CN104618199A - Node access automatic identifying method and device based on CAN (controller area network) communication and air conditioner - Google Patents
Node access automatic identifying method and device based on CAN (controller area network) communication and air conditioner Download PDFInfo
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Abstract
The invention discloses a node access automatic identifying method and a node access automatic identifying device based on CAN (controller area network) communication and an air conditioner. The node access automatic identifying method comprises the following steps: a step S1: accessing a new node into a CAN network; a step S2: sending an ID request frame to a CAN bus; a step S3: comparing times for sending the ID request frame with preset ID request frame sending times, judging whether a master node is damaged or not; a step S4: according to the judged results, selecting a slaver node or a master node to access into the CAN network. According to the node access automatic identifying method disclosed by the invention, automatic identifying for all replaced new nodes in the CAN network can be realized, the network communication reliability and the node universality are improved.
Description
Technical field
The present invention relates to communication technical field, in particular to a kind of access automatic identifying method of the node based on CAN communication and device, air conditioner.
Background technology
As shown in Figure 1, the automatic identification technology that existing CAN accesses new node adopts host-guest architecture mostly, that is: can assign one in a CAN network for host node, remaining is from node.When need from node failure more to renew from node time, the needing to send ID by CAN to host node from node and apply for frame of new access, can distribute No. ID to from node after host node receives application frame, what realize new node melts net.But what this mode then cannot realize new node when host node lost efficacy melts net, there is communication hidden danger in the host node troublesome poeration more renewed and easily makeing mistakes.
Summary of the invention
There is provided a kind of node based on CAN communication to access automatic identifying method and device, air conditioner in the embodiment of the present invention, the automatic identification of CAN network all replacings new node can be realized, improve the versatility of network communication reliability and node.
For solving the problems of the technologies described above, the embodiment of the present invention provides a kind of node based on CAN communication to access automatic identifying method, comprising: step S1: new node is linked into CAN network; Step S2: send ID claim frame to CAN; Step S3: the number of times sending ID claim frame is compared with the ID claim frame times N preset, judges whether host node damages; Step S4: select as being linked into CAN network from node or as host node according to judged result.
As preferably, described step S2 comprises: automatically broadcast a Frame by CAN after new node powers on, and this data frame packet is containing application function code and MAC Address.
As preferably, described step S3 comprises: send ID claim frame to CAN, if receive acknowledgement frame, and sends no more than N time of the number of times M of ID claim frame, then accesses CAN network as from node; If transmission ID claim frame number of times M is greater than N time and receives acknowledgement frame not yet, be then automatically updated into host node and be linked into CAN network.
As preferably, when judging that host node damages, own MAC address is converted to self ID by new node, and is connected to CAN network as host node.
As preferably, described node access automatic identifying method also comprises: step S5: when new node accesses in CAN network as host node, new node opens host node pattern, and broadcast frame data to other nodes, inform that this node is as new host node, other nodes are replied, and set up communication.
As preferably, N is 3.
According to a further aspect in the invention, provide a kind of node based on CAN communication access automatic identifying method, comprising: step S1: new node is linked into CAN network; Step S2: preset ID claim frame times N and send ID claim frame to CAN; Step S3: the number of times sending ID claim frame is compared with the ID claim frame times N preset, judges whether host node damages; Step S4: select as being linked into CAN network from node or as host node according to judged result.
In accordance with a further aspect of the present invention, provide a kind of node based on CAN communication access automatic identification equipment, comprising: access unit, for new node is accessed CAN network; Transmitting element, for being sent to CAN by the ID claim frame of new node; Comparing unit, compares with the ID claim frame times N preset for number of times new node being sent ID claim frame; According to the comparative result of comparing unit, judging unit, for judging whether host node damages; Processing unit, is linked in CAN network as from node or as host node for controlling new node according to the judged result of judging unit.
As preferably, node access automatic identification equipment also comprises host node converting unit, for new node being converted to host node when host node damages, broadcasting frame data to other nodes, informing that this node is as new host node, and sets up and communicate.
In accordance with a further aspect of the present invention, provide a kind of air conditioner, comprise node access automatic identification equipment, this node access automatic identification equipment is the above-mentioned access of the node based on CAN communication automatic identification equipment.
Apply technical scheme of the present invention, the node access automatic identifying method based on CAN communication comprises: step S1: new node is linked into CAN network; Step S2: send ID claim frame to CAN; Step S3: the number of times sending ID claim frame is compared with the ID claim frame times N preset, judges whether host node damages; Step S4: select as being linked into CAN network from node or as host node according to judged result.Pass through said method, new node can be made to be automatically updated to as host node when host node lost efficacy, what can realize new node more easily melts net, can realize the automatic identification of CAN network all replacings new node, improves the versatility of network communication reliability and node.
