CN110430109B - Two-bus-based fire-fighting equipment communication method and system - Google Patents
Two-bus-based fire-fighting equipment communication method and system Download PDFInfo
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- CN110430109B CN110430109B CN201910737194.6A CN201910737194A CN110430109B CN 110430109 B CN110430109 B CN 110430109B CN 201910737194 A CN201910737194 A CN 201910737194A CN 110430109 B CN110430109 B CN 110430109B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/4013—Management of data rate on the bus
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Abstract
The communication method and the communication system of the fire fighting equipment based on the two buses comprise main equipment and slave equipment, wherein the main equipment and the slave equipment try different baud rates to communicate according to an appointed sequence, and then judge whether the current baud rate can normally communicate according to a receipt fed back by the slave equipment. Therefore, the best baud rate of communication between the master device and the slave device is determined repeatedly, and communication is carried out at the baud rate finally. The invention greatly increases the flexibility and expandability of the whole fire fighting system, has higher compatibility with the original fire fighting equipment in the system when the fire fighting equipment is replaced or added, and ensures that the communication speed reaches the best.
Description
Technical Field
The invention relates to the field of fire fighting equipment, in particular to a communication technology between fire fighting equipment.
Background
The existing fire fighting equipment generally realizes communication between the equipment through two buses. Compared with a four-wire system (the four-bus system comprises two power supply lines and two communication lines), the two buses combine a power supply line and a signal line into a whole, and signals and power supply share the same bus. From this, fire-fighting equipment based on two buses can save construction and cable cost for four bus systems, has brought very big facility for site operation and later maintenance. Therefore, the two-bus technology is widely applied in the fields of fire fighting, instruments, sensors, industrial control and the like.
Typical BUS technologies include M-BUS, fire BUS, etc. The fire bus system adopts the common line of the detector and the address coding technology, namely dozens to hundreds of detectors can be simultaneously installed on the same line, the detectors are simultaneously powered through two buses, and the state information of alarming, failure and the like of any one detector can be accurately reflected according to the address coding of the detector.
The two buses are communicated, the voltage between the two buses is generally 24V, and the two bus communication circuit at the sending end serially outputs digital quantity to be transmitted to the two buses in a current or voltage mode; the receiving end receives serial signals in the form of current or voltage while obtaining power from the bus, thereby realizing that the bus is shared by the power and the signals.
However, in the serial communication mode adopted by the existing fire-fighting two-bus, the baud rates of the sending end and the receiving end need to be kept consistent, and then the effectiveness of communication can be ensured. The baud rate is the rate of a single chip or a computer during serial communication, and refers to the change rate of a signal in unit time after being modulated, i.e., the number of times of carrier parameter changes in unit time, which can be understood as the rate of data transmission and reception in the serial communication process. Only if the sending end and the receiving end keep the baud rate consistent, the carrier data can be correctly identified.
With the development of hardware technology, the communication speed between the hardware is faster and faster. The fire-fighting two-bus communication mode obviously has the following defects: the serial communication speed in the existing fire-fighting two-bus communication system can not be adjusted, and the transmission speed required by the novel equipment is higher than that of the old equipment, so that the old equipment and the new equipment can not normally communicate with each other due to different transmission speeds. Because the baud rate of the equipment in the existing system can not be adjusted, the fire-fighting system can only select the same baud rate, so that the equipment has poor expandability and relatively high maintenance cost.
In view of the above disadvantages, there is a need for a communication method and device capable of adaptively adjusting the communication rate of a two-bus power system.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a communication method and a communication system of fire fighting equipment based on two buses.
Firstly, in order to achieve the above purpose, a communication method of a fire fighting device based on two buses is provided, which comprises the following steps: firstly, the main equipment sends test information to a second power bus at a first baud rate; secondly, the master equipment receives a receipt fed back by the slave equipment on the power secondary bus according to the test information, judges whether the receipt is correct or not, and if the receipt is correct, jumps to the third step; otherwise, jumping to the fourth step; thirdly, the main equipment records the baud rate of the recently received receipt; the main device sends test information at a second baud rate, and then jumps to the second step; the fourth step; the master device and the slave device communicate with each other through the electric power two buses according to the baud rate of the receipt recorded recently; wherein the second baud rate is greater than the first baud rate; and, each time the third step is performed, the second baud rate is incremented.
Therefore, the same baud rate is required to be used for communication on the same two buses, the disorder of data receiving and transmitting of equipment with different baud rates is avoided, and the efficiency of data transmission can be ensured. The baud rates used in communication are universal baud rates which exist in programs of the master device and the slave device, after the system runs, the programs control the master device and the slave device to sequentially send and receive test information from low to high, if wrong data are received, the programs judge that the current baud rate exceeds the maximum available baud rate, and the last baud rate is directly used as the optimal baud rate.
