CN104408855A - Two bus loop communication system with bus arbitrator - Google Patents
Two bus loop communication system with bus arbitrator Download PDFInfo
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- CN104408855A CN104408855A CN201410668339.9A CN201410668339A CN104408855A CN 104408855 A CN104408855 A CN 104408855A CN 201410668339 A CN201410668339 A CN 201410668339A CN 104408855 A CN104408855 A CN 104408855A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/08—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using communication transmission lines
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- General Physics & Mathematics (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention provides a two bus loop communication system with a bus arbitrator. The two bus loop communication system with the bus arbitrator comprises a loop card and a plurality of loop units, wherein the loop card is connected with all the loop units, and supplies electricity to all the loop units, the loop card are communicated with all the loop units through electrical level, the loop card comprises an electrical level control circuit, and a constant current output circuit, an electric current compensating circuit and a major node signal processing unit, which are respectively connected with the electrical level control circuit, each loop unit comprises a non-polar circuit, a sourcing current circuit, a current stabilization circuit, a slave node signal processing unit and a slave node electrical level sampling circuit, each non-polar circuit is connected with the electrical level control circuit and the major node signal processing unit, each sourcing current circuit, each current stabilization circuit and each slave node electrical level sampling circuit are all connected with each non-polar circuit, and each slave node signal processing unit is connected with each sourcing current circuit, each current stabilization circuit and each slave node electrical level sampling circuit. The two bus loop communication system with the bus arbitrator solves the technical problem that communication delay is long in two bus communications, and has the advantages of being high in communication speed, low in system delay and high in communication accuracy.
Description
Technical field
The present invention relates to fire-fighting electronic circuit field, particularly, relate to a kind of two lines bus loop communications system with bus arbitration.
Background technology
So-called two line communication refers to that communication bus only has two buses, does not need a kind of communication mode of extra power lead.All communication nodes all by these two buses from communication host node power taking and communicating with host node.In fire alarm control unit field, nearly all intelligent point type fire detector and the communication of fire alarm control unit are all two lines bus circuit communications.Traditional two lines bus is all adopt power supply and the mode of the time-sharing multiplex that communicates, that is, often communicate once, all needs to stop communication a period of time, is bus charging, maintains the normal work of communication nodes all in bus; In addition, traditional two lines bus generally adopts up voltage, the mode of centrifugal current communicates, that is, host node adopts voltage signal to send information to from node, sends information from node with current signal to host node, and be master slave communication, only have host node which to be patrolled and examined from node, which sends information from node ability, and general host node patrols and examines all one-periods from node in a few second.To sum up, there is the long shortcoming of time delay in traditional two line communication, and maximum delay is host node patrols and examines all one-periods from node.
Chinese patent publication No. is that the patent of invention of CN103530969A discloses a kind of fire alarm controller loop unit and control method thereof, the scheme that communication works with power supply is simultaneously proposed in this patent, decrease system communication time delay, but the working method of this system is still adopt up voltage, the master slave communication mode of centrifugal current, the maximum delay of its communication is a polling period, still there is the shortcoming that communication delay is long.。
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of two lines bus loop communications system with bus arbitration, to solve the long technical matters of the communication delay that causes because of master slave communication in two line communication.
According to an aspect of the present invention, there is provided a kind of two lines bus loop communications system with bus arbitration, comprise loop card and multiple circuit units, loop card is connected with each circuit units, for each circuit units is powered, and pass through level communication between loop card and each circuit units, loop card comprises level control circuit and the constant current output circuit be connected with level control circuit respectively, current compensation circuit and host node signal processing unit, circuit units comprises nonpolarity circuit, draw current circuit, current stabilization circuit, from node signal processing unit with from node level sampling circuit, nonpolarity circuit is connected with level control circuit and host node signal processing unit respectively, draw current circuit, current stabilization circuit is connected with nonpolarity circuit respectively with from node level sampling circuit, from node signal processing unit respectively with draw current circuit, current stabilization circuit is connected with from node level sampling circuit, wherein:
Constant current output circuit in order to output constant current electric signal to level control circuit;
Current compensation circuit is connected with the input/output terminal of level control circuit respectively, in order to the size of the output terminal sampling output level from level control circuit, calculates the size of current needing to compensate, exports offset current to level control circuit input end;
Level control circuit is in order to receive the control command of host node signal processing unit, and the electric current that nonpolarity circuit of sampling flows through, in conjunction with the size of current that constant-current circuit and current compensation circuit export, the level of control level control circuit output terminal, sends to host node signal processing unit and nonpolarity circuit by level signal;
Host node signal processing unit to be connected with level sampling by control linkage and to be connected with level control circuit, by control linkage, level controling signal is sent to level control circuit, connect by level sampling the level signal that sampled level control circuit sends to nonpolarity circuit;
The level signal that nonpolarity circuit exports in order to incoming level control circuit, sends to the level signal received from node level sampling circuit, draws current circuit and current stabilization circuit;
Send to from node signal processing unit from node level sampling circuit in order to the level signal that the nonpolarity circuit sampled is exported;
The electric signal obtained, in order to obtain electric signal from nonpolarity circuit, is exported to from node signal processing unit by current stabilization circuit, ensures that the current stabilization flowing into current stabilization circuit input end is constant;
Obtain electrical current from node signal processing unit from current stabilization circuit, receive data time, receive from node level sampling circuit sampling to level signal, send data time, to draw current circuit send draw current order, control draw electric current;
Draw current circuit to receive and draw current order from node signal processing unit, draw electric current, change the electric current flowing through nonpolarity circuit.
