CN103188252A - Method for carrying out communications between central machine and testing terminal of distributed testing system - Google Patents
Method for carrying out communications between central machine and testing terminal of distributed testing system Download PDFInfo
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- CN103188252A CN103188252A CN2011104606661A CN201110460666A CN103188252A CN 103188252 A CN103188252 A CN 103188252A CN 2011104606661 A CN2011104606661 A CN 2011104606661A CN 201110460666 A CN201110460666 A CN 201110460666A CN 103188252 A CN103188252 A CN 103188252A
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Abstract
The invention discloses a method for carrying out communications between a central machine and a testing terminal of a distributed testing system. The method includes the following steps: the central machine of the distributed testing system issues a command to the testing terminal; the testing terminal of the distributed testing system transmits testing data back to the central machine; and the same frame structure is used in the command, issued by the central machine to the testing terminal, and in the data transmitted back from the testing terminal to the central machine. The same frame structure comprises ten parts, namely a frame header, a frame length introduction part, an address and command length instruction part, a data length instruction part, a verification mode introduction part, an address, the command, the data, a verification part and a frame end, wherein the frame lengths of the frame length introduction part, the address and command length instruction part, the data length instruction part and the verification mode introduction part are fixed, and the frame lengths of the address, the command, the data and the verification part are changeable. Through the method for carrying out the communications between the central machine and the testing terminal of the distributed testing system, a replacing process of communication software when equipment functions are changed in the distributed testing system is effectively simplified, and flexible expansion of the distributed testing system is benefited.
Description
Technical field
The present invention relates to control and the technical field of data transmission of distributed test system, relate in particular to the method for carrying out communication between a kind of center machine of distributed test system and the test terminal, be applicable to the distributed test system that comprises the substantive test terminal.
Background technology
The distributed test system that contains the substantive test terminal has in industrial production widely to be used.In test process, distributed test system needs to implement testing scheme flexibly according to the variation of tested object measurement result is controlled dynamically to the test terminal, therefore has characteristics such as physical distribution, concurrent visit, sequential sensitivity.
Distributed testing is had relatively high expectations to the flow process control of test process, need obtain global state in real time and then instruct testing process, so distributed test system is fit to adopt the centralized hierarchy of control.Equipment in the system is divided into two kinds of center machine and test terminals by function, center machine is system's control and data processing core, be used for compiling, analyzing the test result of each terminal, and send corresponding control command according to test result, the operation of control whole test system; The test terminal then is responsible for carrying out parameter test and passback test data according to the order of center machine.
Distributed test system has extensibility flexibly according to the variation with the test scale of the difference of test environment, so machine or terminal is not invariable centered by the function of certain equipment in the system, but set flexibly according to the variation of system.
In the existing distributed test macro, by center machine to the transmission of the control command of the downgoing communication of test terminal with by the transfer of data of test terminal to the uplink communication of center machine, what take is independent, different communications protocol, in this communication modes, because center machine is different with the transmission of test terminal and the mode of reception, just need change the communication software of equipment when therefore the function of equipment changes in system, this replacing process is very loaded down with trivial details and complicated for larger distributed test system.
Summary of the invention
(1) technical problem that will solve
In view of this, main purpose of the present invention is to provide the method for carrying out communication between a kind of center machine of distributed test system and the test terminal, to simplify the replacing process of distributed test system bitcom when the equipment function changing, make things convenient for the flexible expansion of distributed test system.
(2) technical scheme
For achieving the above object, the invention provides the method for carrying out communication between a kind of center machine of distributed test system and the test terminal, comprising: the center machine of distributed test system is to the test terminal transmitting order to lower levels; And the test terminal of distributed test system returns test data to center machine; Wherein, center machine adopts identical frame structure with the test terminal to center machine passback test data to the test terminal transmitting order to lower levels, and this identical frame structure comprises frame head, frame length explanation, address and order length specification, data length explanation, verification mode explanation, address, order, data, verification and postamble totally 10 parts.
In the such scheme, the frame joint length of described frame length explanation, address and order length specification, data length explanation and verification mode declaratives is fixed, and the frame joint of described address, order, data and check part is adjustable length.The basic composition unit of described frame structure is the frame joint, comprises start bit, data bit, check bit sum stop bits totally 4 parts.
