CN210348482U - RS485 interface and RS232 interface automatic switching circuit and electronic equipment - Google Patents
RS485 interface and RS232 interface automatic switching circuit and electronic equipment Download PDFInfo
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Abstract
The embodiment of the application discloses an RS485 interface and RS232 interface automatic switching circuit and electronic equipment. The circuit comprises a microcontroller, an RS232 level conversion circuit, an RS232 interface, a receiving switching circuit, an RS485 receiving and transmitting circuit and an RS485 interface. And the RS232 interface is connected with the RS232 level conversion circuit. And the RS485 interface is connected with the RS485 receiving and transmitting circuit. The RS232 level conversion circuit and the RS485 receiving and transmitting circuit are connected with an RXD pin of the microcontroller through the receiving and switching circuit. And a TXD pin of the microcontroller is connected with the RS232 level conversion circuit and the RS485 receiving and transmitting circuit. In the application, the RS485 interface and the RS232 interface are automatically switched, no jumper wire or special chip is needed, the cost is lower, and the circuit is simpler; and the automatic switching circuit only occupies one serial port interface of the microcontroller, so that the pin resources of the microcontroller can be saved.
Description
Technical Field
The application relates to the technical field of communication, in particular to the technical field of RS485 and RS232 communication interfaces, and specifically relates to an automatic switching circuit for an RS485 interface and an RS232 interface and an electronic device.
Background
The connection between the existing serial ports RS232 and RS485 and the microcontroller is mainly realized by the following two methods:
firstly, an RS232 communication interface and an RS485 communication interface are respectively designed, the microcontroller needs to be provided with two serial communication interfaces, and the RS232 communication interface and the RS485 communication interface are respectively connected to the two serial communication interfaces of the microcontroller.
And secondly, an RS232 communication interface and an RS485 communication interface are respectively designed, the microcontroller needs to be provided with a serial communication interface and is selectively connected to a corresponding RS232 or RS485 data transmission channel of the microcontroller through a jumper wire.
Both of the above methods have the following disadvantages:
in the method I, two serial communication interfaces of the microcontroller are needed, but some microcontrollers only have one serial communication interface, so that inconvenience is caused to chip selection.
In the second method, only one serial communication interface is used, but the jumper needs to be manually operated, and the shell of the controller needs to be opened for jumper in some field use environments, so that the second method has the defects of low reliability, inconvenience in use and the like.
SUMMERY OF THE UTILITY MODEL
One aspect of the application provides an RS485 interface and RS232 interface automatic switching circuit. The RS485 interface and RS232 interface automatic switching circuit can comprise a microcontroller, an RS232 level switching circuit, an RS232 interface, a receiving switching circuit, an RS485 receiving and transmitting circuit and an RS485 interface.
And the RS232 interface is connected with the RS232 level conversion circuit. And the RS485 interface is connected with the RS485 receiving and transmitting circuit. The RS232 level conversion circuit and the RS485 receiving and transmitting circuit are connected with an RXD pin of the microcontroller through the receiving switching circuit. And a TXD pin of the microcontroller is connected with the RS232 level conversion circuit and the RS485 transceiving circuit.
According to some preferred embodiments of the present application, the RS232 level shift circuit includes a first chip U1. The first chip U1 is an SP232EEN-L/TR chip. Pin 1 and pin 3 of the SP232EEN-L/TR chip are connected by a first capacitor C1. Pin 2 of the SP232EEN-L/TR chip is connected to ground through a second capacitor C2. And the pin 4 and the pin 5 of the SP232EEN-L/TR chip are connected through a third capacitor C3. Pin 6 of the SP232EEN-L/TR chip is connected to ground through a fourth capacitor C4. The pin 11 of the SP232EEN-L/TR chip is connected to the TXD pin of the microcontroller. The pin 12 of the SP232EEN-L/TR chip is connected with the receiving switching circuit. And the pin 13 of the SP232EEN-L/TR chip is connected with the RXD pin of the RS232 interface. And the pin 14 of the SP232EEN-L/TR chip is connected with the TXD pin of the RS232 interface. The pin 15 of the SP232EEN-L/TR chip is grounded. The pin 16 of the SP232EEN-L/TR chip is connected to a power supply.
