A 2m cable detection circuit

Abstract

The utility model discloses a 2M cable detection circuit. The circuit comprises a power module, an external interface module, a switching module and an audible and light drive module; the signal end of the external interface module receives a signal; the power end of the external interface module is connected with the first output end of the power module; the first and second physical interfaces of the external interface module are connected with the first type connector; the third and fourth physical interfaces are connected with the second type connector; the first grounding end of the external interface module is electrically connected with the second physical interface of the external interface module and the second output end of the power module; the second grounding end of the external interface module is connected with the fourth physical interface of the external interface module and also connected with the third physical interface of the external interface module through the switching module; the control end of the audible and light drive module is connected with the signal end of the external interface module; the power end of the audible and light drive module is electrically connected with the first output end of the power module; the grounding end of the audible and light drive module is connected with the first and third physical interfaces of the external interface module.

Description

Technical Field

[0001] This utility model relates to the field of railway signal detection, and in particular to a 2M cable detection circuit. Background Technology

[0002] Railway communication equipment mostly uses 2M transmission for data transmission, and 2M coaxial cables are widely used. When troubleshooting, first check if the cable is disconnected (generally, the cable can be connected to Q9 connectors, L9 connectors, or Q9 connectors). Then check if there is a signal output at the physical connector on the cable.

[0003] Typically, a 2M bit error rate tester is used to confirm the presence of a signal, and then a multimeter is used to measure continuity. This process involves carrying many instruments, and it is inconvenient to detect and measure the continuity of the cable and whether there is a 2M signal on the physical connector of the cable. It requires multiple people to cooperate in the measurement, which leads to a large labor cost. Utility Model Content

[0004] This invention provides a 2M cable detection circuit, which facilitates troubleshooting during on-site maintenance and improves work efficiency by utilizing a 2M cable with audible and visual prompts and a 2M signal testing device.

[0005] To achieve the above objectives, this utility model provides a 2M cable detection circuit, which includes: a power module, an external interface module, a switching module, and an audio-visual driving module.

[0006] The first output terminal of the power module outputs a voltage source signal; the second output terminal of the power module outputs a ground signal.

[0007] The signal terminal of the external interface module receives signals; the power terminal of the external interface module is connected to the first output terminal of the power module; the power terminal of the external interface module is electrically connected to the first output terminal of the power module, the second physical interface of the external interface module, and the fourth physical interface of the external interface module; the signal terminal of the external interface module is also connected to the first physical interface of the external interface module and the third physical interface of the external interface module.

[0008] The first physical interface and the second physical interface of the external interface module are both used to connect to the first type of connector; the third physical interface and the fourth physical interface of the external interface module are both used to connect to the second type of connector.

[0009] The first ground terminal of the external interface module is electrically connected to the second physical interface of the external interface module and the second output terminal of the power supply module; the second ground terminal of the external interface module is electrically connected to the fourth physical interface of the external interface module and the second output terminal of the power supply module; the second ground terminal of the external interface module is also connected to the third physical interface of the external interface module through a switching module; the first physical interface of the external interface module is also connected to the first signal ground; the third physical interface of the external interface module is also connected to the second signal ground.

[0010] The control terminal of the acoustic-optical driving module is connected to the signal terminal of the external interface module; the power supply terminal of the acoustic-optical driving module is electrically connected to the voltage source; and the ground terminal of the acoustic-optical driving module is connected to the first physical interface and the third physical interface of the external interface module.

[0011] Optionally, the power module includes a power supply body, an overcurrent protection unit, and a power control unit;

[0012] The first end of the power supply body is electrically connected to the input end of the overcurrent protection unit; the output end of the overcurrent protection unit is electrically connected to the input end of the power control unit; the output end of the power control unit serves as the first output end of the power module, outputting a voltage source signal; the second end of the power supply body serves as the second output end of the power module, outputting a ground signal.

[0013] Optionally, the power control unit includes a first switching switch; the overcurrent protection unit includes a fuse.

[0014] Optionally, the power module further includes a power indicator unit; the first end of the power indicator unit is electrically connected to the output end of the power control unit; and the second end of the power indicator unit is electrically connected to the second end of the power supply body.

[0015] Optionally, the power indicator unit includes a first light-emitting diode and a current-limiting resistor;

[0016] The first terminal of the first light-emitting diode is electrically connected to the first terminal of the current-limiting resistor; the second terminal of the current-limiting resistor is electrically connected to the output terminal of the power control unit.

