CN112559416B - Bus communication control method and device and industrial touch screen - Google Patents
Bus communication control method and device and industrial touch screen Download PDFInfo
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- CN112559416B CN112559416B CN202011420325.7A CN202011420325A CN112559416B CN 112559416 B CN112559416 B CN 112559416B CN 202011420325 A CN202011420325 A CN 202011420325A CN 112559416 B CN112559416 B CN 112559416B
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- 238000004891 communication Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004590 computer program Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
- G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/71—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information
- G06F21/73—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information by creating or determining hardware identification, e.g. serial numbers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention discloses a bus communication control method, a bus communication control device and an industrial touch screen. Wherein, all be provided with detachable matching resistor in the arbitrary equipment of carrying on the bus, this method includes: judging whether the equipment is an edge node on the bus or not according to the equipment identification information, wherein each piece of equipment mounted on the bus is provided with a unique equipment identification, and the equipment identification is associated with the position of the equipment on the bus; and controlling the connection or disconnection of the matching resistor of the equipment and the bus according to the judging result. The invention can simply and effectively judge whether the equipment is an edge node based on the equipment identifier related to the equipment position, so that the matching resistor in the equipment communication circuit can be intelligently and autonomously connected or disconnected on the bus according to the position condition of the equipment in the bus, the intelligent disassembly of the matching resistor is realized, the problem that the matching resistor needs to be manually welded in the bus communication network in the prior art is solved, and the reliability and convenience of termination in engineering application are improved.
Description
Technical Field
The invention relates to the technical field of buses, in particular to a bus communication control method and device and an industrial touch screen.
Background
Industrial CAN communication or 485 communication CAN form a multi-node bus communication network, and the bus is required to be connected with a matching resistor to complete impedance matching of the bus so as to achieve the purposes of avoiding signal reflection and improving signal quality.
At present, manual on-site checking of the device position is mostly adopted in industrial use, and if the device is at an initial position or an end position in a bus communication network, a matching resistor is required to be welded for the device manually, so that the method is time-consuming and labor-consuming, and is unfavorable for the reliability of termination of engineering application.
Disclosure of Invention
The embodiment of the invention provides a bus communication control method and device and an industrial touch screen, which are used for at least solving the problem that a bus communication network in the prior art needs manual welding of matching resistors.
In order to solve the above technical problems, an embodiment of the present invention provides a bus communication control method, in which any device mounted on a bus is provided with a detachable matching resistor, the method includes:
Judging whether the equipment is an edge node on a bus or not according to the equipment identification information, wherein each piece of equipment mounted on the bus is provided with a unique equipment identification, and the equipment identification is associated with the position of the equipment on the bus;
And controlling the matching resistor of the equipment to be connected or disconnected with the bus according to the judging result.
Optionally, determining whether the device is an edge node on the bus according to the device identification information includes:
Judging whether the self is an edge node on the bus according to the self equipment identification; or alternatively
And acquiring the device identifiers of other devices on the bus, and judging whether the device is an edge node on the bus according to the device identifiers of the other devices.
Optionally, the matching resistor and the switch unit are all arranged in any device, a first end of the switch unit is connected to the first communication line of the bus, a second end of the switch unit is connected to the first end of the matching resistor, and a second end of the matching resistor is connected to the second communication line of the bus.
Optionally, controlling the matching resistor of the device to be connected or disconnected with the bus according to the judging result includes:
If the switching unit is an edge node on the bus, the switching unit is controlled to be closed so as to enable the matching resistor of the equipment to be conducted with the bus;
And if the switching unit is not an edge node on the bus, controlling the switching unit to be opened so as to disconnect the matching resistance of the equipment from the bus.
Optionally, the device identification may be changed.
The embodiment of the invention also provides a bus communication control device, wherein any device mounted on the bus is internally provided with a detachable matching resistor, and the device comprises:
The judging module is used for judging whether the equipment is an edge node on the bus according to the equipment identification information, wherein each piece of equipment mounted on the bus is provided with a unique equipment identification, and the equipment identification is associated with the position of the equipment on the bus;
and the control module is used for controlling the connection or disconnection of the self matching resistor of the equipment and the bus according to the judging result.
The embodiment of the invention also provides an industrial touch screen, which comprises: according to the bus communication control device provided by the embodiment of the invention, the detachable matching resistor is arranged in the industrial touch screen.
