Multi-communication interface conversion device

Abstract

The utility model relates to the technical field of communication interface conversion, and discloses a multi-communication interface conversion device. The device comprises a plurality of TTL communication interface modules, an interface conversion module and an RS485 communication interface module, the plurality of TTL communication interface modules are respectively connected with the interface conversion module; and the interface conversion module is also connected with the RS485 communication interface module. According to the utility model, by adding more interfaces, data transmission can be carried out on equipment with a plurality of TTL interfaces at one time, and the problem that the existing product can only carry out data transmission on equipment with one TTL interface is solved, so that a user can carry out one-to-many operation when using the product, and better use experience is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of communication interface conversion, in particular to a multi-communication interface conversion device. Background Art

[0002] Due to the update and development of electronic products, different devices need to communicate with each other, different systems need to communicate with each other, and different products need to communicate with each other. However, each product or device has a different communication method, and it is difficult to unify the communication interface. Therefore, a device is needed to convert the communication interface, to interconnect the signals of the two communication interfaces, and to realize the mutual connection between the two different products. It is necessary to know that the communication interface refers to the interface between the central processing unit and the standard communication subsystem. For example, RS485 and TTL are two types of communication interfaces.

[0003] TTL stands for transistor-transistor logic level. TTL level signal stipulates that +5V is equivalent to logic "1" and 0V is equivalent to logic "0" (when binary is used to represent data). This data communication and level specification method is called TTL (transistor-transistor logic level) signal system. RS485 is a standard that defines the electrical characteristics of drivers and receivers in balanced digital multi-point systems. The standard is defined by the Telecommunications Industry Association and the Electronic Industry Alliance. Digital communication networks using this standard can effectively transmit signals over long distances and in environments with high electronic noise.

[0004] TTL and RS485 refer to different interface standards. These two different interface standards cannot communicate directly and require a conversion device.

[0005] At present, the conversion devices are all one-to-one, that is, one TTL to one RS485. This conversion method is the most common method at this stage. Although the one-to-one conversion method solves the problem that the two interface standards of TTL and RS485 cannot communicate directly, when the TTL signals of multiple devices are connected to the RS485 signal at the same time, this one-to-one conversion method cannot solve this problem. In addition, the converters of one TTL to one RS485 on the market are simple in design, have no protection function, and have no anti-interference function. If the signal line is slightly interfered by the outside world, errors will occur in the reception of the signal. Utility Model Content

[0006] In view of the above-mentioned deficiencies in the prior art, the utility model provides a multi-communication interface conversion device.

[0007] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is:

[0008] A multi-communication interface conversion device, comprising:

[0009] Multiple TTL communication interface modules, interface conversion modules and RS485 communication interface modules;

[0010] A plurality of TTL communication interface modules are respectively connected to the interface conversion modules;

[0011] The interface conversion module is also connected to the RS485 communication interface module.

[0012] Preferably, the TTL communication interface module specifically includes:

[0013] A TTL communication interface terminal, a first transient suppression unit and a photoelectric coupling unit connected in sequence;

[0014] The photoelectric coupler is connected to the interface conversion module.

[0015] Preferably, the first transient suppression unit specifically includes:

[0016] a first TVS diode and a second TVS diode;

[0017] The positive electrode of the first transient suppression diode is grounded, and the negative electrode of the first transient suppression diode is connected to the first signal terminal of the TTL communication interface terminal;

[0018] The anode of the second transient voltage suppression diode is grounded, and the cathode of the second transient voltage suppression diode is connected to the second signal terminal of the TTL communication interface terminal.

[0019] Preferably, the photoelectric coupling unit specifically includes:

[0020] a first photocoupler and a second photocoupler;

[0021] Pin 1 of the first photoelectric coupler is connected to the power supply end through a first resistor, pin 2 of the first photoelectric coupler is connected to the signal output pin of the interface conversion module, pin 3 of the first photoelectric coupler is grounded, and pin 4 of the first photoelectric coupler is connected to the first signal end of the TTL communication interface end and connected to the power supply end through a second resistor;

[0022] Pin 1 of the second photoelectric coupler is connected to the power supply end through the third resistor and is connected to the collector of the first transistor, the base of the first transistor is connected to the second signal end of the TTL communication interface end through the fourth resistor, and is connected to the power supply end through the fifth resistor, the emitter of the first transistor and pin 2 of the second photoelectric coupler are grounded together, pin 3 of the second photoelectric coupler is grounded, and pin 4 of the second photoelectric coupler is connected to the signal input pin of the interface conversion module.