[0017] The second terminal of the first light-emitting diode is electrically connected to the second terminal of the power supply body.

[0018] Optionally, the sound and light driving module includes a light-emitting driving control unit, a light-emitting unit, a sound-emitting driving control unit, and a buzzer;

[0019] The control terminal of the light-emitting drive control unit is connected to the signal terminal of the external interface module; the first terminal of the light-emitting drive control unit is electrically connected to the voltage source.

[0020] The second end of the light-emitting drive control unit is connected to the input end of the light-emitting unit; the second end of the light-emitting drive control unit is also electrically connected through the control end of the sound drive control unit; the first end of the sound drive control unit is electrically connected to the voltage source through the buzzer; the second end of the sound drive control unit is connected to the first physical interface and the third physical interface of the external interface module.

[0021] The output terminal of the light-emitting unit is connected to the first physical interface and the third physical interface of the external interface module.

[0022] Optionally, the light-emitting drive control unit includes a first transistor and a first resistor;

[0023] The control terminal of the first transistor is connected to the signal terminal of the external interface module; the first terminal of the first transistor is electrically connected to the voltage source; and the second terminal of the first transistor is electrically connected to the light-emitting unit.

[0024] Optionally, the light-emitting unit includes a second resistor and a second light-emitting diode;

[0025] The first end of the second resistor is electrically connected to the second end of the first transistor; the second end of the second resistor is electrically connected to the first end of the second light-emitting diode; the second end of the second light-emitting diode is connected to the first physical interface of the external interface module and the third physical interface of the external interface module.

[0026] Optionally, the sound drive control unit includes: a third resistor, a fourth resistor, and a second transistor;

[0027] The first end of the third resistor is electrically connected to the second end of the light-emitting drive control unit; the second end of the third resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the control terminal of the second transistor; the first end of the second transistor is electrically connected to the voltage source through the buzzer; the second end of the second transistor is connected to the first physical interface of the external interface module and the third physical interface of the external interface module.

[0028] Optionally, the sound drive control unit further includes: a filter capacitor;

[0029] The first terminal of the filter capacitor is electrically connected to the first terminal of the third resistor; the second terminal of the filter capacitor is electrically connected to the second terminal of the second transistor.

[0030] In this embodiment of the invention, when a first type connector on a 2M cable is inserted into the first physical interface of the external interface module, and another first type connector is inserted into the second physical interface of the external interface module, the continuity of the first type connector-to-first type connector 2M cable can be quickly detected through the power module, external interface module, switching module, and audio-visual drive module; or when a second type connector on a 2M cable is inserted into the third physical interface of the external interface module, and another second type connector is inserted into the fourth physical interface of the external interface module, the continuity of the second type connector-to-second type connector 2M cable can be quickly detected through the power module, external interface module, switching module, and audio-visual drive module; or when a first ... second physical interface of the external interface module, the continuity of the second type connector-to-second type connector 2M cable can be quickly detected through the power module, external interface module, switching module, and audio-visual drive module; or when a first type connector on a 2M cable is inserted into the third physical interface of the external interface module, and another second type connector is inserted into the fourth physical interface of the external interface module, the continuity of the second type connector-to-second type connector 2M cable can be quickly detected through the power module, external interface module, switching module, and audio-visual drive module. When the first physical interface of the external interface module is connected, and another second-type connector is inserted into the third physical interface of the external interface module, the continuity of the 2M cable between the first-type connector and the second-type connector can be quickly detected through the power module, the external interface module, the switching module, and the audio-visual driver module. In addition, when the first-type connector on the 2M cable is inserted into the third physical interface of the external interface module, the presence of a 2M signal in the first-type connector can be quickly detected through the power module, the external interface module, the switching module, and the audio-visual driver module. Or, when the second-type connector on the 2M cable is inserted into the fourth physical interface of the external interface module, the presence of a 2M signal in the second-type connector can be quickly detected through the power module, the external interface module, the switching module, and the audio-visual driver module.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a 2M cable detection circuit provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the power module provided in an embodiment of the present utility model;

[0035] Figure 3This is a schematic diagram of another 2M cable detection circuit provided in this embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of an acoustic-optical driving module provided in an embodiment of this utility model. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] Figure 1 This is a schematic diagram of a 2M cable detection circuit provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the 2M cable detection circuit includes: a power module 10, an external interface module 20, a switching module 30, and an audio-visual driving module 40; the first output terminal of the power module 10 outputs a voltage source signal VCC; the second output terminal of the power module 10 outputs a ground signal GND.

