CN211697884U - Multifunctional serial port screen testing device and cascade testing device - Google Patents
Multifunctional serial port screen testing device and cascade testing device Download PDFInfo
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- CN211697884U CN211697884U CN201922327376.4U CN201922327376U CN211697884U CN 211697884 U CN211697884 U CN 211697884U CN 201922327376 U CN201922327376 U CN 201922327376U CN 211697884 U CN211697884 U CN 211697884U
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Abstract
The application discloses a multifunctional serial port screen testing device and a cascade testing device, wherein the multifunctional serial port screen testing device comprises at least two cascade serial port screen testing circuits and a main power supply circuit; the input ends of the at least two cascaded serial port screen test circuits are electrically connected with the output end of the main power supply circuit, and the main power supply circuit is used for supplying power to the at least two cascaded serial port screen test circuits. The application discloses multi-functional serial ports screen testing arrangement and cascade testing arrangement can realize that the power is gone up in unison to a plurality of serial ports screens, and then can realize improving the efficiency of software testing of serial ports screen.
Description
Technical Field
The application relates to the technical field of screen testing, in particular to a multifunctional serial port screen testing device and a cascade testing device.
Background
Generally, in the production stage of the serial port screen, a technician needs to test the serial port screen to ensure that the performance of the serial port screen meets the design requirements, for example, the serial port screen product is subjected to tests such as firmware engineering download, aging (normal temperature, high temperature and low temperature), QC and the like. However, when a large number of serial ports are tested, technicians cannot uniformly power on the large number of serial ports, and thus the test efficiency of the serial ports is low.
SUMMERY OF THE UTILITY MODEL
An object of this application embodiment discloses a multi-functional serial ports screen testing arrangement for the realization is unified to go up the electricity to a plurality of serial ports screens, and then realizes improving the efficiency of software testing of serial ports screen.
The application discloses a multifunctional serial port screen testing device in a first aspect, which comprises at least two cascaded serial port screen testing circuits and a main power supply circuit;
the input ends of the at least two cascaded serial port screen test circuits are electrically connected with the output end of the main power supply circuit, and the main power supply circuit is used for supplying power to the at least two cascaded serial port screen test circuits.
In this application, through cascading a plurality of serial ports screens, and then accessible main power supply circuit is unified to go up the electricity to a plurality of serial ports screens, so, just need not supply power alone to every serial ports screen, and then can simplify the test work load of a plurality of serial ports screens, and then improve efficiency of software testing.
In some optional embodiments, the serial port screen test circuit includes a switch circuit and an indicator light circuit, wherein an output terminal of the main power supply circuit is electrically connected to an input terminal of the switch circuit; the output end of the switch circuit is electrically connected with the input end of the indicator light circuit.
In this optional embodiment, through the switch circuit of every serial ports screen test circuit, just can independent control every serial ports screen test circuit's power break-make, and then can make when cutting off one of them serial ports screen test circuit's power, do not influence other serial ports screen test circuit's work, and then further improve the efficiency of serial ports screen test. On the other hand, the indicating lamp circuit is convenient for a test operator to determine the power on-off condition of each serial port screen test circuit.
In some optional embodiments, the serial port screen test circuit further includes a protection circuit, an input end of the protection circuit is electrically connected to an output end of the switch circuit, and an output end of the protection circuit is electrically connected to an input end of the indicator light circuit.
In this optional embodiment, through the protection circuit, the robustness of the serial port screen test circuit can be improved, and then the possibility that the operator has misoperation and abnormal current and the power supply damages the serial port screen test circuit is further improved, so that the service life of the serial port screen test circuit is prolonged.
In some optional embodiments, the protection circuit includes a first diode, a cathode of the first diode is electrically connected to the output terminal of the switch circuit, and an anode of the first diode is electrically connected to the input terminal of the indicator light circuit.
In this optional implementation, the influence of voltage abnormity on the serial port screen test circuit caused by reverse insertion and other reasons can be reduced through the one-way conductivity of the first diode, and further the damage probability of the serial port screen test circuit is further reduced.
