CN113612499A - Method for realizing answering type two-way data acquisition - Google Patents
Method for realizing answering type two-way data acquisition Download PDFInfo
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- CN113612499A CN113612499A CN202110960947.7A CN202110960947A CN113612499A CN 113612499 A CN113612499 A CN 113612499A CN 202110960947 A CN202110960947 A CN 202110960947A CN 113612499 A CN113612499 A CN 113612499A
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Abstract
The invention provides a method for realizing responsive two-way data acquisition, which comprises the following steps: two monitoring hosts are configured to be connected to the same serial port of the answering type equipment, and the two monitoring hosts are connected through double-computer heartbeat communication; one monitoring host computer distributes the main right and sets the cut-off time of the main right; the dominant right is the right to send a request to the answering device; updating the cut-off time to be the time point of the current heartbeat packet plus a preset time period along with the updating of the heartbeat packet; the monitoring host with the distributed master right informs the other monitoring host of the deadline and the master right distribution result through a heartbeat packet; before expiration of the deadline, the monitoring host with the dominant right sends a request to the answering equipment, and the two monitoring hosts receive and analyze the response message returned by the answering equipment; and if the data acquisition state of the monitoring host with the master right is abnormal, switching the master right. The invention does not need to additionally increase serial ports, has independent logic among the serial ports of different devices when the main authority is distributed, and has strong fault-tolerant capability and strong universality.
Description
Technical Field
The invention relates to the technical field of data acquisition, in particular to a method for realizing answering type two-way data acquisition.
Background
The UPS data acquisition is an indispensable component of a railway disaster prevention monitoring system, the UPS sensor data acquisition is in a request and response mode, specifically, the UPS sensor is respectively connected with A, B machines of a set of monitoring host machine through the same serial port, if A, B machines send requests at the same time, data received by A, B machines are disordered, and the UPS data cannot be analyzed by the two machines; the same problem exists for two-way acquisition of other answerable devices.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for realizing answer-type two-way data acquisition, which does not need to additionally add a serial port, has strong logic independence of a single serial port dominant right distribution method, independent judgment of the dominant right of the serial ports of two answer-type devices, strong fault-tolerant capability and strong universality.
In order to achieve the above object, the technical solution adopted by the present invention is to provide a method for implementing answering-type two-way data acquisition, wherein the method comprises:
configuring two monitoring hosts to be connected to the same serial port of the answering type equipment, wherein the two monitoring hosts are connected through double-computer heartbeat communication;
selecting a monitoring host to distribute a leading right, and setting the cut-off time of the leading right; the dominant right is the right to send a request to the answering device; the deadline is updated to the time point of the current heartbeat packet plus a preset time period along with the updating of the heartbeat packet;
the monitoring host with the distributed master right informs the other monitoring host of the deadline and the master right distribution result through a heartbeat packet;
before the expiration time expires, the monitoring host with the dominant right sends a request to the answering equipment, and the two monitoring hosts receive and analyze the response message returned by the answering equipment;
and if the data acquisition state of the monitoring host with the master right is abnormal, switching the master right.
Further, if the dual heartbeat between the two monitoring hosts is abnormal, the deadline time cannot be updated through the heartbeat packet, and the deadline time expires, then:
if the time is not longer than t2 from the time point when the answering device receives the answering message last time, the monitoring host computer which has the master right last time continues to hold the master right;
and if the time is longer than t2 from the time point of receiving the response message from the answering type equipment last time, the monitoring host with the master right sends a request and analyzes the response to the host.
Further, the selecting a monitoring host to assign the master right includes:
within the time t1 when the two monitoring hosts are started, the two monitoring hosts do not send requests to the answering equipment;
if the time t1 later, the double-machine heartbeat between the two monitoring hosts is normal; one monitoring host executes the master right distribution; detecting the data acquisition state of a monitoring host executing the master right distribution, and if the data acquisition state is normal, the monitoring host holds the master right; otherwise, detecting the data acquisition state of another monitoring host, and if the data acquisition state is normal, the monitoring host holds the leading right; otherwise, sending out alarm information.