Preferably, loop card communicates with adopting voltage signal between circuit units, realize communication to carry out with power supply simultaneously, and adopt bus hardware arbitration mechanism: when in bus, two communication nodes send signal in bus simultaneously, one sends low level, one sends high level, bus shows low level.
Preferably, level control circuit comprises the resistance connecing power-and host node draws current circuit, resistance anode respectively with nonpolarity circuit, constant current output circuit, current compensation circuit connects, an electric current part for constant current output circuit and current compensation circuit input flows through resistance, a part flows to nonpolarity circuit, a part flows to host node and draws current circuit, magnitude of voltage on line between resistance and nonpolarity circuit depends on the electric current flowing through resistance, thus draw current circuit to draw the electric current that nonpolarity circuit is flow through in electric current and adjustment to reach the object adjusting level control circuit output voltage by host node.
Preferably, the information that will receive is obtained by the line voltage distribution between sampled level control circuit and nonpolarity circuit when host node signal processing unit receives information; When host node signal processing unit sends information, the output level of control level control circuit, the level of sampled level control circuit output simultaneously, if when exporting high level, sample low level, then illustrating currently has communication node sending data in bus, and present node abandons bus marco, until other nodes are sent.
Preferably, nonpolarity circuit is a rectifier bridge, and the voltage of high 1 PN junction of rectifier bridge input end specific output end, electric current is completely equal.
Preferably, comprise level latch cicuit from node level sampling circuit, be used for latch high level signal, when level control circuit output low level, for current from node signal processing unit multilevel iudge be that high level or low level provide threshold value.
Preferably, obtained the information that will receive by the voltage that the nonpolarity circuit of sampling exports from node signal processing unit; When the information of transmission, the level exported by controlling to draw current circuit to draw electric current to carry out control level control circuit, the level that nonpolarity circuit of simultaneously sampling exports, if when exporting high level, sample low level, then illustrating currently has communication node sending data in bus, and present node abandons bus marco, until other nodes are sent.
Compared with prior art, the present invention has following beneficial effect: the two lines bus loop communications system of band bus arbitration of the present invention adopts bus arbitration mechanism, the nothing realizing loop is patrolled and examined, non-master slave communication, if make any one detector in fire-fighting system report a fire, do not need to wait for that oneself is patrolled and examined by loop card, just initiatively can send fire alarm information to loop card, greatly reduce system communication time delay, simultaneously, by realizing the communication of low and high level under high voltages between loop of the present invention card and circuit units, reach communication, the effect that power supply acts on simultaneously, achieve the function of power communications concurrent working, further reduction communication delay.Therefore, compared with prior art, the present invention efficiently solves the long technical matters of the communication delay that causes because of master slave communication in two line communication, has communication speed fast, the low and advantage that communication accuracy is high of system delay.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the structure principle chart of the two lines bus loop communications system of band bus arbitration of the present invention.
In figure: 1 be constant current output circuit, 2 be current compensation circuit, 3 for level control circuit 4 be host node signal processing unit, 5 be nonpolarity circuit, 6 for drawing current circuit, 7 to be current stabilization circuit, 8 for from node signal processing unit, 9 for from node level sampling circuit.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
Refer to Fig. 1, a kind of two lines bus loop communications system with bus arbitration, comprise loop card and multiple circuit units, loop card is connected with each circuit units, for each circuit units is powered, and pass through level communication between loop card and each circuit units, loop card communicates with adopting voltage signal between circuit units, realize communication to carry out with power supply simultaneously, and adopt bus hardware arbitration mechanism: when in bus, two communication nodes send signal in bus simultaneously, one sends low level, and one sends high level, bus shows low level.
