CN104408855B - Two bus loop communication system with bus arbitrator - Google Patents
Two bus loop communication system with bus arbitrator Download PDFInfo
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- CN104408855B CN104408855B CN201410668339.9A CN201410668339A CN104408855B CN 104408855 B CN104408855 B CN 104408855B CN 201410668339 A CN201410668339 A CN 201410668339A CN 104408855 B CN104408855 B CN 104408855B
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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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- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- 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, in particular it relates to the two lines bus loop of a kind of band bus arbitration leads to
Communication system.
Background technology
So-called two line communication refers to only two buses on communication bus, it is not necessary to a kind of communication party of extra power line
Formula.All of communication node all pass through these two buses from communication host node power taking and with host node communication.At fire alarm
Controller field, almost all of intelligence point type fire detector is all two lines bus loop with the communication of fire alarm control unit
Communication.Traditional two lines bus is all the mode using power supply with the time-sharing multiplex that communicates, i.e. often communicates once, is required for stopping
Stop-pass believes a period of time, charges for bus, maintains the normal work of all of communication node in bus；It addition, it is traditional
The commonly used up voltage of two lines bus, the mode of centrifugal current communicates, i.e. host node use voltage signal to from node
Transmission information, sends information with current signal to host node from node, and is that master slave communication, only host node are patrolled and examined
Which is from node, and which just starts to send information from node, general host node patrol and examine all from node cycle several
Second.To sum up, there is the shortcoming of time delay length in tradition two line communication, and maximum delay to be that host node is patrolled and examined all from node
A cycle.
Chinese patent publication No. is that the patent of invention of CN103530969A discloses a kind of fire alarm controller loop unit
And control method, this patent proposes the scheme that communication works with power supply simultaneously, decreases system communication delay, but
It is that the working method of this system is still that the up voltage of employing, the master slave communication mode of centrifugal current, the maximum of its communication
Time delay is a polling period, however it remains the shortcoming of communication delay length..
Summary of the invention
For defect of the prior art, the two lines bus loop that it is an object of the invention to provide a kind of band bus arbitration leads to
Communication system, to solve the technical problem of the communication delay length caused in two line communication because of master slave communication.
According to an aspect of the present invention, it is provided that the two lines bus loop communications system of a kind of band bus arbitration, including returning
An outpost of the tax office and multiple circuit units, loop card is connected with each circuit units, powers for each circuit units, and loop card with
Level communication is passed through between each circuit units；Loop card includes level control circuit and connects with level control circuit respectively
Constant current output circuit, current compensation circuit and the host node signal processing unit connect, circuit units includes nonpolarity electricity
Road, 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 and from
Node level sampling circuit is connected with nonpolarity circuit respectively, from node signal processing unit respectively with draw electric current electricity
Road, current stabilization circuit and from node level sampling circuit connect, wherein:
Constant current output circuit in order to the output constant current signal of telecommunication to level control circuit；
Current compensation circuit is connected with the input/output terminal of level control circuit respectively, in order to from the output of level control circuit
The size of end sampling output level, calculates the size of current needing to compensate, and it is defeated to level control circuit that output compensates electric current
Enter end；
Level control circuit is in order to receive the control command of host node signal processing unit, and samples what nonpolarity circuit flow through
Electric current, the size of current exported in conjunction with constant-current circuit and current compensation circuit, the level of control level control circuit outfan
Size, is sent to host node signal processing unit and nonpolarity circuit by level signal；
Host node signal processing unit is connected with level control circuit, by controlling by controlling to connect to connect with level sampling
Connect and level controling signal is sent to level control circuit, connect sampled level control circuit by level sampling and be sent to
The level signal of nonpolarity circuit；
The level signal that nonpolarity circuit exports in order to incoming level control circuit, the level signal received is sent to from
Node level sampling circuit, draws current circuit and current stabilization circuit；
From node level sampling circuit in order to the level signal that the nonpolarity circuit sampled exports is sent to from node letter
Number processing unit；
The signal of telecommunication obtained, in order to obtain the signal of telecommunication from nonpolarity circuit, is exported to processing from node signal single by current stabilization circuit
Unit, it is ensured that the current stabilization flowing into current stabilization circuit input is constant；
Obtain electric current from node signal processing unit from current stabilization circuit to power, when receiving data, receive from node level sampling
The level signal that circuit sampling arrives, when sending data, draws current order to drawing current circuit to send, controls to draw electric current；
Draw current circuit to receive and draw current order from node signal processing unit, draw electric current, change and flow through nonpolarity circuit
Electric current.