[0040] The signal terminal of the external interface module 20 receives signal IO; the power terminal of the external interface module 20 is electrically connected to the first output terminal of the power module 10, the second physical interface L2 of the external interface module 20, and the fourth physical interface L4 of the external interface module 20; the signal terminal of the external interface module 20 is also connected to the first physical interface L1 and the third physical interface L3 of the external interface module 20.

[0041] The first physical interface L1 and the second physical interface L2 of the external interface module 20 are both used to connect to the first type connector Q9; the third physical interface L3 and the fourth physical interface L4 of the external interface module 20 are both used to connect to the second type connector L9.

[0042] The first ground terminal GND of the external interface module 20 is electrically connected to the second physical interface L2 of the external interface module 20 and the second output terminal of the power module 10; the second ground terminal GND' of the external interface module 20 is electrically connected to the fourth physical interface L4 of the external interface module 20 and the second output terminal of the power module 10; the second ground terminal GND' of the external interface module 20 is also connected to the third physical interface L3 of the external interface module 20 through the switching module 30; the first physical interface L1 of the external interface module 20 is also connected to the first signal ground GND2; the third physical interface L3 of the external interface module 20 is also connected to the second signal ground GND2'.

[0043] The control terminal of the acoustic-optical drive module 40 is connected to the signal terminal of the external interface module 20; the power supply terminal of the acoustic-optical drive module 40 is electrically connected to the voltage source VCC; and the ground terminal of the acoustic-optical drive module 40 is connected to the first signal ground GND2 and the second signal ground GND2'.

[0044] Specifically, when the switching module 30 is in the non-operating mode, when the first type connector Q9 on the 2M cable is inserted into the first physical interface L1 of the external interface module, and the other first type connector Q9 is inserted into the second physical interface L2 of the external interface module, the power signal VCC output from the first output terminal of the power module 10 is sent to the signal terminal IO of the external interface module 20 through the two first type connectors Q9. The signal terminal IO of the external interface module 20 receives the power signal VCC. At the same time, the ground signal of the first ground terminal GND of the external interface module 20 is sent to the first signal ground GND2 through the two first type connectors Q9. Thus, the control terminal of the audio-visual drive module 30 is controlled by the power signal VCC. Furthermore, the audio-visual driving module 30 operates under the drive of the power signal VCC and the first signal ground GND2. If, when the first type connector Q9 on the 2M cable is inserted into the first physical interface L1 of the external interface module 20, and another first type connector Q9 is inserted into the second physical interface L2 of the external interface module 20, the wires inside the two first type connectors Q9 are disconnected, and the signal terminal IO of the external interface module 20 cannot receive the power signal; or if the external insulation wires inside the two first type connectors Q9 are disconnected, the grounding signal GND cannot be sent to the first signal ground GND2, and thus the audio-visual driving module 30 cannot operate. In this way, the continuity detection of the first type connector-first type connector 2M cable can be quickly detected.

[0045] When the switching module 30 is in the non-operating mode, when the second type connector L9 on the 2M cable is inserted into the third physical interface L3 of the external interface module 20, and another second type connector L9 is inserted into the fourth physical interface L4 of the external interface module, the power signal VCC output from the first output terminal of the power module 10 is sent to the signal terminal IO of the external interface module 20 through the two second type connectors L9, and the signal terminal IO of the external interface module 20 receives the power signal VCC; at the same time, the ground signal GND' of the second ground terminal of the external interface module 20 is sent to the second signal terminal through the two second type connectors L9. With ground GND2', the control terminal of the audio-visual driving module 30 operates under the control of the power signal VCC and driven by the power signal VCC and the second signal ground GND2'. If the wires in the two second-type connectors L9 are disconnected, the signal terminal IO of the external interface module 20 will not receive the power signal; or if the external insulation wires in the two second-type connectors L9 are disconnected, the grounding signal cannot be sent to the second signal ground GND2', thus the audio-visual driving module 30 cannot operate. This enables rapid detection of continuity of the second-type connector-second-type connector 2M cable.

