CN213122969U - Serial port communication circuit - Google Patents
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- CN213122969U CN213122969U CN202022122889.4U CN202022122889U CN213122969U CN 213122969 U CN213122969 U CN 213122969U CN 202022122889 U CN202022122889 U CN 202022122889U CN 213122969 U CN213122969 U CN 213122969U
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Abstract
The utility model discloses a serial port communication circuit. The serial port communication circuit includes: a first master control module; the second main control module is used for carrying out data transmission with the first main control module; one end of the output control module is electrically connected with the first main control module, and the other end of the output control module is electrically connected with the second main control module; the communication mode selection module is electrically connected with the other end of the output control module and is used for selecting a communication mode of data transmission; the output control module is used for controlling the signal of data transmission according to the communication mode. According to the serial port communication control method and device, the communication mode of data transmission is selected through the communication mode selection module, the signals of the data transmission of the first main control module and the data transmission of the second main control module are controlled through the output control module, so that the communication requirements of different communication modes are met, different communication modules are supported on the same circuit, and the efficiency of serial port communication and the applicability of the serial port communication circuit are improved.
Description
Technical Field
The utility model relates to a serial communication field especially relates to a serial communication circuit.
Background
At present, the application of human-computer interfaces is more and more extensive. In the related human-computer interface device, interactive communication is performed with a special controller such as a PLC through a serial port, for example, interactive communication is performed through an RS232 serial port or a TTL serial port.
However, in the above communication mode, the communication requirements of the RS232 serial port and the TTL serial port are different. In practical application, different communication requirements can only be met by replacing the RS232 serial port communication circuit or the TTL serial port communication circuit, so that the serial port communication efficiency is influenced, and certain limitation is caused to the use of the serial port communication circuit.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a serial communication circuit can select communication mode to serial communication circuit's suitability is provided.
According to the utility model discloses a serial communication circuit, include: a first master control module; the second main control module is used for carrying out data transmission with the first main control module; one end of the output control module is electrically connected with the first main control module, and the other end of the output control module is electrically connected with the second main control module; the communication mode selection module is electrically connected with the other end of the output control module and is used for selecting the communication mode of the data transmission; wherein the output control module is used for controlling the data transmission signal according to the communication mode.
According to the utility model discloses serial communication circuit has following beneficial effect at least: the serial port communication circuit that this application provided selects data transmission's communication mode through communication mode selection module, controls first host system and second host system's data transmission's signal through output control module to satisfy different communication mode's communication demand, thereby realize supporting different communication module simultaneously on same circuit, with the suitability that improves serial communication's efficiency and serial port communication circuit.
According to some embodiments of the invention, the output control module comprises: one end of the first output controller is electrically connected with the first main control module, and the other end of the first output controller is electrically connected with the communication selection module and is used for controlling the data transmission signals of the first main control module according to the communication mode; and one end of the second output controller is electrically connected with the communication mode selection module and the other end of the first output controller respectively, and the other end of the second output controller is electrically connected with the second main control module and used for controlling the data transmission signals of the second main control module according to the communication mode.
According to some embodiments of the present invention, the output control module further comprises: one end of the first capacitor is electrically connected with the first output controller, and the other end of the first capacitor is grounded; and one end of the second capacitor is electrically connected with the second output controller, and the other end of the second capacitor is grounded.
According to some embodiments of the present invention, further comprising: the first power supply module is electrically connected with the other end of the first output controller and one end of the second output controller respectively and used for providing a first power supply; the communication mode selection module comprises: and one end of the switch is respectively electrically connected with the other end of the first output controller, one end of the second output controller and the first power supply module, and the other end of the switch is grounded.
According to some embodiments of the invention, the communication mode selection module further comprises: one end of the first resistor is electrically connected with the first power supply module, and the other end of the first resistor is electrically connected with one end of the switch.
According to some embodiments of the present invention, further comprising: the level conversion module is electrically connected with the other end of the first output controller and the other end of the second output controller respectively and used for converting the level of the data transmission according to the communication mode; and the second power supply module is electrically connected with the level conversion module and is used for providing a second power supply.