According to some preferred embodiments of the present application, the RS485 transceiver circuit includes a second chip U2. The second chip U2 is a MAX13487EESA chip. The pin 1 of the MAX13487EESA chip is connected to the receive switching circuit. And the pin 2 and the pin 3 of the MAX13487EESA chip are connected with a power supply through a third resistor R3. Pin 4 of the MAX13487EESA chip is connected to the TXD pin of the microcontroller. Pin 5 of the MAX13487EESA chip is grounded. And the pin 6 of the MAX13487EESA chip is connected with the D + pin of the RS485 interface. And, pin 6 of the MAX13487EESA chip is connected to the power supply through a first resistor R1. And the pin 7 of the MAX13487EESA chip is connected with the D-pin of the RS485 interface. And, the pin 7 of the MAX13487EESA chip is grounded through a second resistor R2. Pin 8 of the MAX13487EESA chip is connected to a power supply.
According to some preferred embodiments of the present application, the reception switching circuit includes a first diode D1 and a second diode D2. The anodes of the first diode D1 and the second diode D2 are both connected with the RXD pin of the microcontroller. And, the anodes of the first diode D1 and the second diode D2 are connected to a power source through a fourth resistor R4. The cathode of the first diode D1 is connected to pin 12 of the SP232EEN-L/TR chip. The cathode of the first diode D1 is connected to a power supply via a fifth resistor R5. The cathode of the second diode D2 is connected with pin 1 of the MAX13487EESA chip. The cathode of the second diode D2 is connected to a power supply via a sixth resistor R6.
According to some preferred embodiments of the present application, the first diode D1 and the second diode D2 are both SS14 schottky diodes.
According to some preferred embodiments of the present application, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are resistors having a resistance of 10K Ω.
According to some preferred embodiments of the present application, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are all capacitors having a capacitance value of 0.1 μ F.
According to some preferred embodiments of the present application, the first resistor R1 and the second resistor R2 are resistors having a resistance of 10K Ω.
According to some preferred embodiments of the present application, the third resistor R3 is a resistor with a resistance of 1K Ω.
Another aspect of the present application provides an electronic device. The electronic device can comprise the RS485 interface and RS232 interface automatic switching circuit.
Compared with the prior art, the RS485 interface and RS232 interface automatic switching circuit has the following beneficial effects:
by adopting the RS485 interface and RS232 interface automatic switching circuit, the RS485 interface and the RS232 interface can be automatically switched, no jumper wire is needed, no special chip is needed, the cost is lower, and the circuit is simpler; in addition, the RS485 interface and the RS232 interface automatic switching circuit only occupy one serial port interface of the microcontroller, and therefore pin resources of the microcontroller can be saved.
Additional features of the present application will be set forth in part in the description which follows. Additional features of some aspects of the present application will be apparent to those of ordinary skill in the art in view of the following description and accompanying drawings, or in view of the production or operation of the embodiments. The features disclosed in this application may be realized and attained by practice or use of various methods, instrumentalities and combinations of the specific embodiments described below.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. Like reference symbols in the various drawings indicate like elements. Wherein the content of the first and second substances,
fig. 1 is a schematic circuit diagram of an RS485 interface and RS232 interface automatic switching circuit according to some embodiments of the present application;
fig. 2 is a circuit diagram of an RS232 level shift circuit in an RS485 interface and RS232 interface automatic switching circuit according to some embodiments of the present application;
fig. 3 is a circuit diagram of an RS485 transceiver circuit in an RS485 interface and RS232 interface automatic switching circuit according to some embodiments of the present application;
fig. 4 is a circuit diagram of a receive switching circuit in an RS485 interface and RS232 interface automatic switching circuit according to some embodiments of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that if the terms "first", "second", etc. are used in the description and claims of this application and in the above-described drawings, they are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, if the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, if the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", etc. are referred to, their indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, in this application, the terms "mounted," "disposed," "provided," "connected," "sleeved," and the like should be construed broadly if they are referred to. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the application discloses an automatic switching circuit of an RS485 interface and an RS232 interface on the one hand.