[0046] Similarly, when the switching module 30 is in the non-operating mode, when the first type connector Q9 on the 2M cable is inserted into the first physical interface L1 of the external interface module 20, and another second type connector L9 is inserted into the fourth physical interface L4 of the external interface module, the power signal VCC output from the first output terminal of the power module 10 is sent to the signal terminal IO of the external interface module 20 through the first and second type connectors, and the signal terminal IO of the external interface module 20 receives the power signal VCC; at the same time, the ground signal GND' of the second ground terminal of the external interface module 20 is sent to the first signal ground GND2 through the first and second type connectors, so the control terminal of the audio-visual drive module 30 receives the power signal VCC. Under the control of C and driven by the power signal VCC and the first signal ground GND2, the audible and visual driving module 30 operates. If the wires in the first and second type connectors are broken, the signal terminal of the external interface module 20 will not receive the power signal VCC; or if the external insulation wires in the first and second type connectors are broken, the grounding signal cannot be sent to the first signal ground GND2, thus preventing the audible and visual driving module 30 from operating. This allows for rapid detection of continuity in the 2M cable between the second type connector and the first type connector. This facilitates troubleshooting of broken wires in various connectors during on-site maintenance, improves operational efficiency, reduces fault handling time, increases railway operating efficiency, and reduces instrument procurement costs.

[0047] Additionally, when the switching module 30 is in working mode, when the second type connector L9 on the 2M cable is inserted into the third physical interface L3 of the external interface module 20, the second ground terminal GND' of the external interface module 10 can send the ground signal GND to the second signal ground GND2' through the switching module. Thus, when a 2M signal passes through the second type connector L9, the 2M signal is sent to the acoustic-optical drive module 30. In this way, the control terminal of the acoustic-optical drive module 30 is controlled by the power signal VCC and driven by the power signal VCC and the second signal ground GND2', and the acoustic-optical drive module 30 works. When no 2M signal passes through the second type connector L9, the acoustic-optical drive module 30 does not work.

[0048] Similarly, when the first type connector Q9 on the 2M cable is inserted into the first physical interface L1 of the external interface module, the second grounding terminal of the external interface module 20 can send a grounding signal to the first signal ground GND2 through the switching module 30. Thus, when a 2M signal passes through the first type connector Q9, the 2M signal is sent to the audio-visual driving module 30; when no 2M signal passes through the first type connector Q9, the audio-visual driving module 30 does not operate. In this way, this solution can also quickly detect whether there is a signal in the 2M cable (first connector Q9 or second connector L9).

[0049] Optionally, based on the above embodiments, each module can be further refined. Figure 2 This is a structural schematic diagram of a power module provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the power module 10 includes a power supply body 11, an overcurrent protection unit 12, and a power control unit 13; the first end of the power supply body 11 is electrically connected to the input end of the overcurrent protection unit 12; the output end of the overcurrent protection unit 12 is electrically connected to the input end of the power control unit 13; the output end of the power control unit 13 serves as the first output end of the power module 10, outputting a voltage source signal VCC; the second end of the power supply body 11 serves as the second output end of the power module 10, outputting a ground signal GND.

[0050] The power control unit 12 may include a first switching switch K1; the first switching switch K1 is in a closed state during the 2M cable detection process; it can be in an open state when an abnormality is detected in the 2M cable; the overcurrent protection unit 13 includes a fuse F1; the overcurrent protection unit 13 can play a protective role by disconnecting in time when a large current occurs; the power supply body 11 may be composed of multiple battery cells; preferably, the power supply body 11 may be composed of two battery cells.

[0051] Optional, continue to refer to Figure 2The power module 10 also includes a power indicator unit 14; the first end of the power indicator unit 14 is electrically connected to the output end of the power control unit 13; the second end of the power indicator unit 14 is electrically connected to the second end of the power body 11.

[0052] In some embodiments, the power indicator unit 14 includes a first light-emitting diode D1 and a current-limiting resistor R0; the first end of the first light-emitting diode D1 is electrically connected to the first end of the current-limiting resistor R0; the second end of the current-limiting resistor R0 is electrically connected to the output end of the power control unit 13; the second end of the first light-emitting diode D1 is electrically connected to the second end of the power supply body 11; it can be understood that when the power control unit 13 is closed, the light-emitting diode D0 indicates that the power module 10 outputs a power signal.

