Method for functional testing of interfaces for ddc controllers

Abstract

The application discloses a function test method for an interface of a DDC controller, the interface comprising a plurality of output interfaces and a plurality of input interfaces, each of the output interfaces and the input interfaces having at least one transmissible signal type, the method comprising the steps of: connecting the output interfaces to the input interfaces; controlling the output interfaces to output test signals matching the signal types to the input interfaces, judging whether output signals of the input interfaces are the same as or corresponding to the test signals; when the output signals are the same as or corresponding to the test signals, determining that the output interfaces and the input interfaces support the signal types corresponding to the test signals; and when the output signals are neither the same as nor corresponding to the test signals, determining that the output interfaces and the input interfaces do not support the signal types corresponding to the test signals. The application can simultaneously verify multiple functions of the output interfaces and the input interfaces, realize internal loop test, reduce dependence on external test equipment, reduce complexity, and reduce manual operation cost.

Description

Technical Field

[0001] This invention relates to the field of smart property management, and more particularly to a method for testing the functionality of an interface for a DDC controller. Background Technology

[0002] In the field of smart property management, building control systems require centralized management and monitoring of various electromechanical equipment within buildings. This equipment includes: air conditioning units, supply and exhaust fans, sump pits and drainage pumps, elevators, power distribution systems, lighting, etc. Among these, the general-purpose DDC controller in the building control system is the central control unit that parses and executes user logic instructions.

[0003] The inventors discovered that existing general-purpose DDC controllers have numerous interfaces to control or monitor different types of actuators or sensors. To enrich the diversity of interface access and increase interface utilization, the same interface of the DDC controller also reuses interface functions. This makes the testing and verification of hardware functions more cumbersome and complex, specifically in the following two aspects: First, testing all interfaces requires a large number of peripheral devices to achieve functional verification. Second, reused functions require manual switching, which leads to a large number of switching operations due to the large number of reused functions, resulting in poor operability, easy errors, low production efficiency, long testing time, and high labor costs. Summary of the Invention

[0004] This invention provides a functional testing method for the interface of a DDC controller, aiming to solve the problems of low efficiency, high cost, and error susceptibility caused by the need for a large number of peripheral devices and manual operation in the testing of DDC controllers.

[0005] The technical solution is as follows:

[0006] A functional testing method for the interface of a DDC controller is provided.

[0007] The interface includes multiple output interfaces and multiple input interfaces, each output interface and input interface having at least one transceiver signal type, and the method includes the following steps:

[0008] Connect the output interface to the input interface;

[0009] The control output interface outputs a test signal matching the signal type to the input interface, and determines whether the output signal of the input interface is the same as or corresponds to the test signal;

[0010] When the output signal is the same as or corresponds to the test signal, determine the signal type that the output interface and input interface support for the test signal.

[0011] When the output signal is neither the same as nor corresponds to the test signal, it is determined that the output interface and input interface do not support the signal type corresponding to the test signal.

[0012] Furthermore, the output interface includes a digital output interface BO, and the input interface includes a digital input interface BI. The method includes the following steps:

[0013] Connect the digital output interface BO to the digital input interface BI;

[0014] The digital output interface BO outputs a digital signal to the digital input interface BI, and the system determines whether the level signal output by the digital input interface BI is the same as or corresponds to the digital signal.

[0015] Furthermore, the output interface also includes a configurable output interface VO and / or an analog output interface AO, and the input interface also includes a general-purpose input interface UI. The method includes the following steps:

[0016] Connect a digital output interface BO to the control terminal of multiple multi-channel relays;

[0017] One end of the contacts of the multi-channel relay is connected to the configurable output interface VO and / or the analog output interface AO, and the ground terminal of the configurable output interface VO and / or the analog output interface AO, respectively. One end of the normally open contact of the multi-channel relay is connected to the universal input interface UI and the ground terminal of the universal input interface UI, thereby realizing the switching connection between the configurable output interface VO and / or the analog output interface AO and the universal input interface UI. When the contacts are closed, the configurable output interface VO and / or the analog output interface AO are connected to the universal input interface UI. When the contacts are open, the configurable output interface VO and / or the analog output interface AO are disconnected from the universal input interface UI.

[0018] Set the configurable output interface VO and / or analog output interface AO to voltage output mode, set the general-purpose input interface UI to voltage input mode, and control the contact closure of the multi-channel relay through the digital output interface BO, thereby enabling the configurable output interface VO and / or analog output interface AO to conduct with the general-purpose input interface UI.

