TW200843405A - Method of managing network redundancy-checking programs - Google Patents

Abstract

The invention is generally about a method of managing network redundancy-checking programs, and more particularly about a redundancy-checking and managing method under a dual-channel network structure composed of a master control end, a primary transmission channel, a secondary transmission channel, intermediate devices, and remote devices. The invention is characterized by that a COM port under the plural network communication addresses in the master control end is simulated into a single virtual COM port by a driver program of the master control end. As such, a user or a user's application program only needs to manage or monitor the virtual COM port. Since the firmware of the intermediate devices and the driver program already covers all actual operation modes, the user and the user's application program are thereby free from the system complexity resulted form the redundancy mechanism. In other words, the invention is capable of providing the high reliability offered by the two transmission channels without the overhead of managing a large number of COM ports resulted from the two transmission channels.

Description

200843405 4 t IX. Description of the invention: [Technical field of the invention] The invention virtualizes the communication under the plurality of network communication addresses in the main control terminal into a single communication port through the driver in the main control terminal, and The virtual communication then determines whether the sequence data to be transmitted is invalid or duplicated by a redundancy check mechanism, thereby achieving the effect of having both a redundancy check mechanism and the advantage of managing a single network communication address. [Prior Art] According to the rapid evolution of communication technology, its derivative communication network has also developed rapidly. 'Depending on the size, it can be divided into regional network and wide area network, where 'regional network is composed of many The regional network completed by the same transfer architecture, and the wide area network is a large network composed of many regional networks, and its services and connections can be spread all over the country and even the whole world. Whether it is a regional network or a wide area network, the most common basic architecture is Ethernet, and in Ethernet, there are hubs that use optical fibers or stranded cables for transmission lines. Network relay devices such as _ (switch) or router (RQuter), and the combination of network relay devices and transmission lines can enable different network areas, as well as computers or other mobile devices, such as monitoring systems, security System and automation are transferred to transfer or control data or instructions. However, the traditional commercial Ethernet equipment is only suitable for the simple and easy to use 5 200843405 & the office is excellent, but it is not for the industrial environment that is difficult to detect and cannot be turned over. The network equipment is not in line with the high demand of C industry, which has also promoted the development of industrial Ethernet. In addition, with the logic of the lion's logic, the towel processor and various output/human devices and the X industry, such as the system or the flops, the software and hardware manufacturing waste merchants also began to provide money-attached Ethernet. Lusuke_products have also accelerated the revolutionary development of industrial Ethernet networks; however, due to the complexity of commercial and industrial Ethernet networks, they will no longer be limited by existing automated Weishang. The proprietary agreements and secrets have also prompted many organizations and associations to promote the Ethernet industry agreement, allowing industrial control equipment to be integrated into common agreements. However, please refer to the sixteenth figure, which is the Ethernet transmission system of the dual transmission channel of the conventional technology. The system under this architecture mainly includes the host A, the main transmission channel B, and the vice. The transmission channel C, the relay device D and the remote end are also composed of parts such as E. The main transmission channel B and the sub-transmission L channel C under the system are mainly designed to meet the high reliability requirements in industrial Ethernet applications. _, however, the body of the car with the hardware of the _ dual transmission channel or _ correction is the profit detection system to determine the channel that the master A will select, and the so-called redundancy check is Use the extra Wei in the data transmission packet to verify the algorithm. 6 200843405 However, compared with the traditional Ethernet network, the architecture is based on the protection layer of the Ethernet network. This network device only needs __ network communication address (but p address). If the network is connected to the serial device or for some industries, the user needs two sets of Ethernet and two sets of network communication addresses. This way, not only can the physical medium of the computer be used, but also the protection. The side of the ugly interface and the scale of his equipment, the above two groups of network communication bits _ with the redundancy check _, (four) money for network backup and quickly call the network light ship, so redundant check money Running an industrial Ethernet communication plays a very important role. The above-mentioned several-channel Ethernet system has the ability to quickly reply to the network connection and its redundant backup mechanism can meet the needs of industrial applications to ensure the smooth operation of the overall industrialized Ethernet system. However, the dual-channel redundant backup m has a lack of τ in the implementation: () Because the dual-channel redundant Ethernet system has two sets of transmission channels (main transmission channel 副, sub-transmission channel) c), therefore, the user of the