If the time is t1 later, the double-computer heartbeat between the two monitoring hosts is abnormal; the two monitoring hosts respectively send requests to the answering equipment; if the response message received for the first time is the request for the machine, the local machine does not send the request any more, and the dominant right is held for the machine; if the response message received for the first time is requested by the local computer, the local computer holds the master right;
further, the method for switching the master right comprises the following steps:
the monitoring host executing the master right distribution detects the data acquisition state of the monitoring host not holding the master right, and if the data acquisition state is normal, the monitoring host is switched to hold the master right; otherwise, sending out alarm information.
Further, the time t2 is three times the UPS sensor data collection period.
Further, the time of t1 is three times of the double heartbeat cycle.
Further, the answering device is a UPS sensor.
In another aspect, a system for implementing responsive two-way data acquisition is provided, comprising: two monitoring hosts and answering type equipment, wherein the two monitoring hosts are connected to the same serial port of the answering type equipment and execute the method for realizing answering type two-way data acquisition according to any one of claims 1 to 7.
In a third aspect, a system for implementing responsive two-way data acquisition is provided, including: the method comprises two monitoring hosts and a plurality of answering type devices, wherein the two monitoring hosts are respectively connected to the same serial port of each answering type device, and the method for realizing answering type two-way data acquisition disclosed by any one of claims 1-7 is executed corresponding to each serial port.
Further, the system for implementing responsive two-way data acquisition of claim 8 or 9, comprising: the two monitoring hosts are a main monitoring host and a standby monitoring host, and the priority of the distribution main priority of the main monitoring host is higher than that of the standby monitoring host.
Compared with the prior art, the method has outstanding substantive characteristics and remarkable progress, and particularly, firstly, a method for distributing the master right is adopted, only one monitoring host is limited to send the request at the same time, so that the problem of disorder of received collected data caused by sending the requests at the same time is avoided; secondly, a single serial port of the same UPS sensor connected with a set of monitoring host has independent main right judgment logic, the serial ports are not influenced with each other, and the logic independence is strong; thirdly, scenes such as serial port connecting line faults, host power failure, heartbeat abnormity and the like are considered, and the fault tolerance is high; finally, the method for realizing responsive type two-way data acquisition can be adopted for the two-way data acquisition of all responsive devices, and the universality is high.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the present invention.
Fig. 3 is a schematic flow chart of a method for allocating a master right to one of the monitoring hosts after the monitoring hosts are restarted after a power failure.
FIG. 4 is a flow chart illustrating a method for assigning a master right when the deadline expires in accordance with the present invention.
Fig. 5 is a schematic diagram of a method for switching master rights when monitoring a host serial port connection failure according to the present invention.
Fig. 6 is a flow chart illustrating the assignment of the master rights of the two-way data acquisition method of the answering machine of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
Example 1
The embodiment provides a method for realizing two-way data acquisition of answering equipment, which comprises the following steps:
configuring two monitoring hosts to be connected to the same serial port of the answering type equipment, wherein the two monitoring hosts are connected through double-computer heartbeat communication;
selecting a monitoring host to distribute a leading right, and setting the cut-off time of the leading right; the dominant right is the right to send a request to the answering device; the deadline is updated to the time point of the current heartbeat packet plus a preset time period along with the updating of the heartbeat packet;
the monitoring host with the distributed master right informs the other monitoring host of the deadline and the master right distribution result through a heartbeat packet;
before the expiration time expires, the monitoring host with the dominant right sends a request to the answering equipment, and the two monitoring hosts receive and analyze the response message returned by the answering equipment;
and if the data acquisition state of the monitoring host with the master right is abnormal, switching the master right.
The two monitoring hosts are connected with the same serial port through serial port expansion equipment, the leading right is divided, the cut-off time is set, and the behavior that the two monitoring hosts simultaneously send requests to the answering equipment is stopped from a time node, so that the problem that data received by the monitoring hosts are disordered is avoided.
The two monitoring hosts can be connected with the same serial port of the same answering type equipment through serial port extension equipment respectively, and the two monitoring hosts collect the data of one answering type equipment by using the method for realizing answering type two-way data collection; the two monitoring hosts can also be simultaneously connected with the same serial port of the two answering type devices, and the two monitoring hosts can simultaneously acquire the data of the two answering type devices by using the method for realizing answering type double-path data acquisition.
