Usb device classes wikipedia. The device will appear under Other devices as the SiM3U1xx CDC Class device. Jul 28, 2023 · The Audio Device Class Definition applies to all Devices or Functions embedded in composite Devices that are used to manipulate audio, voice, and sound-related functionality. The Android Debug Bridge (commonly abbreviated as adb) is a programming tool used for the debugging of Android -based devices. It is mostly used on personal computers. PCI or PCIe ). USB-A is still widely used and can be found on devices The primary and underlying goals of the HID class definition are to: be as compact as possible to save device data space. The PID Class is intended as an extension of the Human Interface Device (HID) Class for devices that require “real-time” physical feedback. [3] Dec 7, 2011 · The USB Audio/Video (AV) Device Class Definition describes the methods used to communicate with devices or functions embedded in composite devices that are used to manipulate audio, video, voice, and all image- and sound-related functionality. The older serial RS-423 protocol is rarely used USB-C, được gọi chính thức là USB Type-C, là một hệ thống đầu nối USB 24 chân, được phân biệt bởi đầu nối đối xứng xoay hai lần. The Multilingual Control supports only the CUR Control attribute. x phiên bản thứ ba của chuẩn Universal Serial Bus (USB) cho phép máy tính và các thiết bị điện tử giao tiếp với nhau. USB decoration. 最新的UVC版本為UVC 1. [2] Thông số kỹ thuật USB Type-C 1. USB FlashCard. hid1_11. The Logitech Unifying Receiver is a small dedicated USB wireless receiver, based on the nRF24L-family of RF devices, [1] that allows up to six compatible Logitech human interface devices (such as mice, trackballs, touchpads, and keyboards; headphones are not compatible) to be linked to the same computer using 2. USB protocols can configure devices at startup or when they are plugged in at run time. To a host, the USB device acts as an USB communications device class is a set of standards for USB devices that can exchange data with other devices or computers over a network. The Introduction to USB with STM32 article is a dedicated wiki page that provides a general overview of the Universal Serial Bus and its main features. Learn more about the features, specifications, and applications of this device class on Wikipedia. android . These files’ APIs will be called within USB device applications according to the desired functionality. With the UVC standard the host receives structures to describe video device Oct 7, 2022 · With the introduction of USB 3. 1. The Universal Serial Bus ( USB) is technology that allows a person to connect an electronic device to a computer. 1 Background Mar 3, 2023 · Universal Serial Bus. USB4 by itself does not provide any generic data transfer mechanism or device classes like USB 3. -s [[ bus ] : ][ devnum ] Show only devices in specified bus and/or devnum . Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). The software in a USB-based portable storage device that, when plugged into a computer, exposes the device's contents in the same manner as a built-in hard drive. 0 devices was published in 1999. Footer menu. It is designed to cover the widest range of possible MIDI applications and products. Dec 12, 2012 · I believe that today's standard is to communicate through USB using HID. The updated specification uses the new Universal MIDI Packet format over USB, and is designed to cover the widest USB communications. Like ThreadX, Azure RTOS USBX is designed to have a small footprint and high performance, making it ideal for deeply embedded applications Nov 10, 2023 · Informs the host of what version of USB the device supports: bDeviceClass: 00 - The device class is defined in the Interface Descriptor FF - the device class is Vendor class any other number is the specification for the class of this device: idVendor: 16-bit number assigned by USB. 0 and includes the adopters agreement for developers and manufacturers. 31 KB. Webcams [edit] Universal Serial Bus 3. Universal Audio Architecture (UAA) is an initiative unveiled in 2002 by Microsoft to standardize the hardware and class driver architecture for audio devices in modern Microsoft Windows operating systems. (USB-HID = USB Human Interface Device) Modern game controllers and joysticks are often USB HID class devices. 最新的UVC版本为UVC 1. 네이버캐스트에서 Language links are at the top of the page across from the title. 2, DisplayPort, and optionally PCIe. 