Optionally, in the above method, the master device and the slave device agree in advance with test information and receipt content corresponding to the test information; the master device and the slave device are agreed with a communication protocol in advance.
Optionally, in the foregoing method, each time the third step is executed, the second baud rate is increased in an order of 1200Bd, 2400Bd, 4800Bd, and 9600 Bd.
Optionally, in the foregoing method, the test information may be generated by a program, and the method includes: a start flag, data content, a check bit, and an end flag;
the step of sending the test information specifically includes:
step t1, encapsulating the predetermined test information according to a predetermined communication protocol;
and step t2, sending the packaged test information to the power two bus according to the required baud rate.
Optionally, in the foregoing method, the receipt is generated by the slave device according to the following steps: r1, receiving the test information and analyzing the test information according to an agreed communication protocol; r2, generating a receipt according to the test information obtained by analysis and the predetermined content, and packaging the receipt according to the predetermined communication protocol; and r3, sending the packaged receipt to the power two bus according to the required baud rate. The data receiving and transmitting sides have corresponding programs to judge the correctness of the data, the corresponding judging conditions exist in the programs, the judging conditions are agreed by the two sides, the sending side can send the test data according to agreed contents, the receiving side analyzes and judges the data, if the analyzed data is the agreed contents, one information is returned, otherwise, the other information is returned. Thus, the correctness of the receipt information can be judged.
Optionally, in the foregoing method, the step of determining whether the receipt is correct includes: and receiving the receipt, analyzing the receipt according to an agreed communication protocol, judging whether the receipt meets the pre-agreed content, if so, judging that the receipt is correct, and otherwise, judging that the receipt is wrong.
Secondly, in order to achieve the purpose, a communication system of the fire fighting equipment based on the two buses is further provided, and the communication system comprises a master device and at least one slave device. The master device or the slave device comprises a storage unit, and the storage unit stores the optimal baud rate; the master equipment or the slave equipment communicates through a power two bus according to the optimal baud rate; wherein the optimal baud rate is obtained by the steps of:
step b1, receiving test information sent to the power two bus by the slave device at a first baud rate;
step b2, the slave device feeds back a receipt according to the test information; jumping to step b3 when the receipt sent by the slave device is correct; jumping to step b4 when the response sent by the slave device is incorrect;
step b3, recording the baud rate of the receipt which is sent recently, receiving the test information which is sent at a second baud rate from the equipment, and then jumping to the step b 2;
and b4, the slave device communicates through the power two bus according to the baud rate of the receipt recorded recently.
Optionally, in the above system, the master device is a control device in some fire protection systems, and includes: a fire alarm controller, a control device of an automatic fire extinguishing system, a control device of an indoor fire hydrant system, a control device of a smoke prevention and exhaust system and an air conditioning ventilation system, a control device of a fireproof rolling curtain and the like.
Optionally, in the foregoing system, the slave device includes: trigger device and aggregate unit. Wherein, triggering device is the device that can automatic or manual production fire alarm signal, includes: various temperature-sensing, smoke-sensing and combustible gas detectors, manual alarm buttons and the like. The linkage equipment is an execution component in a fire alarm system, and can be automatically or manually started after receiving a fire alarm signal, and the linkage equipment comprises: audible and visual alarms, fire-fighting broadcasts, fire pumps, smoke exhaust fans and the like.
In the system, the adjustment of baud rates of both communication parties is controlled by respective internal software programs. The program has a variable for storing the baud rate, the judgment condition of the program circularly judges whether the received and transmitted test data is correct, if the test data is correct, the baud rate is increased, the circular judgment is continued, until the error data is received, the program directly jumps out of the circular judgment condition, and the program records the baud rate used in the last normal communication.
Advantageous effects
The communication rate (baud rate) between the master device and the slave device in the fire fighting system provided by the invention is changeable, and the sending end and the receiving end in the system can agree on the optimal communication rate and carry out communication according to the rate in a self-adaptive manner. Therefore, the flexibility and the expandability of the whole fire fighting system are greatly increased, and the compatibility between the fire fighting equipment and the original fire fighting equipment in the system is higher when the fire fighting equipment is replaced or increased.
In an application scenario that the master device and the slave device simultaneously support various commonly used baud rates, before communication, the master device and the slave device can agree on the baud rate to be used in a mode of sending and receiving test information so as to adapt to the baud rates of different devices and enable the communication rate to be optimal.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is an architecture diagram of a communication system for a two bus based fire apparatus according to the present invention;
FIG. 2 is a schematic diagram of the communication interaction of a two-bus based fire fighting device according to the present invention;
fig. 3 is a flowchart of a communication method of a two-bus based fire fighting device according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 1 is a communication system of a two-bus based fire fighting device according to the present invention, including: the system comprises a master device and at least one slave device, and is characterized in that the master device or the slave device comprises a storage unit, and the storage unit stores the optimal baud rate;
the master equipment or the slave equipment communicates through a power two bus according to the optimal baud rate;
wherein the optimal baud rate is obtained by the steps of:
the master device sends test information to the second power bus at a first baud rate. The slave device receives the test information sent to the power two-bus at the first baud rate, and further feeds back a receipt according to the test information.
