The special I/O connectivity via USB disk

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How the USB come out? The Universal Serial Bus is a cable bus that allows high-speed data exchange between a host computer and a variety of peripherals. Supporting both attachment and removal of peripherals while the host system is running, USB was designed to provide a convenient and universal interface for connecting peripherals to desktop computers, without the need to power down the computer. In this article Barbara provides an introduction to the USB standard, outlining the goals of the USB committee and describes the physical cabling and connectors, the physical and logical bus topologies, the types of data transfers, and the communication flow between the different layers of USB software.

The special I/O connectivity via USB, which is developed for use with desktop peripherals, USB is now commonly used for connecting I/O in industrial and OEM applications. USB is fast and, since the introduction of USB 2.0, can achieve a raw data rate of 480 Mbps. Many SBCs have external USB ports with standard USB Type A connectors and often include convenient internal header connectors with two or more USB ports. This makes aluminum usb disk devices such as CZ51 2GB USB Flash Drive, DT101G2 2GB USB Flash Drive, DTIG3 2GB USB Flash Drive, DT410 2GB USB Flash Drive, KMSD 2G USB Flash Drive, L8321 2GB USB Flash Drive, SFD122 2G USB Flash Drive, SSKMB 2G USB Flash Drive, SSKMI 2G USB Flash Drive easy to implement. However, the point-to-point nature of USB can limit the implementation options for I/O-intensive applications.

One solution for addressing this USB port limitation is to interface multiple modules from a single USB port with USB data acquisition products. Each I/O module can connect to the host with a locking, high-retention USB Type B connector that eliminates accidental disconnection. Modules can include an RS-485 Modbus RTU downstream port for connecting additional expansion modules. This allows up to 246 Modbus RTU I/O expansion modules to be daisy-chained together to achieve the required I/O count using a single USB host connection. Each module is assigned a unique Modbus address that can be set by hardware switch or via software. The host computer uses the standard Modbus protocol to communicate with these modules. Offerings such as Sealevel Systems' SeaI/O USB data acquisition products (Figure 1) can facilitate this process. A lot of problems you can solve easily.