[0019] Control the configurable output interface VO and / or analog output interface AO to output voltage signals to the general-purpose input interface UI, and determine whether the voltage signal output by the general-purpose input interface UI is the same as or corresponds to the voltage signal output by the configurable output interface VO and / or analog output interface AO.

[0020] Furthermore, the method includes the following steps:

[0021] Connect a digital output interface BO to the control terminal of multiple multi-channel relays;

[0022] Connect one end of the contacts of the multi-channel relay to the general-purpose input interface (UI) and its ground terminal, respectively. Connect one end of the normally open contacts of the multi-channel relay to an external test resistor, thereby achieving a switching connection between the general-purpose input interface (UI) and the external test resistor. When the contacts are closed, the general-purpose input interface (UI) is connected to the external test resistor; when the contacts are open, the general-purpose input interface (UI) is disconnected from the external test resistor.

[0023] Set the general-purpose input interface (UI) to resistance input mode, and control the contact closure of the multi-channel relay through the digital output interface (BO), thereby enabling the general-purpose input interface (UI) to conduct with the external test resistor.

[0024] Detect the input resistance of the general-purpose input interface (UI) output and determine whether the input resistance is the same as the external test resistor.

[0025] Furthermore, a configurable output interface VO is connected to the control terminal of multiple multi-channel relays;

[0026] One end of the contacts of the multi-channel relay is connected to the universal input interface UI, and one end of the normally open contacts of the multi-channel relay is connected to the ground terminal of the universal input interface UI; thus realizing the switching connection between the universal input interface UI and the ground terminal; wherein, when the contacts are closed, the universal input interface UI is connected to the ground terminal of the universal input interface UI, and when the contacts are open, the universal input interface UI is disconnected from the ground terminal of the universal input interface UI;

[0027] Set the configurable output interface VO to digital output mode and the general-purpose input interface UI to digital input mode. Control the contact closure of the multi-channel relay through the configurable output interface VO, thereby making the ground terminal of the configurable output interface VO and the general-purpose input interface UI connected.

[0028] Control the configurable output interface VO to output a digital signal to the general-purpose input interface UI, and determine whether the digital signal output by the general-purpose input interface UI is the same as or corresponds to the digital signal output by the configurable output interface VO.

[0029] Furthermore, a configurable output interface VO is connected to the control terminal of multiple multi-channel relays;

[0030] One end of the contacts of the multi-channel relay is connected to the analog output interface AO and the ground terminal of the analog output interface AO, respectively. One end of the normally open contact of the multi-channel relay is connected to the universal input interface UI and the ground terminal of the universal input interface UI, respectively, thereby realizing the switching connection between the analog output interface AO and the universal input interface UI. When the contacts are closed, the analog output interface AO and the universal input interface UI are connected; when the contacts are open, the analog output interface AO and the universal input interface UI are disconnected.

[0031] Set the configurable output interface VO to digital output mode, the analog output interface AO to current output mode, and the general-purpose input interface UI to current input mode. Control the closing of the contacts of the multi-channel relay through the configurable output interface VO, thereby enabling the analog output interface AO and the general-purpose input interface UI to conduct.

[0032] Control the analog output interface AO to output a current signal to the general-purpose input interface UI, and determine whether the input current signal of the general-purpose input interface UI is the same as or corresponds to the output current signal of the analog output interface AO.

[0033] Furthermore, the multi-channel relay is a 4-channel relay.

[0034] Furthermore, after the test is completed, the contacts of the control multi-channel relay are disconnected.

[0035] The beneficial effects of this invention are: by connecting the output interface of the DDC controller to the input interface, controlling the output interface to output multiple signals to the input interface, and verifying multiple functions of the output and input interfaces, internal loopback testing can be achieved, which can reduce reliance on external testing equipment, reduce complexity, and reduce manual operation costs. Attached Figure Description

[0036] Figure 1 This is a flowchart of an embodiment of the functional testing method for the interface of a DDC controller according to the present invention;

[0037] Figure 2 This is a schematic diagram of a circuit structure according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of a circuit structure according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of a circuit structure according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of a circuit structure according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the circuit structure according to an embodiment of the present invention. Detailed Implementation

[0042] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0043] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0044] like Figure 1 As shown, this invention provides a functional testing method for an interface of a DDC controller. The interface includes multiple output interfaces and multiple input interfaces, each output interface and input interface having at least one transceiver signal type. The method includes the following steps:

[0045] Connect the output interface to the input interface;

[0046] The control output interface outputs a test signal matching the signal type to the input interface, and determines whether the output signal of the input interface is the same as or corresponds to the test signal;

[0047] When the output signal is the same as or corresponds to the test signal, determine the signal type that the output interface and input interface support for the test signal.

