CN211062035U

CN211062035U - Isolated RS232 serial bus transceiver

Info

Publication number: CN211062035U
Application number: CN201922109625.2U
Authority: CN
Inventors: 安建华; 丁朋飞; 程守虎; 侯亚伟; 张振岭
Original assignee: 713th Research Institute of CSIC
Current assignee: 713th Research Institute of CSIC
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-07-21
Anticipated expiration: 2029-11-29

Abstract

An isolated RS232 serial bus transceiver device comprises an RS232 serial bus transceiver and a power module, wherein the power module is connected with the RS232 serial bus transceiver and provides required power for the device; the control system power-taking interface is connected with the RS232 serial bus transceiver and directly takes power from the control system when the power module does not supply power; the control system signal interface is connected with the RS232 serial bus transceiver and is used for controlling a signal RS232 serial bus signal access port; the RS232 serial signal output end is connected with the RS232 serial bus transceiver and outputs the processed signal and is connected with other RS232 serial communication nodes; and providing the required isolated power supply DC-DC of the isolated power supply for the RS232 serial bus transceiver. The utility model adopts wide power supply voltage input, can also get electricity from the control system, and is convenient and practical; the high-voltage isolation device is suitable for high-voltage isolation, and the isolation voltage is 2.5 kV.

Description

Isolated RS232 serial bus transceiver

Technical Field

The utility model relates to an isolated form RS232 serial bus transceiver for control system's RS232 serial bus communication under complicated electromagnetic environment can effectively improve control system RS232 serial bus communication's reliability.

Background

The serial communication RS232 bus technology is widely applied to the control field. The existing industrial control environment is generally severe, especially serious in electromagnetic interference, which affects the stability of the control system to a certain extent, so that during system design, an anti-interference design is needed, and especially, certain isolation measures need to be taken for communication between the control system and external equipment. The traditional RS232 serial bus transceiver has no isolation, needs to design a special isolation circuit for a bus communication circuit, has low communication speed and low isolation voltage, and has limited application in a higher requirement environment to some extent.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the isolation type RS232 serial bus transceiver is provided, has high communication speed and high isolation voltage, is stable and reliable, and is suitable for RS232 serial bus communication of a control system in a complex environment.

The purpose of the utility model is realized with the following mode:

an isolated RS232 serial bus transceiver device comprises an RS232 serial bus transceiver and a power module, wherein the power module is connected with the RS232 serial bus transceiver and provides required power for the device; the control system power-taking interface is connected with the RS232 serial bus transceiver and directly takes power from the control system when the power module does not supply power; the control system signal interface is connected with the RS232 serial bus transceiver and is used for controlling a signal RS232 serial bus signal access port; the RS232 serial signal output end is connected with the RS232 serial bus transceiver and outputs the processed signal and is connected with other RS232 serial communication nodes; and the isolation power supply DC-DC is connected with the RS232 serial bus transceiver and provides the required isolation power supply for the RS232 serial bus transceiver.

The power supply module adopts wide power supply voltage input, and the voltage range is 9-40V.

The power supply of the power supply module is connected to a power supply chip L M2596 after being filtered by a capacitor, and stable power supply voltage is obtained after the power supply is output through a power inductor and a filter capacitor.

The RS232 serial bus transceiver adopts a chip ADM 3251E.

The RS232 serial bus transceiver comprises a fifteenth pin, a sixteenth pin, an eighth pin, a ninth pin, a second pin, a third pin and a second zero pin, wherein the fifteenth pin is R-IN, the sixteenth pin is T-OUT, the eighth pin is R-OUT, the ninth pin is T-IN, the second pin is VCC, the third pin is VCC, and the second zero pin is V-ISO; the fifteenth pin and the sixteenth pin are accessed to an RS232 serial signal of the control system; the eighth pin and the ninth pin output signals processed by the RS232 serial bus transceiver to other RS232 serial bus equipment; the second pin and the third pin are power supply parts of the chip; and the second zero pin is an isolation power supply DC-DC power supply access end.