[0023] Preferably, the interface conversion module specifically includes:

[0024] Interface conversion chip;

[0025] Pin 1 of the interface conversion chip is connected to pin 2 of the first photoelectric coupler, connected to the power supply end through a sixth resistor, and grounded through a first capacitor; Pin 2 of the interface conversion chip is connected to pin 3 of the interface conversion chip, and connected to the power supply end through a seventh resistor; Pin 4 of the interface conversion chip is connected to pin 4 of the second photoelectric coupler, connected to the power supply end through an eighth resistor, and grounded through a second capacitor; Pin 5 of the interface conversion chip is grounded; Pin 6 and Pin 7 of the interface conversion chip are respectively connected to the first signal end and the second signal end of the RS485 communication interface module; Pin 8 of the interface conversion chip is connected to the power supply end, and grounded through a third capacitor.

[0026] Preferably, the RS485 communication interface module specifically includes:

[0027] RS485 communication interface terminal and a second transient suppression unit;

[0028] The second transient suppression unit is connected to the first signal terminal and the second signal terminal of the RS485 communication interface terminal.

[0029] Preferably, the second transient suppression unit specifically includes:

[0030] a third TVS diode, a fourth TVS diode, and a fifth TVS diode;

[0031] Two ends of a third transient suppression diode are respectively connected to a first signal end and a second signal end of the RS485 communication interface end;

[0032] One end of the fourth transient suppression diode is connected to the first signal end of the RS485 communication interface end, and the other end of the fourth transient suppression diode is grounded;

[0033] One end of the fifth transient voltage suppression diode is connected to the second signal end of the RS485 communication interface end, and the other end of the fifth transient voltage suppression diode is grounded.

[0034] The utility model has the following beneficial effects:

[0035] (1) The utility model can transmit data to multiple TTL interface devices at one time by adding more interfaces, thus solving the problem that existing products can only transmit data to one TTL interface device, thereby allowing users to perform one-to-many operations when using the product and having a better user experience.

[0036] (2) The utility model adopts a signal isolation method and adds a photoelectric coupler to isolate the signal. Since the photoelectric coupler is a unidirectional transmission, the unidirectional transmission of the signal can be realized, so that the input end and the output end are completely electrically isolated, the output signal has no effect on the input end, the anti-interference ability is strong, and the operation is stable. Since the photoelectric coupler is photoelectric, it has a long service life and gets rid of the defect of the mechanical contact of the relay with a certain number of closures. It solves the problem that the existing products will affect the signal communication when encountering interference due to the lack of signal isolation. Therefore, by adding signal isolation, this embodiment can make the product signal communication more stable.

[0037] (3) In order to solve the problem that the RS485 interface is easily affected by static electricity shock, cable discharge events and lightning-induced transient surge pulses, the utility model uses transient suppression diodes at the RS485 end and the TTL end to protect the RS485 signal line and the TTL signal line. However, existing products have no protection, and when encountering static electricity or lightning surges, the chip or the equipment in communication will be damaged. Therefore, this embodiment adds signal protection, which can make the product safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a multi-communication interface conversion device;

[0039] Figure 2 The present invention is a circuit schematic diagram of a multi-communication interface conversion device. DETAILED DESCRIPTION

[0040] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0041] like Figure 1 As shown, the embodiment of the utility model provides a multi-communication interface conversion device, comprising:

[0042] Multiple TTL communication interface modules, interface conversion modules and RS485 communication interface modules;

[0043] A plurality of TTL communication interface modules are respectively connected to the interface conversion modules;

[0044] The interface conversion module is also connected to the RS485 communication interface module.

[0045] This embodiment adds more interfaces to transmit data to multiple TTL interface devices at one time, solving the problem that existing products can only transmit data to one TTL interface device, thereby allowing users to perform one-to-many operations when using this product and having a better user experience.

[0046] In an optional embodiment of the present utility model, the TTL communication interface module specifically includes:

[0047] A TTL communication interface terminal, a first transient suppression unit and a photoelectric coupling unit connected in sequence;

[0048] The photoelectric coupler is connected to the interface conversion module.

