CN100493079C - Method for main node supporting different agreement type secondary unit apparatus on secondary node - Google Patents
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- CN100493079C CN100493079C CNB2004100001744A CN200410000174A CN100493079C CN 100493079 C CN100493079 C CN 100493079C CN B2004100001744 A CNB2004100001744 A CN B2004100001744A CN 200410000174 A CN200410000174 A CN 200410000174A CN 100493079 C CN100493079 C CN 100493079C
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Abstract
The invention discloses a method for main node to support slave unit devices of different protocol types on slave node, in main and slave communication protocols, presetting key assignments and masks of message contents of slave unit devices of each protocol type and establishing a corresponding relationship of masks and key assignments of message contents of slave unit devices of the same protocol type with upper-layer application program, and the method includes the following steps: the main node receives the message sent from the slave node and one by one selects unselected mask of message content of a protocol type, and obtains key assignments of message content by the selected mask; compares the obtained key assignments with the key assignments of message contents of the mentioned protocol type: if they are the same, select the upper layer application program corresponding to the key assignments of message contents of the mentioned protocol type; otherwise discard the message of the slave node.
Description
Technical field
The present invention relates to a kind of communication protocol technology, particularly relate to the host node support from the node the different agreement type from the method for unit.
Background technology
The system that finishes specific function is generally constituted by a plurality of subsystem element with relatively independent function, the status of these subsystem element in system is different, generally have a master unit that occupy main status and a plurality of occupy subordinate status from the unit.Master unit is the subsystem that occupy the driver's seat in the system, finishes the major function of system, and controls other subsystem; From the unit is the subsystem that occupy the Be Controlled status the system, finishes the miscellaneous function of system, and accepts the control of master unit.
Fig. 1 is the schematic diagram that concerns of master and slave node.Referring to Fig. 1, a host node and one or more are arranged from node in General System, host node and connect each other by communication port between the node, and communicate the communication port time division multiplexing by the master-slave communication agreement.
The master-slave communication agreement is a master unit equipment and the communication protocol of deferring to when unit intercoms mutually in the system.In the master-slave communication agreement, the corresponding host node notion of master unit, from the node notion, node is a logical concept from the unit correspondence, and the unit is a physical concept, is meant the subsystem of finishing specific function.
Exist dissimilar in the system from unit, be not meant function difference from unit type difference from unit, and be meant that the protocol type of being deferred to is different when unit carries out message interaction with master unit equipment, and with the corresponding different upper level applications of these agreements.
In existing master-slave communication agreement, host node by discern from node identification defer to the different agreement type from unit, and then find from the node from the upper level applications of unit, finish support from unit.
Existing techniques in realizing host node support different agreement type from the node from the method for unit is:
Method one: set corresponding relation from node number and protocol type, host node by discern from node number defer to the different agreement type from unit.Being determined by hardware from node number of equipment all has toggle switch on each equipment, by the toggle switch set device from node number.For example have defer to the different agreement type from unit A with from unit B, protocol type one correspondence that set device A defers to be 1 from node number, so in erection unit A, the toggle switch of device A pushed 1 position, when the device A place from node 1 after host node sends message, host node by in the message from node number 1 identification equipment A, and find the upper level applications of device A, finish support to device A.
If the toggle switch of device A does not push 1 position, promptly there is not corresponding relation in the protocol type of deferring to from node number and device A one of device A, and device A can not be supported so; If the toggle switch that will defer to the equipment B of protocol type two pushes 1 position because the protocol type that equipment B is deferred to two with do not have corresponding relation from node number 1, equipment B can not be supported so.As seen, in this method, fix from the corresponding relation of node number and protocol type, so, when equipment dial from node number corresponding with agreement that this equipment is deferred to when there is not corresponding relation in node number, this equipment can not be supported.
Method two: set corresponding relation from node baud rate and protocol type, host node by discern from the node baud rate defer to the different agreement type from unit.For example have defer to the different agreement type from unit A and equipment B, protocol type one correspondence that set device A defers to be 15000 from the node baud rate, when the device A place from node after host node sends message, host node identifies device A by this baud rate 15000 from node, and find the upper level applications of device A, finish support to device A.