In some optional embodiments, the first diode is a zener diode. In this optional implementation, the influence of voltage abnormity on the serial port screen test circuit caused by reverse insertion and other reasons can be reduced through the one-way conductivity of the voltage stabilizing diode, and further the damage probability of the serial port screen test circuit is further reduced. On the other hand, the manufacturing cost of the serial port screen test circuit can be reduced by selecting the voltage stabilizing diode.
In some optional embodiments, the protection circuit further includes a self-healing fuse, wherein one end of the self-healing fuse is electrically connected to the output terminal of the switch circuit, and the other end of the self-healing fuse is electrically connected to the negative electrode of the first diode.
In this optional embodiment, the overcurrent protection can be provided for the serial port screen test circuit through the self-recovery fuse.
In some optional embodiments, the serial port screen test circuit further includes a first data transmission circuit and a first communication terminal; the input end of the first data transmission circuit is electrically connected with the output end of the switch circuit; the output end of the first data transmission circuit is electrically connected with the first communication terminal.
In this optional embodiment, through first communication terminal, can be connected serial ports screen test circuit with the serial ports screen. Preferably, the type of first communication terminal can be confirmed according to the serial ports type of serial ports screen, so, just can communicate multi-functional serial ports screen testing arrangement and a plurality of and serial ports type different serial ports screen simultaneously, and then the multi-functional serial ports screen testing arrangement of this application has more excellent compatibility, and on the other hand has also improved the efficiency of software testing to the serial ports screen of different serial ports types.
In some embodiments, the multifunctional serial port screen testing device further comprises a USB interface terminal and a USB signal conversion circuit. The output end of the USB interface terminal is electrically connected with the input end of the USB signal conversion circuit, the output end of the USB signal conversion circuit is electrically connected with the output end of the first data transmission circuit, and the USB signal conversion circuit is used for converting USB signals and inputting the converted USB signals into the first data transmission circuit.
In this optional embodiment, through the USB interface terminal, multi-functional serial port screen testing arrangement can communicate with outside host computer, and then can receive test data, test instruction that outside host computer sent.
A second aspect of the present application discloses a cascade test device, which includes at least two multifunctional serial port screen test devices as disclosed in the first aspect of the present application, the multifunctional serial port screen test device including a second data transmission port circuit and a second communication terminal;
the input end of the second data transmission port circuit is electrically connected with the main power circuit;
the output end of the second data transmission port circuit is electrically connected with the second communication terminal, and the multifunctional serial port screen testing devices are electrically spliced through the second communication terminal, so that the second data transmission port circuit transmits communication data from one multifunctional serial port screen testing device to the other multifunctional serial port screen testing device through the second communication terminal.
In some optional embodiments, the cascade test apparatus further includes a main switch, and an output terminal of the main switch is electrically connected to an input terminal of the main power circuit in each multifunctional serial port screen test apparatus.
In this optional embodiment, can carry out power unified control to a plurality of multi-functional serial ports screen testing arrangement through master switch, and then further improve tester's efficiency of software testing.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic circuit structure diagram of a multifunctional serial port screen testing device disclosed in an embodiment of the present application;
fig. 2 is a schematic circuit diagram of an overall power circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit structure diagram of a multifunctional serial port screen test circuit disclosed in the embodiment of the present application;
fig. 4 is a schematic circuit structure diagram of a USB interface terminal disclosed in the embodiment of the present application;
fig. 5 is a schematic circuit diagram of a USB signal conversion circuit according to an embodiment of the present disclosure;
FIG. 6 is a schematic circuit diagram of a clock circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a cascade test apparatus disclosed in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example one
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a multifunctional serial port screen testing device disclosed in an embodiment of the present application. As shown in fig. 1, the multifunctional serial port screen testing device includes two cascaded serial port screen testing circuits 102 and a main power supply circuit 101, wherein input ends of the two cascaded serial port screen testing circuits 102 are electrically connected to an output end of the main power supply circuit 101, and the main power supply circuit 101 is configured to supply power to at least two cascaded serial port screen testing circuits 102.