[0048] When the output signal is neither the same as nor corresponds to the test signal, it is determined that the output interface and input interface do not support the signal type corresponding to the test signal.

[0049] The output interfaces are categorized into several types based on the type of signal they can output, such as digital, analog, and configurable types. Similarly, the input interfaces are also categorized based on the type of signal they can receive, including digital, analog, and configurable types. Digital output interfaces output digital signals, analog output interfaces output analog signals, and configurable output interfaces can be set to output either digital or analog signals. Likewise, digital input interfaces receive digital signals, analog input interfaces receive analog signals, and configurable input interfaces can be set to receive either digital or analog signals.

[0050] Accordingly, when connecting an output interface to an input interface, you must select the interface that matches the signal type. For example, a digital output interface should be connected to a digital input interface, and an analog output interface should be connected to an analog input interface.

[0051] Furthermore, when a configurable output interface is connected to a digital input interface, the configurable output interface is set to digital output mode accordingly; when a configurable output interface is connected to an analog input interface, the configurable output interface is set to analog output mode accordingly.

[0052] Furthermore, when a digital output interface is connected to a configurable input interface, the configurable input interface is set to digital input mode accordingly; when an analog output interface is connected to a configurable input interface, the configurable input interface is set to analog input mode accordingly.

[0053] Furthermore, when connecting a configurable output interface to a configurable input interface, the following operations are performed accordingly:

[0054] Set the configurable output interface to digital output mode and the configurable input interface to digital input mode.

[0055] Alternatively, the configurable output interface can be set to analog output mode, while the configurable input interface can be set to analog input mode.

[0056] Specifically, referring to Table 1, which defines the interface specifications of an embodiment of the DDC controller of this application, the DDC controller has multiple digital / analog interfaces such as BI, BO, UI, VO, and AO. BI refers to a digital input interface; BO refers to a digital output interface; UI refers to a general-purpose input interface, which can connect to four types of input devices: 0-10V voltage-type analog signal input devices, 4-20mA current-type analog signal input devices, resistive analog signal input devices, and digital signal input devices; VO refers to a configurable output interface, which can output both 0-10V voltage-type analog signals and digital signals; and AO refers to an analog signal output interface, which can output both 0-10V voltage-type analog signals and 4-20mA current-type analog signals.

[0057] Table 1

[0058]

[0059] Furthermore, the output interface includes a digital output interface BO, and the input interface includes a digital input interface BI. The method includes the following steps:

[0060] Connect the digital output interface BO to the digital input interface BI;

[0061] The digital output interface BO outputs a digital signal to the digital input interface BI, and the system determines whether the level signal output by the digital input interface BI is the same as or corresponds to the digital signal.

[0062] Specifically, refer to Figure 2, Figure 2 This is a schematic diagram of a circuit structure according to an embodiment of this application. Figure 2 As shown, loopback testing of digital signals via the BO-BI interface can be performed. Since both the BO1 and BI7 / BI8 interfaces can only process single-function digital signals, the BO1 interface can be directly connected to the BI7 and BI8 interfaces. The digital signal output from the BO1 interface can then be sent to the BI7 / BI8 interfaces to control the signal level conversion of the BI7 / BI8 interfaces. This connection can simultaneously verify the functionality of both the BO1 and BI7 / BI8 interfaces.

[0063] Furthermore, the output interface also includes a configurable output interface VO and / or an analog output interface AO, and the input interface also includes a general-purpose input interface UI. The method includes the following steps:

[0064] Connect a digital output interface BO to the control terminal of multiple multi-channel relays;

[0065] One end of the contacts of the multi-channel relay is connected to the configurable output interface VO and / or the analog output interface AO, and the ground terminal of the configurable output interface VO and / or the analog output interface AO, respectively. One end of the normally open contact of the multi-channel relay is connected to the universal input interface UI and the ground terminal of the universal input interface UI, thereby realizing the switching connection between the configurable output interface VO and / or the analog output interface AO and the universal input interface UI. When the contacts are closed, the configurable output interface VO and / or the analog output interface AO are connected to the universal input interface UI. When the contacts are open, the configurable output interface VO and / or the analog output interface AO are disconnected from the universal input interface UI.