If when actual transmissions, the baud rate of device A is 9600, and promptly there is not corresponding relation in the protocol type of deferring to from node baud rate and device A one of device A, and device A can not be supported so; If deferring to the Transmission bit rate of the equipment B of protocol type two is 15000, because the protocol type two that equipment B is deferred to and do not have corresponding relation between the node baud rate 15000, equipment B can not be supported so.As seen, in this method, fix from the corresponding relation of node baud rate and protocol type, so, when the actual transmissions baud rate of certain equipment corresponding with agreement that this equipment is deferred to when there is not corresponding relation in the node baud rate, this equipment can not be supported.As seen, in existing master-slave communication agreement, host node is by realizing the support of different agreement type from unit from node identification.But, owing to fix from the corresponding relation of node identification and protocol type, so when when there are not corresponding relation in the actual identification of node and protocol type, host node can not support from the node from unit, thereby cause host node low, can't adapt to change and expansion from unit to supporting rate from unit.
As seen, in the prior art, even the protocol type of deferring to from unit does not change, but as long as change, will cause host node can't support from the node from unit from node identification.
And in the master-slave communication agreement, host node is made the host node side with the process branch that carries out message interaction from node and from two parts of node side, and host node side and safeguarding a state machine respectively from the node side is finished the transmission and the reception of message by state machine.
Fig. 2 is the master-slave communication state machine diagram of host node.Referring to Fig. 2, in the existing master-slave communication agreement, the host node state machine has five states, and wherein, idle condition 201 is that data send and receive the public state of flow process; Wait for inquiry response state 202 and wait for that receiving data mode 203 is used for the Data Receiving flow process; Be used for the data transmission flow etc. response status 204 to be transmitted and wait reception response status 205.The normal state of host node state machine is an idle condition 201, and idle condition 201 has cyclic attributes, and this cyclic attributes has two values: polling cycle and transmission cycle.
Receive in the flow process at existing host node message, host node polling cycle of idle condition 201 to sending querying command from node; Waiting for that inquiry response state 202 receives the inquiry response of beaming back from node; In waiting for reception data mode 203, receive the data message of sending from node.
In existing host node message transmission flow, host node at the transmission cycle of idle condition 201 to sending transmission command from node; In waiting response status 204 to be transmitted to sending datagram from node; Waiting for that receiving the reception message that reception is sent from node in the response status 205 replys.
Fig. 3 is the master-slave communication state machine diagram from node.Referring to Fig. 3, in the existing master-slave communication agreement, from the total one of four states of node state machine, wherein, wait command state 301 is that data send and receive the public state of flow process; Wait for and receive coomand mode 302 and wait for that receiving response status 303 is used for the data transmission flow; Wait for that receiving data mode 304 is used for the Data Receiving flow process.From the normal state of node state machine is wait command state 301, and wait command state 301 has cyclic attributes, and its cyclic attributes is opposite with the cyclic attributes of the idle condition 201 of host node state machine.
From node message transmission flow, send inquiry response at wait command state 301 to host node existing from node; In waiting for reception coomand mode 302, send datagram to host node; Waiting for that receiving the reception message that the reception host node is sent in the response status 303 replys.
From the node message receives, receive the transmission command of host node existing at wait command state 301 from node; In waiting for reception data mode 304, receive the data message that host node is sent.
Summary of the invention
In view of this, the object of the present invention is to provide host node support different agreement type from the node by the protocol type of deferring to from unit, to make host node find upper level applications from unit from the method for unit.
In order to achieve the above object, technical scheme of the present invention is achieved in that
Host node supports that the different agreement type is from the method for unit from the node, in the master-slave communication agreement, set message content key assignments and the message content mask of each protocol type in advance from unit, and set up same protocol type from the corresponding relation between message content mask, message content key assignments and the upper level applications three of unit, this method may further comprise the steps:
A, host node receive the message of sending from node;
B, choose the message content mask of a protocol type of not selecting for use, and obtain message content key assignments in the message by the message content mask of choosing;
C, the message content key assignments of acquisition and the message content key assignments of the described protocol type of step B are compared, if the message content key assignments that obtains is identical with the message content key assignments of the described protocol type of step B, execution in step E then, if the message content key assignments that obtains is different with the message content key assignments of the described protocol type of step B, and there is the not message content mask of selected mistake, then return step B, if the message content key assignments that obtains is different with the message content key assignments of the described protocol type of step B, and all selected mistake of the message content mask of all protocol types, then execution in step D;
D, host node be packet loss, prompt alarm information, and process ends;
E, choose upper level applications that the message content key-value pair of the described protocol type of step B answers for from node from the upper level applications of unit.