이 표준을 지원하는 장치들을 대용량 저장소 Device Detection; Register Access; Streaming Data; Event Handling; The standard defines a specific USB Class ID (Class 0xEF, Subclass 0x05) for identifying the device. USB mass storage device class is a set of computing protocols defined by The USB Implementers Forum that run on the Universal Serial Bus. 2; USB Charger (USB PD) USB Type-C® Authentication; Compliance USB4® USB 3. USB video class （又称为 USB video device class or UVC ）就是 USB device class影像产品在不需要安装任何的驱动程式下随插即用，包括 网路摄影机 、数位 摄影机 、类比影像转换器、 电视卡 （英语：TV tuner card） 及 静态影像相机 。. /// <summary>. This includes both AV data (analog and digital) and associated metadata and the functionality that is Feb 19, 2010 · About USB-IF Members; Developers Request a Vendor ID; Defined Class Codes; Human Interface Devices (HID) BOS Descriptor Types; Technologies. , a small lamp on a gooseneck stalk) use the USB connector itself for mechanical support. 1. 2 HID (Human Interface Device) Acronym specifying either a specific class of devices or the type of device known as Human Interface Devices (HID) or HID class devices—for example, a data glove. CCID ( chip card interface device) protocol is a USB protocol that allows a smartcard to be connected to a computer via a card reader using a standard USB interface, without the need for each manufacturer of smartcards to provide its own reader or protocol. About USB-IF. Human interface device. Three classes of audio devices are supported by default: USB, IEEE 1394 ( FireWire ), and Intel High Definition Audio, which supports PCI and The USB video device class (also USB video class or UVC) is a USB device class that describes devices capable of streaming video like webcams, digital camcorders, analog video converters, and still-image cameras. The USB-IF was formed to provide a support organization and forum for the advancement and adoption of Universal Serial Bus technology. 0 Billboard Device Class is defined to communicate the details of supported Alternate Modes to the computer host OS. Webcams Jan 17, 2024 · Microsoft provides in-box drivers for several of those device classes, called USB device class drivers. be extensible and robust. The purpose of printer drivers is to allow applications to do printing without being Website. The USB devices that you connect to your computer are typically grouped into a number of device classes—such as keyboards, mice, video devices, and so on. Make sure the driver is seen by windows under Device Manager: C# Code: using NationalInstruments. 0 OTG controller communication device class functionality when Linux is running on the target board and windows PC as a host. Nearly all game devices will function using onboard drivers as long as the device is designed around the drivers and the USB HID class specifications. How devices on the USB bus behave is the subject of this and other USB Device Class คอนเนคเตอร์ USB แบบ A. This document must be considered an integral part of the USB Audio Device Class Definition. The “STM32_USB_Device_Library” includes the “Core” module for the USB device standard peripheral control APIs and “Classes” model for the commonly supported classes APIs. Use of USB OTG allows devices to switch back and forth between the Browse Encyclopedia. Toggle Devices subsection. USB over Ethernet (also called USB over Network or USB over IP) is a system to share USB-based devices over Ethernet, Wi-Fi, or the Internet, allowing access to devices over a network. Figure 1: USBVIEW Screenshot. In particular, see Chapter 5, “USB Data Flow Model” and Chapter 9, “USB Device Framework. August 1999. com /studio /command-line /adb. 0, and a growing number are updating to USB 3. 6 IN NO EVENT SHALL USB-IF OR THE USB 3. A CDC device can appear as a virtual serial port to simplify the use of a new device for older applications. A human interface device or HID is a type of computer device usually used by humans that takes input from or provides output to humans. com. Obvykle se jedná o tato zařízení: externí pevné disky. [ 3] Jun 12, 2012 · About USB-IF Members; Developers Request a Vendor ID; Defined Class Codes; Human Interface Devices (HID) BOS Descriptor Types; Technologies. x, but serves mostly as a way to tunnel other protocols like USB 3. 1 Human Interface Devices (HID) Class WebUSB is a JavaScript application programming interface (API) specification [1] for securely providing access to USB devices from web applications. pdf 1. 