According to some embodiments of the invention, the level shift module comprises: a first level shifting module, the first level shifting module comprising: one end of the second resistor is electrically connected with the second power supply module, the other end of the second resistor is electrically connected with the anode of the first diode, and the cathode of the first diode is electrically connected with the other end of the first output controller; a second level shifting module, the second level shifting module comprising: one end of the third resistor is electrically connected with the second power supply module, the other end of the third resistor is electrically connected with the anode of the second diode, and the anode of the second diode is electrically connected with the other end of the second output controller.
According to some embodiments of the present invention, further comprising: and the current limiting module is respectively electrically connected with the level conversion module, the first main control module and the second main control module and is used for carrying out current limiting operation on the data transmission signals.
According to some embodiments of the invention, the current limiting module comprises: one end of the fourth resistor is electrically connected with the anode of the first diode, and the other end of the fourth resistor is electrically connected with the second main control module; one end of the fifth resistor is electrically connected with the cathode of the second diode, and the other end of the fifth resistor is electrically connected with the second main control module.
According to some embodiments of the invention, the first output controller and the second output controller are both 74lvc1g 57.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention will be further described with reference to the following drawings and examples, in which:
fig. 1 is a block diagram of a serial communication circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a serial communication circuit according to another embodiment of the present invention;
fig. 3 is a schematic circuit diagram of another specific embodiment of the serial communication circuit of the present invention.
Reference numerals:
the main control system comprises a first main control module 100, a second main control module 200, a communication mode selection module 300, an output control module 400, a first output controller 410, a second output controller 420, a first power supply module 500 and a second power supply module 600.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It should be noted that, in the serial port communication circuit provided in the present application, the first main control module 100 and the second main control module 200 may perform half-duplex communication, and full-duplex communication, and the embodiment of the present application is not particularly limited.
Referring to fig. 1, in some embodiments, the serial communication circuit includes: a first main control module 100, a second main control module 200, a communication mode selection module 300, and an output control module 400. One end of the output control module 400 is electrically connected to the first main control module 100, and the other end of the output control module 400 is electrically connected to the second main control module 200 and the communication mode selection module 300, respectively. The first main control module 100 and the second main control module 200 are configured to perform data transmission interaction, the communication mode selection module 300 is configured to select a communication module for data transmission, and the output control module 400 is configured to control a signal for data transmission according to a communication mode. Specifically, the first main control module 100 includes an upper computer-human-computer interaction system, for example: MCU; the second master control module 200 includes lower computer control systems, such as: PLC and other special controllers. The communication mode selection module 300 is used for selecting a data transmission communication mode between the MCU and the PLC, for example: TLL serial port communication, RS232 serial port communication and the like. The output control module 400 controls the data transmission signals according to the communication mode to meet the communication requirement that the signals of the TX terminal and the RX terminal of TTL serial port communication do not need to be inverted and the signals of the TX terminal and the RX terminal of RS232 serial port communication need to be inverted.
The serial port communication circuit provided by the application selects the communication mode of data transmission through the communication mode selection module 300, controls the signal of data transmission of the first main control module 100 and the second main control module 200 through the output control module 400, and meets the communication requirements of different communication modes, so that different communication modules can be simultaneously supported on the same circuit, and the efficiency of serial port communication and the applicability of the serial port communication circuit are improved.
Referring to fig. 2, in some embodiments, the output control module 400 includes: a first output controller 410 and a second output controller 420. One end of the first output controller 410 is electrically connected to the first main control module 100, and the other end of the first output controller 410 is electrically connected to the second main control module 200; one end of the second output controller 420 is electrically connected to the first main control module 100, and the other end of the second output controller 420 is electrically connected to the second main control module 200. The first output controller 410 is used for controlling signals of data transmission of the first master module 100 according to the communication mode, and the second output controller 420 is used for controlling signals of data transmission of the second master module 200 according to the communication mode. Specifically, when the communication mode selection module 300 selects TTL serial communication, the first output controller 410 controls the signal of the PLC _ RXD port to follow the signal of the MCU _ TXD port of the first main control module 100, and the second output controller 420 controls the signal of the MCU _ RXD port to follow the signal of the PLC _ TXD port of the second main control module 200, so as to meet the requirements of the TTL serial communication. When the communication mode selection module 300 selects RS232 serial port communication, the first output controller 410 controls the signal of the PLC _ RXD port to be in phase opposition to the signal of the MCU _ TXD port of the first master control module 100, and the second output controller 420 controls the signal of the MCU _ RXD port to be in phase opposition to the signal of the PLC _ TXD port of the second master control module 200, so as to meet the requirement of RS232 serial port communication.