The step of described setting message content key assignments comprises: set in the message can unique identification during from unit and master unit devices communicating the message content of the protocol type of deferring to be the message content key assignments of this protocol type.
The step of described setting message content mask comprises: set the message content mask and be made up of address offset amount and mask value, and set the address offset amount and the mask value of message content mask according to the message content key assignments.
The described step of setting the address offset amount of message content mask according to the message content key assignments comprises: the address offset amount of setting the message content mask is that message content key assignments residing byte position in message subtracts one.
The described step of setting the mask value of message content mask according to the message content key assignments comprises: the byte number of setting mask value is the byte number of message content key assignments, and each byte position of setting mask value is a hexadecimal full value.
The described step by the message content key assignments in the message content mask acquisition message of choosing of step B comprises: will be used for determining that the pointer of message content key assignments is offset, the side-play amount of pointer is the value of address offset amount in the message content mask, choosing pointer indication byte position then is the start bit of message content key assignments in the current message, and the byte figure place of choosing mask value in the message content mask is the byte figure place of message content key assignments in the current message, then with the mask value of the message content key assignments chosen and message content mask with, obtain the message content key assignments in the message.
This method further comprises: after host node receives the message of sending from node in described steps A, search earlier in the message from node number, and judge whether this keeping records from node number, if there is not this keeping records from node number, then with this message as the literary composition of reporting for the first time, and preserve in this literary composition of reporting for the first time from node number, carry out described step B again to step e, the corresponding relation of the upper level applications that the literary composition of set up preserving then of reporting for the first time is chosen from node number and described step e, if this keeping records from node number is arranged, then do not carry out described step B to step e, directly choose and be somebody's turn to do from node number corresponding upper application program.
Described steps A may further comprise the steps:
A, host node to sending querying command from node, are moved to the inquiry response state of waiting for then in the polling cycle of idle condition;
B, receive the querying command that host node is sent at the wait command state, and data message is arranged, then send this data message, move to then and wait for and receive response status to host node from node;
C, host node are in waiting for the inquiry response state, if receive wrong data message,, and remain on the inquiry response state of waiting for then to sending the transmission wrong responses from node, if host node receives correct data message, then to send the transmission successful respond from node;
D, from node during wait for receiving response status, if wait acknowledge is overtime or receive the transmission wrong responses, retransmission data message then, and remain on and wait for and receive response status if receive the transmission successful respond from node, is then moved to the wait command state.
Steps d is described from node retransmission data message, and remains on the step that wait for to receive response status and further comprise: reach the upper limit from the number of times of node retransmission data message, then move to the wait command state.
The repeating transmission number of times of data message preestablishes according to the importance of message.
As seen, the inventive method is by receiving flow process and simplifying from node message transmission flow to the host node message, save the command interaction process of returning inquiry response and the order of host node transmission Data Receiving from node, improved host node and from the traffic rate between the node, and the error probability when having reduced communication.The inventive method is by setting up same protocol type from the one-to-one relationship between message content mask, message content key assignments and the upper level applications three of unit, realize host node to of the support of different agreement type, avoided changing and causing host node not support shortcoming from the node from unit from node identification from unit.According to the proposed method, by to increasing accordingly or change operation from message content mask, message content key assignments and the upper level applications of unit and corresponding relation thereof in the master-slave communication controll block, also can in time adapt to from the node increase and change from unit.
Description of drawings
Fig. 1 is the schematic diagram that concerns of master and slave node;
Fig. 2 is the master-slave communication state machine diagram of host node in the prior art;
Fig. 3 is from the master-slave communication state machine diagram of node in the prior art;
Fig. 4 is the flow chart of the inventive method;
Fig. 5 is the master-slave communication state machine diagram of host node in the inventive method;
Fig. 6 is from the master-slave communication state machine diagram of node in the inventive method.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and Examples.