The isolation power supply adopts a chip DCPA 10505.

Compared with the prior art, the utility model adopts wide power supply voltage input, the voltage range is 9V-40V, and the electricity can be also taken from the control system, thereby being convenient and practical; the high-voltage isolation device is suitable for high-voltage isolation, and the isolation voltage is 2.5 kV.

Drawings

FIG. 1 is a block diagram of the present invention;

fig. 2 is a schematic diagram of the circuit of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.

In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only relational terms determined for convenience of describing structural relationships of the respective parts or elements of the present invention, and are not intended to refer to any part or element of the present invention, and are not to be construed as limiting the present invention.

In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and may be fixedly connected, or may be integrally connected or detachably connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.

The RS232 serial bus transceiver adopts a chip ADM 3251E.

The isolation power supply adopts a chip DCPA 10505.

The power supply is accessed by MF1, the voltage range can be selected to be 9-40V, the power supply is accessed to a power supply chip L M2596 after being filtered by a capacitor, the output is passed through a power inductor, a filter capacitor and the like to obtain stable 5V power supply voltage, if no external power supply exists, the 5V power supply can be directly accessed from a control system through an MF2 interface, an RS232 signal of the control system is accessed to the device through P4, is accessed to

pins

15 and 16 of an RS232 bus transceiver chip ADM3251E, is output to other RS232 bus equipment to be communicated through

pins

8 and 9 after signal processing,

pins

2, 3 and 20 are respectively a power supply part of the chip and an isolation power supply part, and are connected with a filter capacitor and a decoupling capacitor, and the required isolation power supply is provided by a U4 chip DCPA 10505.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and changes may be made without inventive changes in the technical solutions of the present invention.

Claims

1. An isolated RS232 serial bus transceiver device comprises an RS232 serial bus transceiver, and is characterized in that: the power supply module is connected with the RS232 serial bus transceiver and provides required power supply for the device; the control system power-taking interface is connected with the RS232 serial bus transceiver and directly takes power from the control system when the power module does not supply power; the control system signal interface is connected with the RS232 serial bus transceiver and is used for controlling a signal RS232 serial bus signal access port; the RS232 serial signal output end is connected with the RS232 serial bus transceiver and outputs the processed signal and is connected with other RS232 serial communication nodes; and the isolation power supply DC-DC is connected with the RS232 serial bus transceiver and provides the required isolation power supply for the RS232 serial bus transceiver.

2. The isolated RS232 serial bus transceiver of claim 1, wherein: the power supply module adopts wide power supply voltage input, and the voltage range is 9-40V.

3. The isolated RS232 serial bus transceiver of claim 1, wherein the power supply of the power supply module is filtered by a capacitor and then connected to a power chip L M2596, and the output is filtered by a power inductor and a filter capacitor to obtain a stable power supply voltage.

4. The isolated RS232 serial bus transceiver of claim 1, wherein: the RS232 serial bus transceiver adopts a chip ADM 3251E.

5. The isolated RS232 serial bus transceiver of claim 4, wherein: the RS232 serial bus transceiver comprises a fifteenth pin, a sixteenth pin, an eighth pin, a ninth pin, a second pin, a third pin and a second zero pin, wherein the fifteenth pin is R-IN, the sixteenth pin is T-OUT, the eighth pin is R-OUT, the ninth pin is T-IN, the second pin is VCC, the third pin is VCC, and the second zero pin is V-ISO; the fifteenth pin and the sixteenth pin are accessed to an RS232 serial signal of the control system; the eighth pin and the ninth pin output signals processed by the RS232 serial bus transceiver to other RS232 serial bus equipment; the second pin and the third pin are power supply parts of the chip; and the second zero pin is an isolation power supply DC-DC power supply access end.

6. The isolated RS232 serial bus transceiver of claim 1, wherein: the isolation power supply adopts a chip DCPA 10505.