Optionally, a matching resistor and a switch unit are disposed in the industrial touch screen, a first end of the switch unit is connected to a first communication line of the bus, a second end of the switch unit is connected to a first end of the matching resistor, and a second end of the matching resistor is connected to a second communication line of the bus.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the bus communication control method according to the embodiment of the invention.
The embodiment of the invention also provides electronic equipment, which comprises: one or more processors; and a memory for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the bus communication control method according to the embodiment of the present invention.
By applying the technical scheme of the invention, the detachable matching resistor is arranged in any device mounted on the bus, each device mounted on the bus has a unique device identifier, the device identifier is associated with the position of the device on the bus, whether the device is an edge node on the bus or not is judged according to the device identifier information, and the matching resistor of the device is controlled to be connected or disconnected with the bus according to the judging result. Based on the equipment identification associated with the equipment position, whether the equipment is an edge node can be simply and effectively judged, so that the matching resistor in the equipment communication circuit can be intelligently and autonomously connected or disconnected on the bus according to the position condition of the equipment in the bus, the intelligent disassembly of the matching resistor is realized, the problem that the matching resistor needs to be manually welded in the bus communication network in the prior art is solved, and the reliability and convenience of termination in engineering application are improved.
Drawings
FIG. 1 is a flow chart of a bus communication control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of device communication according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a matching resistor module according to an embodiment of the present invention;
Fig. 4 is a flow chart of a bus communication control method according to an embodiment of the present invention;
fig. 5 is a block diagram of a bus communication control device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a bus communication control method, which can intelligently and autonomously control connection and disconnection of a matching resistor according to requirements.
Fig. 1 is a flowchart of a bus communication control method according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
s101, judging whether the equipment is an edge node on a bus according to the equipment identification information, wherein each piece of equipment mounted on the bus is provided with a unique equipment identification, and the equipment identification is associated with the position of the equipment on the bus.
S102, controlling the connection or disconnection of the matching resistor of the equipment and the bus according to the judging result.
The edge node on the bus refers to equipment in an initial position or an end position in the bus communication network, and the edge node needs to be connected with a matching resistor to perform line impedance matching so as to achieve the purposes of avoiding signal reflection and improving bus communication quality.
The device identifier is configured for each device according to a preset configuration rule, and the device identifier is associated with the position of the device on the bus, so that whether the device is an edge node on the bus can be simply and effectively determined through the device identifier information. The preset configuration rule includes a correspondence between device identifiers and device locations, for example, the device identifiers are configured one by one according to a rule of increasing numbers starting from 1, and the device with the smallest device identifier and the largest device identifier is the edge node. When the equipment is connected to the bus, equipment identification is configured for the equipment according to a preset configuration rule, and whether the equipment is an edge node can be effectively determined by regularly configuring the equipment identification, so that guarantee is provided for reliable control of on-off of the matched resistor. Preferably, the device identification may be a device address.
And controlling the connection or disconnection of the matching resistor of the equipment and the bus according to the judging result, wherein the method comprises the following steps: if the node is the edge node, the matching resistor of the control equipment is conducted with the bus; if the node is not the edge node, the matching resistor of the control device is disconnected from the bus. The bus may be a CAN bus or an RS485 bus, etc.
According to the bus communication control method, detachable matching resistors are arranged in any device mounted on the bus, each device mounted on the bus is provided with a unique device identifier, the device identifier is associated with the position of the device on the bus, whether the device is an edge node on the bus or not is judged according to the device identifier information, and the matching resistor of the device is controlled to be connected or disconnected with the bus according to a judging result. Based on the equipment identification associated with the equipment position, whether the equipment is an edge node can be simply and effectively judged, so that the matching resistor in the equipment communication circuit can be intelligently and autonomously connected or disconnected on the bus according to the position condition of the equipment in the bus, the intelligent disassembly of the matching resistor is realized, the problem that the matching resistor needs to be manually welded in the bus communication network in the prior art is solved, and the reliability and convenience of termination in engineering application are improved.
In one embodiment, determining whether the device itself is an edge node on the bus according to the device identification information includes: judging whether the self is an edge node on the bus according to the self equipment identification; or acquiring the device identifiers of other devices on the bus, and judging whether the device is an edge node on the bus according to the device identifiers of the device and the device identifiers of other devices.