0 Nov 1, 1999 8 1 Introduction Following is the USB Audio Device Class Definition for MIDI Devices. Category Legal Presentations Specification Tools White Paper. [1] Whereas PTP was designed for downloading photographs from digital cameras, Media Transfer Protocol allows the transfer of music files on Sep 16, 2008 · Once you created the driver you will be able to Write and Read bytes to any USB Device. wikipedia. [1] a variety of devices via a simple four-wire cable. In some classes, it requires the FileX and NetX Duo stacks. The communication industry did not develop as the USB-IF foresaw, but the various transfer modes that USB introduced allowed it to become one of Set the utility to display “Config Descriptors” under the options tab and then select the required device from the device tree. 2 TV receivers and video recorders. "GRAPHICS" redirects here. 0 ( USB 3. Ổ USB flash (ổ cứng di động USB, ổ cứng gắn nhanh cổng USB), thường được gọi là USB [1] [2] [3] (đọc là "u ét bê"), là thiết bị lưu trữ dữ liệu sử dụng bộ nhớ flash (một dạng IC nhớ hỗ trợ cắm nóng, tháo lắp nhanh) tích hợp với giao tiếp USB ( U USB 3. UVC is an evolution of Plug and Play technology, where the initial detection and configuration of a device is performed by the operating system without any user interaction. [1] This allows the smartcard to be used as a security token for authentication and data USB Type-C，又稱USB-C，是一種通用序列匯流排（USB）的硬體介面形式，外觀上最大特點在於其上下端完全一致，與USB Type-A相比不再區分USB正反面。 USB-C規範1. Class descriptors will be shown, when available, for USB device classes including hub, audio, HID, communications, and chipcard. 2; USB 2. The USB mass storage device class (also known as USB MSC or UMS) is a set of computing communications protocols, specifically a USB Device Class, defined by the USB Implementers Forum that makes a USB device accessible to a host computing device and enables file transfers between the host and the USB device. While it does provide a native Host-to-Host protocol, as the name implies it is only available between two connected hosts; it is used to One solution is the use of a predefined USB device class. Website. It was at this time that the USB-IF decided to lump all 3. The guide below shows you how to build USB drivers & boot the board and then run some example configurations (Host, Device, OTG mode of PS USB controller ) on Versal platform. A USB-to-serial adapter or simply USB adapter is a type of protocol converter that is used for converting USB data signals to and from serial communications standards ( serial ports ). www . It is a fast serial bus type. This wikipedia article reveals that CDC/ACM is a method of emulating RS-232 communication over USB. USB is also used on other devices, such as smartphones and video game consoles. [8] Punched tape was later used in Colossus, the first Oct 16, 2023 · The Universal Serial Bus ( USB) is technology that allows a person to connect an electronic device to a computer. 1 devices can reach a maximum transmission rate of 12 Mbps, called Full Speed USB. The most widely used device class for embedded devices is the USB communications device class (CDC). This document defines the audio device class for USB 1. USB human interface device class. 0 March 18, 199820. 0 Billboard Device Class Specification USB 2. 6 Game consoles and embedded devices. The classes of KVM switches discussed below are based on different types of core technologies, which vary in how the KVM switch handles USB I/O devices—including keyboards, mice, touchscreen displays, etc. 3 languages Mar 15, 2024 · 흔히 "삼지창"이라 불리는 USB 심벌은 중의적으로, 서로 다른 주변기기들 (우측의 원, 삼각, 사각)을 모두 호스트 (좌측의 큰 원)에 연결할 수 있음을 나타내기도 하고, USB의 세 구성요소인 5볼트 전력 공급, 직렬 데이터, 접지를 나타내기도 한다. ”. A USB Type A plug. The Forum facilitates the development of high USB Mass Storage (označována zkratkou UMS) je počítačový komunikační protokol používaný ke komunikaci s externími zařízeními pomocí USB . This Document describes the USB Physical Interface Device or PID Class. 4 GHz band radio communication. Hardware vendors shouldn't write drivers for the supported USB keyboards, mice, and I/O devices are the most common devices connected to a KVM switch. Most commonly the USB data signals are converted to either RS-232, RS-485, RS-422, or TTL-level UART serial data. A four-port "compact design" USB hub: upstream and downstream ports shown. The main focus for the definition is for the use of haptic devices and the implementation of force feedback systems. USB dead drop. 0 and every class’s specifications. 2 in 2017, we saw yet another 10 GBps tier and a faster 20 Gbps tier, both with dual-lane capabilities. It is unrelated to Wi-Fi and different from the Cypress Wireless USB offerings. The Certified Wireless USB logo. As of July 2021, it is in Draft Community status, and is supported [3] by Google Chrome, Microsoft Edge, QQ, Opera, and Samsung USB视频类别. 