Preferably, voltage signal communication is used between loop card and circuit units, it is achieved communicate and carry out with powering simultaneously,
And use bus hardware arbitration mechanism: when in bus, two communication nodes send signal in bus simultaneously, send out for one
Sending low level, one sends high level, bus shows low level.
Preferably, level control circuit includes that one connects the negative resistance of power supply and host node draws current circuit, resistance anode
Respectively with nonpolarity circuit, constant current output circuit, current compensation circuit connects, constant current output circuit and current compensation circuit
An electric current part for input flows through resistance, and a part flows to nonpolarity circuit, and a part flows to host node and draws current circuit,
The magnitude of voltage on line between resistance and nonpolarity circuit depends on the electric current flowing through resistance, thus draws electricity by host node
The electric current that current circuit draws electric current and adjustment to flow through nonpolarity circuit reaches to adjust the purpose of level control circuit output voltage.
Preferably, host node signal processing unit passes through between sampled level control circuit and nonpolarity circuit when receiving information
Line voltage distribution obtain information to be received；When host node signal processing unit sends information, control level control circuit
Output level, the level of sampled level control circuit output simultaneously, if when exporting high level, sampling low level,
Then illustrating currently have communication node sending data in bus, present node abandons bus marco, until other nodes are sent out
Send complete.
Preferably, nonpolarity circuit is a rectifier bridge, and rectifier bridge input is the voltage of high 1 PN junction than outfan,
Electric current is essentially equal.
Preferably, include level latch cicuit from node level sampling circuit, be used for latching high level signal, in level control
During circuit output low level processed, for being currently that high level or low level provide threshold from node signal processing unit multilevel iudge
Value.
Preferably, information to be received is obtained from node signal processing unit by the voltage of nonpolarity circuit output of sampling；
When the information of transmission, draw current circuit to draw electric current to carry out the level of control level control circuit output by control, sample simultaneously
The level of nonpolarity circuit output, if when exporting high level, sampling low level, then illustrate currently to have communication node
Sending data in bus, present node abandons bus marco, until other nodes are sent.
Compared with prior art, the method have the advantages that the two lines bus of the band bus arbitration of the present invention returns
Road communication system uses bus arbitration mechanism, it is achieved the nothing in loop is patrolled and examined, non-master slave communication so that fire-fighting system
In, if any one detector is reported a fire, and all withouts waiting for loop card and patrols and examines oneself, it is possible to actively send
Fire alarm information, to loop card, greatly reduces system communication delay, meanwhile, the loop card of the present invention and circuit units
Between by realizing the communication of low and high level under high voltages, reach communication, effect that power supply acts on simultaneously, it is achieved
The function of power communications concurrent working, reduces communication delay further.Therefore, compared with prior art, this
The bright technical problem efficiently solving the communication delay length caused in two line communication because of master slave communication, has communication speed
Degree is fast, the advantage that system delay is low and communication accuracy is high.
Accompanying drawing explanation
The detailed description made non-limiting example with reference to the following drawings by reading, other of the present invention is special
Levy, purpose and advantage will become more apparent upon:
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 for current compensation circuit, 3 for level control circuit 4 for host node letter
Number processing unit, 5 be nonpolarity circuit, 6 for draw current circuit, 7 be current stabilization circuit, 8 be at node signal
Reason unit, 9 it is from node level sampling circuit.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following example will assist in those skilled in the art
Member is further appreciated by the present invention, but limits the present invention the most in any form.It should be pointed out that, the common skill to this area
For art personnel, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement.These broadly fall into
Protection scope of the present invention.
