Device and method for realizing multiuser access to USB equipment

Abstract

The invention discloses a device and method for realizing multiuser access to USB equipment. By means of the device and the method provided by the invention, users can use TCP (Transmission Control Protocol) ports to realize remote access crossing IP networks and can access USB equipment connected to corresponding USB physical ports through the TCP ports which are used during remote access and are mapped to the corresponding physical ports. Because the same TCP port number is not limited to be used by users logged in the same PC (Personal Computer), the access limit on the single USB mainframe to the USB equipment can be avoided to realize real multiuser access; and the access to the USB equipment through the IP networks is also beneficial to avoiding spatial position limitations of the USB equipment. In addition, the mapping relation between the TCP ports and the USB physical ports can be established according to the corresponding relationship between the TCP ports configured for users and silk screen numbers of the USB physical ports, and thus, the management of the USB equipment is facilitated.

Description

Apparatus and method for realizing multi-user access to USB device technical field The invention relates to universal serial bus (USB) technology, in particular to a device for realizing multi-user access to USB equipment and a method for realizing multi-user access to USB equipment. Background technique The USB protocol is a common peripheral connection specification, or in other words, the USB protocol is a peripheral serial communication interface standard. USB has the characteristics of hot plugging, reliable data transmission, convenient expansion, and low cost, and has become a necessary peripheral interface for current electronic equipment. The topology system of the USB system is mainly composed of three elements: the USB host (Host), the USB hub (Hub) and the USB device (Node). At least one USB hub is cascaded with the USB devices. With the popularity of USB technology, the USB interface gradually began to replace the traditional RS-232 serial interface. In or...

AI Technical Summary

Problems solved by technology

Taking the structure shown in Figure 1 as an example, the user can only access the datacom device A to the datacom device C and realize the management operation of the datacom device A to the datacom device C only after logging in to the PC as the USB host. For users who log in to other non-USB host PCs not shown in Figure 1, unless the non-USB host PC is changed to a USB host by changing the USB cable, otherwise, it is impossible to pass the datacom device A to the datacom The USB interface of device C accesses datacom equipment A ~ datacom equipment C, so it is impossible to realize the management operation of datacom equipment A ~ datacom equipment C, that is to say, the datacom equipment A ~ can be accessed through the USB interface Datacom device C, and the management of datacom device A ~ datacom device C are limited to users who log in to the USB host

2. Since the USB system is used to judge the timeout of data transmission is realized through the hardware handshake signal, and too much delay on the USB connection line will lead to timeout errors in data transmission, therefore, the USB system requires each segment to be directly connected. The length of the USB cable does not exceed 5 meters, and the cascade connection using the USB hub does not exceed level 5 (the root hub integrated in the USB host is not counted), so that the maximum distance between the USB host and the USB device in the USB system cannot more than 30m

Therefore, it is difficult for the user to distinguish whether the COM port 1 corresponds to the data communication device A or the data communication device B, which brings a lot of inconvenience to the user for the management of all data communication devices

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