The distribution right of the master right can be fixedly held by a preassigned monitoring host, can also be fixedly held by a randomly selected monitoring host, and can also be alternately held with the distribution right as required. The monitoring host that assigns the master right has a right to preferentially obtain the master right.
The monitoring host which distributes the master right informs the owner of the master right and the deadline time through each heartbeat packet; before the expiration of the deadline, continuously updating the deadline to be the time point of the current heartbeat packet plus a preset time period; and if the deadline time is not updated any more until the double-machine heartbeat is abnormal, the deadline time is expired after a preset time period. In addition, the monitoring host that assigns the master right may also inform the owner of the master right and the deadline through heartbeat packets at fixed intervals, for example, informing the owner of the master right and the deadline once every two heartbeat packets.
The method for distributing the master right considers the problems of monitoring the serial port connection failure of the host, abnormal heartbeat of the host and power failure restart of the monitoring host; further monitoring for host reboot conditions includes: the method for realizing responsive two-way data acquisition has other problems to cause the situation that the method needs to be executed again, namely the situation of starting operation for the first time; as shown in fig. 6, different strategies are adopted for different problems, so that the monitoring efficiency is improved in a word without adding an additional serial port, and the two-way data acquisition method for the answering equipment is strong in universality and suitable for two-way acquisition of all answering equipment.
Abnormal data collection status, switching of dominance
Before the expiration time expires, that is, during the period, the dual-computer heartbeat is normal, the expiration time is continuously updated along with the heartbeat packet, but a serial port of the monitoring host having the master right has a problem, which causes a failure in sending a request by the monitoring host, and also fails to receive a response message, and at this time, if a data acquisition state is abnormal, another monitoring host is switched to hold the master right, as shown in fig. 5, the specific method is as follows:
the monitoring host executing the master right distribution detects the data acquisition state of the monitoring host not holding the master right, and if the data acquisition state is normal, the monitoring host is switched to hold the master right; otherwise, sending out alarm information.
After the master right is switched, the monitoring host executing the master right distribution also informs the owner of the master right and the updated deadline time of the master right through each heartbeat packet.
The data acquisition state is determined according to whether the response message of the response type equipment can be received within a certain time, and if the response message can be continuously received, the data acquisition state of the monitoring host with the dominant right is good; and if the two monitoring hosts can not receive the response message within a certain time, the data acquisition state of the monitoring host with the dominant right is abnormal.
Specifically, as shown in fig. 5, the monitoring host a holds the master right, and the monitoring host a performs allocation of the master right; the monitoring host A distributes the master right according to the data acquisition state, and then informs the monitoring host B of the attribution and the deadline time of the master right through a heartbeat packet; the cutoff time is the sum of the current heartbeat packet time point and a preset time T; when the serial port line connection between the monitoring host A and the answering type equipment fails, the request sent by the monitoring host A cannot be received by the answering type equipment, the answering type equipment does not send a response message, and the monitoring host A, B cannot receive the response message within a certain time, so that the data acquisition state of the monitoring host with the main right is judged to be abnormal, the monitoring host B is switched to have the main right, and meanwhile, the monitoring host A sends a failure alarm; the monitoring host A still informs the monitoring host B of the attribution of the master right and the deadline through a heartbeat packet; when the monitoring host B holds the master right, sufficient time is provided for recovering the connection between the monitoring host A and the serial port of the answering type equipment; similarly, when the monitoring host B is in fault connection with the serial port line of the answering type equipment, the switching monitoring host A holds the leading right, and meanwhile, the monitoring host B sends out a fault alarm.
Monitoring host power-down restart
As shown in fig. 3, the method for assigning a master right to one of the monitoring hosts includes:
within the time t1 when the two monitoring hosts are started, the two monitoring hosts do not send requests to the answering equipment;
if the time t1 later, the double-machine heartbeat between the two monitoring hosts is normal; one monitoring host executes the master right distribution; detecting the data acquisition state of a monitoring host executing the master right distribution, and if the data acquisition state is normal, the monitoring host holds the master right; otherwise, detecting the data acquisition state of another monitoring host, and if the data acquisition state is normal, the monitoring host holds the leading right; otherwise, sending out alarm information.