Accompanying drawing explanation
Fig. 1 is node of the prior art access automatic identifying method flow chart;
Fig. 2 is the access of the node based on the CAN communication automatic identifying method flow chart of the embodiment of the present invention;
Fig. 3 is the fundamental diagram of the access of the node based on the CAN communication automatic identification equipment of the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but not as a limitation of the invention.
Shown in Figure 2, according to embodiments of the invention, the node access automatic identifying method based on CAN communication comprises: step S1: new node is linked into CAN network; Step S2: send ID claim frame to CAN; Step S3: the number of times sending ID claim frame is compared with the ID claim frame times N preset, judges whether host node damages; Step S4: select as being linked into CAN network from node or as host node according to judged result.
When new node judges whether host node damages, if host node does not damage, then can receive the claim frame of new node and return an acknowledgement frame, be i.e. the frame of No. ID, this peer distribution, after new node receives acknowledgement frame, then prove that new node is linked in CAN communication network as from node.If host node damages, new node does not receive acknowledgement frame, then judge that new node is as in host node access CAN network.
N is herein preferably 3.Generally, ID claim frame times N can be preset according to the occupancy Rational choice of bus, the concrete value of N needs to determine according to network baud rate and data volume, baud rate is larger in theory, and the data transmission period of equivalent is also shorter, and bus idleness is also larger, the value of N is also less, vice versa, under current bandwidth condition, can meet application for 3 times and require.
N is herein pre-set in a program according to different occasion, is not revisable.
In another node based on CAN communication access automatic identifying method, carried out the automatic identification of node access by following steps, specifically comprise: step S1: new node is linked into CAN network; Step S2: preset ID claim frame times N and send ID claim frame to CAN; Step S3: the number of times sending ID claim frame is compared with the ID claim frame times N preset, judges whether host node damages; Step S4: select as being linked into CAN network from node or as host node according to judged result.
In this node access automatic identifying method, be first preset ID claim frame times N, send ID claim frame to CAN more afterwards, the benefit of this kind of method is the accuracy that can ensure ID claim frame transmission times.ID claim frame times N herein manually can be inputted as required by control panel, and applicability is better, and the scope of application is wider, has larger flexibility.
By above-mentioned node access automatic identifying method, can judge whether host node damages, and make new node be automatically updated to as host node when host node lost efficacy, make other nodes can continue proper communication by the host node after renewal, what can realize new node more easily melts net, solve the problem causing other new access node None-identifieds after original host node lost efficacy, effectively can improve ductility and the reliability of network, the automatic identification of CAN network all replacings new node can be realized, improve the versatility of network communication reliability and node.
New node is when sending ID claim frame to CAN, concrete step is: automatically broadcast a Frame by CAN after new node powers on, this data frame packet is containing application function code and MAC Address, intercepting part in the MAC Address that MAC Address is provided by MAC chip, host node can be that new node distributes No. ID according to the claim frame of new node.
When judging whether host node damages according to the ID claim frame times N preset, N ID claim frame can be sent to CAN, if receive acknowledgement frame, then accessing CAN network as from node; Still do not receive acknowledgement frame N time if sent, be then automatically updated into host node and be linked into CAN network.New node is when sending request frame herein, and circulation sends N time, if can receive acknowledgement frame in N time, then illustrate that host node does not damage, and can carry out proper communication, if still can not receive acknowledgement frame after N time, then illustrate that host node damages, new node opens host node pattern.
When judging whether host node damages according to the ID claim frame times N preset, can also carry out in the following way: send ID claim frame to CAN, if receive acknowledgement frame, and send no more than N time of the number of times M of ID claim frame, then access CAN network as from node; If transmission ID claim frame number of times M is greater than N time and receives acknowledgement frame not yet, be then automatically updated into host node and be linked into CAN network.In such cases, compare with the number of times and default ID claim frame times N that receive acknowledgement frame, if M is greater than N, then illustrates that host node damages, need new node to open host node pattern.
When judging that host node damages, own MAC address is converted to self ID by new node, and is connected to CAN network as host node.
When new node accesses in CAN network as host node, new node opens host node pattern, and broadcast frame data to other nodes, inform that this node is as new host node, other nodes are replied, set up communication, make CAN network to recover proper communication, other nodes can as interconnected from realizing between node and this new node.
The above-mentioned access automatic identifying method of the node based on CAN communication and device, air conditioner, what can facilitate new node melts net, and can after host node damages, new node is made automatically to be updated to host node rapidly, operating procedure is simpler, and be not easy to make mistakes, the versatility of network communication reliability and node can be improved.
Node based on CAN communication access automatic identifying method of the present invention is applicable to air conditioner, is particularly useful for business air conditioner and controller thereof.