[0049] Wherein, the first transient suppression unit specifically includes:

[0050] a first TVS diode and a second TVS diode;

[0051] The positive electrode of the first transient suppression diode is grounded, and the negative electrode of the first transient suppression diode is connected to the first signal terminal of the TTL communication interface terminal;

[0052] The anode of the second transient voltage suppression diode is grounded, and the cathode of the second transient voltage suppression diode is connected to the second signal terminal of the TTL communication interface terminal.

[0053] The photoelectric coupling unit specifically includes:

[0054] a first photocoupler and a second photocoupler;

[0055] Pin 1 of the first photoelectric coupler is connected to the power supply end through a first resistor, pin 2 of the first photoelectric coupler is connected to the signal output pin of the interface conversion module, pin 3 of the first photoelectric coupler is grounded, and pin 4 of the first photoelectric coupler is connected to the first signal end of the TTL communication interface end and connected to the power supply end through a second resistor;

[0056] Pin 1 of the second photoelectric coupler is connected to the power supply end through the third resistor and is connected to the collector of the first transistor, the base of the first transistor is connected to the second signal end of the TTL communication interface end through the fourth resistor, and is connected to the power supply end through the fifth resistor, the emitter of the first transistor and pin 2 of the second photoelectric coupler are grounded together, pin 3 of the second photoelectric coupler is grounded, and pin 4 of the second photoelectric coupler is connected to the signal input pin of the interface conversion module.

[0057] This embodiment adopts a signal isolation method and adds a photoelectric coupler to isolate the signal. Since the photoelectric coupler is unidirectional, the unidirectional transmission of the signal can be realized, so that the input end and the output end are completely electrically isolated, the output signal has no effect on the input end, the anti-interference ability is strong, and the operation is stable. Since the photoelectric coupler is photoelectric, it has a long service life and gets rid of the defect of the mechanical contacts of the relay with a certain number of closures. It solves the problem that the existing products will affect the signal communication when encountering interference due to the lack of signal isolation. Therefore, this embodiment can make the product signal communication more stable by adding signal isolation.

[0058] In an optional embodiment of the present utility model, the interface conversion module specifically includes:

[0059] Interface conversion chip;

[0060] Pin 1 of the interface conversion chip is connected to pin 2 of the first photoelectric coupler, connected to the power supply end through a sixth resistor, and grounded through a first capacitor; Pin 2 of the interface conversion chip is connected to pin 3 of the interface conversion chip, and connected to the power supply end through a seventh resistor; Pin 4 of the interface conversion chip is connected to pin 4 of the second photoelectric coupler, connected to the power supply end through an eighth resistor, and grounded through a second capacitor; Pin 5 of the interface conversion chip is grounded; Pin 6 and Pin 7 of the interface conversion chip are respectively connected to the first signal end and the second signal end of the RS485 communication interface module; Pin 8 of the interface conversion chip is connected to the power supply end, and grounded through a third capacitor.

[0061] This embodiment converts TTL signals and RS485 signals to each other through an interface conversion chip, thereby realizing two-way communication between TTL and RS485.

[0062] In an optional embodiment of the present utility model, the RS485 communication interface module specifically includes:

[0063] RS485 communication interface terminal and a second transient suppression unit;

[0064] The second transient suppression unit is connected to the first signal terminal and the second signal terminal of the RS485 communication interface terminal.

[0065] Preferably, the second transient suppression unit specifically includes:

[0066] a third TVS diode, a fourth TVS diode, and a fifth TVS diode;

[0067] Two ends of a third transient suppression diode are respectively connected to a first signal end and a second signal end of the RS485 communication interface end;

[0068] One end of the fourth transient suppression diode is connected to the first signal end of the RS485 communication interface end, and the other end of the fourth transient suppression diode is grounded;

[0069] One end of the fifth transient voltage suppression diode is connected to the second signal end of the RS485 communication interface end, and the other end of the fifth transient voltage suppression diode is grounded.

[0070] In order to solve the problem that the RS485 interface is easily affected by static electricity shock, cable discharge events and transient surge pulses caused by lightning, this embodiment uses transient suppression diodes at the RS485 end and the TTL end to protect the RS485 signal line and the TTL signal line. However, existing products have no protection, and encountering static electricity or lightning surges will damage the chip or the equipment in communication. Therefore, this embodiment adds signal protection, which can make this product safer to use.

