CN103248529B - Control circuit of communication network matching resistor - Google Patents
Control circuit of communication network matching resistor Download PDFInfo
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- CN103248529B CN103248529B CN201210030523.1A CN201210030523A CN103248529B CN 103248529 B CN103248529 B CN 103248529B CN 201210030523 A CN201210030523 A CN 201210030523A CN 103248529 B CN103248529 B CN 103248529B
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- 238000004891 communication Methods 0.000 title claims abstract description 63
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000003780 insertion Methods 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
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Abstract
The invention discloses a control circuit of a communication network matching resistor. The control circuit includes: the detection unit is used for detecting whether the node of the communication network is a master control machine or not; and the control unit is connected with the detection unit and used for controlling the matched resistor of the communication network to be accessed into the communication network when the node of the communication network is the master control machine. The invention enables the communication network matching resistor to be automatically accessed without manual insertion.
Description
Technical Field
The invention relates to the field of circuits, in particular to a control circuit of a communication network matching resistor.
Background
At present, the installation position of a matching resistor in a communication network needs to be confirmed by debugging or after-sales personnel according to the installed communication network node, and the matching resistor is an electrical component temporarily manufactured and needs to be debugged or kept by the after-sales personnel. In the communication network, if the network is abnormal, debugging or after-sales personnel need to check the matching resistance, the matching resistance is often difficult to find, and the corresponding matching resistance is easy to lose, so how to automatically identify the node and automatically access the matching resistance is promoted.
Aiming at the problem that the communication network matching resistor cannot be automatically accessed in the related technology, an effective solution is not provided at present.
Disclosure of Invention
The invention mainly aims to provide a control circuit of a communication network matching resistor, which is used for solving the problem that the communication network matching resistor cannot be automatically accessed.
In order to achieve the above object, the present invention provides a control circuit for a matching resistor of a communication network.
The control circuit of the communication network matching resistor comprises: the detection unit is used for detecting whether the node of the communication network is a master control machine or not; and the control unit is connected with the detection unit and used for controlling the matched resistor of the communication network to be accessed into the communication network when the node of the communication network is the master control machine.
Further, the communication network is a CAN network.
Further, the detection unit includes: the dial switch of the CAN network main control computer, wherein, when the node of the CAN network is the main control computer, the first end of the dial switch has the first level, when the node of the CAN network is not the main control computer, the first end of the dial switch has the second level, wherein, the first level and the second level are different levels.
Further, the detection unit further includes: the first end of the first switch tube is connected with the first end of the dial switch and is used for conducting when the first end of the dial switch has a first level; and the first end of the second switch tube is connected with the second end of the first switch tube and is used for conducting when the first switch tube is conducted.
Further, the detection unit further includes: the first end of the first resistor is connected with the first end of the dial switch, and the second end of the first resistor is connected with the first end of the first switch tube; the first end of the second resistor is connected to a second node, and the second end of the second resistor is grounded; and the first end of the third resistor is connected to the first node, and the second end of the third resistor is connected with the first end of the second switching tube.
Further, the first level is a low level, and the second level is a high level.
Further, the control unit includes: and the switch module is connected with the second end of the second switch tube and is used for being closed when the second switch tube is switched on so as to enable the matching resistor of the communication network to be connected into the communication network.
Furthermore, the switch module is a relay, wherein the first end of the relay coil is connected with the second end of the second switch tube, the second end of the coil is connected with the power supply, and the relay switch is attracted when the second switch tube is switched on, so that the matching resistor of the communication network is connected into the communication network.
Further, the control unit further includes: and the first end of the diode is connected to a second node, the second end of the diode is connected to a third node, the second node is a node between the second end of the second switching tube and the first end of the relay coil, and the third node is a node between the second end of the relay coil and a power supply.
According to the invention, a control circuit of the communication network matching resistor is adopted, and comprises the following parts: the detection unit is used for detecting whether the node of the communication network is a master control machine or not; and the control unit is connected with the detection unit and used for controlling the matched resistor of the communication network to be accessed into the communication network when the node of the communication network is the master control machine, so that the problem that the matched resistor of the communication network cannot be automatically accessed is solved, and the effect that the matched resistor of the communication network is automatically accessed without manual insertion is further achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a functional block diagram of a control circuit for a communication network matching resistor according to an embodiment of the present invention; and
fig. 2 is a wiring diagram of a control circuit for a communication network matching resistor according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic block diagram of a control circuit of a communication network matching resistor according to an embodiment of the present invention, and as shown in fig. 1, the control circuit includes a detection unit 20 and a control unit 40.
The detection unit 20 is configured to detect whether a node of the communication network is a master controller, and the control unit 40 is connected to the detection unit and configured to control the matching resistor of the communication network to access the communication network when the node of the communication network is the master controller.
