Serial interface transmission multiplexing circuit

Abstract

The utility model provides a serial interface transmission multiplexing circuit, which comprises an integrated circuit U2, capacitors C1-C5, resistors R1-R5, a female header connector U1, a pin connector U3 and a USB (Universal Serial Bus) connector USB1, the model of the U2 is MAX3232IDR, a contact 1 of the female header connector U1 is respectively connected with a 3.3 V power supply network and a first end of the resistor R1, and a second end of the resistor R1 is connected with a contact 4 of the female header connector U1; a contact 2 of the female header connector U1 is simultaneously connected with a pin 11 of the integrated circuit U2, a first end of the resistor R2 and a first end of the resistor R4; a contact 3 of the female header connector U1 is simultaneously connected with a pin 12 of the integrated circuit U2, a first end of the resistor R3 and a first end of the resistor R5; the circuit can realize serial port TTL (Transistor-Transistor Logic)-to-RS-232 level conversion and serial port data wireless transmission functions through simple component configuration under the same circuit design, and reduces the production difficulty of products.

Description

Technical Field

[0001] The utility model belongs to the technical field of control circuits, and in particular relates to a serial interface transmission multiplexing circuit. Background Art

[0002] As a common data transmission interface, the serial communication interface has been widely used in computers and various electronic product circuits since its birth in the 1980s because of its concise communication protocol, simple hardware structure, and low implementation cost. It is used for communication between various electronic components or devices. In common circuits, the serial port signals of components such as CPU, MCU or single-chip microcomputer often use the "TTL" level, but because the transmission distance is short and it is susceptible to interference, in actual use, a separate circuit or circuit module is required to convert the signal into protocols such as "RS-232", "RS-485" or directly use wireless transmission. In this case, different peripheral circuits often need to be designed based on different application requirements, which leads to problems such as complex circuit development and poor product versatility. Summary of the invention

[0003] In view of this, the utility model aims to overcome the shortcomings of the above-mentioned problems in the prior art and proposes a serial interface transmission multiplexing circuit, which is used for serial port "TTL" to "RS-232" level wired transmission, serial port wireless transmission and other scenarios through the placement of different components to solve the problems mentioned in the above background technology.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A serial interface transmission multiplexing circuit includes an integrated circuit U2, capacitors C1-C5, resistors R1-R5, a female connector U1, a pin connector U3, and a USB connector USB1; wherein the model of the integrated circuit U2 is MAX3232IDR;

[0006] The contact 1 of the female connector U1 is respectively connected to the 3.3V power supply network and the first end of the resistor R1, and the second end of the resistor R1 is connected to the contact 4 of the female connector U1; the contact 2 of the female connector U1 is simultaneously connected to the pin 11 of the integrated circuit U2, the first end of the resistor R2 and the first end of the resistor R4; the contact 3 of the female connector U1 is simultaneously connected to the pin 12 of the integrated circuit U2, the first end of the resistor R3 and the first end of the resistor R5; the contacts 5 and 6 of the female connector U1 are simultaneously connected to the ground network GND;

[0007] Pin 1 of the integrated circuit U2 is connected to the first end of the capacitor C2, and the second end of the capacitor C2 is connected to pin 3 of the integrated circuit U2; pin 2 of the integrated circuit U2 is connected to the first end of the capacitor C3; pin 4 of the integrated circuit U2 is connected to the first end of the capacitor C4, and the second end of the capacitor C4 is connected to pin 5 of the integrated circuit U2; pins 7, 8, 9 and 10 of the integrated circuit U2 are suspended; pin 13 of the integrated circuit U2 is connected to contact 3 of the pin connector U3; pin 14 of the integrated circuit U2 is connected to contact 2 of the pin connector U3; pin 16 of the integrated circuit U2 is simultaneously connected to the first end of the capacitor C1 and connected to the 3.3V power supply network; pin 15 of the integrated circuit U2 is connected to the ground network GND; the second end of the capacitor C1, the second end of the capacitor C3, and the second end of the capacitor C5 are simultaneously connected to the ground network GND;

[0008] The contact 1 of the pin connector U3 is connected to the 3.3V power supply network 3V3; the contact 4 of the pin connector U3 is connected to the ground network GND;

[0009] Contact 1 of the USB connector USB1 is connected to the 3.3V power network 3V3; contact 2 of the USB connector USB1 is simultaneously connected to the second end of resistor R2 and the second end of resistor R5; contact 2 of the USB connector USB1 is simultaneously connected to the second end of resistor R3 and the second end of resistor R4; contacts 4 and 5 of the USB connector USB1 are simultaneously connected to the ground network GND.