If the time is t1 later, the double-computer heartbeat between the two monitoring hosts is abnormal; the two monitoring hosts respectively send requests to the answering equipment; if the response message received for the first time is the request for the machine, the local machine does not send the request any more, and the dominant right is held for the machine; if the response message received for the first time is requested by the local computer, the local computer holds the master right;
preferably, the time of t1 is three times of the double heartbeat cycle.
When the monitoring host cannot recover automatically after power failure, the double-computer heartbeat is abnormal, and the monitoring host needs to be manually restarted to recover stable double-computer heartbeat; in addition, the method also comprises the following steps,
the method for realizing the answering type two-way data acquisition has the problems that the method needs to be executed again due to other problems, and stable double-machine heartbeats need to be established firstly when the method is operated and started for the first time.
Considering that the monitoring host needs several heartbeat packet times to determine whether a stable heartbeat is established, the monitoring host does not send a request to the answering device within a set time t1, and the stability of the two-machine heartbeat is determined through three heartbeat cycles.
If the double-computer heartbeat is not recovered after t1 time, the monitoring host still has abnormity, and the two monitoring hosts respectively send requests to the answering type equipment; if the response message received for the first time is a request for the machine, the local machine does not send the request any more, the master right is held for the machine, the request is sent for the machine, and the two monitoring hosts analyze the response; if the response message received for the first time is requested by the local machine, the local machine holds the main authority, the local machine sends the request, and the two monitoring hosts respectively analyze the response.
And if the double-machine heartbeat is reestablished after t1 time, the master right is distributed according to the data acquisition state of the monitoring host.
Abnormal heartbeat of two machines
If the dual heartbeat between the monitoring hosts is abnormal, the deadline time cannot be updated through the heartbeat packet, and the deadline time expires, as shown in fig. 4, then:
if the time is not longer than t2 from the time point when the answering device receives the answering message last time, the monitoring host computer which has the master right last time continues to hold the master right;
and if the time is longer than t2 from the time point of receiving the response message from the answering type equipment last time, the monitoring host with the master right sends a request and analyzes the response to the host.
Preferably, the time of t2 is three times of the data acquisition cycle of the answering equipment, three acquisition cycles are reserved to eliminate factors of response message delay and response message packet loss, and whether the response message can be received is judged more accurately.
When the monitoring host with the master right works normally, the other monitoring host can work normally or not work, and only other problems cause abnormal heartbeat of the two computers; at this time, the monitoring host with the master right normally sends a request, the answering equipment still sends response messages to the two monitoring hosts, and as the monitoring host can continuously receive the response messages, the time until the response messages are received from the answering equipment last time does not exceed t2 time, the monitoring host with the master right last time continues to hold the master right;
when the monitoring host with the master right does not work, which causes abnormal heartbeat of the two monitoring hosts, the other monitoring host works normally; at this time, if the monitoring host with the master right does not work, the monitoring host with the master right does not send a request any more, the answering device does not receive the request and does not send a response message, and after t2 time, the monitoring host with the master right sends a request and analyzes a response to the host autonomously.
Example 2
The difference between this embodiment and embodiment 1 is that the answering device is a UPS sensor, the monitoring host includes a monitoring host a and a monitoring host B, the monitoring host a and the monitoring host B are electrically connected to the same serial port of the UPS sensor through a serial port extension device, and the method for implementing answering type two-way data acquisition in embodiment 1 is implemented.
Example 3
The embodiment provides a system for implementing answering-type two-way data acquisition, as shown in fig. 1, which includes two monitoring hosts and answering-type equipment, where the two monitoring hosts are connected to a same serial port of the answering-type equipment, the method for implementing answering-type two-way data acquisition described in embodiment 1 is executed, and the method for allocating master rights described in embodiment 1 is executed.
Example 4
This example differs from example 3 in that: a system for implementing responsive two-way data acquisition is provided, as shown in fig. 2, and includes two monitoring hosts and a plurality of responsive devices, where the two monitoring hosts are respectively connected to a same serial port of each responsive device, and execute the method for implementing responsive two-way data acquisition described in embodiment 1 corresponding to each serial port, and execute the method for assigning master rights described in embodiment 1.