Referring to fig. 3, in some embodiments, the first output controller 410 and the second output controller 420 are both model numbers 74lvc1g57, i.e., both the first output controller 410 and the second output controller 420 are logic gate control elements. Specifically, the MCU _ TXD port of the first master control module 100 is electrically connected to the B port and the a port of the first output controller 410, the communication mode selection module 300 is electrically connected to the C port of the first output controller 410, and the Y port of the first output controller 410 is electrically connected to the PLC _ RXD port of the second master control module. The PLC _ TXD port of the second master control module 200 is electrically connected to the B port and the a port of the second output controller 420, respectively, the communication mode selection module 300 is electrically connected to the C port of the second output controller 420, and the Y port of the second output controller 420 is electrically connected to the MCU _ RXD port of the first master control module 100. When the communication mode selection module 300 controls the C port of the first output controller 410 and the C port of the second output controller 420 to both receive high level signals, the first main control module 100 and the second main control module 200 perform data transmission through TTL serial port communication, at this time, the Y port signal of the first output controller 410 follows the MCU _ TXD port signal of the first main control module 100, and the Y port signal of the second output controller 420 follows the PLC _ TXD port signal of the second main control module 200, so as to meet the TTL serial port communication requirement. When the communication mode selection module 300 controls the C port of the first output controller 410 and the C port of the second output controller 420 to both receive a low level, the first main control module 100 and the second main control module 200 perform data transmission through RS232 serial port communication, at this time, a Y port signal of the first output controller 410 is inverted to an MCU _ TXD port signal of the first main control module 100, and a Y port signal of the second output controller 420 is inverted to a PLC _ TXD port signal of the second main control module 200, so as to meet the RS232 serial port communication requirement. It is understood that logic gate control elements that meet the control requirements described above are intended to fall within the scope of the present application.
In some embodiments, the output control module 400 further comprises: a first capacitor C1 and a second capacitor C2. One end of the first capacitor C1 is electrically connected with the first output controller 410, and the other end of the first capacitor C1 is grounded; one end of the second capacitor C2 is electrically connected to the second output controller 420, and the other end of the second capacitor C2 is grounded. Specifically, one end of the first capacitor C1 is electrically connected to the VCC port of the first output controller 410, and one end of the second capacitor C2 is electrically connected to the VCC port of the second output controller 420. The first capacitor C1 and the second capacitor C2 are used for decoupling the power bypass to ensure stable operation of the first output controller 410 and the second output controller 420. In some embodiments, the first capacitor C1 and the second capacitor C2 may each be selected to have a capacitance of 0.1 μ F.
In some embodiments, the serial communication circuit further comprises: the first power supply module 500, the communication mode selection module 300 includes: switch JP 1. The first power supply module 500 is electrically connected to the other end of the first output controller 410 and one end of the second output controller 420, respectively, and is configured to provide a first power supply to the first output controller 410 and the second output controller 420. One end of the switch JP1 is electrically connected to the other end of the first output controller 410, one end of the second output controller 420, and the first power supply module 500, respectively, and the other end of the switch JP1 is grounded. Specifically, the first power supply is 3.3V. When the switch JP1 is turned off, the C port of the first output controller 410 and the C port of the second output controller 420 both receive a 3.3V high-level signal, and at this time, the first main control module 100 and the second main control module 200 perform data transmission through TTL serial port communication; when the switch JP1 is turned on, the C port of the first output controller 410 and the C port of the second output controller 420 are both connected to ground, and at this time, the first main control module 100 and the second main control module 200 perform data transmission through RS232 serial port communication. In some embodiments, the switch JP1 is a dial switch, when the dial is dialed to the OFF terminal, the communication mode is selected to be TTL serial communication, and the first output controller 410 and the second output controller 420 are both connected to the high level of 3.3V; when the dial is dialed to the ON terminal, the communication mode is selected as RS232 serial communication, and the first output controller 410 and the second output controller 420 are both connected to the ground at a low level.