Preestablish message content key assignments and the message content mask of each protocol type from unit, and set up same protocol type from the corresponding relation between message content mask, message content key assignments and the upper level applications three of unit, wherein, the message content of the message content key assignments protocol type of deferring to that is unique identification when unit and master unit equipment carry out message interaction; The message content mask is made up of address offset amount and mask value, the address offset amount of setting the message content mask subtracts one for message content key assignments residing byte position in message corresponding with this message content mask, the byte number of setting the mask value of message content mask is the byte number of the message content key assignments corresponding with this message content mask, and each byte position of mask value is a hexadecimal full value.
Regulation obtains message content key assignments from the node message by the message content mask in the master-slave communication agreement, the upper level applications from unit from the node of searching the message content key assignments identical with the message content key assignments that obtains and answering with the message content key-value pair that finds in master-slave communication controll block.
But the character unique identification protocol type because shake hands, so the character setting of will shaking hands in the present embodiment is the message content key assignments.
For example, have defer to protocol type 1. from unit C, the protocol type character of shaking hands 1. is for " HD ", the character " HD " of will shaking hands is set at protocol type message content key assignments 1..The character " HD " of shaking hands is positioned at the 3rd byte position in message, set protocol type message content mask 1. according to this character of shaking hands " HD " so, character " HD " the residing byte position in message of will shaking hands subtracts one, obtain the address offset amount 2 of message content mask, the byte number of character " HD " of shaking hands is 2, so the mask value of message content mask is a byte number is a hexadecimal full value of 2, i.e. 0xFFFF.
Fig. 4 is the flow chart of the inventive method.Referring to Fig. 4, realize that the host node supported protocol type method from unit C 1. specifically may further comprise the steps:
Step 401: after receiving the querying command that host node sends from node, send message to host node.
Step 402: host node receives the message of sending from node.
Step 403: host node find in the message from node number, and judge should whether keeping records be arranged from node number, if keeping records is arranged, then execution in step 404, if there is not keeping records, then execution in step 405.
Step 404: host node then basis finds and is somebody's turn to do from the corresponding upper level applications from unit of node number from node number, and process ends.
Step 405: host node with the message that receives as the literary composition of reporting for the first time, and preserve in this literary composition of reporting for the first time from node number.
Step 406: in master-slave communication controll block, choose the message content mask of a protocol type of not selecting for use, and according to the message content mask chosen obtain to report for the first time message content key assignments in the literary composition, for example choose protocol type message content mask 1., the address offset amount of this message content mask is 2, to be used for determining that the pointer of message message content key assignments is offset, the side-play amount of pointer is the value 2 of address offset amount in the message content mask, choose the start bit of the 3rd byte position of pointer indication then for message content key assignments in this literary composition of reporting for the first time, because the byte figure place of mask value 0xFFFF is 2 in the message content mask, the byte figure place of then setting message content key assignments in this message is 2, then with the mask value 0xFFFF of the message content key assignments chosen and message content mask with, obtain the message content key assignments of this literary composition of reporting for the first time.
Step 407: the message content key assignments and the protocol type message content key assignments " HD " 1. of the literary composition of will reporting for the first time compare, and whether the message content key assignments of judging this literary composition of reporting for the first time is identical with protocol type message content key assignments " HD " 1., if it is inequality, then execution in step 408, if identical, then execution in step 410.
Step 408: judge whether there is the not selected message content mask of crossing protocol type in the master-slave communication controll block,, then return step 406, if there is no, then execution in step 409 if exist.
Step 409: host node will be from the node packet loss, and prompt alarm information, process ends then.
Step 410: choose the upper level applications of answering and be the upper level applications from node from unit C with protocol type message content key-value pair 1., and set up in the literary composition of reporting for the first time from node number and choose from the node from the corresponding relation between the upper level applications of unit C.
In order to improve host node and from the traffic rate between the node, and the error probability when having reduced communication, a preferred embodiment is: with host node in the step 401 to send querying command from node, after receiving querying command from node, the process that sends message to host node is simplified, promptly the host node message is received flow process and simplify, save host node and secondary command interaction process from node from node message transmission flow.