Example 5
The present embodiment is different from embodiments 3 and 4 in that: the two monitoring hosts are a main monitoring host and a standby monitoring host, and the priority of the distribution main priority of the main monitoring host is higher than that of the standby monitoring host.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. A method for enabling responsive two-way data acquisition, the method comprising:
configuring two monitoring hosts to be connected to the same serial port of the answering type equipment, wherein the two monitoring hosts are connected through double-computer heartbeat communication;
selecting a monitoring host to distribute a leading right, and setting the cut-off time of the leading right; the dominant right is the right to send a request to the answering device; the deadline is updated to the time point of the current heartbeat packet plus a preset time period along with the updating of the heartbeat packet;
the monitoring host with the distributed master right informs the other monitoring host of the deadline and the master right distribution result through a heartbeat packet;
before the expiration time expires, the monitoring host with the dominant right sends a request to the answering equipment, and the two monitoring hosts receive and analyze the response message returned by the answering equipment;
and if the data acquisition state of the monitoring host with the master right is abnormal, switching the master right.
2. The method of claim 1 for enabling responsive two-way data collection, wherein: if the double-machine heartbeat between the two monitoring hosts is abnormal, the deadline time cannot be updated through a heartbeat packet, and the deadline time expires, and then:
if the time is not longer than t2 from the time point when the answering device receives the answering message last time, the monitoring host computer which has the master right last time continues to hold the master right;
and if the time is longer than t2 from the time point of receiving the response message from the answering type equipment last time, the monitoring host with the master right sends a request and analyzes the response to the host.
3. The method of claim 1, wherein said selecting a monitoring host to assign a master right comprises:
within the time t1 when the two monitoring hosts are started, the two monitoring hosts do not send requests to the answering equipment;
if the time t1 later, the double-machine heartbeat between the two monitoring hosts is normal; one monitoring host executes the master right distribution; detecting the data acquisition state of a monitoring host executing the master right distribution, and if the data acquisition state is normal, the monitoring host holds the master right; otherwise, detecting the data acquisition state of another monitoring host, and if the data acquisition state is normal, the monitoring host holds the leading right; otherwise, sending out alarm information;
if the time is t1 later, the double-computer heartbeat between the two monitoring hosts is abnormal; the two monitoring hosts respectively send requests to the answering equipment; if the response message received for the first time is the request for the machine, the local machine does not send the request any more, and the dominant right is held for the machine; if the response message received for the first time is requested by the local machine, the local machine holds the dominant right.
4. The method of claim 1, wherein switching the master authority comprises:
the monitoring host executing the master right distribution detects the data acquisition state of the monitoring host not holding the master right, and if the data acquisition state is normal, the monitoring host is switched to hold the master right; otherwise, sending out alarm information.
5. The method of claim 2 for enabling responsive two-way data collection, wherein: the time t2 is three times the period of the data acquisition of the answering machine.
6. A method of implementing responsive two-way data collection as claimed in claim 3, wherein:
the time of t1 is three times of the double heartbeat cycle.
7. Method for the realization of an answerable two-way data acquisition according to any of the claims 1-6, characterized in that:
the responsive device is a UPS sensor.
8. A system for realizing answering type two-way data acquisition is characterized in that: the method comprises two monitoring hosts and answering equipment, wherein the two monitoring hosts are connected to the same serial port of the answering equipment, and the method for realizing answering two-way data acquisition as claimed in any one of claims 1 to 7 is executed.
9. A system for realizing answering type two-way data acquisition is characterized in that: the method comprises two monitoring hosts and a plurality of answering type devices, wherein the two monitoring hosts are respectively connected to the same serial port of each answering type device, and the method for realizing answering type two-way data acquisition disclosed by any one of claims 1-7 is executed corresponding to each serial port.
10. A system for performing responsive two-way data acquisition as claimed in claim 8 or 9, wherein: the two monitoring hosts are a main monitoring host and a standby monitoring host, and the priority of the distribution main priority of the main monitoring host is higher than that of the standby monitoring host.
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