[0071] like Figure 2 The figure shows a circuit schematic diagram of a multi-communication interface conversion device, which includes 5 TTL communication interface modules, 5 interface conversion modules and 1 RS485 communication interface module.

[0072] In this embodiment, the circuit structures of the five TTL communication interface modules and the five interface conversion modules are the same. Taking one of the TTL communication interface modules and the corresponding interface conversion module as an example, pin 1 of the TTL communication interface terminal J6 is connected to the 5V power supply terminal, pin 2 and pin 3 of the TTL communication interface terminal J6 are respectively connected to the first photocoupler U6 and the second photocoupler U7, and pin 4 of the TTL communication interface terminal J6 is grounded.

[0073] The anode of the first transient suppression diode D9 is grounded, and the cathode of the first transient suppression diode D9 is connected to the pin 2 of the TTL communication interface terminal.

[0074] The anode of the second transient suppression diode D10 is grounded, and the cathode of the first transient suppression diode D9 is connected to the pin 3 of the TTL communication interface terminal.

[0075] Pin 1 of the first photocoupler U6 is connected to the 5V power supply terminal through a resistor R1, pin 2 of the first photocoupler is connected to the signal output pin of the interface conversion module, pin 3 of the first photocoupler U6 is grounded, pin 4 of the first photocoupler U6 is connected to pin 2 of the TTL communication interface terminal, and connected to the 5V power supply terminal through a resistor R4;

[0076] Pin 1 of the second photocoupler U7 is connected to the 5V power supply end through the resistor R3, and is connected to the collector of the first transistor Q1. The base of the first transistor Q1 is connected to the pin 3 of the TTL communication interface end through the resistor R4, and is connected to the 5V power supply end through the resistor R2. The emitter of the first transistor Q1 and the pin 2 of the second photocoupler U7 are grounded together, the pin 3 of the second photocoupler U7 is grounded, and the pin 4 of the second photocoupler U7 is connected to the signal input pin of the interface conversion module.

[0077] Pin 1 of the interface conversion chip U5 is connected to pin 2 of the first photoelectric coupler U6, and is connected to the 5V power supply end through resistor R8, and is also grounded through capacitor C7; Pin 2 of the interface conversion chip U5 is connected to pin 3, and is connected to the 5V power supply end through resistor R7; Pin 4 of the interface conversion chip U5 is connected to pin 4 of the second photoelectric coupler U7, and is connected to the 5V power supply end through resistor R6, and is also grounded through capacitor C8; Pin 5 of the interface conversion chip U7 is grounded; Pin 6 and Pin 7 of the interface conversion chip are respectively connected to the first signal end and the second signal end of the RS485 communication interface module; Pin 8 of the interface conversion chip U7 is connected to the 5V power supply end, and is grounded through capacitor C6.

[0078] In this embodiment, the circuit structures of the various TTL communication interface modules and interface conversion modules are the same, so the specific circuit structures of the remaining TTL communication interface modules and interface conversion modules are not described in detail here.

[0079] Pin 1 of the RS485 communication interface terminal J1 is grounded, and pin 2 and pin 3 of the RS485 communication interface terminal J1 are respectively connected to pin 6 and pin 7 of the interface conversion chip U7.

[0080] Two ends of the third transient suppression diode DR1 are respectively connected to pin 2 and pin 3 of the RS485 communication interface end;

[0081] One end of the fourth transient suppression diode DR2 is connected to the pin 3 of the RS485 communication interface end, and the other end of the fourth transient suppression diode DR2 is grounded;

[0082] One end of the fifth transient suppression diode DR3 is connected to the pin 2 of the RS485 communication interface terminal, and the other end of the fifth transient suppression diode DR3 is grounded.

[0083] The working principle of a multi-communication interface conversion device provided in this embodiment is as follows:

[0084] The RS485 bus is connected to the RS485 interface of the device, and the TTL signal line is connected to the TTL interface. There are 5 TTL interfaces, so 5 TTL interface devices can be connected, thus realizing the communication between the RS485 interface device and the 5 TTL interface devices.

[0085] The signal is a two-way communication, from the RS485 end to the TTL end, and from the TTL end to the RS485 end.

[0086] The signal enters from the RS485 interface, passes through the transient suppression diode, uses the transient suppression diode to protect the interface conversion chip, and then goes to the interface conversion chip to convert the RS485 signal into a TTL signal. Then it passes through the photoelectric coupler, uses the photoelectric coupler to isolate interference, and then goes to the transient suppression diode for equipment protection, and then goes to the TTL interface to output the signal.

