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National Instruments NI USB-7855R, Руководство пользователя

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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 ASIC

Kintex-7

FPGA

NI USB-7855R

Flash

Memory

DIO

+5 V

Reference

DAC

AO

ADC

AI

CONNECT

OR 0

(DIO)

CONNECT

OR 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.

2 | NI USB-7855R User Manual | ni.com

Содержание NI USB-7855R

Страница 1: ...onal Instruments USB 7855 Manual Get Pricing Availability at ApexWaves com Call Today 1 800 915 6216 Email sales apexwaves com https www apexwaves com modular systems national instruments r series USB 7855 ...

Страница 2: ...lity 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...

Страница 3: ...ide 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 ASIC Kintex 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 P...

Страница 4: ... 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 5...

Страница 5: ...ded 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 Sign...

Страница 6: ...tial 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 V1 Overvoltage Protection AI Overvoltage Protection Overvoltage Protection To connect floating differential signals to the NI USB 7855R you must connect the negative and positive s...

Страница 7: ...nect a load Figure 7 Connecting a Load NI USB 7855R Connection Accessory AOGND LOAD AO 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 log...

Страница 8: ...t 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 p...

Страница 9: ...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 Mounti...

Страница 10: ...ws 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 2 3 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 ...

Страница 11: ...criptions Symbol LED Description POWER Solid blue when the power is on USB READY Solid blue when the USB is ready ERROR Solid red for error cases 1 USER USER1 Blue user defined 2 USER USER2 Blue user defined 3 USER USER3 Blue user defined The following figure shows the LEDs on the front panel of the NI USB 7855R 10 NI USB 7855R User Manual ni com ...

Страница 12: ...Instruments is not liable for damage resulting from such a connection The power rating is 4 75 to 5 1 VDC at 0 5 A Autonomous Mode You can run the NI USB 7855R without a USB connection to a host computer using Autonomous Mode To collect data the NI USB 7855R acquires in Autonomous Mode you must reconnect the NI USB 7855R to a host computer Caution Data is lost and is not recoverable upon reconnect...

Страница 13: ...elp resources to email and phone assistance from NI Application Engineers National Instruments corporate headquarters is located at 11500 North Mopac Expressway Austin Texas 78759 3504 National Instruments also has offices located around the world to help address your support needs For telephone support in the United States create your service request at ni com support and follow the calling instr...

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