Fig. 1 is a schematic circuit diagram of an RS485 interface and an RS232 interface automatic switching circuit according to some embodiments of the present application.
As shown in fig. 1, the RS485 interface and RS232 interface automatic switching circuit may include a microcontroller, an RS232 level conversion circuit, an RS232 interface, a receiving switching circuit, an RS485 transceiver circuit, and an RS485 interface.
In some embodiments, the microcontroller may be selected according to actual needs. For example, the microcontroller may be selected from microcontrollers such as STC89C51, AT89C51, or STC89C52 RC.
As shown in fig. 1, the RS232 interface is connected to an RS232 level shift circuit. And the RS485 interface is connected with the RS485 receiving and transmitting circuit. The RS232 level conversion circuit and the RS485 receiving and transmitting circuit are connected with an RXD pin of the microcontroller through the receiving and switching circuit. And a TXD pin of the microcontroller is also connected with the RS232 level conversion circuit and the RS485 receiving and transmitting circuit.
As shown in fig. 2, the RS232 level shifter circuit includes a first chip U1. In some embodiments, the first chip U1 is an SP232EEN-L/TR chip.
In some embodiments, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 may each have a capacitance of 0.1 μ F.
The pin 12 of the SP232EEN-L/TR chip is connected to the receive switch circuit.
As shown in fig. 3, the RS485 transceiver circuit includes a second chip U2. In some embodiments, the second chip U2 is a MAX13487EESA chip.
In some embodiments, the first resistor R1 and the second resistor R2 may each employ a resistor having a resistance of 10K Ω. The third resistor R3 may be a resistor having a resistance of 1K Ω.
As shown in fig. 4, the reception switching circuit includes a first diode D1 and a second diode D2. The anodes of the first diode D1 and the second diode D2 are both connected to the RXD pin of the microcontroller. And, the anodes of the first diode D1 and the second diode D2 are connected to the power supply through the fourth resistor R4. The cathode of the first diode D1 is connected to pin 12 of the SP232EEN-L/TR chip. The cathode of the first diode D1 is connected to the power supply via a fifth resistor R5. The cathode of the second diode D2 is connected to pin 1 of the MAX13487EESA chip. The cathode of the second diode D2 is connected to the power supply via a sixth resistor R6.
In some embodiments, the first diode D1 and the second diode D2 may both employ schottky diodes. For example, a SS14 schottky diode may be used.
In some embodiments, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 may each employ a resistor having a resistance of 10K Ω.
The working principle of the automatic switching circuit for the RS485 interface and the RS232 interface of the embodiment of the application is as follows:
the anodes of diodes D1 and D2 in the receiving switching circuit are connected with the microcontroller RXD and the pull-up resistor R4, and the cathode of D1 is connected with the RXD _232 signal of the RS232 chip and the pull-up resistor R5. The negative electrode of the D2 is connected with the RXD _485 signal of the RS485 chip and a pull-up resistor R6.
Under the condition that no communication signal is input, the RXD _232 signal of the RS232 chip and the RXS _485 signal of the RS485 chip default to high level.
When RS232 is used for communication:
when the RS232 inputs a high level signal, the RS232 level shift circuit outputs RXD _232 also at a high level. Due to the one-way conductivity of the diode D1, the RXD signal connected to the microcontroller is unaffected and is high.
When the RS232 inputs a low level signal, the RS232 level shift circuit outputs RXD _232 also at a low level. At this time, since the cathode of the diode D1 is at a low level and the anode thereof is at a high level, the diode is turned on, and the RXD signal connected to the microcontroller becomes at a low level. At this time, the anode of the diode D2 is at a low level and the cathode thereof is at a high level, so that the diode has unidirectional conductivity, and thus, no interference is caused on the RXD signal.
When RS485 is used for communication:
when the RS485 inputs a high level signal, the output RXD _485 of the RS485 receiving and transmitting circuit is also high level. Due to the one-way conductivity of the diode D2, the RXD signal connected to the microcontroller is unaffected and is high.