In some embodiments, the communication mode selection module 300 further comprises: one end of the first resistor R1, one end of the first resistor R1 is electrically connected to the first power supply module 500, and the other end of the first resistor R1 is electrically connected to one end of the switch JP 1. Specifically, the other end of the first resistor R1 is electrically connected to one end of the switch JP1, the C port of the first output controller 410, and the C port of the second output controller 420, respectively, and the first resistor R1 is used for current limiting operation of the first power supply.
In some embodiments, the serial communication circuit further comprises: a second power supply module 600 and a level conversion module. The second power supply module 600 is electrically connected to the level shifter module for providing a second power supply. The level conversion module is electrically connected to the other end of the first output controller 410 and the other end of the second output controller 420, respectively, and is configured to convert a level of data transmission according to a communication mode. Specifically, the second power supply module 600 is used to provide a voltage of 5V. The level shifter module is electrically connected to the Y port of the first output controller 410 and the B port of the second output controller 420, respectively. The level conversion module converts the high level of the MCU _ TXD port signal converted by the first output controller 410 into 5V, and converts the high level of the PLC _ TXD port signal converted by the second output controller 420 into 5V, so as to realize 5V TTL serial port communication. It can be understood that the low level converted by the first output controller 410 and the second output controller 420 is still a low level signal after passing through the level conversion module.
In some embodiments, the level conversion module comprises: the device comprises a first level conversion module and a second level conversion module. The first level shifter module is electrically connected to a Y port of the first output controller 410, and the second level shifter module is electrically connected to a B port of the second output controller 420. Wherein, the first level shift module includes: a second resistor R2 and a first diode D1, the second level shift module includes: a third resistor R3 and a second diode D2. One end of the second resistor R2 is electrically connected to the second power supply module 600, the other end of the second resistor R2 is electrically connected to the anode of the first diode D1, and the cathode of the first diode D1 is electrically connected to the Y port of the first output controller 410. One end of the third resistor R3 is electrically connected to the second power supply module 600, the other end of the third resistor R3 is electrically connected to the anode of the second diode D2, and the anode of the second diode D2 is also electrically connected to the B port of the second output controller 420. Specifically, the second resistor R2 and the third resistor R3 can be resistors with a resistance of 4.7K Ω, the first diode D1 and the second diode D2 are schottky diodes, the first diode D1 can be a model number LRB751V-40T1G, and the second diode D2 can be a model number LRB751V-40T 1G.
In some embodiments, the serial communication circuit further comprises: and a current limiting module. The current limiting module is electrically connected to the level conversion module, the first main control module 100 and the second main control module 200, and is configured to perform a current limiting operation on a data transmission signal. In some specific embodiments, the current limiting module comprises: a fourth resistor R4 and a fifth resistor R5. One end of the fourth resistor R4 is electrically connected to the anode of the first diode D1, and the other end of the fourth resistor R4 is electrically connected to the second master control module 200; one end of the fifth resistor R5 is electrically connected to the cathode of the second diode D2, and the other end of the fifth resistor R5 is electrically connected to the second master module 200. Specifically, the fourth resistor R4 and the fifth resistor R5 are respectively connected in series to the data transmission branches of the PLC _ RXD port and the MCU _ RXD port, and limit the high-level signal for data transmission, thereby preventing the serial communication circuit from being damaged due to excessive current. In some embodiments, the fourth resistor R4 and the fifth resistor R5 may each be a 200 Ω 1206 chip resistor.
In a specific embodiment, when the dial switch is turned to the OFF terminal, the serial port communication circuit is in a TTL serial port communication mode, at this time, the Y port signal of the first output controller 410 follows the MCU _ TXD port signal of the first master module 100, the Y port signal of the second output controller 420 follows the PLC _ TXD port signal of the second master module 200, that is, the PLC _ RXD port signal of the second master module 200 is in phase with the MCU _ TXD port signal of the first master module 100, and the MCU _ RXD port signal of the first master module 100 is in phase with the PLC _ TXD port signal of the second master module 200, so as to meet the TLL serial port communication requirement. When the dial switch is turned to the ON terminal, the serial communication circuit is in an RS232 serial communication mode, at this time, a Y port signal of the first output controller 410 is inverted to an MCU _ TXD port signal of the first master module 100, a Y port signal of the second output controller 420 is inverted to a PLC _ TXD port signal of the second master module 200, that is, a PLC _ RXD port signal of the second master module 200 is inverted to an MCU _ TXD port signal of the first master module 100, and an MCU _ RXD port signal of the first master module 100 is inverted to a PLC _ TXD port signal of the second master module 200, so that the requirement of the inversion of the TX terminal and the RX terminal of RS232 serial communication is met.