Referring to Fig. 1, the two lines bus loop communications system of a kind of band bus arbitration, including loop card and multiple loop
Unit, loop card is connected with each circuit units, powers for each circuit units, and between loop card and each circuit units
By level communication, use voltage signal communication between loop card and circuit units, it is achieved communicate and power to enter simultaneously
OK, and use bus hardware arbitration mechanism: when in bus, two communication nodes send signal in bus simultaneously, one
Individual transmission low level, one sends high level, bus shows low level.
Loop card includes that level control circuit and the constant current output circuit being connected with level control circuit respectively, electric current are mended
Repay circuit and host node signal processing unit, circuit units include nonpolarity circuit, draw current circuit, current stabilization circuit,
From node signal processing unit with from node level sampling circuit, nonpolarity circuit respectively with level control circuit and master
Node signal processing unit connect, draw current circuit, current stabilization circuit and from node level sampling circuit respectively with electrodeless
Property circuit connect, from node signal processing unit respectively with draw current circuit, current stabilization circuit and from node level sampling
Circuit connects, wherein:
Constant current output circuit in order to the output constant current signal of telecommunication to level control circuit.
Current compensation circuit is connected with the input/output terminal of level control circuit respectively, in order to from the output of level control circuit
The size of end sampling output level, calculates the size of current needing to compensate, and it is defeated to level control circuit that output compensates electric current
Enter end.
Current compensation circuit exports compensation electric current according to the level that level control circuit exports, and makes single in external circuit
When the change of unit's quantity causes the curent change of the circuit flow through between level control circuit and nonpolarity circuit, control level
Between 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 samples what nonpolarity circuit flow through
Electric current, the size of current exported in conjunction with constant-current circuit and current compensation circuit, the level of control level control circuit outfan
Size, is sent to host node signal processing unit and nonpolarity circuit by level signal.
Level control circuit includes that one connects the negative resistance of power supply and host node draws current circuit, resistance anode respectively with nothing
Polar circuit, constant current output circuit, current compensation circuit connects, constant current output circuit and the electricity of current compensation circuit input
A stream part flows through resistance, and a part flows to nonpolarity circuit, and a part flows to host node and draws current circuit, resistance and nothing
The magnitude of voltage on line between polar circuit depends on the electric current flowing through resistance, thus draws current circuit to draw by host node
Electric current reaches the purpose of adjustment level control circuit output voltage with adjusting the electric current flowing through nonpolarity circuit.
Host node signal processing unit is connected with level control circuit, by controlling by controlling to connect to connect with level sampling
Connect and level controling signal is sent to level control circuit, connect sampled level control circuit by level sampling and be sent to
The level signal of nonpolarity circuit.
Host node signal processing unit passes through the circuit between sampled level control circuit and nonpolarity circuit when receiving information
Voltage obtains information to be received；When host node signal processing unit sends information, defeated by control level control circuit
Going out level, the level of sampled level control circuit output simultaneously, if when exporting high level, sampling low level, then
Illustrating currently have communication node sending data in bus, present node abandons bus marco, until other nodes send
Complete.
The level signal that nonpolarity circuit exports in order to incoming level control circuit, the level signal received is sent to from
Node level sampling circuit, draws current circuit and current stabilization circuit.
Nonpolarity circuit is mainly used to realize the line of loop card and circuit units and just need not distinguish, and how negative wire connects all
Can proper communication, nonpolarity circuit is exactly a rectifier bridge, and the input of rectifier bridge than outfan high 1 PN junction
Voltage, electric current is essentially equal.
From node level sampling circuit in order to the level signal that the nonpolarity circuit sampled exports is sent to from node letter
Number processing unit.
Include level latch cicuit from node level sampling circuit, be used for latching high level signal, defeated at level control circuit
When going out low level, for being currently that high level or low level provide threshold value from node signal processing unit multilevel iudge.
Current stabilization circuit obtains the signal of telecommunication from nonpolarity circuit, and output is given from node signal processing unit, the effect of current stabilization circuit
It is to make the current stabilization of inflow current stabilization circuit input constant.
Obtain electric current from node signal processing unit from current stabilization circuit to power, when receiving data, receive from node level sampling
The level signal that circuit sampling arrives；When sending data, draw current order to drawing current circuit to send, control to draw electric current.