When the RS485 inputs a low level signal, the output RXD _485 of the RS485 receiving and transmitting circuit is also low level. At this time, since the cathode of the diode D2 is at a low level and the anode thereof is at a high level, the diode is turned on, and the RXD signal connected to the microcontroller becomes at a low level. At this time, the anode of the diode D4 is at a low level and the cathode thereof is at a high level, so that the diode has unidirectional conductivity, and thus, no interference is caused on the RXD signal.
By adopting the RS485 interface and RS232 interface automatic switching circuit, the RS485 interface and the RS232 interface can be automatically switched without jumper wires and special chips, so that the cost is lower and the circuit is simpler; in addition, the RS485 interface and the RS232 interface automatic switching circuit only occupy one serial port interface of the microcontroller, and therefore pin resources of the microcontroller can be saved.
Another aspect of an embodiment of the present application discloses an electronic device.
The electronic device comprises the RS485 interface and RS232 interface automatic switching circuit as described in any one of the above.
For example, the electronic device may be a computer, a television, a printer, a facsimile machine, a kiosk, an industrial personal computer, a server, or the like.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
The beneficial effects that may be brought by the embodiments of the present application include, but are not limited to:
1. only one serial port interface of the microcontroller is occupied, and therefore the pin resources of the microcontroller are saved.
RS485 and RS232 automatic switch, firstly do not need the wire jumper, secondly do not need special chip, the cost is lower, and the circuit is simpler.
It should be noted that the above-mentioned embodiments are exemplary, and those skilled in the art can devise various solutions in light of the present disclosure, which are also within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present specification and drawings are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (10)
- The RS485 interface and RS232 interface automatic switching circuit is characterized by comprising a microcontroller, an RS232 level conversion circuit, an RS232 interface, a receiving switching circuit, an RS485 receiving and transmitting circuit and an RS485 interface;the RS232 interface is connected with the RS232 level conversion circuit;the RS485 interface is connected with the RS485 receiving and transmitting circuit;the RS232 level conversion circuit and the RS485 receiving and transmitting circuit are connected with an RXD pin of the microcontroller through the receiving switching circuit;and a TXD pin of the microcontroller is connected with the RS232 level conversion circuit and the RS485 transceiving circuit.
- 2. The RS485 interface and RS232 interface automatic switching circuit according to claim 1, wherein the RS232 level shift circuit includes a first chip U1;the first chip U1 is an SP232EEN-L/TR chip;the pin 1 and the pin 3 of the SP232EEN-L/TR chip are connected through a first capacitor C1;pin 2 of the SP232EEN-L/TR chip is grounded through a second capacitor C2;the pin 4 and the pin 5 of the SP232EEN-L/TR chip are connected through a third capacitor C3;the pin 6 of the SP232EEN-L/TR chip is grounded through a fourth capacitor C4;the pin 11 of the SP232EEN-L/TR chip is connected with the TXD pin of the microcontroller;the pin 12 of the SP232EEN-L/TR chip is connected with the receiving switching circuit;the pin 13 of the SP232EEN-L/TR chip is connected with the RXD pin of the RS232 interface;the pin 14 of the SP232EEN-L/TR chip is connected with the TXD pin of the RS232 interface;the pin 15 of the SP232EEN-L/TR chip is grounded;the pin 16 of the SP232EEN-L/TR chip is connected to a power supply.
- 3. The RS485 interface and RS232 interface automatic switching circuit according to claim 2, wherein the RS485 transceiver circuit includes a second chip U2;the second chip U2 is a MAX13487EESA chip;the pin 1 of the MAX13487EESA chip is connected with the receiving switching circuit;the pin 2 and the pin 3 of the MAX13487EESA chip are connected with a power supply through a third resistor R3;the pin 4 of the MAX13487EESA chip is connected with the TXD pin of the microcontroller;pin 5 of the MAX13487EESA chip is grounded;the pin 6 of the MAX13487EESA chip is connected with the D + pin of the RS485 interface; in addition, the pin 6 of the MAX13487EESA chip is connected with a power supply through a first resistor R1;the pin 7 of the MAX13487EESA chip is connected with the D-pin of the RS485 interface; moreover, the pin 7 of the MAX13487EESA chip is grounded through a second resistor R2;pin 8 of the MAX13487EESA chip is connected to a power supply.