In this application embodiment, through cascading a plurality of serial ports screens, and then accessible main power supply circuit is unified to go up the electricity to a plurality of serial ports screens, so, just need not supply power alone to every serial ports screen, and then can simplify the test work load of a plurality of serial ports screens, and then improve efficiency of software testing.
The power supply circuit can be electrically connected with three serial port screen test circuits or four serial port screen test circuits, namely the power supply circuit can be electrically connected with at least two serial port screen test circuits, and the embodiment selects two serial port screen test circuits and the power supply circuit to be an optimal mode.
Exemplarily, as shown in fig. 2, fig. 2 is a schematic circuit structure diagram of a total power circuit, and in fig. 2, the total power circuit includes a first power supply P1 and a second power supply P2, a total power switch SW1, a second diode D1, a first capacitor C13, a power conversion unit U2, a first resistor R2, a second capacitor C14, and a total indicator light LED.
As shown in fig. 2, the first power source P1 and the second power source P2 can be electrically connected to form a total power source, the second diode D1 and the first capacitor C13 form a voltage-stabilizing filter circuit, and the first resistor R2, the second capacitor C14, and the total indicator LED form an indicator circuit.
In fig. 2, the power conversion unit U2 may be an LDO to 3V unit capable of converting the voltage at the input to 3V to provide 3V to the indicator light circuit.
It should be noted that the LDO to 3V unit may be an LDO to 3V module with a model number "XC 6203E332 PR".
In fig. 2, the main power supply circuit is electrically connected to the serial port screen test circuit through the VCC node.
In some optional embodiments, the serial port screen test circuit includes a switch circuit and an indicator light circuit, wherein an output terminal of the main power supply circuit is electrically connected with an input terminal of the switch circuit; the output end of the switch circuit is electrically connected with the input end of the indicator light circuit.
In this optional embodiment, through the switch circuit of every serial ports screen test circuit, just can independent control every serial ports screen test circuit's power break-make, and then can make when cutting off one of them serial ports screen test circuit's power, do not influence other serial ports screen test circuit's work, and then further improve the efficiency of serial ports screen test. On the other hand, the indicating lamp circuit is convenient for a test operator to determine the power on-off condition of each serial port screen test circuit.
In some optional embodiments, the serial port screen test circuit further includes a protection circuit, an input terminal of the protection circuit is electrically connected to an output terminal of the switch circuit, and an output terminal of the protection circuit is electrically connected to an input terminal of the indicator light circuit.
In this optional embodiment, through the protection circuit, the robustness of the serial port screen test circuit can be improved, and then the possibility that the operator has misoperation and abnormal current and the power supply damages the serial port screen test circuit is further improved, so that the service life of the serial port screen test circuit is prolonged.
In some optional embodiments, the protection circuit includes a first diode, a cathode of the first diode is electrically connected to the output terminal of the switch circuit, and an anode of the first diode is electrically connected to the input terminal of the indicator light circuit.
In this optional implementation, the influence of voltage abnormity on the serial port screen test circuit caused by reverse insertion and other reasons can be reduced through the one-way conductivity of the first diode, and further the damage probability of the serial port screen test circuit is further reduced.
In some alternative embodiments, the first diode is a zener diode. In this optional implementation, the influence of voltage abnormity on the serial port screen test circuit caused by reverse insertion and other reasons can be reduced through the one-way conductivity of the voltage stabilizing diode, and further the damage probability of the serial port screen test circuit is further reduced. On the other hand, the manufacturing cost of the serial port screen test circuit can be reduced by selecting the voltage stabilizing diode.
In some optional embodiments, the protection circuit further comprises a self-healing fuse, wherein,
one end of the self-recovery fuse is electrically connected with the output end of the switch circuit, and the other end of the self-recovery fuse is electrically connected with the cathode of the first diode. In this optional embodiment, the overcurrent protection can be provided for the serial port screen test circuit through the self-recovery fuse.