Obtain electric current from node signal processing unit from current stabilization circuit to power, when receiving information, by nonpolarity circuit of sampling
The voltage of output obtains information to be received；When the information of transmission, current circuit is drawn to draw electric current to carry out control level by control
The level of control circuit output, the level of nonpolarity circuit of simultaneously sampling output, if when exporting high level, sampled
Low level, then illustrate currently have communication node sending data in bus, and present node abandons bus marco, until its
He is sent by node.
Draw current circuit to receive and draw current order from node signal processing unit, draw electric current, change and flow through nonpolarity circuit
Electric current.
Current circuit is drawn to be mainly used in when node signal processing unit wants output level, by drawing current circuit to draw electric current
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 application of the band bus arbitration of the present invention
Each layer that communicates more than physical layer, link layer uses CAN communication protocol to realize.Constant current output circuit constant output
51mA；The time that current compensation circuit is less than 25V at output level level control circuit being detected is more than 5S, will output
Compensate electric current, make the output voltage of level control circuit more than 25V；Connect, within level control circuit, the resistance that power supply is negative
Selecting 510 ohmages, host node draws current circuit when drawing electric current, will draw the electric current of 10mA；Adopt from node level
Sample circuit will be less than the level of high level 2.5V on loop bus and latches, less than this voltage for low level, higher than this electricity
Pressure for high level.Drawing current circuit to draw the electric current of 10mA, so, the height in bus, low level voltage difference is 5.1V.
The input of current stabilization circuit is stable at 500 microamperes.
In the present embodiment, the processor of host node signal processing unit selects LPC1765 single-chip microcomputer, LPC1765 single-chip microcomputer
Being internally integrated CAN controller, receiving of CAN controller sends pin by high speed photo coupling and level control circuit
Sampling end and control end connect, and are also adopted by LPC1765 single-chip microcomputer from the processor of node signal processing unit, use its CAN
Communication interface, by high speed photo coupling with from node level sampling circuit with draw current circuit to be connected.Inside CAN
Band bus arbitration protocol, this system is again to have the hardware system of bus arbitration function, therefore, at application, just adopts
This communication system is used by the occupation mode of CAN.
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in
Stating particular implementation, those skilled in the art can make various deformation or amendment within the scope of the claims,
This has no effect on the flesh and blood of the present invention.
Claims (7)
1. the two lines bus loop communications system of a band bus arbitration, it is characterised in that include loop card and multiple times
Road unit, described loop card is connected with each described circuit units, powers for each circuit units, and described loop card with
Level communication is passed through between each described circuit units；Described loop card include level control circuit and respectively with described electricity
Constant current output circuit, current compensation circuit and the host node signal processing unit that level control circuit connects, described loop
Unit include nonpolarity circuit, draw current circuit, current stabilization circuit, from node signal processing unit with from node level
Sample circuit, described nonpolarity circuit is connected with described level control circuit and host node signal processing unit respectively,
Described draw current circuit, current stabilization circuit and be connected with described nonpolarity circuit respectively from node level sampling circuit, institute
State and draw current circuit, current stabilization circuit and connect from node level sampling circuit with described from node signal processing unit respectively
Connect, wherein:
Described constant current output circuit in order to the output constant current signal of telecommunication to level control circuit；
Described current compensation circuit is connected with the input/output terminal of level control circuit respectively, in order to from level control circuit
The size of outfan sampling output level, calculates the size of current needing to compensate, and output compensates electric current to Automatic level control electricity
Road input；
Described level control circuit is in order to receive the control command of host node signal processing unit, and nonpolarity circuit stream of sampling
The electric current crossed, the size of current exported in conjunction with constant current output circuit and current compensation circuit, control level control circuit exports
The level of end, is sent to host node signal processing unit and nonpolarity circuit by level signal；
Described host node signal processing unit is connected with level control circuit by controlling to connect to connect with level sampling, passes through
Control to connect and level controling signal is sent to level control circuit, connect sampled level control circuit by level sampling and send out
Give the level signal of nonpolarity circuit；
The level signal that described nonpolarity circuit exports in order to incoming level control circuit, sends the level signal received
Give from node level sampling circuit, draw current circuit and current stabilization circuit；
Described from node level sampling circuit in order to the level signal that the nonpolarity circuit sampled exports is sent to from joint
Point signal processing unit；
The signal of telecommunication obtained, in order to obtain the signal of telecommunication from nonpolarity circuit, is exported at node signal by described current stabilization circuit
Reason unit, it is ensured that the current stabilization flowing into current stabilization circuit input is constant；
Described obtain electric current from node signal processing unit from current stabilization circuit and power, when receiving data, receive from node level
The level signal that sampling circuit samples arrives；When sending data, draw current order to drawing current circuit to send, control to draw electric current；
Described draw current circuit to receive to draw current order from node signal processing unit, draw electric current, change flow through nonpolarity
The electric current of circuit.