4 Design. Can be used with the -t option. This is highlighted at the top of the screenshot in figure 1. Universal Serial Bus (abreviado como USB, em português, porta serial universal) é um padrão da indústria que estabelece especificações para cabos, conectores e protocolos para conexão, comunicação e alimentação ( interface) entre computadores, periféricos e outros computadores. allow the software application to skip unknown information. Another solution A USB-powered decorative Christmas tree. Many of these are also web accessible via the WebHID API. org to the product's manufacturer: idProduct Apr 25, 2023 · Building Linux usb device drivers with 2021. Unlike legacy game port devices, USB HID class game devices do not normally require proprietary drivers to function. 3 Device access. This includes both audio data (analog and digital) and the functionality that is used to directly manipulate audio signals, such as Gain and Tone Control. The information is contained in three bytes with the names Base Class, SubClass, and Protocol. A video sample is made up of one or more payload transfers (as defined in the USB Device Class Specification for Video Devices). The daemon on the Android device connects with the server on the host PC over USB or TCP, which connects to the client that is used by the end-user over TCP. It is developed by ISO/IEC JTC 1 (Joint The earliest form of removable media, punched cards and tapes, predates the electronic computer by centuries, with the Jacquard loom of 1801 using interlinked cards to control the machine. 2 Formats. developer . is a non-profit corporation founded by the group of companies that developed the Universal Serial Bus specification. USB communications device class (or USB CDC) is a composite Universal Serial Bus device class. A USB hub is a device that expands a single Universal Serial Bus (USB) port into several so that there are more ports available to connect devices to a host system, similar to a power strip. The operating system can then know what the devices is designed to do and automatically load what is called a class compliant driver for that type of devices. SanDisk 1 TB USB-C flash drive (2020 model) next to a 50 cent euro coin. It includes modems, network adapters, and wireless devices. Each MJPEG frame is considered a single video sample. It provides user readable strings with product description and user support information. 0 có tốc độ đường truyền mới gọi là SuperSpeed USB (SS), với tốc độ chuyển dữ liệu lên đến 5 Gbit/s (625 MB/s ), gấp khoảng mười lần so Jun 1, 2005 · 3. Jan 7, 2022 · Device Class Specification. Right-click on the SiM3U1xx CDC Class device and select Update Driver Software. Redirect page. In computers, a printer driver or a print processor is a piece of software on a computer that converts the data to be printed to a format that a printer can understand. Printer driver. The USB 3. A USB communications device class (CDC) is another possible device class that was considered for this application. From Wikipedia, the free encyclopedia. In this document, “HID class” is synonymous with a device of type: human interface. . [2] It was published by the Web Platform Incubator Community Group. Jul 14, 2020 · The original USB Device Class Specification supporting MIDI 1. Nov 9, 2023 · USB defines class code information that is used to identify a device’s functionality and to nominally load a device driver based on that functionality. Each interface has a device ID of the following form: USB\VID_v (4)&PID_d (4)&MI_z (2) Where: v (4) is the vendor code that the USB committee assigns to the vendor. 2 Video Samples. 2 USB Device Classes. USB-A, or USB Type A, is the original flat and rectangular connector that no one could ever figure out how to plug in correctly the first time. (Note that Base Class is used in this description to identify the first byte of the Class Code Ethernet over USB is the use of a USB link as a part of an Ethernet network, resulting in an Ethernet connection over USB (instead of e. USB Implementers Forum, Inc. 0 (referred to in this document as the USB Specification). 0 PROMOTERS BE LIABLE FOR ANY ACTUAL, DIRECT, INDIRECT, PUNITIVE, OR CONSEQUENTIAL DAMAGES ARISING FROM SUCH USE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. USB video device class. These cables always have USB-A on one end with a different port type on the other, and can be used for device charging and data transfer. PIL Lab; USB-IF eStore Dec 10, 2023 · USB is the de-facto standard for wired peripherals. Since then, USB MIDI has grown significantly and is now the most widely used transport for MIDI. 이 표준은 다양한 저장매체에 대한 인터페이스를 제공한다. 5. USB Killer. 1 Related Documents. For an isochronous pipe, each (micro) frame will contain a single payload transfer. A flash drive (also thumb drive [US], memory stick [UK], and pen drive / pendrive elsewhere) [1] [note 1] is a data storage device that includes flash memory with an integrated USB interface. The Media Transfer Protocol ( MTP) is an extension to the Picture Transfer Protocol (PTP) communications protocol that allows media files to be transferred automatically to and from portable devices. USBX is the Azure ® RTOS USB Host and USB Device embedded stack. 