Loop card comprises level control circuit and the constant current output circuit be connected with level control circuit respectively, current compensation circuit and host node signal processing unit, circuit units comprises nonpolarity circuit, draw current circuit, current stabilization circuit, from node signal processing unit with from node level sampling circuit, nonpolarity circuit is connected with level control circuit and host node signal processing unit respectively, draw current circuit, current stabilization circuit is connected with nonpolarity circuit respectively with from node level sampling circuit, from node signal processing unit respectively with draw current circuit, current stabilization circuit is connected with from node level sampling circuit, wherein:
Constant current output circuit in order to output constant current electric signal to level control circuit.
Current compensation circuit is connected with the input/output terminal of level control circuit respectively, in order to the size of the output terminal sampling output level from level control circuit, calculates the size of current needing to compensate, exports offset current to level control circuit input end.
The level that current compensation circuit exports according to level control circuit exports offset current, make when the change of outside circuit units quantity causes the curent change of the circuit flow through between level control circuit and nonpolarity circuit, between control level control circuit and nonpolarity circuit, the voltage of line is in defined threshold.
Level control circuit is in order to receive the control command of host node signal processing unit, and the electric current that nonpolarity circuit of sampling flows through, in conjunction with the size of current that constant-current circuit and current compensation circuit export, the level of control level control circuit output terminal, sends to host node signal processing unit and nonpolarity circuit by level signal.
Level control circuit comprises the resistance connecing power-and host node draws current circuit, resistance anode respectively with nonpolarity circuit, constant current output circuit, current compensation circuit connects, an electric current part for constant current output circuit and current compensation circuit input flows through resistance, a part flows to nonpolarity circuit, a part flows to host node and draws current circuit, magnitude of voltage on line between resistance and nonpolarity circuit depends on the electric current flowing through resistance, thus draw current circuit to draw the electric current that nonpolarity circuit is flow through in electric current and adjustment to reach the object adjusting level control circuit output voltage by host node.
Host node signal processing unit to be connected with level sampling by control linkage and to be connected with level control circuit, by control linkage, level controling signal is sent to level control circuit, connect by level sampling the level signal that sampled level control circuit sends to nonpolarity circuit.
Host node signal processing unit obtains the information that will receive by the line voltage distribution between sampled level control circuit and nonpolarity circuit when receiving information; When host node signal processing unit sends information, by the output level of control level control circuit, the level of sampled level control circuit output simultaneously, if when exporting high level, sample low level, then illustrating currently has communication node sending data in bus, and present node abandons bus marco, until other nodes are sent.
The level signal that nonpolarity circuit exports in order to incoming level control circuit, sends to the level signal received from node level sampling circuit, draws current circuit and current stabilization circuit.
The line that nonpolarity circuit is mainly used to realize loop card and circuit units just need not distinguished, negative wire, how to connect can proper communication, and nonpolarity circuit is exactly a rectifier bridge, and the voltage of high 1 PN junction of the input end specific output of rectifier bridge end, electric current is completely equal.
Send to from node signal processing unit from node level sampling circuit in order to the level signal that the nonpolarity circuit sampled is exported.
Comprise level latch cicuit from node level sampling circuit, be used for latch high level signal, when level control circuit output low level, for current from node signal processing unit multilevel iudge be that high level or low level provide threshold value.
Current stabilization circuit obtains electric signal from nonpolarity circuit, exports to from node signal processing unit, and the effect of current stabilization circuit makes the current stabilization of inflow current stabilization circuit input end constant.
Obtain electrical current from node signal processing unit from current stabilization circuit, receive data time, receive from node level sampling circuit sampling to level signal; When sending data, send to drawing current circuit and draw current order, control to draw electric current.
Obtain electrical current from node signal processing unit from current stabilization circuit, when receiving information, the voltage exported by nonpolarity circuit of sampling obtains the information that will receive; When the information of transmission, the level exported by controlling to draw current circuit to draw electric current to carry out control level control circuit, the level that nonpolarity circuit of simultaneously sampling exports, if when exporting high level, sample low level, then illustrating currently has communication node sending data in bus, and present node abandons bus marco, until other nodes are sent.
Draw current circuit to receive and draw current order from node signal processing unit, draw electric current, change the electric current flowing through nonpolarity circuit.