master terminal 8 needs to separately control the two groups of transmission channels; furthermore, 'if the master terminal does not need to open different UMCOM pQrt for different transmission conditions) It is necessary to manage the red-control-multiple number of scales, so it takes two times for the manager who manages the dual-channel=remaining Ethernet system to control its pass ramp. 200843405 (2) Similarly, if the host A or remote device wants to develop related applications, it also needs to design its path_ algorithm for the communication channel (COM ροή) under dual channel. For those who want to use a dual-channel redundant Ethernet system, it takes extra time to develop a new management program to determine the switching mode and method of communication between the two channels. Therefore, the above-mentioned deficiencies in the conventional technology are necessary for those who are engaged in this industry to be improved, and it is necessary for the relevant industry to make progress and innovation. [Invention] Today's inventors have in view of the lack and insufficiency of the above-mentioned traditional Ethernet products, so the inventor and the industry's many years of research and invention experience, through continuous improvement and continuous testing, have designed this to overcome commercial B. A method of managing network redundancy checking applications that is missing from the network product. The main purpose of the present invention is to manage the redundancy check mechanism and the communication port used by the firmware formed by the driver and the relay device, so although the host side includes two network communication addresses, the user There is no need to manage the communication ports under the two network communication addresses, and therefore the user only needs to set the virtual scales for the virtual ones; furthermore, the host is determined by the judgment process of the driver. The end has the function of transmitting the same data by the main transmission channel and the sub-transmission channel, and since the user only needs to manage the virtual scale of the 200843405 ff virtual, the domain end of the EB scale can be borrowed not only The redundant check-up money is the high stability of the channel, and the managers under the framework do not have a lot of communication under the dual transmission channel. In addition, the secondary purpose of Ben Maoming is to virtualize the main transmission channel and the sub-hybrid channel into a single ifi珲α by the driver; the formula of the ^ will only need to be The data on the virtual communication port is accessed' and the original is to be upgraded to the enterprise end of the two network communication addresses for the Ethernet network that has only one network communication address. The used application $ will not need to design a new application to interact with two network communication addresses, thus saving considerable application development time and effort. [Embodiment] (In order to achieve the above object and structure, and to enable the reviewing committee to have a better understanding of the object and function of the present invention, the technical means employed in the present invention will be described as a preferred embodiment of the present invention. The details are as follows, and the full understanding of the following is made. First of all, this specification first explains the configuration of the hardware by using the flow chart of the hardware configuration method of the present invention. The technical means of the invention are finally explained by the actual application of the present invention, so that the reviewing committee can have a clearer understanding of the specific implementation technology of the present invention. Please refer to the first figure for the present invention. The architecture of the dual-channel redundant Ethernet system of the preferred embodiment is clearly shown in the figure. The system is composed of the main control terminal 1, the main transmission channel 2, the secondary transmission channel 3, and the relay device 4. The main control terminal 1 further includes a plurality of workstations 1 1 , 1 2 , 13 and 14 . In addition, the main transmission channel 2 and the secondary transmission channel 3 in the system are adapted to cooperate with the industrial B. For the networked application, the architecture designed under the redundancy check requirement is used. Please refer to the second, third and fourth figures, respectively, for transmitting data to the relay device by the master terminal according to a preferred embodiment of the present invention. The schematic diagram, the schematic diagram of transmitting the packet data by the main control end, and the diagram of transmitting the data by the main control end and performing the encapsulation, as shown in FIG. 2, when the workstation 1 of the main control terminal 1 is respectively composed of the main transmission channel 2 and the vice When the transmission channel 3 transmits the sequence number 00〇〇0〇〇2 two groups of code I frames to the relay device 4, since the redundancy check mechanism of the relay device 4 avoids duplication of transmission data, the relay device 4 will The duplicate sequence numbers 00001 and 00002 will be ignored (dr 〇p ), so that the relay device 4 can further transmit the 〇〇〇〇1 and 〇〇〇〇2 two groups of code frames to the far end. However, when the workstation 11 transmits/sequences 5 2 to the relay device, the heart station 'workstation 1 1 will pack the sequence 5 2 into a pass-through packet ^ ' and the relay device 4 will mainly contain the mark (mark ), length 200843405 (len), sequence number (sequence number) and The head of the checksum 5i and the sequence data 5 2 reference map m station 11 wants to transmit - sequence data 5 2, / sequence becai bucket 5 2 will pass the - redundancy mechanism, and the redundancy mechanism is mainly The header 51 is added to the sequence data 52 to form a transmission packet 5, and the combination is a carrier package 5 (as shown in FIG. 3);