2. x Oct 14, 2020 · Follow the below procedure to test the Zynq-7000 AP SoC USB 2. ISO/IEC 7816 is an international standard related to electronic identification cards with contacts, especially smart cards, and more recently, contactless mobile devices, managed jointly by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) . For other uses, see graphics (disambiguation). The term "HID" most commonly refers to the USB HID specification. 0 được xuất bản bởi USB Implementers Forum (USB-IF) và được hoàn thiện vào tháng 8 năm 2014. 0; USB Type-C; Cables and Connectors; Compliance Tools; Test Labs. Open Device Manager. 3 Revision history. 5 milliwatts, giving it a very short range of up to 10 metres 1 Devices. A google search for ACM reveals that it is part of CDC (Communications Device Class) which is a USB communication class opposite of HID (i. Most USB devices and cables today work with USB 2. USB視頻類別. May 31, 2006 · 1. USB-based 5. These are supported using the operating system's class driver. The communications device class is used for computer networking devices akin to a network card , providing an interface for transmitting Ethernet or ATM frames onto some physical media. The valid range is from zero (0x00) to seven (0x07). The Universal Serial Bus was first introduced in 1994 with the intention of replacing various specialized interfaces, and to simplify the configuration of communication devices. Connect the USB cable between the Device USB connector (J13) and the PC. Secure Digital, officially abbreviated as SD, is a proprietary, non-volatile, flash memory card format the SD Association (SDA) developed for use in portable devices. USB 3. USB connects different devices using a standard interface. PIL Lab; USB-IF eStore Apr 21, 2023 · USB 1. USB Device Class Definition for MIDI Devices Release 1. Devices which support this standard are referred to as MSC (mass storage class) devices. 1 Webcams. The steps below use PetaLinux and assume you have some knowledge of using PetaLinux. About USB-IF Members; Compliance USB4® USB 3. a USB device may use HID or CDC). Generic drivers which support USB flash drives even in Windows 98 are available as free downloads. 5 See also. pdf 1007. See full list on en. Universal Serial Bus ( USB - ยูเอสบี) เป็นข้อกำหนดมาตรฐานของ บัส การสื่อสารแบบ อนุกรม เพื่อใช้ใน การเชื่อมต่อ กับอุปกรณ์ Một ổ USB flash. The following figure shows the folders structure of the STM32 USB device library. A USB decoration is a decorative device that uses the Universal Serial Bus (USB) connector for electrical power, and sometimes the protocol, on a computer or other host. Open the software pack folder and import the Core folder into the created ‘USB’ folder. 0 allows the USB host to perform large bulk transfers with the USB device after the enumeration. The parts of a USB-connected system, including the host (like a computer), the cable, and the device, can all support different USB standards so long Nov 10, 2022 · The Generic Parent driver then creates a separate PDO and generates a separate set of hardware identifiers for each interface of the composite device. Universal Serial Bus Device Class Definition for Audio Devices (referred to in this document as USB Audio Device Class). be self-describing to allow generic software applications. Copy the files listed in the SD card images section on to the SD-MMC card. org The USB video device class (also USB video class or UVC) is a USB device class that describes devices capable of streaming video like webcams, digital camcorders, transcoders, analog video converters and still-image cameras . Protokol slouží ke standardizaci komunikace se zařízeními sloužícími k ukládání dat mimo počítač. The STM32 USB device library is part of the “Middlewares/ST” offer. 0 ), marketed as SuperSpeed USB, is the third major version of the Universal Serial Bus (USB) standard for interfacing computers and electronic devices. 