Fig. 5 is the master-slave communication state machine diagram of host node in the inventive method, Fig. 6 be in the inventive method from the master-slave communication state machine diagram of node, introduce that host node message after the simplification receives flow process and from node message transmission flow below in conjunction with Fig. 5 and Fig. 6.
Receive in the flow process at the host node message, the wait of removing the host node state machine receives data mode 203, cancels host node simultaneously to the Data Receiving order that sends from node.
The host node message receives flow process: host node to sending querying command from node, is moved to the inquiry response state 202 of waiting for then in the polling cycle of idle condition 201, wait for since replying that node is beamed back; In waiting for inquiry response state 202, if the host node wait acknowledge is overtime or since replying of beaming back of node be to show that the impunity that does not have data to send replys, host node is moved to idle condition 201 so, and cyclic attributes is moved to transmission cycle, if host node receives wrong data message, then to send the transmission wrong responses from node, simultaneously, host node remains on the inquiry response state 202 of waiting for, wait is from node retransmission data message, if host node receives correct data message, then to send the transmission successful respond from node, host node is moved to idle condition 201 then, and cyclic attributes is moved to transmission cycle.
Correspondingly, from node message transmission flow, remove wait reception coomand mode 302, busy the replying that cancellation sends to host node from node from the node state machine.
From node message transmission flow be: receive the querying command that host node is sent at wait command state 301 from node, if do not have data message will send to host node from node, then sending impunity to host node replys, simultaneously, remain on wait command state 301 from node, if have data message will send to host node from node, then send this data message to host node, move to from node then and wait for reception response status 303; In waiting for reception response status 303, if it is overtime or receive the transmission wrong responses from the node wait acknowledge, retransmission data message then, the repeating transmission number of times of data message can preestablish, simultaneously, remain on wait from node and receive response status 303, surpass the upper limit, move to wait command state 301 from node so if receive the repeating transmission number of times that sends successful respond or data message from node.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, the host node support from the node the different agreement type from the method for unit, it is characterized in that, in the master-slave communication agreement, set message content key assignments and the message content mask of each protocol type in advance from unit, and set up same protocol type from the corresponding relation between message content mask, message content key assignments and the upper level applications three of unit, this method may further comprise the steps:
A, host node receive the message of sending from node;
B, choose the message content mask of a protocol type of not selecting for use, and obtain message content key assignments in the message by the message content mask of choosing;
C, the message content key assignments of acquisition and the message content key assignments of the described protocol type of step B are compared, if the message content key assignments that obtains is identical with the message content key assignments of the described protocol type of step B, execution in step E then, if the message content key assignments that obtains is different with the message content key assignments of the described protocol type of step B, and there is the not message content mask of selected mistake, then return step B, if the message content key assignments that obtains is different with the message content key assignments of the described protocol type of step B, and all selected mistake of the message content mask of all protocol types, then execution in step D;
D, host node be packet loss, prompt alarm information, and process ends;
E, choose upper level applications that the message content key-value pair of the described protocol type of step B answers for from node from the upper level applications of unit.
2, method according to claim 1, it is characterized in that the step of described setting message content key assignments comprises: set in the message can unique identification during from unit and master unit devices communicating the message content of the protocol type of deferring to be the message content key assignments of this protocol type.
3, method according to claim 1, it is characterized in that, the step of described setting message content mask comprises: set the message content mask and be made up of address offset amount and mask value, and set the address offset amount and the mask value of message content mask according to the message content key assignments.
4, method according to claim 3, it is characterized in that the described step of setting the address offset amount of message content mask according to the message content key assignments comprises: the address offset amount of setting the message content mask is that message content key assignments residing byte position in message subtracts one.
5, according to claim 3 or 4 described methods, it is characterized in that, the described step of setting the mask value of message content mask according to the message content key assignments comprises: the byte number of setting mask value is the byte number of message content key assignments, and each byte position of setting mask value is a hexadecimal full value.