The serial port communication circuit provided by the application selects the circuit to be in TLL serial port communication mode or RS232 serial port communication mode through the communication mode selection module 300 to improve the applicability of the serial port communication circuit and reduce the cost of the serial port communication circuit. The data transmission level in the TLL serial port communication mode is converted into 5V voltage through the level conversion module, and therefore the requirement for 5V TLL serial port communication is met.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (10)
1. Serial port communication circuit, its characterized in that includes:
a first master control module;
the second main control module is used for carrying out data transmission with the first main control module;
one end of the output control module is electrically connected with the first main control module, and the other end of the output control module is electrically connected with the second main control module;
the communication mode selection module is electrically connected with the other end of the output control module and is used for selecting the communication mode of the data transmission;
wherein the output control module is used for controlling the data transmission signal according to the communication mode.
2. The serial port communication circuit according to claim 1, wherein the output control module comprises:
one end of the first output controller is electrically connected with the first main control module, and the other end of the first output controller is electrically connected with the communication mode selection module and is used for controlling the data transmission signals of the first main control module according to the communication mode;
and one end of the second output controller is electrically connected with the communication mode selection module and the other end of the first output controller respectively, and the other end of the second output controller is electrically connected with the second main control module and used for controlling the data transmission signals of the second main control module according to the communication mode.
3. The serial port communication circuit according to claim 2, wherein the output control module further comprises:
one end of the first capacitor is electrically connected with the first output controller, and the other end of the first capacitor is grounded;
and one end of the second capacitor is electrically connected with the second output controller, and the other end of the second capacitor is grounded.
4. The serial communication circuit according to claim 3, further comprising:
the first power supply module is electrically connected with the other end of the first output controller and one end of the second output controller respectively and used for providing a first power supply;
the communication mode selection module comprises: and one end of the switch is respectively electrically connected with the other end of the first output controller, one end of the second output controller and the first power supply module, and the other end of the switch is grounded.
5. The serial port communication circuit according to claim 4, wherein the communication mode selection module further comprises:
one end of the first resistor is electrically connected with the first power supply module, and the other end of the first resistor is electrically connected with one end of the switch.
6. The serial port communication circuit according to any one of claims 2 to 5, further comprising:
the level conversion module is electrically connected with the other end of the first output controller and the other end of the second output controller respectively and used for converting the level of the data transmission according to the communication mode;
and the second power supply module is electrically connected with the level conversion module and is used for providing a second power supply.
7. The serial port communication circuit according to claim 6, wherein the level conversion module comprises:
a first level shifting module, the first level shifting module comprising: one end of the second resistor is electrically connected with the second power supply module, the other end of the second resistor is electrically connected with the anode of the first diode, and the cathode of the first diode is electrically connected with the other end of the first output controller;
a second level shifting module, the second level shifting module comprising: one end of the third resistor is electrically connected with the second power supply module, the other end of the third resistor is electrically connected with the anode of the second diode, and the anode of the second diode is electrically connected with the other end of the second output controller.
8. The serial port communication circuit according to claim 7, further comprising:
and the current limiting module is respectively electrically connected with the level conversion module, the first main control module and the second main control module and is used for carrying out current limiting operation on the data transmission signals.
9. The serial communication circuit according to claim 8, wherein the current limiting module comprises:
one end of the fourth resistor is electrically connected with the anode of the first diode, and the other end of the fourth resistor is electrically connected with the second main control module;
one end of the fifth resistor is electrically connected with the cathode of the second diode, and the other end of the fifth resistor is electrically connected with the second main control module.
10. The serial port communication circuit according to claim 9, wherein the first output controller and the second output controller are both model 74lvc1g 57.
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| CN202022122889.4U CN213122969U (en) | 2020-09-24 | 2020-09-24 | Serial port communication circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022122889.4U CN213122969U (en) | 2020-09-24 | 2020-09-24 | Serial port communication circuit |
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| CN213122969U true CN213122969U (en) | 2021-05-04 |
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