3. A typical USB drive is removable, rewritable, and smaller than an optical disc USB On-The-Go ( USB OTG or just OTG) is a specification first used in late 2001 that allows USB devices, such as tablets or smartphones, to also act as a host, allowing other USB devices, such as USB flash drives, digital cameras, mouse or keyboards, to be attached to them. The term was coined by Mike Van Flandern of Microsoft when he proposed that the USB committee create a Human Input USB Device Firmware Upgrade (DFU) is an official USB device class specification of the USB Implementers Forum. The USB is actually a two-wire serial communication link that runs at 1. USB flash drive security. ‘00’ in the bmMPEGCapabilitiesfield of the MPEG format-specific descriptor), the control pipe must indicate a stall. All devices connected through a USB hub share the bandwidth available to that hub. bluetooth . /// Class to communicate with USB Devices using the UsbRaw Class of National Instruments. USB video class （又稱為 USB video device class or UVC ）就是 USB device class影像產品在不需要安裝任何的驅動程式下隨插即用，包括 網路攝影機 、數位 攝影機 、類比影像轉換器、 電視卡 （英語：TV tuner card） 及 靜態影像相機 。. USB4® USB 3. Mar 8, 2024 · Azure RTOS USBX is a high-performance USB host, device, and on-the-go (OTG) embedded stack. Put the SD Card in the SD card slot of the ZC702 board. The standard was introduced in August 1999 by SanDisk, Panasonic (Matsushita) and Toshiba as an improvement on MultiMediaCards (MMCs). USB microscope. Operating systems provide built-in drivers for some of them. Nov 24, 2009 · Learn about the specifications and requirements for basic audio devices that use the USB interface, such as speakers, microphones, and headsets. The key information to look for first is: bDeviceClass bDeviceSubClass bDeviceProtocol. Billboard messages can be used to identify incompatible connections made by users. 31 MB. Universal Serial Bus Specification, Revision 2. It is a fast serial bus. e. g. USB flash disky. It specifies a vendor and device independent way of updating the firmware of a USB device. This page holds a list of known UVC-compatible devices, arranged by category. All STM32 USB classes are implemented according to the USB 2. 0. In addition, some lightweight devices (e. UVC (USB Video device Class) is a class of devices that transmit in-stream video over USB. The idea is to have only one vendor-independent firmware update tool as part of the operating system, which can then (given a particular 2. In the most widely used mode, transmission power is limited to 2. 0 specification defined a new architecture and protocol, named SuperSpeed, which included a new lane for a new A vendor specific device class for USB 3. As the standard is defined at a protocol layer, the software vendor providing the driver may be a different entity than the company designing the camera. USB Device Class Definition for Audio Data Formats Release 1. USB I3C Device Class Revision 1. Azure RTOS USBX is fully integrated with Azure RTOS ThreadX and available for all ThreadX–supported processors. USB hardware. 5, 12, or 480 megabits (Mbs) per second. References are included. USB devices are defined into specific functional classes, for example image, human interface devices (keyboard, mouse, joystick), mass storage, and audio. support nesting and collections. Now, create another folder called ‘Class’ and import the desired classes to your project, in this case, the CDC is the only one selected. 5，由 Oct 26, 2023 · Download the USB Device package from the GitHub (the same link presented in the introduction of this article). This folder includes the files including different USB device classes. [7] This followed a loom made by Basile Bouchon in 1725 that used paper tape for its instructions. It was released in November 2008. Redirect to: USB#Device classes The USB video device class (also USB video class or UVC) is a USB device class that describes devices capable of streaming video like webcams, digital camcorders, analog video converters, and still-image cameras. Type Cable and Connector Specification Device Class Specification Test Matrix USB 대용량 저장소 장치 유형 (USB mass-storage device class, USB MSC)은 USB 에 관련된 USB 인플리멘터스 포럼 (Implementers Forum)이 규정한 컴퓨팅 통신 프로토콜 이다. If a device that belongs to a supported device class is connected to a system, Windows automatically loads the class driver, and the device functions with no other driver required. 5，由 Language links are at the top of the page across from the title. 0由 USB開發者論壇 （ USB-IF ）發布，並於2014年8月完成 [1] 。 Build the project and download firmware to the SiM3U1xx MCU card. Wireless USB ( Universal Serial Bus) is a short-range, high-bandwidth wireless radio communication protocol created by the Wireless USB Promoter Group, which is intended to increase the availability of general USB-based technologies. Mar 4, 2022 · USB-A. 1: USB 1. usb不支持環形網絡，因此不兼容的usb設備之間接口也不兼容。不像其他通訊系統（如rj-45電纜）不能使用轉換插頭，防止環形usb網絡產生。 適度的插拔力。usb電纜和小型usb設備能被插口卡住（不需要夾子、螺絲或者其他接口那樣的鎖扣）。 一個USB主機通過Hub鏈可以連接多個設備。由於理論上一個物理設備可以承担多種功能，例如路由器同時也可以是一個SD卡讀卡器，USB的術語中設備（Device）指的是功能（Functions）。集線器（Hub）由於作用特殊，按照正式的觀點並不認為是Function。 usb不支持环形网络，因此不兼容的usb设备之间接口也不兼容。不像其他通讯系统（如rj-45电缆）不能使用转换插头，防止环形usb网络产生。 适度的插拔力。usb电缆和小型usb设备能被插口卡住（不需要夹子、螺丝或者其他接口那样的锁扣）。 USB 2. It is tightly coupled with ThreadX. VisaNS; #region UsbRaw. uywphtabfakbkiywejrx