The device identification information used for judging whether the edge node is an own device identification or not can be all the device identifications on the bus, and the specific use of what information is used for judging depends on the specific configuration situation of the device identifications. If the device identifier includes information capable of directly determining the position of the device on the bus, if the device identifier includes the total number of devices on the bus, whether the device is an edge node or not can be directly determined according to the device identifier, for example, the device identifier is configured to be 1-100, which means that the device is the 1 st device in 100 devices mounted on the bus and belongs to the edge node; the device identifier is configured to be 50-100, which means that the device is the 50 th device in 100 devices mounted on the bus and does not belong to an edge node; the device identifier is configured to be 100-100, which means that the device is the 100 th device in 100 devices mounted on the bus, and belongs to the edge node. If the device identifier does not contain information capable of directly determining the position of the device on the bus, all the device identifiers on the bus can be synthesized, and whether the device is an edge node can be determined through comparison analysis, for example, the device acquires 99 device identifiers on the bus, adds self device identifiers to the 99 device identifiers, and totally adds 100 device identifiers, and based on a preset configuration rule, the devices with the device identifiers of 1 and 100 are known to be edge nodes.
According to the embodiment, based on the equipment identification configured for the equipment on the bus according to the preset configuration rule, whether the equipment is an edge node can be effectively determined, and guarantee is provided for reliable control of on-off of the matched resistor.
In one embodiment, a matching resistor and a switching unit are arranged in any device on the bus, a first end of the switching unit is connected to a first communication line of the bus, a second end of the switching unit is connected to a first end of the matching resistor, and a second end of the matching resistor is connected to a second communication line of the bus. That is, the matching resistor and the switching unit are connected in series between two communication lines of the bus. The transmission signal lines of the bus are a pair of differential wires, and the impedance is generally fixed, for example, 120 Ω by default, so that the resistance value of the matching resistor set in the device may also be a fixed value, for example, 120 Ω. In the embodiment, the matching resistor and the switch unit which are connected in series between two communication wires of the bus are arranged in the device, and the switching-off or switching-on of the matching resistor and the bus can be realized by controlling the switching-on and switching-off of the switch unit.
Specifically, the matching resistor and the switching unit may be disposed in a communication circuit of the device, where the communication circuit of the device includes a bus communication transceiver for communication protocol conversion, such as a CAN/485 communication transceiver. The matching resistor and the switch unit are connected between the bus communication transceiver and other bus equipment, so that the matching resistor and the bus can be ensured to be matched with line impedance when being conducted, and signal reflection is prevented.
Referring to fig. 2 and 3, taking an industrial touch screen as an example, the industrial touch screen is mounted on a bus, the industrial touch screen includes: a Main Controller (MCU) 10, a CAN/485 communication transceiver 20, a matching resistor module 30 and a bus node detection module 40. The CAN communication and the RS485 communication have respective communication protocols, and in general, when the equipment on the bus and the main controller are in data communication, a CAN/485 transceiver for communication protocol conversion is added in the middle, so that the main controller and the equipment on the bus CAN normally communicate. A matching resistor module 30 and a bus node detection module 40 are added between the CAN/485 communication transceiver 20 and the bus device. The matching resistor module 30 is connected between two communication lines (i.e., communication line a and communication line B) of the bus, and the bus node detection module 40 is also connected between the communication line a and the communication line B. The main controller 10 is used for processing information, the CAN/485 communication transceiver 20 is used for performing communication protocol conversion, the matching resistor module 30 comprises a matching resistor 31 and a switch unit 32, the bus node detection module 40 is used for judging whether the equipment is an edge node on a bus or not, and sending a control signal to the switch unit 32 according to a judging result so as to realize the on or off of the matching resistor.
In one embodiment, controlling the connection or disconnection of the matching resistor of the device itself and the bus according to the determination result includes: if the device is an edge node on the bus, the switch unit is controlled to be closed so as to lead the matching resistor of the device to be conducted with the bus; if not, the switch unit is controlled to be turned off so as to disconnect the matching resistor of the device from the bus. In this embodiment, if the device is an edge node on the bus, a matching resistor needs to be connected to perform line impedance matching, so as to prevent signal reflection, specifically, the matching resistor can be connected to the bus by closing the switch unit, so that normal connection and communication of the bus are ensured; if the equipment is not an edge node on the bus, the matching resistor is not required to be connected, and the matching resistor can be realized by disconnecting the switch unit and is not connected into the bus, so that the normal connection and communication of the bus are ensured.