Through the control circuit of the embodiment, the matching resistor required by the communication network can be automatically accessed, so that debugging or after-sale personnel debugging and maintenance work is facilitated. The control circuit of the matching resistor provided by this embodiment is added to the node, and when the detection unit 20 identifies the node as the master control machine, the control unit 40 of the control circuit becomes effective, so that the matching resistor is automatically accessed without affecting the whole communication quality.
Normal and reliable operation of communication between CAN networks also requires adding matching resistors to the nodes, and the detection unit 20 preferably includes: the dial switch of CAN network main control computer, wherein, when the dial switch was arranged in the first position, the node of CAN network was the main control computer, and the first end of dial switch has first level, and when the dial switch was arranged in other positions, the node of CAN network was not the main control computer, and the first end of dial switch has the second level, and wherein, first level and second level are different levels. The main control computer of the CAN network is identified through the dial switch, and when the communication network is the CAN network, the matching resistor is automatically accessed in a mode of linkage with the dial switch in consideration of actual use places and installation and debugging.
Fig. 2 is a wiring diagram of a control circuit of a communication network matching resistor according to an embodiment of the present invention, as shown in fig. 2, SWITCH in the diagram is a dial SWITCH SA8, an ON terminal of the dial SWITCH SA8 is connected to a power supply via a resistor R163, and a node is disposed between the ON terminal of the dial SWITCH SA8 and the resistor R163, and the node leads to a first terminal SA8_1 of the dial SWITCH SA 8. When the dial of the dial switch SA8 is at the ON end (i.e. at the first position), the node of the CAN network is the master, and the first end SA8_1 of the dial switch has a low level. Therefore, when the first terminal SA8_1 of the dial switch has a low level, it indicates that the node of the CAN network is the master.
When the communication network is a CAN network, specifically, the wiring diagram of the control circuit of the communication network matching resistor is described as follows: the detection unit 20 includes: the control unit 40 includes a first resistor R162, a first transistor Q11, a second resistor R141, a third resistor R5, and a second transistor Q12: relay K16 and diode D38. Wherein,
a first end of the first resistor R162 is connected to the first end SA8_1 of the dial switch, and a second end is connected to the first end of the first transistor Q11;
a first end of the first triode Q11 is connected with a second end of the first resistor R162, a second end of the first triode Q11 is connected with a first end of the second triode Q12 through a third resistor R5, and a third end of the first triode Q11 is connected with a power supply;
the first end of the second resistor R141 is connected to a first node, and the second end is grounded, wherein the first node is a node between the second end of the first transistor Q11 and the third resistor R5;
a first end of a second triode Q12 is connected with a second end of the first triode Q11, a second end of a second triode Q12 is connected with a first end of a coil of the relay K16, and a third end of the second triode Q12 is grounded;
the first end of a coil of the relay K16 is connected with the second end of the second triode Q12, the second end of the coil is connected with a power supply, the first end of a switch of the relay K16 is connected with the first end CAN _ H of a CAN network node through a matching resistor R107, and the second end of a switch of the relay K16 is connected with the second end CAN _ L of the CAN network node;
the diode D38 has a first terminal connected to a second node, and a second terminal connected to a third node, wherein the second node is a node between the second terminal of the second transistor Q12 and the first terminal of the coil of the relay K16, and the third node is a node between the second terminal of the coil of the relay K16 and the power supply.
The principle of the circuit is explained as follows: the control circuit identifies whether the control circuit is a main control machine or not through the high-low level of the first end SA8_1 of the dial switch, and simultaneously, whether the linkage relay K16 is attracted or not. When a shifting lever of the dial switch SA8 is arranged at an ON end, a first end SA8_1 of the dial switch is at a low level, a first triode Q11 is conducted, a second triode Q12 is conducted, a relay K16 is attracted, and a corresponding matching resistor R107 is automatically connected between CAN _ H and CAN _ L; when a driving lever of the dial switch SA8 is arranged at a digital end (or other ends), the first end SA8_1 end of the dial switch is at a high level, the first triode Q11 is cut off, the second triode Q12 is cut off, the relay K16 is disconnected, and the matching resistor R107 is disconnected between the CAN-H and the CAN-L.
Adopt this control circuit's CAN network, with matching resistance direct mount on control circuit board, need not the assembly in addition, debugging simultaneously or after-sale personnel need not seek matching resistance in the network at which node equipment, the unit installation back, need carry out dial setting on the main control board of unit, set up to main control computer dial switch SA8, when dial switch SA8 sets up to the main control computer, matching resistance takes effect, when non-main control computer, matching resistance is invalid, realized matching resistance automatic access, need not artificial going cartridge.