In conjunction with shown in Figure 3, according to embodiments of the invention, the node access automatic identification equipment based on CAN communication comprises: access unit, for new node is accessed CAN network; Transmitting element, for being sent to CAN by the ID claim frame of described new node; Comparing unit, compares with the ID claim frame times N preset for the number of times described new node being sent ID claim frame; According to the comparative result of described comparing unit, judging unit, for judging whether host node damages; Processing unit, is linked in CAN network as from node or as host node for controlling described new node according to the judged result of described judging unit.
By above-mentioned automatic identification equipment, the automatic identification of CAN network all replacings new node can be realized, improve the versatility of network communication reliability and node.
Described node access automatic identification equipment also comprises host node converting unit, for described new node being converted to host node when host node damages, broadcasting frame data to other nodes, informing that this node is as new host node, and setting up communication.
According to embodiments of the invention, air conditioner comprises node access automatic identification equipment, and this node access automatic identification equipment is the above-mentioned access of the node based on CAN communication automatic identification equipment.
Certainly, be more than the preferred embodiment of the present invention.It should be pointed out that for those skilled in the art, under the prerequisite not departing from its general principles, can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1., based on a node access automatic identifying method for CAN communication, it is characterized in that, comprising:
Step S1: new node is linked into CAN network;
Step S2: send ID claim frame to CAN;
Step S3: the number of times sending ID claim frame is compared with the ID claim frame times N preset, judges whether host node damages;
Step S4: select as being linked into CAN network from node or as host node according to judged result.
2. node access automatic identifying method according to claim 1, it is characterized in that, described step S2 comprises: automatically broadcast a Frame by CAN after new node powers on, and this data frame packet is containing application function code and MAC Address.
3. node access automatic identifying method according to claim 2, it is characterized in that, described step S3 comprises:
Send ID claim frame to CAN, if receive acknowledgement frame, and send no more than N time of the number of times M of ID claim frame, then access CAN network as from node; If transmission ID claim frame number of times M is greater than N time and receives acknowledgement frame not yet, be then automatically updated into host node and be linked into CAN network.
4. node access automatic identifying method according to claim 3, it is characterized in that, when judging that host node damages, own MAC address is converted to self ID by new node, and is connected to CAN network as host node.
5. node access automatic identifying method according to claim 1, is characterized in that, described node access automatic identifying method also comprises:
Step S5: when new node accesses in CAN network as host node, new node opens host node pattern, and broadcast frame data to other nodes, inform that this node is as new host node, other nodes are replied, and set up communication.
6. node access automatic identifying method according to claim 1, it is characterized in that, N is 3.
7., based on a node access automatic identifying method for CAN communication, it is characterized in that, comprising:
Step S1: new node is linked into CAN network;
Step S2: preset ID claim frame times N and send ID claim frame to CAN;
Step S3: the number of times sending ID claim frame is compared with the ID claim frame times N preset, judges whether host node damages;
Step S4: select as being linked into CAN network from node or as host node according to judged result.
8., based on a node access automatic identification equipment for CAN communication, it is characterized in that, comprising:
Access unit, for accessing CAN network by new node;
Transmitting element, for being sent to CAN by the ID claim frame of described new node;
Comparing unit, compares with the ID claim frame times N preset for the number of times described new node being sent ID claim frame;
According to the comparative result of described comparing unit, judging unit, for judging whether host node damages;
Processing unit, is linked in CAN network as from node or as host node for controlling described new node according to the judged result of described judging unit.
9. node access automatic identification equipment according to claim 8, it is characterized in that, described node access automatic identification equipment also comprises host node converting unit, for described new node being converted to host node when host node damages, broadcast frame data to other nodes, inform that this node is as new host node, and set up communication.
10. an air conditioner, comprises node access automatic identification equipment, it is characterized in that, described node access automatic identification equipment is the access of the node based on the CAN communication automatic identification equipment described in claim 8 or 9.
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| CN201410831547.6A CN104618199A (en) | 2014-12-26 | 2014-12-26 | Node access automatic identifying method and device based on CAN (controller area network) communication and air conditioner |
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| CN201410831547.6A CN104618199A (en) | 2014-12-26 | 2014-12-26 | Node access automatic identifying method and device based on CAN (controller area network) communication and air conditioner |
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| CN104965473A (en) * | 2015-07-22 | 2015-10-07 | 广东美的暖通设备有限公司 | VRV air-conditioning system and automatic addressing method therefor based on CAN bus |
| CN112737639A (en) * | 2020-12-24 | 2021-04-30 | 阳光电源股份有限公司 | Phase sequence identification method for power line carrier communication and photovoltaic system |
| CN115277293A (en) * | 2022-07-26 | 2022-11-01 | 江苏恒立液压科技有限公司 | ID configuration system and method of equipment in CAN bus network |
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