6, method according to claim 5, it is characterized in that, the described step by the message content key assignments in the message content mask acquisition message of choosing of step B comprises: will be used for determining that the pointer of message content key assignments is offset, the side-play amount of pointer is the value of address offset amount in the message content mask, choosing pointer indication byte position then is the start bit of message content key assignments in the current message, and the byte figure place of choosing mask value in the message content mask is the byte figure place of message content key assignments in the current message, then with the mask value of the message content key assignments chosen and message content mask with, obtain the message content key assignments in the message.
7, method according to claim 1, it is characterized in that, this method further comprises: after host node receives the message of sending from node in described steps A, search earlier in the message from node number, and judge whether this keeping records from node number, if there is not this keeping records from node number, then with this message as the literary composition of reporting for the first time, and preserve in this literary composition of reporting for the first time from node number, carry out described step B again to step e, the corresponding relation of the upper level applications that the literary composition of set up preserving then of reporting for the first time is chosen from node number and described step e, if this keeping records from node number is arranged, then do not carry out described step B to step e, directly choose and be somebody's turn to do from node number corresponding upper application program.
8, method according to claim 1 is characterized in that, described steps A may further comprise the steps:
A, host node to sending querying command from node, are moved to the inquiry response state of waiting for then in the polling cycle of idle condition;
B, receive the querying command that host node is sent at the wait command state, and data message is arranged, then send this data message, move to then and wait for and receive response status to host node from node;
C, host node are in waiting for the inquiry response state, if receive wrong data message,, and remain on the inquiry response state of waiting for then to sending the transmission wrong responses from node, if host node receives correct data message, then to send the transmission successful respond from node;
D, from node during wait for receiving response status, if wait acknowledge is overtime or receive the transmission wrong responses, retransmission data message then, and remain on and wait for and receive response status if receive the transmission successful respond from node, is then moved to the wait command state.
9, method according to claim 8, it is characterized in that, steps d is described from node retransmission data message, and remains on the step that wait for to receive response status and further comprise: reach the upper limit from the number of times of node retransmission data message, then move to the wait command state.
10, method according to claim 9 is characterized in that, the repeating transmission number of times of data message preestablishes according to the importance of message.
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| CNB2004100001744A CN100493079C (en) | 2004-01-08 | 2004-01-08 | Method for main node supporting different agreement type secondary unit apparatus on secondary node |
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| CNB2004100001744A CN100493079C (en) | 2004-01-08 | 2004-01-08 | Method for main node supporting different agreement type secondary unit apparatus on secondary node |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101159656B (en) * | 2007-11-12 | 2011-05-11 | 华为技术有限公司 | Packet sampling method, system and equipment |
| CN105634690A (en) * | 2015-06-24 | 2016-06-01 | 东莞市芯谷电子科技有限公司 | Method for reinforcing communication reliability of pattern machine serial port |
| CN106878098A (en) * | 2015-12-10 | 2017-06-20 | 深圳市中兴微电子技术有限公司 | The identifying processing method and device of data message |
| CN105635802A (en) * | 2015-12-31 | 2016-06-01 | 浙江大华技术股份有限公司 | Transmission method of digital media data and device |
| CN106155586B (en) * | 2016-05-31 | 2019-03-08 | 华为技术有限公司 | A kind of storage method, server and storage control |
| CN107273158B (en) * | 2017-06-08 | 2021-10-26 | 广东美的暖通设备有限公司 | Program upgrading method and device, host, slave and multi-split air conditioning system |
| CN107567065B (en) * | 2017-08-16 | 2020-11-10 | 南京天溯自动化控制系统有限公司 | Transparent data transmission method and system based on wireless self-organizing network |
| CN110955170B (en) * | 2018-09-27 | 2023-10-17 | 中车株洲电力机车研究所有限公司 | End-to-end self-adaptive synchronization method and plug-and-play traction control device |
| CN113746647B (en) * | 2020-05-27 | 2023-12-19 | 中国联合网络通信集团有限公司 | Data transmission method, node, electronic device and readable storage medium |
| CN113609518B (en) * | 2021-06-18 | 2023-12-12 | 天津津航计算技术研究所 | Message protocol timeout retransmission method and system based on association container map |
| CN114884852B (en) * | 2022-05-07 | 2024-04-23 | 武汉思普崚技术有限公司 | Node interaction and protocol identification method, device, equipment and computer medium |
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