[0010] Furthermore, the pin spacing of the female connector U1 is 2.0 mm.

[0011] Furthermore, the model of the pin connector U3 is XH2.54 female socket.

[0012] Furthermore, the USB1 is a type-A USB male connector.

[0013] Furthermore, the capacitance of capacitors C1, C2, C3, C4, and C5 is 0.1 uF.

[0014] Furthermore, the resistance values ​​of the resistors R1, R2, R3, R4, and R5 are 0Ω.

[0015] Compared with the prior art, the serial interface transmission multiplexing circuit described in the utility model has the following advantages:

[0016] Through the circuit of the utility model, under the same circuit design, through simple component configuration, functions such as serial port "TTL" conversion to "RS-232" level and serial port data wireless transmission can be realized, thereby improving the versatility of the same product for different needs and reducing the difficulty of product production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0018] Figure 1 The utility model is a circuit schematic diagram of a serial interface transmission multiplexing circuit. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0020] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0023] like Figure 1 As shown, the utility model provides a serial interface transmission multiplexing circuit, including an integrated circuit U2, capacitors C1-C5, resistors R1-R5, a female connector U1, a pin connector U3, and a USB connector USB1. Among them, the model of the integrated circuit U2 is MAX3232IDR.

[0024] Specifically, the contact 1 of the female connector U1 is respectively connected to the 3.3V power supply network 3V3 and the first end of the resistor R1, and the second end of the resistor R1 is connected to the contact 4 of the female connector U1; the contact 2 of the female connector U1 is simultaneously connected to the pin 11 of the integrated circuit U2, the first end of the resistor R2, and the first end of the resistor R4; the contact 3 of the female connector U1 is simultaneously connected to the pin 12 of the integrated circuit U2, the first end of the resistor R3, and the first end of the resistor R5. Pin 1 of the integrated circuit U2 is connected to the first end of capacitor C2, and the second end of capacitor C2 is connected to pin 3 of the integrated circuit U2; pin 2 of the integrated circuit U2 is connected to the first end of capacitor C3; pin 4 of the integrated circuit U2 is connected to the first end of capacitor C4, and the second end of capacitor C4 is connected to pin 5 of the integrated circuit U2; pins 7, 8, 9 and 10 of the integrated circuit U2 are suspended; pin 13 of the integrated circuit U2 is connected to contact 3 of the pin connector U3; pin 14 of the integrated circuit U2 is connected to contact 2 of the pin connector U3; pin 16 of the integrated circuit U2 is simultaneously connected to the first end of capacitor C1 and connected to the 3.3V power supply network 3V3. Contact 1 of the pin connector U3 is connected to the 3.3V power supply network 3V3. Contact 1 of the USB connector USB1 is connected to the 3.3V power network 3V3; Contact 2 of the USB connector USB1 is connected to the second end of the resistor R2 and the second end of the resistor R5 at the same time; Contact 2 of the USB connector USB1 is connected to the second end of the resistor R3 and the second end of the resistor R4 at the same time. Contacts 5 and 6 of the female connector U1 are connected to the ground network GND at the same time. Pin 15 of the integrated circuit U2 is connected to the ground network GND. Contact 4 of the pin connector U3 is connected to the ground network GND. Contacts 4 and 5 of the USB connector USB1 are connected to the ground network GND at the same time. The second end of the capacitor C1, the second end of the capacitor C3, and the second end of the capacitor C5 are connected to the ground network GND at the same time.

[0025] Specifically, the pin spacing of the female connector U1 is 2.0 mm, the model of the integrated circuit U2 is MAX3232IDR, the model of the pin connector U3 is XH2.54 female socket, and the USB1 is a type-A USB male connector.

[0026] Specifically, the capacitance of the capacitors C1, C2, C3, C4, and C5 is 0.1 uF.

[0027] Specifically, the resistance values ​​of the resistors R1 , R2 , R3 , R4 , and R5 are 0Ω.