[0087] The signal enters from the TTL interface, passes through the transient suppression diode, uses the transient suppression diode to protect the device, then goes to the photoelectric coupler, uses the photoelectric coupler to isolate interference, then goes to the interface conversion chip to convert the TTL signal into an RS485 signal, then goes to the transient suppression diode to protect the device, and finally goes to the RS485 interface to output the signal.

[0088] This realizes the two-way communication process of signals.

[0089] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

[0090] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical inspirations disclosed in the present invention without departing from the essence of the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A multi-communication interface conversion device, characterized in that: include: Multiple TTL communication interface modules and interface conversion modules, and an RS485 communication interface module; A plurality of TTL communication interface modules are respectively connected to corresponding interface conversion modules; A plurality of interface conversion modules are all connected to the RS485 communication interface module.

2. A multi-communication interface conversion device according to claim 1, characterized in that: The TTL communication interface module specifically includes: A TTL communication interface terminal, a first transient suppression unit and a photoelectric coupling unit connected in sequence; The photoelectric coupler is connected to the interface conversion module.

3. A multi-communication interface conversion device according to claim 2, characterized in that: The first transient suppression unit specifically includes: a first TVS diode and a second TVS diode; The positive electrode of the first transient suppression diode is grounded, and the negative electrode of the first transient suppression diode is connected to the first signal terminal of the TTL communication interface terminal; The anode of the second transient voltage suppression diode is grounded, and the cathode of the second transient voltage suppression diode is connected to the second signal terminal of the TTL communication interface terminal.

4. A multi-communication interface conversion device according to claim 3, characterized in that: The photoelectric coupling unit specifically includes: a first photocoupler and a second photocoupler; Pin 1 of the first photoelectric coupler is connected to the power supply end through a first resistor, pin 2 of the first photoelectric coupler is connected to the signal output pin of the interface conversion module, pin 3 of the first photoelectric coupler is grounded, and pin 4 of the first photoelectric coupler is connected to the first signal end of the TTL communication interface end and connected to the power supply end through a second resistor; Pin 1 of the second photoelectric coupler is connected to the power supply end through the third resistor and is connected to the collector of the first transistor, the base of the first transistor is connected to the second signal end of the TTL communication interface end through the fourth resistor, and is connected to the power supply end through the fifth resistor, the emitter of the first transistor and pin 2 of the second photoelectric coupler are grounded together, pin 3 of the second photoelectric coupler is grounded, and pin 4 of the second photoelectric coupler is connected to the signal input pin of the interface conversion module.

5. A multi-communication interface conversion device according to claim 4, characterized in that: The interface conversion module specifically includes: Interface conversion chip; Pin 1 of the interface conversion chip is connected to pin 2 of the first photoelectric coupler, connected to the power supply end through a sixth resistor, and grounded through a first capacitor; Pin 2 of the interface conversion chip is connected to pin 3 of the interface conversion chip, and connected to the power supply end through a seventh resistor; Pin 4 of the interface conversion chip is connected to pin 4 of the second photoelectric coupler, connected to the power supply end through an eighth resistor, and grounded through a second capacitor; Pin 5 of the interface conversion chip is grounded; Pin 6 and Pin 7 of the interface conversion chip are respectively connected to the first signal end and the second signal end of the RS485 communication interface module; Pin 8 of the interface conversion chip is connected to the power supply end, and grounded through a third capacitor.

6. A multi-communication interface conversion device according to claim 5, characterized in that: The RS485 communication interface module specifically includes: RS485 communication interface terminal and a second transient suppression unit; The second transient suppression unit is connected to the first signal terminal and the second signal terminal of the RS485 communication interface terminal.

7. A multi-communication interface conversion device according to claim 6, characterized in that: The second transient suppression unit specifically includes: a third TVS diode, a fourth TVS diode, and a fifth TVS diode; Two ends of a third transient suppression diode are respectively connected to a first signal end and a second signal end of the RS485 communication interface end; One end of the fourth transient suppression diode is connected to the first signal end of the RS485 communication interface end, and the other end of the fourth transient suppression diode is grounded; One end of the fifth transient voltage suppression diode is connected to the second signal end of the RS485 communication interface end, and the other end of the fifth transient voltage suppression diode is grounded.

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