The redundancy mechanism then duplicates the _ _ round packet 5 and divides the primary transmission channel 2 and the secondary transmission channel 3 to transmit the relay device 4; for example, through the above redundant mechanism and the primary transmission channel 2 and the _transmission channel 3, the workstation Completion will enable two identical listeners to transmit to the Difficulty 4, but will not cause duplication of data at the receiving end. The tea is shown in the fifth and sixth figures, which are respectively a schematic diagram of transmitting data to the main control terminal by the relay device according to a preferred embodiment of the present invention, and a schematic diagram for performing redundancy check by the device relay device. After the device 4 receives a 〇0(10)1 code frame from the far end and wants to transmit it to the Guardian station ,, the button header 5 丄 adds the sequence data 52 to form a transmission packet 5, and then the main transmission channel 2. The sub-transmission channel 3 is transmitted to the workstation i1, and the workstation is connected to the workstation 1/1. The workstation engineer will ignore the duplicate code frame; however, the redundancy and inspection are shown in the figure shown in Figure 6, when they have the same serial number (

SeqUenCe number) (^Sno = 8) The round packet 5 is to be transmitted to the work 11 by the main transmission channel 2 and the sub-transmission channel 3 200843405 • #1 station 1 1 will undergo a redundancy check, which is mainly The headers 5 1 of the two sets of transport packets 5 (including the tag, the length, the serial number, and the checksum) are compared; therefore, after this redundancy check, the workstation 11 will not receive the duplicated data. However, the above-mentioned redundancy check mechanism mainly includes a step of judging the data written by the driver to write the network card (see Figure 7). The steps are as follows: ^

(1〇1) starts; Q 0 2) Confirms that '_程歧" obtains the sequence data to be transmitted by the L-type L2, and if not, executes the step (person) to configure the memory for the header 51. Steps 3 3); (1〇4) insert the header 51 into the sequence data 5 2 to form a transfer packet 5 and assign the value of the header 51; (1) (1〇5) copy the entire revolving packet 5 ( Header 51 and sequence data μ), attack the main transmission channel 2, if it fails, execute, 丄U Γ ); if successful, execute (丄〇8) · (1071 transmission packet 5 対 (dlscard) or ignore (drop ) ; % ( 12 200843405 (1〇8) Place the transmission packet 5 on the secondary transmission channel 3, if it fails, execute (1〇9); if successful, execute (丄丄〇); (1〇9) will transmit the packet 5 discard (discard) or ignore (drop); (110) end. - 'With the above-mentioned descriptive inspection mechanism, the driver corresponding to the step of writing to the network card _ the driver includes the driver shown in Figure 8. The program steps to read data from the network card, the steps are as follows: (2 01) start; Q 0 £ material can be read, if no step (2 1 1 ί 2 0 3) confirm the relay is set 4 Buffer area ( buf " ) Is it blank (it was read from the network before storage, but this fashion can not form - a buffer of the complete packet), if not, then take the second step (2 Q 4); if yes, the step of the job (2 〇5)