The two lines bus loop communications system of band bus arbitration the most according to claim 1, it is characterised in that described
Use level signal communication between loop card and circuit units, it is achieved communicate and carry out with powering simultaneously, and use bus
Hardware mediation mechanism: when in bus, two communication nodes send signal in bus, and one sends low level simultaneously,
One sends high level, bus shows low level.
The two lines bus loop communications system of band bus arbitration the most according to claim 1, it is characterised in that described electricity
Level control circuit includes that one connects the negative resistance of power supply and host node draws current circuit, and described resistance anode is respectively with electrodeless
Property circuit, constant current output circuit, current compensation circuit connect, constant current output circuit and current compensation circuit input electric current
A part flows through described resistance, and a part flows to nonpolarity circuit, and a part flows to host node and draws current circuit, described electricity
The magnitude of voltage on line between resistance and nonpolarity circuit depends on the electric current flowing through described resistance, thus is drawn by host node
The electric current that current circuit draws electric current and adjustment to flow through nonpolarity circuit reaches the output voltage of adjustment level control circuit
Purpose.
The two lines bus loop communications system of band bus arbitration the most according to claim 2, it is characterised in that described master
Obtained by the level between sampled level control circuit and nonpolarity circuit when node signal processing unit receives information and want
The information received；When described host node signal processing unit sends information, the output level of control level control circuit, with
Time sampled level control circuit output level, if export high level time, sample low level, then illustrate currently have
Communication node is sending data in bus, and present node abandons bus marco, until other nodes are sent.
The two lines bus loop communications system of band bus arbitration the most according to claim 2, it is characterised in that described nothing
Polar circuit is a rectifier bridge, and described rectifier bridge input is the voltage of high 1 PN junction than outfan, the complete phase of electric current
Deng.
The two lines bus loop communications system of band bus arbitration the most according to claim 1, it is characterised in that described from
Node level sampling circuit includes level latch cicuit, is used for latching high level signal, exports low electricity at level control circuit
At ordinary times, for being currently that high level or low level provide threshold value from node signal processing unit multilevel iudge.
The two lines bus loop communications system of band bus arbitration the most according to claim 1, it is characterised in that described from
Node signal processing unit obtains information to be received by the level of nonpolarity circuit output of sampling；When the information of transmission,
Drawing current circuit to draw electric current to carry out the level of control level control circuit output by control, nonpolarity circuit of simultaneously sampling exports
Level, if when exporting high level, sampling low level, then illustrate currently to have communication node sending in bus
Data, present node abandons bus marco, until other nodes are sent.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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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| Publication Number | Publication Date |
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| CN104408855A CN104408855A (en) | 2015-03-11 |
| CN104408855B true CN104408855B (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410668339.9A Active CN104408855B (en) | 2014-11-20 | 2014-11-20 | Two bus loop communication system with bus arbitrator |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115442174B (en) * | 2022-07-20 | 2023-06-06 | 山东大学 | CAN bus polarity automatic correction module and battery management system |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995876B (en) * | 2010-12-18 | 2012-08-15 | 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 |
| DE102012224515A1 (en) * | 2012-12-28 | 2014-07-03 | Tridonic Gmbh & Co. Kg | Interface circuit for signal transmission |
| CN104077260B (en) * | 2013-03-29 | 2017-10-03 | 华立科技股份有限公司 | A kind of concentrator M BUS host communication interface arrangements |
| CN103530969B (en) * | 2013-11-01 | 2015-12-02 | 浙江爱德电子有限公司 | fire alarm controller loop unit and control method thereof |
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