RS232/422/485 serial module based on USB interface

A USB interface and serial port technology, applied in the field of computer bus interface against harsh environments, can solve problems such as poor common mode rejection, and achieve the effects of fast signal response time, high integration, and improved installation and maintenance efficiency.

Inactive Publication Date: 2017-05-10
716TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the difference between the sending level and the receiving level is only about 2V to 3V, its common mode rejection ability is poor, coupled with the distributed capacitance on the twisted pair, the maximum transmission distance is about 15 meters, and the highest rate is 20kb / s

Method used

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  • RS232/422/485 serial module based on USB interface
  • RS232/422/485 serial module based on USB interface
  • RS232/422/485 serial module based on USB interface

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Embodiment Construction

[0028] Such as figure 1 As shown, the present invention is based on the RS232 / 422 / 485 serial port module of the USB interface, including the upstream USB interface circuit of the USB / HUB controller connected in turn, the USB / HUB controller and four USB signal transceiver circuits, wherein each USB signal The transceiver circuit includes USB / UART controller, RS232 interface and UART signal isolation circuit, interface circuit and protection circuit of RS422 / 485 transceiver; among them, RS232 interface and UART signal isolation circuit includes RS232 transceiver and magnetic isolator; USB / HUB The controller is connected with all USB / UART controllers to form a connection circuit between the USB / HUB controller and the USB / UART controller;

[0029] The upstream USB interface circuit of the USB / HUB controller implements the USB bus signal of the external host to be connected to the USB / HUB controller, and the connection circuit between the USB / HUB controller and the USB / UART control...

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Abstract

The invention discloses an RS232/422/485 serial module based on a USB interface. The module comprises an uplink USB interface circuit of a USB/HB controller, the USB/HUB controller and a plurality of USB signal transceiving circuits, which are successively connected, wherein each of the USB signal transceiving circuits comprises a USB/UART controller, an RS232 interface and an UART signal isolating circuit, an interface circuit of an RS422/485 transceiver and a protective circuit; the USB/HUB controller is connected to all the USB/UART controllers to form a connecting circuit of the USB/HUB controller and the UART controllers. The module realizes the USB interface, and an RS232/422/485 communication node or RS232/422/485 communication test equipment can be constructed by way of USB hot plugging.

Description

technical field [0001] The invention belongs to the technical field of anti-harsh environment computer bus interface, in particular to an RS232 / 422 / 485 serial port module circuit based on a USB interface. Background technique [0002] The serial interface includes RS232, RS422, RS485, etc. according to electrical standards and protocols. RS232 adopts an unbalanced transmission method, which is the so-called single-ended communication. Since the difference between the sending level and the receiving level is only about 2V to 3V, its common mode rejection ability is poor, coupled with the distributed capacitance on the twisted pair, the maximum transmission distance is about 15 meters, and the highest rate is 20kb / s. The full name of the RS422 standard is "Electrical Characteristics of Balanced Voltage Digital Interface Circuit". Since the receiver adopts high input impedance and the transmission driver has a stronger driving capability than RS232, it allows multiple receiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/42
CPCG06F13/4286G06F2213/0002G06F2213/0042
Inventor 郑波祥朱勇吴亮王羽沙万里鲜于运香刘宝明郭峰孟广群沈浩
Owner 716TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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