J (2 0 4): The data of the saved network card is taken out and inserted into the buffer area. The front end is 'for example', when this happens, the transmitted packet is 3〇byt es, but the receiving end is first. 10 byt esW, but this 1 /, bytes is not - the complete pass packet, must wait until the end of 13 200843405 2Qbytes # material can be - check the header and subsequent processing, so the front ^ 〇 Bytes need to be put into the buffer first, but when 2 〇bytes arrives, insert 1〇bytes in the buffer into the front end of 2〇bytes; (2 0 5) Check head 5! Is it correct, otherwise execute Step (2 〇 6); if yes, execute step (2 〇 7); (2 0 6) discard or ignore the data; end; (2 〇 7) perform redundancy check, if the data cannot be processed, execute Step (2 0 2); (2 0 8) Whether the ordering ship of the wire head 5 1 is correct, if otherwise, execute the step (2 0 6 ); less (2 0 9) to transmit the data to the user's application; If it fails, perform the step (2 0 6); (210) Check whether the data in the buffer area is complete; if not, execute (2 0 2 ); (211) End. In short, by reading and writing the network card through the Xiang-driver shown in Figure 7 and the person, you can learn how to pass the driver and pass the main transmission channel 2 and the sub-transmission channel 3. To achieve the management of the present invention 14 200843405 1 », a number of methods for checking the application; however, the present invention also includes writing data to the network card through a body (as shown in Figure 9) and reading from the network card through the body. Steps of taking the data (Figure 10), the steps are as follows: (3 01) start; (3 0 2) confirm that the relay device 4 reads data from its serial port, and if not, perform the step (3 0 2 (3 0 3 ) configure memory for the header 51. If it fails, perform step (3 " 0 3); (3 0 4) insert the header 5 before the sequence data 52 to form a transport packet 5 and assign The value of the header 51; (3 0 5 ) copy the entire transport packet 5 (header 51 and sequence data 5 2 ); (3 0 6 ) place the transport packet 5 on the main transport channel 2, if it fails, execute (3 0 7 ); if successful, execute (3 0 8); (3 0 7) discard or drop (drop) the transport packet 5; (3 0 8) transmit packet 5 Place the secondary transmission channel 3, if it fails, execute (3 0 9 ); if successful, execute (310); (3 0 9 ) discard the transport packet 5 (di scard or ignore); (310) ends. 15 200843405 'Furthermore, please refer to the process of reading data from the network card as shown in the following figure (Figure 10). The steps are as follows: (4 01) Start; (4 0 2) Whether the _ body is from the network The path is cut to the data. If not, execute the command (4 1 1); Tv (4 0 3 ) to confirm whether the buffer area is blank. If no, execute step (404) Β

C

υ , right 疋, then perform the stepsΓ

4 0 5 ) ; V (4 0 4) Take out the data of the saved network card and insert it into the buffer area; Month" C 4 0 5) Check if the header 5 is correct, if the steps are executed ( 4 〇6); if yes, execute step (4〇7); (4 0 6) discard or ignore the data; end; (4 0 7) check the processing, if this can not be processed

Step (4 0 2); T (4〇8) Check whether the serial number of the header 51 is correct, if otherwise, perform the step (4 0 6 ); , (4 0 9) the Lecture will relay the data to the person. 4 series of 璋; if the step (4 〇 6); right defeat U 1 0) check the buffer area # material is looking for the whole; material 4 0 2); Ding 1 16 200843405