[0066] Set the configurable output interface VO and / or analog output interface AO to voltage output mode, set the general-purpose input interface UI to voltage input mode, and control the contact closure of the multi-channel relay through the digital output interface BO, thereby enabling the configurable output interface VO and / or analog output interface AO to conduct with the general-purpose input interface UI.

[0067] Control the configurable output interface VO and / or analog output interface AO to output voltage signals to the general-purpose input interface UI, and determine whether the voltage signal output by the general-purpose input interface UI is the same as or corresponds to the voltage signal output by the configurable output interface VO and / or analog output interface AO.

[0068] Specifically, refer to Figure 3 , Figure 3 This is a schematic diagram of a circuit structure according to an embodiment of this application. Figure 3As shown, voltage mode loopback testing of the VO / AO-UI interface can be performed. Three 4-channel relay switching contacts are controlled via the BO2 interface. One end of each contact is connected to the VO / AO interface output signal and the output interface's ground terminal, respectively. The other end of the normally open contact is connected to the UI interface input signal and the input interface's ground terminal. The VO / AO interface is set to voltage output mode, and the UI interface is set to voltage input mode. A digital signal is output through the BO interface to control the relay contacts to close. Then, different voltage signals are output to the UI interface through the VO / AO interface to verify whether the UI interface input voltage signal matches the VO interface output signal. After this mode test is completed, the BO outputs a digital signal to control the relay contacts to open, stopping the voltage mode test. This circuit connection can simultaneously verify the voltage mode functionality of both the VO and UI interfaces.

[0069] Furthermore, the method includes the following steps:

[0070] Connect a digital output interface BO to the control terminal of multiple multi-channel relays;

[0071] Connect one end of the contacts of the multi-channel relay to the general-purpose input interface (UI) and its ground terminal, respectively. Connect one end of the normally open contacts of the multi-channel relay to an external test resistor, thereby achieving a switching connection between the general-purpose input interface (UI) and the external test resistor. When the contacts are closed, the general-purpose input interface (UI) is connected to the external test resistor; when the contacts are open, the general-purpose input interface (UI) is disconnected from the external test resistor.

[0072] Set the general-purpose input interface (UI) to resistance input mode, and control the contact closure of the multi-channel relay through the digital output interface (BO), thereby enabling the general-purpose input interface (UI) to conduct with the external test resistor.

[0073] Detect the input resistance of the general-purpose input interface (UI) output and determine whether the input resistance is the same as the external test resistor.

[0074] Specifically, refer to Figure 4 , Figure 4 This is a schematic diagram of a circuit structure according to an embodiment of this application. Figure 4 As shown, a UI interface resistance mode test can be performed. The BO3 interface controls three 4-channel relay switching contacts. One end of each contact is connected to the UI interface input signal and the input interface ground terminal, respectively. The other end of the normally open contact is connected to an external test resistor. The UI interface is set to resistance input mode, and the BO3 interface controls the relay contacts to close. The input resistance value is then checked through the UI interface to verify its consistency with the actual externally connected resistor value. After this mode test is completed, the BO3 controls the relay contacts to open, stopping the UI resistance mode test. This circuit connection can verify the resistance mode function of the UI interface.

[0075] Furthermore, a configurable output interface VO is connected to the control terminal of multiple multi-channel relays;

[0076] One end of the contacts of the multi-channel relay is connected to the universal input interface UI, and one end of the normally open contacts of the multi-channel relay is connected to the ground terminal of the universal input interface UI; thus realizing the switching connection between the universal input interface UI and the ground terminal; wherein, when the contacts are closed, the universal input interface UI is connected to the ground terminal of the universal input interface UI, and when the contacts are open, the universal input interface UI is disconnected from the ground terminal of the universal input interface UI;

[0077] Set the configurable output interface VO to digital output mode and the general-purpose input interface UI to digital input mode. Control the contact closure of the multi-channel relay through the configurable output interface VO, thereby making the ground terminal of the configurable output interface VO and the general-purpose input interface UI connected.

[0078] Control the configurable output interface VO to output a digital signal to the general-purpose input interface UI, and determine whether the digital signal output by the general-purpose input interface UI is the same as or corresponds to the digital signal output by the configurable output interface VO.