[0028] When the circuit of the utility model is used to realize the "TTL" to "RS-232" level wired transmission of the serial port, the resistors R1, R4, R5 and the female header U1 in the circuit do not need to be connected to the circuit (the above components do not need to be soldered on the circuit board). At this time, the "TTL" level serial port signal line is connected through the USB connector USB1 (wherein, contact 2 is connected to the RX line, and contact 3 is connected to the TX line), and the DB-9 interface line is connected through the pin connector U3, so that the "TTL" to "RS-232" level wired transmission of the serial port can be realized, thereby effectively improving the serial port wired transmission distance and stability.

[0029] When the circuit of the utility model is used to realize serial wireless transmission, the resistor R2, resistor R3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, integrated circuit U2 and pin connector U3 in the circuit do not need to be connected to the circuit (the above components do not need to be soldered in the circuit board). At this time, the "TTL" level serial signal line is connected through the USB connector USB1 (wherein, contact 2 is connected to the RX line, and contact 3 is connected to the TX line), and the common serial transmission module available on the market (for example: JDY-41, Hummingbird Wireless TR2, etc.) is connected through the female connector U1, and serial wireless transmission can be realized when used in pairs.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A serial interface transmission multiplexing circuit, characterized in that: It includes an integrated circuit U2, capacitors C1-C5, resistors R1-R5, a female connector U1, a pin connector U3, and a USB connector USB1; wherein the model of the integrated circuit U2 is MAX3232IDR; The contact 1 of the female connector U1 is respectively connected to the 3.3V power supply network and the first end of the resistor R1, and the second end of the resistor R1 is connected to the contact 4 of the female connector U1; the contact 2 of the female connector U1 is simultaneously connected to the pin 11 of the integrated circuit U2, the first end of the resistor R2 and the first end of the resistor R4; the contact 3 of the female connector U1 is simultaneously connected to the pin 12 of the integrated circuit U2, the first end of the resistor R3 and the first end of the resistor R5; the contacts 5 and 6 of the female connector U1 are simultaneously connected to the ground network GND; Pin 1 of the integrated circuit U2 is connected to the first end of the capacitor C2, and the second end of the capacitor C2 is connected to pin 3 of the integrated circuit U2; pin 2 of the integrated circuit U2 is connected to the first end of the capacitor C3; pin 4 of the integrated circuit U2 is connected to the first end of the capacitor C4, and the second end of the capacitor C4 is connected to pin 5 of the integrated circuit U2; pins 7, 8, 9 and 10 of the integrated circuit U2 are suspended; pin 13 of the integrated circuit U2 is connected to contact 3 of the pin connector U3; pin 14 of the integrated circuit U2 is connected to contact 2 of the pin connector U3; pin 16 of the integrated circuit U2 is simultaneously connected to the first end of the capacitor C1 and connected to the 3.3V power supply network; pin 15 of the integrated circuit U2 is connected to the ground network GND; the second end of the capacitor C1, the second end of the capacitor C3, and the second end of the capacitor C5 are simultaneously connected to the ground network GND; The contact 1 of the pin connector U3 is connected to the 3.3V power supply network 3V3; the contact 4 of the pin connector U3 is connected to the ground network GND; Contact 1 of the USB connector USB1 is connected to the 3.3V power network 3V3; contact 2 of the USB connector USB1 is simultaneously connected to the second end of resistor R2 and the second end of resistor R5; contact 2 of the USB connector USB1 is simultaneously connected to the second end of resistor R3 and the second end of resistor R4; contacts 4 and 5 of the USB connector USB1 are simultaneously connected to the ground network GND.

2. A serial interface transmission multiplexing circuit according to claim 1, characterized in that: The pin spacing of the female connector U1 is 2.0 mm.

3. The serial interface transmission multiplexing circuit according to claim 1, characterized in that: The model of the pin connector U3 is XH2.54 female socket.

4. The serial interface transmission multiplexing circuit according to claim 1, characterized in that: The USB1 is a type-A USB male connector.

5. The serial interface transmission multiplexing circuit according to claim 1, characterized in that: The capacitance of capacitors C1, C2, C3, C4, and C5 is 0.1uF.

6. The serial interface transmission multiplexing circuit according to claim 1, characterized in that: The resistance values ​​of the resistors R1 , R2 , R3 , R4 , and R5 are 0Ω.

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