And the master equipment receives a receipt fed back by the slave equipment on the power two bus according to the test information. When the receipt sent by the slave device is correct: recording the baud rate of the recently sent receipt, sending test information by the main device at a second baud rate, wherein the second baud rate is higher than the last time, receiving the test information sent at the second baud rate by the auxiliary device, and then jumping to the step of judging the receipt to continuously judge the receipt sent at the higher baud rate;
when the receipt sent by the slave device is incorrect: the master device and the corresponding slave devices use the baud rate of the receipt recorded recently as the optimal baud rate, and the communication is carried out by the optimal baud rate through the two power buses.
The communication in the two buses is that analog signals are converted into digital signals for transmission: the second bus chip of the sending end serially outputs digital quantity to be transmitted to the second bus in a current or voltage mode; the receiving end can receive signals while obtaining power from the bus, thereby realizing the communication of the power and signal shared bus. Thus, when certain fire fighting equipment fails and needs to be replaced or the fire fighting system is desired to be expanded, compatibility of communication with existing equipment is considered when new equipment is purchased. By the method, the communication rate can be adaptive among different devices. That is, as shown in fig. 2 or 3, the optimal baud rate for both-side communication is agreed between the master and slave devices (e.g., fire alarm controller, smoke detector, etc.) before actual communication. For example, before normal communication, the master and slave devices try several common baud rates (1200Bd, 2400Bd, 4800Bd, 9600Bd, etc.) through test information, and agree to perform communication test starting from one bit rate: after the device is started, the main device sequentially sends test information at a certain baud rate, and all the slave devices in the loop sequentially receive and send receipt information at the corresponding baud rate until the main device receives different receipt information in a certain test process. At this time, the best baud rate for the communication between the master device and the slave device is the baud rate used in the last normal communication. The best effect can be achieved by carrying out communication at the baud rate.
Specifically, the master device and the slave device transmit and receive test information at different baud rates to agree on the baud rate to be used for communication. Initially, both sides can choose to transmit and receive information with the lowest baud rate, and if all the baud rates can be normally communicated, both sides continue to increase the baud rates and perform test communication again; if a certain communication process has error information, the baud rate used in the last normal communication is appointed to be the baud rate to be used.
The determination method of the baud rate is also suitable for updating the master equipment and the slave equipment in the fire fighting equipment network. Because the compatibility problem of communication needs to be considered between the updated fire fighting equipment, the master equipment can send test information to all the slave equipment by using different baud rates in sequence from the lowest baud rate, and the slave equipment also receives the test information and sends receipt information to the master equipment in sequence from the lowest baud rate. If all the receipt information received by the master equipment is correct, the test communication is normally received and transmitted, and the master equipment and the slave equipment can increase the baud rate to perform the receiving and transmitting of a new round of test information again; if an error occurs in the process of receiving and sending a certain test message, the transmission of the test message is incorrect, and the baud rate of the normal communication of the previous time can be used as the baud rate of the communication between the devices by the master device and the slave device.
The technical scheme of the invention has the advantages that: the defects that the equipment and two buses adopted in the existing fire fighting system are fixed and invariable in communication speed (baud rate) are overcome. The proposal provides a communication rate self-adaptive electric power two-bus implementation method and equipment, which not only can well support various baud rates, but also can automatically appoint the baud rate used in communication according to the baud rates of both communication parties, so that the communication rate and the communication effect are optimal.
Before communication, the two parties carry out test communication at the lowest baud rate, if the master equipment can correctly receive receipt information sent by all slave equipment, the communication is normal, the baud rates of the two parties are increased to carry out test communication again until error information exists in a certain communication process, and the agreed optimal baud rate is the baud rate used in the last normal communication.
Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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 (8)
1. A communication method of fire fighting equipment based on two buses is characterized by comprising the following steps:
firstly, the main equipment sends test information to a second power bus at a first baud rate;
secondly, the master equipment receives a receipt fed back by the slave equipment on the power secondary bus according to the test information, judges whether the receipt is correct or not, and if the receipt is correct, jumps to the third step; otherwise, jumping to the fourth step;
thirdly, the main equipment records the baud rate of the recently received receipt; the main device sends test information at a second baud rate, and then jumps to the second step;
the fourth step; the master device and the slave device communicate with each other through the electric power two buses according to the baud rate of the receipt recorded recently;
wherein the second baud rate is greater than the first baud rate; and, every time the third step is executed, the second baud rate is increased in the order of 1200Bd, 2400Bd, 4800Bd, and 9600 Bd.