[0079] Specifically, refer to Figure 5 , Figure 5 This is a schematic diagram of a circuit structure according to an embodiment of this application. Figure 5 As shown, a VO-UI interface digital signal loopback test can be performed. The VO4 interface's digital output mode controls a 4-channel relay and a 2-channel relay toggle switch. One end of each contact is connected to the UI interface input signal, and the other end of the normally open contact is connected to the UI interface ground signal. With VO4 set to digital output mode and UI set to digital input mode, VO4 controls the relay contacts to close, verifying whether the digital signal detected by the UI interface matches the actual digital signal output by VO4. After this mode test is completed, VO4 controls the relay contacts to open, stopping the digital mode test. This connection can simultaneously verify the digital mode functionality of both the VO and UI interfaces.

[0080] Furthermore, a configurable output interface VO is connected to the control terminal of multiple multi-channel relays;

[0081] One end of the contacts of the multi-channel relay is connected to the analog output interface AO and the ground terminal of the analog output interface AO, respectively. One end of the normally open contact of the multi-channel relay is connected to the universal input interface UI and the ground terminal of the universal input interface UI, respectively, thereby realizing the switching connection between the analog output interface AO and the universal input interface UI. When the contacts are closed, the analog output interface AO and the universal input interface UI are connected; when the contacts are open, the analog output interface AO and the universal input interface UI are disconnected.

[0082] Set the configurable output interface VO to digital output mode, the analog output interface AO to current output mode, and the general-purpose input interface UI to current input mode. Control the closing of the contacts of the multi-channel relay through the configurable output interface VO, thereby enabling the analog output interface AO and the general-purpose input interface UI to conduct.

[0083] Control the analog output interface AO to output a current signal to the general-purpose input interface UI, and determine whether the input current signal of the general-purpose input interface UI is the same as or corresponds to the output current signal of the analog output interface AO.

[0084] Specifically, refer to Figure 6 , Figure 6 This is a schematic diagram of a circuit structure according to an embodiment of this application. Figure 6 As shown, an AO-UI interface current-mode loopback test can be performed. A 4-channel relay toggle switch is controlled via the digital output mode of the VO5 interface. One end of the contact is connected to the AO interface output signal and the output interface ground, respectively. The other end of the normally open contact is connected to the UI interface input signal and the input interface ground. The VO5 interface is set to digital output mode, the AO interface to current output mode, and the UI interface to current input mode. The VO5 interface controls the relay contacts to close, outputting different current signals to the UI interface through the AO interface, verifying whether the UI input current signal matches the AO output signal. After this mode test is completed, the VO5 interface controls the relay contacts to open, stopping the current-mode test. This connection can simultaneously verify the current-mode functionality of both the AO and UI interfaces.

[0085] Furthermore, the multi-channel relay can be a 4-channel relay, or a 2-channel relay. In mixed test circuits, multi-channel relays can also be used in combination (e.g., Figure 5 (as shown in the image).

[0086] Furthermore, after the test is completed, the contacts of the control multi-channel relay are disconnected.

[0087] In summary, this application has the following beneficial effects: by connecting the output interface of the DDC controller to the input interface; controlling the output interface to output multiple signals to the input interface, and verifying multiple functions of the output and input interfaces, internal loopback testing can be achieved, which can reduce dependence on external testing equipment, reduce complexity, and reduce manual operation costs.

Claims

1. A method for functional testing of an interface of a DDC controller, characterized in that, The interface includes a plurality of output interfaces and a plurality of input interfaces, the output interfaces include: digital output interfaces BO, and the input interfaces include: universal input interfaces UI, each of the output interfaces and the input interfaces has at least one transmissible signal type, and the method includes the steps of: connecting the output interfaces to the input interfaces, wherein one of the digital output interfaces BO is connected to control ends of a plurality of multiplex relays; one end of contacts of the multiplex relays is respectively connected to the universal input interfaces UI and a ground end of the universal input interfaces UI, and one end of normally open contacts of the multiplex relays is respectively connected to external test resistors, so that the universal input interfaces UI are switch-connected to the external test resistors; when the normally open contacts are closed, the universal input interfaces UI are conductive with the external test resistors, and when the normally open contacts are disconnected, the universal input interfaces UI are disconnected from the external test resistors; the universal input interfaces UI are set to a resistance input mode, the normally open contacts of the multiplex relays are controlled to be closed through the digital output interfaces BO, so that the universal input interfaces UI are conductive with the external test resistors; controlling the output interfaces to output test signals matched with the signal types to the input interfaces, and judging whether output signals of the input interfaces are the same as or correspond to the test signals; wherein an input resistance output by the universal input interfaces UI is detected, and whether the input resistance is the same as the external test resistors is judged; when the output signals are the same as or correspond to the test signals, it is determined that the output interfaces and the input interfaces support the signal types corresponding to the test signals; when the output signals are neither the same as nor correspond to the test signals, it is determined that the output interfaces and the input interfaces do not support the signal types corresponding to the test signals.