In some optional embodiments, the serial port screen test circuit further includes a first data transmission circuit and a first communication terminal; the input end of the first data transmission circuit is electrically connected with the output end of the switch circuit; the output end of the first data transmission circuit is electrically connected with the first communication terminal.
In this optional embodiment, through first communication terminal, can be connected serial ports screen test circuit with the serial ports screen. Preferably, the type of first communication terminal can be confirmed according to the serial ports type of serial ports screen, so, just can communicate multi-functional serial ports screen testing arrangement and a plurality of and serial ports type different serial ports screen simultaneously, and then the multi-functional serial ports screen testing arrangement of this application has more excellent compatibility, and on the other hand has also improved the efficiency of software testing to the serial ports screen of different serial ports types.
Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of a multifunctional serial port panel test circuit, as shown in fig. 3, the serial port panel test circuit includes a sub-switch SW5, a self-recovery fuse F6, a first diode D2, a second resistor R8, a third diode D4, and an interface socket U4.
In fig. 3, the sub-switch SW3 forms a switch circuit, the first diode D2 and the self-recovery fuse F6 form a protection circuit, the second resistor R8 and the third diode D4 form an indicator circuit, and the interface socket sub-circuit U4 forms a first data transmission circuit.
In fig. 3, the interface socket U4 is an interface socket with the model of "FPC 10", wherein the FPC10 interface socket includes pins No. 1-12, pins No. 11 and 12 are grounded, pin No. 5 is used for receiving an RXD signal, pin No. 6 is used for receiving a TXD signal, and the multifunctional serial port screen testing device according to the embodiment of the present application communicates with a serial port screen through the RXD signal and the TXD signal.
In the embodiment of the present application, the interface socket U4 may also be any one of the interface sockets with the models "XH2.548P", "10 PFPC 1.0", "PH 2.08" and "5264", which is not limited in the present application. It should be noted that, for specific connection relationships between pins No. 1 to 4 and pins No. 7 to 10 of the FPC10 interface socket, reference may be made to interface definitions of a serial port screen, which is not described herein again.
It should be noted that, the specific structure of the first communication terminal, the electrical connection between the first communication terminal and the chip may refer to the structure of the existing terminal, and the electrical connection manner of the chip, which are not described in detail herein.
In some embodiments, the multifunctional serial port screen testing device further comprises a USB interface terminal and a USB signal conversion circuit. The output end of the USB interface terminal is electrically connected with the input end of the USB signal conversion circuit, the output end of the USB signal conversion circuit is electrically connected with the output end of the first data transmission circuit, and the USB signal conversion circuit is used for converting the USB signal and inputting the converted USB signal into the first data transmission circuit.
In this optional embodiment, through the USB interface terminal, multi-functional serial port screen testing arrangement can communicate with outside host computer, and then can receive test data, test instruction that outside host computer sent.
For example, referring to fig. 4, fig. 4 is a schematic circuit structure diagram of a USB interface terminal. In fig. 4, the USB interface terminal USB1 includes a VCC pin, a D-pin, a D + pin, an ID pin, and a GND pin, wherein the GND pin is grounded, the VCC pin is connected to a USB _ VCC, the D-pin and the D + pin are electrically connected to the USB signal conversion circuit respectively for signals, the D-pin is used to output a USD _ DM signal to the USB signal conversion circuit, and the D + pin is used to output a USD _ UP signal to the USB signal conversion circuit.
It should be noted that, please refer to the connection method of the USB pin in the prior art (e.g., the technical manual of USB) for the connection of the ID pin of the USB interface terminal USB, which is not described herein again.