In consideration of the possible change of the position of the device on the bus, in one embodiment, the device identifier may be changed, that is, after the worker changes the position of the device according to the actual requirement, the device identifier of the device may be correspondingly modified according to the preset configuration rule, that is, the device identifier of the device is associated with the latest position of the device, so that the reliability of controlling the intelligent on-off of the matching resistor based on the device identifier can be ensured.
Alternatively, the device may be an industrial touch screen.
Referring to fig. 4, the bus communication control method based on fig. 2 and 3 includes the steps of:
s401, a bus node detection module detects equipment conditions.
S402, judging whether the equipment belongs to an edge node on a communication bus, if so, entering S403, and if not, entering S405. For the determination of the edge node reference is made to the description in the above embodiments.
S403, the bus node detection module sends a first control signal to the matching resistance module.
S404, a switch unit in the matching resistor module is closed, so that the matching resistor is connected into a communication circuit.
S405, the bus node detection module sends a second control signal to the matching resistance module.
S406, a switch unit in the matching resistor module is disconnected, so that the matching resistor is not connected into the communication circuit.
S407, normal connection of the communication bus is realized.
The embodiment provides a control scheme that matching resistor in equipment communication circuit CAN intelligent dismouting, through the detection to equipment position, the switching on and off of the matching resistor module between two communication lines is controlled for the matching resistor in the CAN communication circuit or the 485 communication circuit of equipment CAN be according to the position condition of equipment in the bus, connect or disconnect on the bus voluntarily intelligently, has solved the problem that equipment CAN/485 communication needs manual dismouting matching resistor, reliability and the convenience of terminating when improving engineering application.
Based on the same inventive concept, the present embodiment provides a bus communication control device, which may be used to implement the bus communication control method described in the foregoing embodiments. The apparatus may be implemented in software and/or hardware. And a detachable matching resistor is arranged in any equipment mounted on the bus.
Fig. 5 is a block diagram of a bus communication control device according to an embodiment of the present invention, as shown in fig. 5, where the device includes:
A judging module 51, configured to judge whether the device is an edge node on the bus according to the device identifier information, where each device mounted on the bus has a unique device identifier, and the device identifier is associated with a position of the device on the bus;
and the control module 52 is used for controlling the connection or disconnection of the matching resistor of the equipment and the bus according to the judging result.
Optionally, the judging module 51 is specifically configured to:
Judging whether the self is an edge node on the bus according to the self equipment identification; or alternatively
And acquiring the device identifiers of other devices on the bus, and judging whether the device is an edge node on the bus according to the device identifiers of the device and the device identifiers of the other devices.
Optionally, the matching resistor and the switch unit are all arranged in any device, a first end of the switch unit is connected to a first communication line of the bus, a second end of the switch unit is connected to a first end of the matching resistor, and a second end of the matching resistor is connected to a second communication line of the bus.
Optionally, the control module 52 is specifically configured to:
if the device is an edge node on the bus, the switch unit is controlled to be closed so as to lead the matching resistor of the device to be conducted with the bus;
If not, the switch unit is controlled to be turned off so as to disconnect the matching resistor of the device from the bus.
Alternatively, the device identification may be altered.
The device can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be referred to the method provided in the embodiment of the present invention.
The embodiment of the invention also provides an industrial touch screen, which comprises: according to the bus communication control device of the embodiment, the detachable matching resistor is arranged in the industrial touch screen.
Specifically, a matching resistor and a switch unit are arranged in the industrial touch screen, a first end of the switch unit is connected to a first communication line of the bus, a second end of the switch unit is connected to a first end of the matching resistor, and a second end of the matching resistor is connected to a second communication line of the bus.
The embodiment of the present invention also provides a computer readable storage medium having a computer program stored thereon, wherein the program when executed by a processor implements the bus communication control method described in the above embodiment.