[0053] Optionally, this embodiment further refines the acousto-optic driving module 40. Figure 3 This is a schematic diagram of another 2M cable detection circuit provided in this embodiment of the present invention, as shown below. Figure 3 As shown, the sound and light driving module 40 includes a light-emitting driving control unit 41, a light-emitting unit 42, a sound-emitting driving control unit 43, and a buzzer 44; the control terminal of the light-emitting driving control unit 41 is connected to the signal terminal of the external interface module 20; the first terminal of the light-emitting driving control unit 42 is electrically connected to the voltage source VCC; the second terminal of the light-emitting driving control unit 41 is connected to the input terminal of the light-emitting unit 42; the second terminal of the light-emitting driving control unit 41 is also electrically connected through the control terminal of the sound-emitting driving control unit 43; the first terminal of the sound-emitting driving control unit 43 is electrically connected to the voltage source VCC through the buzzer 44; the second terminal of the sound-emitting driving control unit 43 is connected to the first signal ground GND2 and the second signal ground GND2'; the output terminal of the light-emitting unit 42 is connected to the first signal ground GND2 and the second signal ground GND2'.

[0054] In this embodiment, under the control of the output signal of the signal terminal IO of the external interface module 20, the light-emitting drive control unit 41 drives the light-emitting unit 42 to emit light, and simultaneously drives the sound drive control unit 43 to output a sound drive signal to the buzzer, thus making the buzzer work at the same time. The light-emitting drive control unit 41 can be composed of a single transistor or multiple transistors; this embodiment is not limited to this. The sound drive control unit 43 can be composed of a single transistor or multiple transistors; this embodiment is not limited to this.

[0055] Optional, Figure 4 This is a schematic diagram of the acoustic-optical driving module provided in an embodiment of the present invention, as shown below. Figure 3As shown, the light-emitting drive control unit 41 in the sound and light driving module includes a first transistor Q1 and a first resistor R1; the control terminal of the first transistor Q1 is connected to the signal terminal IO of the external interface module 20; the first terminal of the first transistor Q1 is electrically connected to the voltage source VCC; and the second terminal of the first transistor Q1 is electrically connected to the light-emitting unit 42.

[0056] Optional, continue to refer to Figure 4 The light-emitting unit 42 includes a second resistor R2 and a second light-emitting diode D2; the first end of the second resistor R2 is electrically connected to the second end of the first transistor Q1; the second end of the second resistor R2 is electrically connected to the first end of the second light-emitting diode D2; the second end of the second light-emitting diode D2 is connected to the first signal ground GND2 and the second signal ground GND2'.

[0057] Optional, continue to refer to Figure 4 The sound-driven control unit 43 includes: a third resistor R3, a fourth resistor R4, and a second transistor Q2; the first end of the third resistor R3 is electrically connected to the second end of the light-driven control unit 41; the second end of the third resistor R3 is electrically connected to the first end of the fourth resistor R4; the second end of the fourth resistor R4 is electrically connected to the control terminal of the second transistor Q2; the first end of the second transistor Q2 is electrically connected to the voltage source VCC through a buzzer 44; the second end of the second transistor Q2 is connected to the first signal ground GND2 and the second signal ground GND2'.

[0058] Specifically, when the output signal of the signal terminal of the external interface module 20 is controlled, the first transistor Q1 is turned on; when the first transistor Q1 is turned on, it drives the second light-emitting diode D2 to emit light; at the same time, when the first transistor Q1 is turned on, the signal is output to the second transistor Q2 through the third resistor R3 and the fourth resistor R4, and the second transistor Q2 is turned on, thereby driving the buzzer 44 to work; wherein, the first resistor R1 can limit the current of the output signal of the signal terminal of the external interface module 20.

[0059] Optional, continue to refer to Figure 4 The sound drive control unit 43 also includes: a filter capacitor C1; the first terminal of the filter capacitor C1 is electrically connected to the first terminal of the third resistor R3; the second terminal of the filter capacitor C1 is electrically connected to the second terminal of the second transistor Q2. The filter capacitor C1 serves to filter and prevent the buzzer from making a hissing sound.