2. The communication method of the fire fighting equipment based on the two buses as claimed in claim 1, wherein the master equipment and the slave equipment have predetermined test information and receipt content corresponding to the test information; the master device and the slave device are agreed with a communication protocol in advance.
3. The method of claim 1, wherein the test information comprises: a start flag, data content, a check bit, and an end flag;
the step of sending the test information specifically includes:
step t1, encapsulating the predetermined test information according to a predetermined communication protocol;
and step t2, sending the packaged test information to the power two bus according to the required baud rate.
4. A communication method for a two-bus based fire fighting device as defined in any one of claims 1 to 3, wherein the response piece is generated by the slave device according to the following steps:
r1, receiving the test information and analyzing the test information according to an agreed communication protocol;
r2, generating a receipt according to the test information obtained by analysis and the predetermined content, and packaging the receipt according to the predetermined communication protocol;
and r3, sending the packaged receipt to the power two bus according to the required baud rate.
5. The communication method of the two-bus based fire fighting equipment according to claim 4, wherein the step of determining whether the receipt is correct comprises: and receiving the receipt, analyzing the receipt according to an agreed communication protocol, judging whether the receipt meets the pre-agreed content, if so, judging that the receipt is correct, and otherwise, judging that the receipt is wrong.
6. A fire fighting equipment communication system based on two buses comprises a master device and at least one slave device, and is characterized in that the master device or the slave device comprises a storage unit, and the storage unit stores the optimal baud rate;
the master equipment or the slave equipment communicates through a power two bus according to the optimal baud rate; wherein the optimal baud rate is obtained by the steps of:
step b1, receiving test information sent to the power two bus by the slave device at a first baud rate;
step b2, the slave device feeds back a receipt according to the test information; jumping to step b3 when the receipt sent by the slave device is correct; jumping to step b4 when the response sent by the slave device is incorrect;
step b3, recording the baud rate of the receipt which is sent recently, receiving the test information which is sent at a second baud rate from the equipment, and then jumping to the step b 2;
and b4, the slave device communicates through the power two bus according to the baud rate of the receipt recorded recently.
7. The two-bus based fire fighting equipment communication system of claim 6, wherein said master devices include but are not limited to: a fire alarm controller, a control device of an automatic fire extinguishing system, a control device of an indoor fire hydrant system, a control device of a smoke prevention and exhaust system and an air conditioning ventilation system, and a control device of a fireproof rolling curtain.
8. The two-bus based fire fighting equipment communication system according to claim 7, wherein the slave device comprises: a trigger device and a linkage device;
among these, device triggering means include, but are not limited to: various temperature-sensing, smoke-sensing and combustible gas detectors and manual alarm buttons;
the linkage devices include, but are not limited to: audible and visual alarm, fire control broadcasting, fire pump, smoke exhaust fan.
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| CN111459727B (en) * | 2019-12-25 | 2023-07-14 | 山东有人物联网股份有限公司 | Intelligent automatic test system and method for serial port baud rate maximum error-free tolerance range |
| CN111694785B (en) * | 2020-05-20 | 2023-08-15 | 哈尔滨工业大学 | Feedback UART self-adaptive baud rate system and self-adaptive baud rate method |
| CN111930105B (en) * | 2020-08-19 | 2021-10-29 | 山东众海智能科技有限公司 | Intelligent testing device and system for fire-fighting linkage control module |
| CN114172760A (en) * | 2021-11-15 | 2022-03-11 | 广州极飞科技股份有限公司 | Communication control method and device, unmanned vehicle, storage medium and electronic equipment |
| CN114322233B (en) * | 2021-12-17 | 2022-11-25 | 珠海格力电器股份有限公司 | Air conditioning unit monitoring method, device and equipment and air conditioning system |
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| US6532506B1 (en) * | 1998-08-12 | 2003-03-11 | Intel Corporation | Communicating with devices over a bus and negotiating the transfer rate over the same |
| CN102306444B (en) * | 2011-05-13 | 2013-03-13 | 浙江正泰中自控制工程有限公司 | Receiving circuit of meter-BUS (M-BUS) master station and data receiving method for receiving circuit |
| CN102681481B (en) * | 2012-05-24 | 2014-09-10 | 山西联华伟业科技有限公司 | Programmable logic controller (PLC) communication method based on universal serial bus (USB) |
| CN103036823B (en) * | 2012-12-14 | 2015-06-17 | 中船重工（武汉）凌久电子有限责任公司 | Baud rate fast self-adaptive method based on field programmable gate array (FPGA), processor and receiving end |
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