When drawing current circuit to be mainly used in wanting output level from node signal processing unit, by drawing current circuit to draw electric current to change the electric current flowing out level control circuit, and then change the level of level control circuit output.
In a preferred embodiment of the present invention, the two lines bus loop communications system of band bus arbitration of the present invention is applied to Physical layer, and each layer that more than link layer communicates adopts CAN communication protocol to realize.Constant current output circuit constant output 51mA; Current compensation circuit, detecting that the time that the output level of level control circuit is less than 25V is greater than 5S, will export offset current, and make the output voltage of level control circuit be greater than 25V; The resistance connecing power-of level control circuit inside selects 510 Ohmages, and host node draws current circuit when drawing electric current, will draw the electric current of 10mA; Latched by level lower than high level 2.5V loop bus from node level sampling circuit, lower than this voltage is low level, and higher than this voltage is high level.Draw current circuit to draw the electric current of 10mA, like this, the height in bus, low level voltage difference is 5.1V.The input end of current stabilization circuit is stabilized in 500 microamperes.
In the present embodiment, LPC1765 single-chip microcomputer selected by the processor of host node signal processing unit, LPC1765 single-chip microcomputer inside is integrated with CAN controller, the reception of CAN controller is sent pin and is connected with the sampling end in level control circuit and control end by high speed photo coupling, also LPC1765 single-chip microcomputer is adopted from the processor of node signal processing unit, use its CAN communication interface, by high speed photo coupling with from node level sampling circuit and draw current circuit to be connected.Due to CAN inner band bus arbitration protocol, this system is again the hardware system with bus arbitration function, therefore, at application, uses this communication system with regard to adopting the use-pattern of CAN.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (7)
1. the two lines bus loop communications system with bus arbitration, it is characterized in that, comprise loop card and multiple circuit units, described loop card is connected with each described circuit units, for each circuit units is powered, and pass through level communication between described loop card and each described circuit units, described loop card comprises level control circuit and the constant current output circuit be connected with described level control circuit respectively, current compensation circuit and host node signal processing unit, described circuit units comprises nonpolarity circuit, draw current circuit, current stabilization circuit, from node signal processing unit with from node level sampling circuit, described nonpolarity circuit is connected with described level control circuit and host node signal processing unit respectively, describedly draw current circuit, current stabilization circuit is connected with described nonpolarity circuit respectively with from node level sampling circuit, describedly draw current circuit with described respectively from node signal processing unit, current stabilization circuit is connected with from node level sampling circuit, wherein:
Described constant current output circuit in order to output constant current electric signal to level control circuit;
Described current compensation circuit is connected with the input/output terminal of level control circuit respectively, in order to the size of the output terminal sampling output level from level control circuit, calculates the size of current needing to compensate, exports offset current to level control circuit input end;
Described level control circuit is in order to receive the control command of host node signal processing unit, and the electric current that nonpolarity circuit of sampling flows through, in conjunction with the size of current that constant-current circuit and current compensation circuit export, the level of control level control circuit output terminal, sends to host node signal processing unit and nonpolarity circuit by level signal;
Described host node signal processing unit to be connected with level sampling by control linkage and to be connected with level control circuit, by control linkage, level controling signal is sent to level control circuit, connect by level sampling the level signal that sampled level control circuit sends to nonpolarity circuit;
The level signal that described nonpolarity circuit exports in order to incoming level control circuit, sends to the level signal received from node level sampling circuit, draws current circuit and current stabilization circuit;
Describedly send to from node signal processing unit from node level sampling circuit in order to the level signal that the nonpolarity circuit sampled is exported;
The electric signal obtained, in order to obtain electric signal from nonpolarity circuit, is exported to from node signal processing unit by described current stabilization circuit, ensures that the current stabilization flowing into current stabilization circuit input end is constant;
Describedly obtain electrical current from node signal processing unit from current stabilization circuit, when receiving data, receive from node level sampling circuit sampling to level signal; When sending data, send to drawing current circuit and draw current order, control to draw electric current;
Describedly draw current circuit to receive to draw current order from node signal processing unit, draw electric current, change the electric current flowing through nonpolarity circuit.
2. the two lines bus loop communications system according to claim 1 with bus arbitration, it is characterized in that, described loop card communicates with adopting voltage signal between circuit units, realize communication to carry out with power supply simultaneously, and adopt bus hardware arbitration mechanism: when in bus, two communication nodes send signal in bus simultaneously, one sends low level, and one sends high level, bus shows low level.