2. The method of functional testing of an interface for a DDC controller according to claim 1, wherein, The input interfaces include digital input interfaces BI, and the method includes the steps of: connecting the digital output interfaces BO to the digital input interfaces BI; controlling the digital output interfaces BO to output digital signals to the digital input interfaces BI, and judging whether level signals output by the digital input interfaces BI are the same as or correspond to the digital signals.

3. The method of functional testing of an interface for a DDC controller according to claim 2, wherein, The output interfaces further include configurable output interfaces VO and / or analog output interfaces AO, and the method includes the steps of: connecting one of the digital output interfaces BO to control ends of a plurality of multiplex relays; One end of the contact of the multi-relay is connected to the configurable output interface VO and / or analog output interface AO, and the ground end of the configurable output interface VO and / or analog output interface AO, one end of the normally open contact of the multi-relay is connected to the universal input interface UI and the ground end of the universal input interface UI, so as to realize the switch connection of the configurable output interface VO and / or analog output interface AO and the universal input interface UI; wherein, when the normally open contact is closed, the configurable output interface VO and / or analog output interface AO is conducted with the universal input interface UI, and when the normally open contact is disconnected, the configurable output interface VO and / or analog output interface AO is disconnected with the universal input interface UI; The configurable output interface VO and / or analog output interface AO is set to voltage output mode, the universal input interface UI is set to voltage input mode, the normally open contact of the multi-relay is controlled to be closed through the digital output interface BO, so that the configurable output interface VO and / or analog output interface AO is conducted with the universal input interface UI; The voltage signal output by the configurable output interface VO and / or analog output interface AO is controlled to the universal input interface UI, and it is judged whether the voltage signal output by the universal input interface UI is the same as or corresponds to the voltage signal output by the configurable output interface VO and / or analog output interface AO.

4. The functional test method of the interface of the DDC controller according to claim 3, wherein, One configurable output interface VO is connected to the control end of a plurality of multi-relays; One end of the contact of the multi-relay is connected to the universal input interface UI, and one end of the normally open contact of the multi-relay is connected to the ground end of the universal input interface UI, so as to realize the switch connection of the universal input interface UI and the ground end; wherein, when the normally open contact is closed, the universal input interface UI is conducted with the ground end of the universal input interface UI, and when the normally open contact is disconnected, the universal input interface UI is disconnected with the ground end of the universal input interface UI; The configurable output interface VO is set to digital output mode, the universal input interface UI is set to digital input mode, and the normally open contact of the multi-relay is controlled to be closed through the configurable output interface VO, so that the configurable output interface VO is conducted with the ground end of the universal input interface UI; The digital signal output by the configurable output interface VO is controlled to the universal input interface UI, and it is judged whether the digital signal output by the universal input interface UI is the same as or corresponds to the digital signal output by the configurable output interface VO.

5. The functional test method of the interface of the DDC controller according to claim 3, wherein, One configurable output interface VO is connected to the control end of a plurality of multi-relays; One end of the contact of the multi-relay is connected to the analog output interface AO and the ground of the analog output interface AO respectively, one end of the normally open contact of the multi-relay is connected to the universal input interface UI and the ground of the universal input interface UI respectively, so as to realize the switch connection of the analog output interface AO and the universal input interface UI; wherein, when the normally open contact is closed, the analog output interface AO and the universal input interface UI are conducted, and when the normally open contact is disconnected, the analog output interface AO and the universal input interface UI are disconnected; The configurable output interface VO is set to a digital output mode, the analog output interface AO is set to a current output mode, the universal input interface UI is set to a current input mode, the normally open contact of the multi-relay is controlled to be closed through the configurable output interface VO, so that the analog output interface AO and the universal input interface UI are conducted; The analog output interface AO outputs a current signal to the universal input interface UI, and it is judged whether the input current signal of the universal input interface UI is the same as or corresponds to the output current signal of the analog output interface AO.

6. The method of functional testing of an interface for a DDC controller according to claim 3, wherein, The multi-relay is a 4-way relay.

7. The method for functional testing of an interface of a DDC controller according to any one of claims 3 to 6, characterized in that, Further comprising steps: After the test is completed, the normally open contact of the multi-relay is controlled to be disconnected. Further comprising steps: After the test is completed, the normally open contact of the multi-relay is controlled to be disconnected.

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