An embodiment of the present invention provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to implement the bus communication control method according to the above embodiment.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A bus communication control method is characterized in that any device mounted on a bus is provided with a detachable matching resistor, and the method comprises the following steps:
Judging whether the equipment is an edge node on a bus or not according to the equipment identification information, wherein each piece of equipment mounted on the bus is provided with a unique equipment identification, the equipment identification is related to the position of the equipment on the bus, and the edge node on the bus refers to equipment in an initial position or an end position in a bus communication network;
Controlling the connection or disconnection of the self matching resistor of the equipment and the bus according to the judgment result;
judging whether the equipment is an edge node on a bus according to the equipment identification information, comprising:
if the device identifier contains information capable of directly determining the position of the device on the bus, judging whether the device is an edge node on the bus or not directly according to the device identifier of the device; or alternatively
If the device identifier does not contain the information capable of directly determining the position of the device on the bus, the device identifiers of other devices on the bus are obtained, and whether the device identifier is an edge node on the bus is judged according to the device identifier of the device identifier and the device identifiers of the other devices.
2. The method of claim 1, wherein a matching resistor and a switching unit are provided in any of the devices, a first terminal of the switching unit being connected to a first communication line of the bus, a second terminal of the switching unit being connected to a first terminal of the matching resistor, and a second terminal of the matching resistor being connected to a second communication line of the bus.
3. The method according to claim 2, wherein controlling the matching resistance of the device itself to be on or off from the bus according to the determination result comprises:
If the switching unit is an edge node on the bus, the switching unit is controlled to be closed so as to enable the matching resistor of the equipment to be conducted with the bus;
And if the switching unit is not an edge node on the bus, controlling the switching unit to be opened so as to disconnect the matching resistance of the equipment from the bus.
4. A method according to any one of claims 1 to 3, wherein the device identity is modifiable.
5. A bus communication control device, characterized in that detachable matching resistors are arranged in any device mounted on a bus, the device comprises:
The device comprises a judging module, a judging module and a judging module, wherein the judging module is used for judging whether the device is an edge node on a bus according to the device identification information, each device mounted on the bus is provided with a unique device identification, the device identification is associated with the position of the device on the bus, and the edge node on the bus refers to the device at the initial position or the tail end position in a bus communication network;
The control module is used for controlling the connection or disconnection of the self matching resistor of the equipment and the bus according to the judgment result;
The judging module is specifically configured to: if the device identifier contains information capable of directly determining the position of the device on the bus, judging whether the device is an edge node on the bus or not directly according to the device identifier of the device; or if the device identifier does not contain the information capable of directly determining the position of the device on the bus, acquiring the device identifiers of other devices on the bus, and judging whether the device is an edge node on the bus according to the device identifier of the device and the device identifiers of other devices.
6. An industrial touch screen, comprising: the bus communication control device of claim 5, wherein a detachable matching resistor is provided in the industrial touch screen.
7. The industrial touch screen of claim 6, wherein a matching resistor and a switching unit are disposed within the industrial touch screen, a first end of the switching unit is connected to a first communication line of the bus, a second end of the switching unit is connected to a first end of the matching resistor, and a second end of the matching resistor is connected to a second communication line of the bus.
8. A computer-readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the bus communication control method according to any one of claims 1 to 4.
9. An electronic device, comprising: one or more processors; a memory for storing one or more programs, which when executed by the one or more processors, cause the one or more processors to implement the bus communication control method of any of claims 1 to 4.
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| CN207408939U (en) * | 2017-09-12 | 2018-05-25 | 新华三技术有限公司 | Bus impedance coalignment, node device and bus system |
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| JP3696471B2 (en) * | 2000-03-09 | 2005-09-21 | 株式会社オートネットワーク技術研究所 | Information power management device |
| EP2721783B1 (en) * | 2011-06-15 | 2019-05-01 | Osram Sylvania Inc. | Systems and methods to detect bus network fault and topology |
| CN102387059A (en) * | 2011-10-25 | 2012-03-21 | 中国西电电气股份有限公司 | Method and device for carrying out automatic matching on field bus terminals |
| CN205593622U (en) * | 2016-01-18 | 2016-09-21 | 贵州大学 | Many pans of steelyard high accuracy electronic scale controlling means based on zigBee technique |
| CN107356802B (en) * | 2017-07-03 | 2020-02-28 | 珠海格力电器股份有限公司 | Self-test circuit and circuit self-test method |
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| CN207408939U (en) * | 2017-09-12 | 2018-05-25 | 新华三技术有限公司 | Bus impedance coalignment, node device and bus system |
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