Referring to fig. 5, fig. 5 is a schematic circuit diagram of a USB signal conversion circuit. In fig. 5, the USB signal conversion circuit U3 includes a GND pin, a TXD pin, an RXD pin, a D + pin, and a D-pin, where the GND pin is grounded, the TXD pin is electrically connected to pin No. 6 of the interface socket U4 in fig. 3, and the RXD pin is electrically connected to pin No. 5 of the interface socket U4 in fig. 3, so that the USB signal conversion circuit U3 can convert a USB signal into a serial signal, and further input the serial signal to the interface socket U4, and further the interface socket U4 operates a serial screen according to the serial signal. On the other hand, the D + pin of the USB signal conversion circuit U3 is electrically connected with the D + pin of the USB interface terminal USB, and the D-pin of the USB signal conversion circuit U3 is electrically connected with the D-pin of the USB interface terminal USB.
As another example, the USB signal conversion circuit U3 may be of the type "CH 340". It should be noted that, as for the specific usage method or the electrical connection method of the VCC pin, the R232 pin, the RTS # pin, the DTR # pin, the DCD # pin, the RI # pin, the DSR # pin, and the CTS # of the USB signal conversion circuit U3 in fig. 5, the usage method of the CH340 type chip in the prior art may be referred to, for example, the technical manual of the CH340 type chip is referred to, and details of this application are not repeated.
In some optional embodiments, the multifunctional serial port screen testing device further includes a clock circuit, an output terminal of the clock circuit is electrically connected to an input terminal of the USB signal conversion circuit, and the clock circuit is configured to provide a clock signal to the USB signal conversion circuit.
Referring to fig. 6, fig. 6 is a circuit diagram of a clock circuit, as shown, the clock circuit outputs a CH340_ XI signal to the pin XI of the USB signal conversion circuit U3, and outputs a CH340_ XO signal to the XO pin of the USB signal conversion circuit U3, so that the clock circuit can provide a clock signal to the USB signal conversion circuit U3.
Example two
The embodiment of the application discloses a cascade test device, which comprises at least two multifunctional serial port screen test devices as disclosed in the embodiment of the application, wherein each multifunctional serial port screen test device comprises a second data transmission port circuit and a second communication terminal;
the input end of the second data transmission port circuit is electrically connected with the main power circuit;
the output end of the second data transmission port circuit is electrically connected with the second communication terminal, and the multifunctional serial port screen testing devices are electrically spliced through the second communication terminal, so that the second data transmission port circuit transmits communication data from one multifunctional serial port screen testing device to the other multifunctional serial port screen testing device through the second communication terminal.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a cascade test apparatus. As shown in fig. 7, the multifunctional serial port screen testing device is in a regular hexagon shape, wherein the multifunctional serial port screen testing device can be connected with a first screen (i.e. a serial port screen), a second screen, a third screen, a fourth screen, a fifth screen and a sixth screen. In addition, through the second communication terminal, the N multifunctional serial port screen testing devices are electrically connected with each other.
In some optional embodiments, the cascade test apparatus further includes a main switch, and an output terminal of the main switch is electrically connected to an input terminal of a main power circuit in each multifunctional serial port screen test apparatus.
In this optional embodiment, can carry out power unified control to a plurality of multi-functional serial ports screen testing arrangement through master switch, and then further improve tester's efficiency of software testing.
The effect of the cascade test apparatus implemented in the present application will be described below with reference to a specific use process of the cascade test apparatus implemented in the present application.
On the first hand, when the cascade test device is used as a downloading tool, firstly, the cascade test device is connected with a plurality of serial port screens, secondly, each serial port screen is inserted with an SD card or a U disk stored with an upgrading program, and finally, the serial port screens are uniformly electrified. In this process, because the equal independent power supply of multi-functional serial ports screen testing arrangement, and then the equal independent power supply of each serial ports screen, so, when a certain multi-functional serial ports screen testing arrangement or a certain serial ports screen trouble, just can cut off the power of the multi-functional serial ports screen testing arrangement or serial ports screen that break down alone, and do not exert an influence to other normal serial ports screen or multi-functional serial ports screen testing arrangement that upgrade.