- 4. The RS485 interface and RS232 interface automatic switching circuit of claim 3, wherein the receiving switching circuit comprises a first diode D1 and a second diode D2;the anodes of the first diode D1 and the second diode D2 are both connected with the RXD pin of the microcontroller; the anodes of the first diode D1 and the second diode D2 are connected to a power supply through a fourth resistor R4;the negative electrode of the first diode D1 is connected with the pin 12 of the SP232EEN-L/TR chip; the cathode of the first diode D1 is connected to a power supply via a fifth resistor R5;the cathode of the second diode D2 is connected with pin 1 of the MAX13487EESA chip; the cathode of the second diode D2 is connected to a power supply via a sixth resistor R6.
- 5. The RS485 interface and RS232 interface automatic switching circuit of claim 4, wherein the first diode D1 and the second diode D2 are SS14 Schottky diodes.
- 6. The RS485 interface and RS232 interface automatic switching circuit of claim 4, wherein the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are resistors with resistance of 10K Ω.
- 7. The RS485 interface and RS232 interface automatic switching circuit according to any of claims 2-6, wherein the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are all capacitors with a capacitance of 0.1 μ F.
- 8. The RS485 interface and RS232 interface automatic switching circuit according to any of claims 3 to 6, wherein the first resistor R1 and the second resistor R2 are resistors with a resistance of 10K Ω.
- 9. The RS485 interface and RS232 interface automatic switching circuit according to any one of claims 3 to 6, wherein the third resistor R3 is a resistor with a resistance value of 1K Ω.
- 10. Electronic equipment, characterized in that the electronic equipment comprises an RS485 interface and RS232 interface automatic switching circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920868759.XU CN210348482U (en) | 2019-06-10 | 2019-06-10 | RS485 interface and RS232 interface automatic switching circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920868759.XU CN210348482U (en) | 2019-06-10 | 2019-06-10 | RS485 interface and RS232 interface automatic switching circuit and electronic equipment |
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| CN210348482U true CN210348482U (en) | 2020-04-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110188061A (en) * | 2019-06-10 | 2019-08-30 | 上海乾申软件科技有限公司 | RS485 interface and RS232 interface automatic switch-over circuit and electronic equipment |
| CN113422599A (en) * | 2021-06-25 | 2021-09-21 | 厦门科灿信息技术有限公司 | RS485 automatic receiving and transmitting control device and communication equipment |
| CN117176135A (en) * | 2023-08-31 | 2023-12-05 | 深达威科技(广东)股份有限公司 | Shared port circuit and shared port equipment of RS232 and RS485 |
| CN117176135B (en) * | 2023-08-31 | 2024-05-31 | 深达威科技(广东)股份有限公司 | Shared port circuit and shared port equipment of RS232 and RS485 |
-
2019
- 2019-06-10 CN CN201920868759.XU patent/CN210348482U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110188061A (en) * | 2019-06-10 | 2019-08-30 | 上海乾申软件科技有限公司 | RS485 interface and RS232 interface automatic switch-over circuit and electronic equipment |
| CN113422599A (en) * | 2021-06-25 | 2021-09-21 | 厦门科灿信息技术有限公司 | RS485 automatic receiving and transmitting control device and communication equipment |
| CN117176135A (en) * | 2023-08-31 | 2023-12-05 | 深达威科技(广东)股份有限公司 | Shared port circuit and shared port equipment of RS232 and RS485 |
| CN117176135B (en) * | 2023-08-31 | 2024-05-31 | 深达威科技(广东)股份有限公司 | Shared port circuit and shared port equipment of RS232 and RS485 |
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Address after: Room 1001, 1st floor, 555 Dongchuan Road, Minhang District, Shanghai, 2001 (Centralized Registration Place) Patentee after: Shanghai qianshen Technology (Group) Co., Ltd Address before: 200241, room 7090, Ding Lou, 555 Dongchuan Road, Shanghai, Minhang District Patentee before: SHANGHAI CHAINSUM SOFTWARE TECHNOLOGY Co.,Ltd. |