 flathead screw to attach the backpanel wall mount to the panel or wall.

Tighten the screw with a #2 Phillips screwdrivers to a torque of 1.1 N · m (10 lb · in.).

2. Place the NI USB-7855R on the backpanel wall mount with the signal wires facing down

and the device bottom sitting on the backpanel wall mount lip.

3. While holding the NI USB-7855R in place, attach the front bracket to the backpanel wall

mount by tightening the two thumbscrews.

8 | NI USB-7855R User Manual | ni.com

Figure 9. Wall or Panel Mounting the NI USB-7855R

DIN Rail Mounting

Complete the following steps to mount your NI USB-7855R. You can purchase a DIN rail

mounting clip at ni.com with part number 781515-01.

1. Fasten the DIN rail clip to the back of the backpanel wall mount using a #1 Phillips

screwdriver and four machine screws. Tighten the screws to a torque of 0.4 N · m (3.6 lb

· in.).

2. Clip the bracket onto the DIN rail as shown.

Figure 10. DIN Rail Clip Parts Locator Diagram

1. DIN Rail Clip

2. DIN Rail Spring

3. DIN Rail

3. Place the NI USB-7855R on the backpanel wall mount with the signal wires facing down

and the device bottom sitting on the backpanel wall mount lip.

4. While holding the NI USB-7855R in place, attach the front bracket to the backpanel wall

mount by tightening the two thumbscrews.

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