what is otg

OTG is the abbreviation of On-The-Go. It is an emerging technology that is mainly used to connect different devices or mobile devices for data exchange. Through OTG technology, USB interface accessories can be added to smart terminals to enrich the functions of smart terminals, such as extending remote control accessories to turn mobile phones and tablets into universal remote controls.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

OTG is the abbreviation of On-The-Go, which is a technology developed in recent years. Announced by the USB Standardization Organization on December 18, 2001, it is mainly used to connect different devices or mobile devices for data exchange.

OTG improves Pads (tablets), mobile phones, and consumer devices. The inconvenience caused by changing multiple different format connectors between devices such as digital cameras, camcorders, printers, etc., and exchanging data between up to 7 formats of memory cards.

Function

OTG technology allows data transmission between devices without a host (Host). For example, a digital camera is directly connected to a printer, and the USB port between the two devices is connected through OTG technology, and the photos taken are immediately printed; the data in the digital camera can also be sent to a mobile hard disk with a USB interface through OTG. , there is no need to carry expensive memory cards or carry a portable computer for field operations.

Through OTG technology, USB interface accessories can be added to smart terminals to enrich the functions of smart terminals, such as extending remote control accessories to turn mobile phones and tablets into universal remote controls.

Principles

1. Design principles

With the popularity of consumer products such as PADs (tablet computers), mobile phones, digital cameras, and printers , The high-speed data transmission technology used between these devices and computers, or between devices and devices has attracted more and more attention. IEEE1394 and USB are the two main standards used for such transmission.

Both standards provide plug-and-play and hot-swappable functions, both can provide power to the outside, and both support the connection of multiple devices. Among them, IEEE1394 supports higher data transmission speed, but is relatively complicated and expensive. It is mainly used for AV products that require high-speed communication; while the original USB standard is mainly for low-speed data transmission applications, of which USB1.1 supports 1.5Mbps and The transmission rate of 12Mbps is widely used in PC peripherals that do not require high transmission rates, such as keyboards, mice, etc. The introduction of the USB2.0 standard brings the USB transmission speed to 480Mbps. The introduction of USB OTG technology can realize data transmission between devices without a host. For example: digital cameras can be directly connected to printers and print photos, thereby expanding the application scope of USB technology.

2. Related principles

Everyone knows that since the birth of the USB transmission protocol in 1996, it has quickly become popular among all computer peripherals and digital devices with its advantages. Everyone knows that USB devices It is divided into HOST (master device) and SLAVE (slave device). Data transmission can only be realized when a HOST is connected to a SLAVE. The OTG device is our "EX" and can act as both a HOST and a SLAVE.

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