I (41 1) ends. In summary, by the methods disclosed in the process of _7, VIII, IX and IX, you can clearly understand the gamma || by He Chengru and the implementation steps to achieve redundancy check of the transmission data, and then By applying the above method to the program used by the user, the program can regard the main transmission channel 2 and the sub-transmission channel 3 as single-transmission channels, whereby the relevant operator of the application can A new application needs to be developed to use an Ethernet network with a dual channel redundancy check mechanism. However, in order to enable the review board to better understand the advantages of the present invention in practice, please refer to the interface diagrams shown in the tenth, twelfth, thirteenth, fourteenth and fifteenth, assuming that the user wants The management relay device 4 is connected to the top of the device. The user first increases the number of ports to be managed through the interface shown in FIG. 10, and then detects and relays the device through the interface of FIG. A set of transmission channels (such as the primary transmission channel 2 and the secondary transmission channel 3) connected, when the workstation 11 detects two network communication addresses on the relay device 4 (1P address) (as shown in FIG. 13) The user can further specify the data ρ (data ρ 〇rt) and the command port to be opened. However, until now, although the workstation 11 detects two network communication addresses, the user actually The setting is only for one virtual communication port, that is, when the user sets the communication port in FIG. 14, the user directly specifies the main transmission channel 2 (for example, i 9 2 17 200843405 8 2 · 1〇0) ), sub-transmission channel 3 (such as work 9 2 · work 6 8 3 · 1 〇 0 In addition, if the above action is repeated at the two-way communication address, the user can set multiple groups of communication ports (p 0 rt) 'however, as shown in Figure 15, although at the workstation 1 A total of 32 communication ports are set, but for the user or user application =, only 16 communication ports will need to be managed or monitored. *, ,: The judgment based on the Weishou body to provide redundancy check in this paper is only a more economic example of the method of the official network redundancy check application of the present invention, and is mainly implemented in the implementation. It is the virtual transfer of two or more passscales, and the method of using the driver to virtualize two or more communication messages into a single---------------------------- In her special gj, the mechanical secrets and equivalent structural changes, Xiao Ying _ is included in the patent of this creation, and is given to Chen Ming. - By the above description, it can be seen that the present invention has the following advantages and features in comparison with the technology of the system: (1) by the purchase of the program and the formation of the medium, although the host side includes the side-way Communication address, but the user does not need to manage the communication iterations under the two network communication addresses, so the user only needs to set a virtual communication port; in addition, the driver is hunted by the driver. In the judgment process, although the host side has the function of transmitting the same data to the primary transmission channel 18 200843405 and the secondary transmission channel, and since only the virtual communication port is managed for the user, the Ethernet architecture is adopted. The host side can not only maintain the high stability brought by the dual transmission channel through the redundancy check mechanism, but the administrator under the architecture does not need to manage a large number of communication ports derived from the dual transmission channel. (2) By using the driver to virtualize the two network communication addresses used by the primary transmission channel and the secondary transmission channel into a single communication port, the application on the host side only needs to access the data on the virtual communication port. Therefore, if you want to upgrade to a network communication address for an Ethernet network with only one network communication address, the application under the Ethernet architecture will not need to design a new application. Network communication addresses are used to access, so it can save considerable application development time and effort. (3) Whether the data is to be transmitted to the host through the relay device or the host is to transmit data to the relay device, the redundancy check is used to determine whether the serial numbers in the data packet are the same, and if they are the same, one of them will be the same. The group data packet is ignored or abandoned, so that the receiving end can avoid the repeated data packet received; in addition, the data under the redundancy checking mechanism will be added to the -sequence ship, so the data is intended to be transmitted by the main transmission channel and The secondary transmission channel transmits, and the communication information of the data in the primary transmission channel and the secondary transmission channel needs to be the same, thereby ensuring that the data is indeed = 19 200843405 u - The primary transmission channel and the secondary transmission channel are simultaneously transmitted. (4) Furthermore, under the redundancy check mechanism of the present invention, if the host side or the relay skirt is placed within a certain time limit (TI ME-OUT), the packet information of the same serial number is not received, the relay device may issue A warning message is sent to the workstation of the master terminal, thereby alerting the network administrator to check whether the transmission channel is disconnected or incorrect. However, the above disclosure is only a preferred embodiment of the present invention, and the scope of the invention is not limited thereto, and therefore, the scale modification of the patent application of the present invention should still be included. Within the scope of the patents covered by the present invention. In summary, the method for managing the network redundancy check application of the present invention can indeed make its effect and purpose, so the invention is sincerely - the invention of the excellent secret is in conformity with the application requirements of the patent for the hair of the month. In line with industrial utilization, novelty and progressiveness, 提出 apply in accordance with the law, and hope that the trial committee will grant this case as soon as possible to protect the inventor's hard work, and the new Xiaoqi shooting any doubts, please don't hesitate to instruct the inventor to do his best. Coordination, real sense of public. '20 200843405 BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a schematic diagram of a two-channel redundant Ethernet system architecture according to a preferred embodiment of the present invention. The first figure is a schematic diagram of transmitting data from a host to a relay device in accordance with a preferred embodiment of the present invention. The first figure is a schematic diagram of transmitting packet data by the master terminal in accordance with a preferred embodiment of the present invention. The fourth figure is a schematic diagram of the main control end transmitting data and encapsulating the packet according to the preferred embodiment of the present invention. The fifth figure is a schematic diagram of transmitting data from the relay device to the main control terminal according to a preferred embodiment of the present invention. The figure is a schematic diagram of transmitting data by a relay device and performing redundancy check according to a preferred embodiment of the present invention. "The figure is a flow chart of the judgment steps of the driver to write data to the network card in the preferred embodiment of the present invention. Figure 8 is a flow chart showing the steps of the driver to read data from the network card in accordance with a preferred embodiment of the present invention. The ninth figure is a flow chart of the determining step of the dynamic body writing data to the network card according to the preferred embodiment of the present invention. Figure 10 is a flow chart showing the steps of reading the 200843405 data from the network card through the blade body in accordance with a preferred embodiment of the present invention. The eleventh figure is an operation interface diagram (1) of a preferred embodiment of the present invention. The twelfth figure is an operation interface diagram (2) of the preferred embodiment of the present invention. Figure 13 is a diagram (3) of the operation interface of the preferred embodiment of the present invention. Figure 14 is a diagram (4) of the operation interface of the preferred embodiment of the present invention. The fifteenth figure is an operation interface diagram (5) of a preferred embodiment of the present invention. Figure 16 shows the architecture of an Ethernet system with dual transmission channels for the prior art. [Main component symbol description] 1. Main control terminal 1, workstation 13, workstation 2, workstation 14, workstation 2, main transmission channel 3, secondary transmission channel 4, relay device 22 200843405 5 2. Sequence data 5, transmission packet 5 1. Header A, master terminal B, primary transmission channel C, secondary transmission channel D, relay device E, remote device 23