[0060] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A 2M cable detection circuit, characterized by, include: Power supply module, external interface module, switching module and audio-visual driver module; The first output terminal of the power module outputs a voltage source signal; The second output terminal of the power module outputs a ground signal; The signal terminal of the external interface module receives signals; the power terminal of the external interface module is connected to the first output terminal of the power module; the power terminal of the external interface module is electrically connected to the first output terminal of the power module, the second physical interface of the external interface module, and the fourth physical interface of the external interface module; the signal terminal of the external interface module is also connected to the first physical interface of the external interface module and the third physical interface of the external interface module. The first physical interface and the second physical interface of the external interface module are both used to connect to a first type of connector; the third physical interface and the fourth physical interface of the external interface module are both used to connect to a second type of connector. The first ground terminal of the external interface module is electrically connected to the second physical interface of the external interface module and the second output terminal of the power supply module; the second ground terminal of the external interface module is electrically connected to the fourth physical interface of the external interface module and the second output terminal of the power supply module; the second ground terminal of the external interface module is also connected to the third physical interface of the external interface module through a switching module; the first physical interface of the external interface module is also connected to the first signal ground; the third physical interface of the external interface module is also connected to the second signal ground. The control terminal of the acoustic-optical driving module is connected to the signal terminal of the external interface module; the power supply terminal of the acoustic-optical driving module is electrically connected to a voltage source; and the ground terminal of the acoustic-optical driving module is connected to the first physical interface and the third physical interface of the external interface module.

2. The 2M cable detection circuit of claim 1, wherein, The power module includes a power supply body, an overcurrent protection unit, and a power control unit. The first end of the power supply body is electrically connected to the input end of the overcurrent protection unit; the output end of the overcurrent protection unit is electrically connected to the input end of the power control unit; the output end of the power control unit serves as the first output end of the power module, outputting a voltage source signal; the second end of the power supply body serves as the second output end of the power module, outputting a ground signal.

3. The 2M cable detection circuit of claim 2, wherein, The power control unit includes a first switching switch; the overcurrent protection unit includes a fuse.

4. The 2M cable detection circuit of claim 2, wherein, The power module further includes a power indicator unit; the first end of the power indicator unit is electrically connected to the output end of the power control unit; and the second end of the power indicator unit is electrically connected to the second end of the power supply body.

5. The 2M cable detection circuit of claim 4, wherein, The power indicator unit includes a first light-emitting diode and a current-limiting resistor; The first terminal of the first light-emitting diode is electrically connected to the first terminal of the current-limiting resistor; the second terminal of the current-limiting resistor is electrically connected to the output terminal of the power control unit. The second terminal of the first light-emitting diode is electrically connected to the second terminal of the power supply body.

6. The 2M cable detection circuit of claim 1, wherein, The acoustic-optical driving module includes a light-emitting driving control unit, a light-emitting unit, a sound-emitting driving control unit, and a buzzer; The control terminal of the light-emitting drive control unit is connected to the signal terminal of the external interface module; the first terminal of the light-emitting drive control unit is electrically connected to the voltage source. The second end of the light-emitting drive control unit is connected to the input end of the light-emitting unit; the second end of the light-emitting drive control unit is also electrically connected through the control end of the sound drive control unit; the first end of the sound drive control unit is electrically connected to the voltage source through the buzzer; the second end of the sound drive control unit is connected to the first physical interface and the third physical interface of the external interface module. The output terminal of the light-emitting unit is connected to the first physical interface and the third physical interface of the external interface module.

7. The 2M cable detection circuit according to claim 6, characterized in that, The light-emitting drive control unit includes a first transistor and a first resistor; The control terminal of the first transistor is connected to the signal terminal of the external interface module; the first terminal of the first transistor is electrically connected to the voltage source; and the second terminal of the first transistor is electrically connected to the light-emitting unit.

8. The 2M cable detection circuit according to claim 7, characterized in that, The light-emitting unit includes a second resistor and a second light-emitting diode; The first end of the second resistor is electrically connected to the second end of the first transistor; the second end of the second resistor is electrically connected to the first end of the second light-emitting diode; the second end of the second light-emitting diode is connected to the first physical interface of the external interface module and the third physical interface of the external interface module.

9. The 2M cable detection circuit of claim 6, wherein, The sound drive control unit includes: a third resistor, a fourth resistor, and a second transistor; The first end of the third resistor is electrically connected to the second end of the light-emitting drive control unit; the second end of the third resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the control terminal of the second transistor; the first end of the second transistor is electrically connected to the voltage source through the buzzer; the second end of the second transistor is connected to the first physical interface of the external interface module and the third physical interface of the external interface module.

10. The 2M cable detection circuit of claim 9, wherein, The sound drive control unit also includes: a filter capacitor; The first terminal of the filter capacitor is electrically connected to the first terminal of the third resistor; the second terminal of the filter capacitor is electrically connected to the second terminal of the second transistor.

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