In the second aspect, when the cascade test device is used as an aging test device, firstly, the cascade test device is connected with a plurality of serial port screens, secondly, each serial port screen is plugged with an SD card or a U disk which stores an upgrading program, then, the serial port screens are uniformly electrified, and at the moment, all the serial port screens can be in cascade communication because all the serial port screens are connected in series. Furthermore, an operator can communicate and connect the first multifunctional serial port screen testing device in the cascade testing device with an external PC (host computer), so that the operator can continuously scroll the screen in the aging process and play music videos and the like by sending corresponding commands to all serial port screens through a software serial port assistant on the external PC, and further whether the performance, communication and stability of the screen are reliable is detected. Therefore, the operator can detect the serial port screens in batches.
In the embodiments disclosed in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A multifunctional serial port screen testing device is characterized by comprising at least two cascaded serial port screen testing circuits and a main power supply circuit;
the input ends of the at least two cascaded serial port screen test circuits are electrically connected with the output end of the main power supply circuit, and the main power supply circuit is used for supplying power to the at least two cascaded serial port screen test circuits.
2. The multifunctional serial port screen testing device as claimed in claim 1, wherein the serial port screen testing circuit comprises a switch circuit and an indicator light circuit;
the output end of the main power supply circuit is electrically connected with the input end of the switch circuit;
the output end of the switch circuit is electrically connected with the input end of the indicator light circuit.
3. The multifunctional serial port screen test device of claim 2, wherein the serial port screen test circuit further comprises a protection circuit;
the input end of the protection circuit is electrically connected with the output end of the switch circuit;
the output end of the protection circuit is electrically connected with the input end of the indicator light circuit.
4. The multifunctional serial port screen test device of claim 3, wherein the protection circuit comprises a first diode;
the cathode of the first diode is electrically connected with the output end of the switch circuit, and the anode of the first diode is electrically connected with the input end of the indicator light circuit.
5. The multifunctional serial port screen testing device according to claim 4, wherein the first diode is a zener diode.
6. The multifunctional serial port screen testing device according to claim 4, wherein the protection circuit further comprises a self-restoring fuse;
one end of the self-recovery fuse is electrically connected with the output end of the switch circuit, and the other end of the self-recovery fuse is electrically connected with the cathode of the first diode.
7. The multifunctional serial port screen test device according to claim 2, wherein the serial port screen test circuit further comprises a first data transmission circuit and a first communication terminal;
the input end of the first data transmission circuit is electrically connected with the output end of the switch circuit;
the output end of the first data transmission circuit is electrically connected with the first communication terminal.
8. The multifunctional serial port screen testing device of claim 7, further comprising a USB interface terminal, a USB signal conversion circuit;
the output end of the USB interface terminal is electrically connected with the input end of the USB signal conversion circuit;
the output end of the USB signal conversion circuit is electrically connected with the output end of the first data transmission circuit, and the USB signal conversion circuit is used for converting a USB signal and inputting the converted USB signal into the first data transmission circuit.
9. A cascade test device, characterized in that the cascade test device comprises at least two multifunctional serial port screen test devices according to any one of claims 1 to 8, the multifunctional serial port screen test devices comprising a second data transmission port circuit and a second communication terminal;
the input end of the second data transmission port circuit is electrically connected with the main power circuit;
the output end of the second data transmission port circuit is electrically connected with the second communication terminal, and the multifunctional serial port screen testing devices are electrically spliced through the second communication terminal, so that the second data transmission port circuit transmits communication data from one multifunctional serial port screen testing device to the other multifunctional serial port screen testing device through the second communication terminal.
10. The cascade test apparatus of claim 9, further comprising a master switch,
the output end of the master switch is electrically connected with the input end of the master power supply circuit in each multifunctional serial port screen testing device.
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| CN201922327376.4U CN211697884U (en) | 2019-12-20 | 2019-12-20 | Multifunctional serial port screen testing device and cascade testing device |
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| CN201922327376.4U CN211697884U (en) | 2019-12-20 | 2019-12-20 | Multifunctional serial port screen testing device and cascade testing device |
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