Claims (1)

200843405 X. Patent application scope: 1. A method for managing network redundancy check application, especially for dual channel formed by master control, primary transmission channel, secondary transmission channel, relay device and remote device. The method of redundantly checking an application under the network architecture is characterized in that: through the driver in the main control terminal, the communication under the plurality of network communication addresses in the main control terminal is virtualized into a single communication port, This user or user's application only needs to manage or monitor the virtual communication port. f , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .埠 and the command 珲 communication 埠. 3. The method for managing a network redundancy check application according to claim 1, wherein when the master wants to transmit a sequence of data to the relay device, the sequence of poor materials passes through the virtual communication and The sequence data is encapsulated into a transport packet, such as the method for managing a network redundancy check application according to claim 1, wherein the transport packet includes a header and sequence data. The method for managing a network redundancy check application as described in claim 4, wherein if the sequence data is simultaneously transmitted on the primary transmission channel and the secondary transmission channel, the network under the primary transmission channel and the secondary transmission channel The communication address of the communication address needs to be the same. The method of managing a network redundancy check application described in item 4 of the patent scope is described in the method of 2008 20080405, wherein the header includes a mark, a length, a serial number, and a checksum. 7. The method of managing the ugly redundancy check application program, wherein the driver includes a method for writing sequence data into the network card of the host, and the method includes: a. Confirming and driving the program to obtain the sequence data to be transmitted from the application used by the user; ^ b, transferring the header to the network card configuration memory; C, inserting the header into the position of the sequence data Forming a transmission packet; d, assigning a value of the header; e, copying the Wei transmission packet to the primary transmission channel and the secondary transmission channel; f, discarding or ignoring the duplicate transmission packet. 8. If you want to use the special machine to tear the management network and check the program, 'the driver includes the method of reading the _ poor material from the network card in the host, including: a Exactly, whether there is data in the network buffer can be read; b. Confirm whether the buffer area of the device is blank; c. Except the sequence data stored in the network card and insert it into the buffer area. Whether the header is correct; e, the sequence data is discarded or ignored, and the redundancy check is processed; 25 200843405 g, check whether the serial number of the header is correct; h, the application that transmits the sequence data to the user; Check if the data in the buffer area is complete. 9. The method for managing a network redundancy check application according to claim 1, wherein the driver and the relay device form a blade body including the sequence data written into the master through the firmware. The method for the network card in the end, the method comprising: a, the thief relay device reads the sequence data from the serial port; b, the relay device is to be transmitted to the header configuration memory of the network card; c. Inserting the header into the location of the sequence data to form a transport packet; d, assigning the value of the header; e, copying the entire transport packet to the primary transport channel and the secondary transport channel; f. discarding or ignoring the duplicate transport packet. The method for managing a network redundancy check application as described in the scope of the patent application, wherein the firmware formed by the driver and the relay device comprises reading a network card from the host terminal. The method includes the following steps: confirming whether the firmware reads the sequence data from the network card; b, confirming whether the buffer area of the relay device is blank; c, serializing the data of the stored network card Remove and insert the front end of the buffer area; d, check whether the header is correct; 26 200843405 e, discard or ignore the sequence data, perform redundancy check; g, check whether the serial number of the header is correct; h, the The firmware writes the sequence data to the serial port of the relay device; i. Checks whether the data in the buffer area is complete. 27