From the above description, it can be seen that the present invention achieves the following technical effects: the control circuit of the communication network matching resistor enables the communication network matching resistor to be automatically connected without artificial insertion.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A control circuit for a communication network matched resistor, comprising:
the detection unit is used for detecting whether the node of the communication network is a master control machine or not; and
the control unit is connected with the detection unit and used for controlling the matched resistor of the communication network to be accessed into the communication network when the node of the communication network is a master control machine, wherein the communication network is a CAN network;
the detection unit includes: a dial switch of the CAN network master control machine,
wherein, when the node of the CAN network is a master control machine, the first end of the dial switch has a first level, when the node of the CAN network is not the master control machine, the first end of the dial switch has a second level, wherein, the first level and the second level are different levels,
the detection unit further includes:
a first switch tube (Q11), a first terminal of which is connected to the first terminal (SA8_1) of the dial switch, for conducting when the first terminal (SA8_1) of the dial switch has the first level; and
and the first end of the second switching tube (Q12) is connected with the second end of the first switching tube (Q11) and is used for conducting when the first switching tube (Q11) is conducted.
2. The control circuit of the communication network matching resistor of claim 1, wherein the detection unit further comprises:
a first resistor (R162) having a first end connected to the first end (SA8_1) of the dial switch and a second end connected to the first end of the first switch tube (Q11);
a second resistor (R141) having a first end connected to a first node and a second end connected to ground, wherein the first node is a node between the second end of the first switch transistor (Q11) and the first end of the second switch transistor (Q12); and
and a third resistor (R5) having a first end connected to the first node and a second end connected to the first end of the second switch (Q12).
3. The circuit of claim 2, wherein the first level is a low level and the second level is a high level.
4. The control circuit of the communication network matched resistor as claimed in claim 1 or 2, wherein the control unit comprises:
and the switch module is connected with the second end of the second switch tube (Q12) and is used for being closed when the second switch tube (Q12) is conducted, so that the matching resistor of the communication network is connected into the communication network.
5. The control circuit of the communication network matching resistor of claim 4,
the switch module is a relay (K16),
the first end of the coil of the relay (K16) is connected with the second end of the second switch tube (Q12), the second end of the coil is connected with a power supply, and the switch of the relay (K16) is attracted when the second switch tube (Q12) is switched on, so that the matching resistor (R107) of the communication network is connected into the communication network.
6. The control circuit of the communication network matched resistor as recited in claim 5, wherein the control unit further comprises:
and a diode (D38) having a first end connected to a second node and a second end connected to a third node, wherein the second node is a node between the second end of the second switch tube (Q12) and the first end of the coil of the relay (K16), and the third node is a node between the second end of the coil of the relay (K16) and a power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210030523.1A CN103248529B (en) | 2012-02-10 | 2012-02-10 | Control circuit of communication network matching resistor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210030523.1A CN103248529B (en) | 2012-02-10 | 2012-02-10 | Control circuit of communication network matching resistor |
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| CN103248529A CN103248529A (en) | 2013-08-14 |
| CN103248529B true CN103248529B (en) | 2016-12-14 |
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| CN201210030523.1A Active CN103248529B (en) | 2012-02-10 | 2012-02-10 | Control circuit of communication network matching resistor |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713548A (en) * | 2013-12-20 | 2014-04-09 | 中国北方车辆研究所 | Gate control device for bus matched resistor |
| CN104129690B (en) * | 2014-06-19 | 2016-04-13 | 深圳市海浦蒙特科技有限公司 | Elevator communication matched resistance connection control method and system |
| 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 |
| CN108900402A (en) * | 2018-07-23 | 2018-11-27 | 珠海格力电器股份有限公司 | Matching resistor termination control method, device and system |
| CN113176743B (en) * | 2021-03-25 | 2022-11-15 | 四川百纳科技有限责任公司 | CAN network physical layer diagnosis resistance self-adaptive circuit and method |
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| CN1138780A (en) * | 1995-06-20 | 1996-12-25 | 友讯科技股份有限公司 | Device and method for automatic detection and setting of stacked network system terminal resistance |
| CN1670717A (en) * | 2004-03-18 | 2005-09-21 | 联想(北京)有限公司 | Apparatus and method for allocating hardware address in embedded system |
| CN101873108A (en) * | 2009-04-21 | 2010-10-27 | 上海线友电子有限公司 | Terminal resistor automatic match circuit in gas detector |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8289127B2 (en) * | 2007-02-27 | 2012-10-16 | Analog Devices, Inc. | Switching systems |
| US8125291B2 (en) * | 2009-08-26 | 2012-02-28 | Virginia Tech Intellectual Properties, Inc. | Electromagnetic interference noise separator |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1138780A (en) * | 1995-06-20 | 1996-12-25 | 友讯科技股份有限公司 | Device and method for automatic detection and setting of stacked network system terminal resistance |
| CN1670717A (en) * | 2004-03-18 | 2005-09-21 | 联想(北京)有限公司 | Apparatus and method for allocating hardware address in embedded system |
| CN101873108A (en) * | 2009-04-21 | 2010-10-27 | 上海线友电子有限公司 | Terminal resistor automatic match circuit in gas detector |
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