3. the two lines bus loop communications system according to claim 1 with bus arbitration, it is characterized in that, described level control circuit comprises the resistance connecing power-and host node draws current circuit, described resistance anode respectively with nonpolarity circuit, constant current output circuit, current compensation circuit connects, an electric current part for constant current output circuit and current compensation circuit input flows through described resistance, a part flows to nonpolarity circuit, a part flows to host node and draws current circuit, magnitude of voltage on line between described resistance and nonpolarity circuit depends on the electric current flowing through described resistance, thus draw current circuit to draw electric current by host node and adjust the object that the electric current flowing through nonpolarity circuit reaches the output voltage of adjustment level control circuit.
4. the two lines bus loop communications system according to claim 2 with bus arbitration, is characterized in that, obtains the information that will receive when described host node signal processing unit receives information by the line voltage distribution between sampled level control circuit and nonpolarity circuit; When described host node signal processing unit sends information, the output level of control level control circuit, the level of sampled level control circuit output simultaneously, if when exporting high level, sample low level, then illustrating currently has communication node sending data in bus, and present node abandons bus marco, until other nodes are sent.
5. the two lines bus loop communications system according to claim 2 with bus arbitration, is characterized in that, described nonpolarity circuit is a rectifier bridge, and the voltage of high 1 PN junction of described rectifier bridge input end specific output end, electric current is completely equal.
6. the two lines bus loop communications system according to claim 1 with bus arbitration, it is characterized in that, describedly comprise level latch cicuit from node level sampling circuit, be used for latching high level signal, when level control circuit output low level, for current from node signal processing unit multilevel iudge be that high level or low level provide threshold value.
7. the two lines bus loop communications system according to claim 1 with bus arbitration, is characterized in that, the described information being obtained receiving from node signal processing unit by the voltage that the nonpolarity circuit of sampling exports; When the information of transmission, the level exported by controlling to draw current circuit to draw electric current to carry out control level control circuit, the level that nonpolarity circuit of simultaneously sampling exports, if when exporting high level, sample low level, then illustrating currently has communication node sending data in bus, and present node abandons bus marco, until other nodes are sent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410668339.9A CN104408855B (en) | 2014-11-20 | 2014-11-20 | Two bus loop communication system with bus arbitrator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410668339.9A CN104408855B (en) | 2014-11-20 | 2014-11-20 | Two bus loop communication system with bus arbitrator |
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| CN104408855A true CN104408855A (en) | 2015-03-11 |
| CN104408855B CN104408855B (en) | 2017-01-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049311A (en) * | 2015-09-17 | 2015-11-11 | 北京建安成自动化电控技术有限公司 | Two-bus communication method and system |
| CN115442174A (en) * | 2022-07-20 | 2022-12-06 | 山东大学 | CAN bus polarity automatic correction module and battery management system |
| CN116248434A (en) * | 2023-05-05 | 2023-06-09 | 北京智芯传感科技有限公司 | Communication method, device and equipment of two buses and storage medium |
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| DE102012224515A1 (en) * | 2012-12-28 | 2014-07-03 | Tridonic Gmbh & Co. Kg | Interface circuit for signal transmission |
| CN104077260A (en) * | 2013-03-29 | 2014-10-01 | 华立仪表集团股份有限公司 | Concentrator M-BUS host communication interface device |
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| CN101995876A (en) * | 2010-12-18 | 2011-03-30 | 重庆市智能水表有限责任公司 | M-BUS controller |
| CN202720744U (en) * | 2012-08-09 | 2013-02-06 | 四川久远智能监控有限责任公司 | Fire alarm controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105049311A (en) * | 2015-09-17 | 2015-11-11 | 北京建安成自动化电控技术有限公司 | Two-bus communication method and system |
| CN105049311B (en) * | 2015-09-17 | 2019-03-29 | 北京建安成自动化电控技术有限公司 | Two-bus communication and communication system |
| CN115442174A (en) * | 2022-07-20 | 2022-12-06 | 山东大学 | CAN bus polarity automatic correction module and battery management system |
| CN115442174B (en) * | 2022-07-20 | 2023-06-06 | 山东大学 | CAN bus polarity automatic correction module and battery management system |
| CN116248434A (en) * | 2023-05-05 | 2023-06-09 | 北京智芯传感科技有限公司 | Communication method, device and equipment of two buses and storage medium |
| CN116248434B (en) * | 2023-05-05 | 2023-06-30 | 北京智芯传感科技有限公司 | Communication method, device and equipment of two buses and storage medium |
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| CN104408855B (en) | 2017-01-11 |
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