NI USB-7856R OEM R Series User Manual - Hardware and I/O Connections

Oct 22, 2026

NI USB-7856R OEM R Series user manual提供器件尺寸、连接信息与接口引脚定义，涵盖设备硬件概览与主要连接器分布。文中说明该设备支持8路模拟输入(AI)、8路模拟输出(AO)以及48路数字I/O(DIO)，并给出各连接器对应的描述与参考器件信息。内容还包含单端与差分电压信号的接法要点，强调共模电压范围、接地/参考连接方式及损坏时的处理注意事项。

LanguageEnglish

CategoryTechnology

FormatPDF

Pages16

Reading Time40 min

AccessFree to download

Hardware Overview

Device components

Device connectors

Dimensions

Connecting the NI USB-7856R OEM device

Analog input channels and pins

Connecting single-ended voltage signals

Connecting differential voltage signals

USER MANUAL NI USB-7856R OEM R Series for USB Multifunction RIO with Kintex-7 160T FPGA | Français Deutsch 日本語 한국어 简体中文 | | --- | | [ni.com/manuals](ni.com/manuals) | This document provides dimensions, connectivity information, and pinouts for the National Instruments USB-7856R OEM device. Caution National Instruments makes no product safety, electromagnetic compatibility (EMC), or CE marking compliance claims for NI USB-7856R OEM device. The end-product supplier is responsible for conformity to any and all compliance requirements. Caution Do not operate the NI USB-7856R OEM device 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. Hardware Overview The following high-level block diagram represents the NI USB-7856R OEM device. CONNECTOR 0 CONNECTOR 1 CONNECTOR 2 CONNECTOR 3 |

| | |
| | --- | --- | --- | --- | | | | DIO
AI Kintex-7 FPGA
FPGA
Temperature
AO | | | | | | | | | | | NI USB-7856R OEM | [2 |](2 | NI USB-7856R OEM User Manual | ni.com)[ NI USB-7856R OEM User Manual](2 | NI USB-7856R OEM User Manual | ni.com)[ | ni.com](2 | NI USB-7856R OEM User Manual | ni.com) 3 7 8 6 | 1. | USB Connector | 5. | Connector 0 (Analog) | | --- | --- | --- | --- | | 2. | Power Supply Connector | 6. | Connector 1 (Digital) | | 3. | Power Switch | 7. | Connector 2 (Digital) | | 4. | External LED Attachments | 8. | Connector 3 (Digital) | | NI USB-7856R OEM Device Components | | | | The following table lists the interfacing components on the NI USB-7856R OEM device and the component manufacturers. Table 1. NI USB-7856R OEM Device Components | Components | Reference Designator | Manufacturer | | --- | --- | --- | | LEDs | DS2, DS5, DS7, DS8, DS10 | SunLED (XZBB54W-1TN) | | | DS4 | Everlight Electronic (QTLP630C-2 T/R) | | USB connector | J5 | Tyco (292304-1) | | Power connector | J1, J2, & J9 | Phoenix Contact (1727566) | | Power switch | SW2 | C&K (E101J1AQE2) | The following table lists and describes the I/O connectors on the NI USB-7856R OEM device. Refer to the connector manufacturer for information about using and matching these connectors. NI USB-7856R OEM User Manual | © National Instruments | 3 Table 2. NI USB-7856R OEM Device Connectors | Connector | Description | Reference Designator | Manufacturer | | --- | --- | --- | --- | | AI, AO | 50-position header | P2 | 3M (N2550-6002RB) | | DIO | 34-position header | J9 | 3M (N2534-6002RB) | | External LED | 7-position header | E1 | FCI 68000-107LF | [4 |](4 | NI USB-7856R OEM User Manual | ni.com)[ NI USB-7856R OEM User Manual](4 | NI USB-7856R OEM User Manual | ni.com)[ | ni.com](4 | NI USB-7856R OEM User Manual | ni.com) Dimensions 0.285 (7.24) 2.055 (52. 19) 3.797 (96.44) 2X 5.838 ( 148.29) 2X 6.675 (169 .55) 2X 6.435 (163 .46) 6.263 (159 .08) 2X 6.055 (153 .81) 2X 2.863 (72 .72) 2X .175 (4 .45) .000 (0) .119 (3 .02) .000 (0) 3X .285 (7.24) 3X 6.1 15 ( 155.32) 6.400 ( 162.56) NI USB-7856R OEM User Manual | © National Instruments | 5 Note [Visit](Visit ni.com/dimensions)[ ni.com/dimensions](Visit ni.com/dimensions) for more information about the dimensions of the NI USB-7856R OEM device, including two-dimensional drawings and threedimensional models. Note The NI USB-7856R OEM device has plated mounting holes that can act as chassis ground. Connecting the NI USB-7856R OEM Device The NI USB-7856R OEM device 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. [6 |](6 | NI USB-7856R OEM User Manual | ni.com)[ NI USB-7856R OEM User Manual](6 | NI USB-7856R OEM User Manual | ni.com)[ | ni.com](6 | NI USB-7856R OEM User Manual | ni.com) 3.812 (96

FAQs

NI USB-7856R OEM 支持哪些通道与I/O类型？

该设备提供8路模拟输入(AI)、8路模拟输出(AO)以及48路数字输入/输出(DIO)。连接方式在文中以连接器与图示进行说明。

连接参考单端电压信号时需要注意什么？

需要将电压地信号连接到AI GND，以确保共模电压保持在规定范围内。

浮地差分信号如何连接以保证正确读取？

将正负信号分别通过1 MΩ电阻连接到AI GND，以维持在共模电压范围内；若超出范围，设备可能无法准确读取数据。

Oct 22, 2026

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