In the such scheme, the center machine of described distributed test system comprises to the test terminal transmitting order to lower levels: center machine sends order to parallel all test terminals that connect; The header that each test terminal detects the hardwood structure of this order then all begins to receive this order, and according to the content of frame length explanation, address and order length specification, data length explanation and the verification mode declaratives of anchor-frame joint length in this hardwood structure, calculate the frame joint length of address, order, data, check part in this hardwood structure; Each test terminal judges whether the order of center machine sends to oneself, if then the content of this hardwood structure residual part is continued to receive in this test terminal; If not, then this test terminal stops to receive the content of this hardwood structure residual part, and deletes the information from the header part that has received; Continue to receive the test terminal of this hardwood structure residual partial content according to the command component content aware test assignment of this hardwood structure that continues to receive, and according to the data division content of this hardwood structure obtain this order under concrete test operation, according to the check part content of this hardwood structure the information of this hardwood structure is carried out verification then, if verification is correct, then after receiving the hardwood portion, namely begin test process; If check errors, then this test terminal is sent an information that retransmits order according to this hardwood structure to center machine, until can verification correct, finishes correct order and receives.
In the such scheme, the test terminal of described distributed test system returns test data to center machine, comprise: after test is finished, whether there is other test terminal to carry out communication with center machine on the test terminal monitoring parallel communication bus, if have, then this test terminal is waited for until communication and being finished, and sends test data by the parallel communication bus to center machine; If no, then send test data by the parallel communication bus to center machine; The header part that center machine detects the hardwood structure of this test data then begins the acceptance test data, which test terminal judges this hardwood structure according to the address part content of this hardwood structure then is from, and is which kind of content measurement is center machine require to carry out to this test terminal test data according to the test data of this hardwood structure passback of the command component content aware of this hardwood structure; Center machine is carried out verification according to the check part of this hardwood structure to the data of this hardwood structure, if verification is correct, then behind hardwood caudal knot bundle, the data of this hardwood structure are stored or handled, if check errors, then center machine is sent an order that retransmits test data to this test terminal, carry out the transmission again of data, correct until verification, finish correct test data and receive.
(3) beneficial effect
From technique scheme as can be seen, the present invention has following beneficial effect:
1, carries out the method for communication between the center machine of distributed test system provided by the invention and the test terminal, control command and transfer of data are gathered in identical frame structure, can in the both-way communication of center machine and test terminal, use identical frame structure, simplify the replacing process of distributed test system bitcom when equipment function changing effectively, made things convenient for the flexible expansion of distributed test system.
2, carry out the method for communication between the center machine of distributed test system provided by the invention and the test terminal, the elementary cell of frame structure is the frame joint, the frame joint can start bit be set and stop bits carries out asynchronous communication, has made things convenient for distributed test system to adopt different communication modes such as synchronous communication, asynchronous communication.
3, carry out the method for communication between the center machine of distributed test system provided by the invention and the test terminal, having the multilevel address structure can carry out the multilevel address addressing to the great amount of terminals that system comprises, and has very big capacity.
4, carry out the method for communication between the center machine of distributed test system provided by the invention and the test terminal, have the coding checkout mode that can establish flexibly, can be according to the different verification mode of different employings of test environment and test terminal.
Description of drawings
Fig. 1 is the schematic diagram of the frame structure that adopts when carrying out communication between the center machine of distributed test system provided by the invention and the test terminal;
Fig. 2 is the schematic diagram of the basic composition unit frame joint of frame structure shown in Figure 1;
Fig. 3 is the schematic diagram according to the distributed test system with multilevel address structure of the embodiment of the invention;
Fig. 4 is according to the method flow diagram that carries out communication between the center machine of the distributed test system of the embodiment of the invention and the test terminal;
Fig. 5 is the schematic diagram of the basic composition unit frame joint of the middle frame structure that adopts embodiment illustrated in fig. 4;
Fig. 6 is the schematic diagram of the middle frame structure that adopts embodiment illustrated in fig. 4.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Carry out the method for communication between the center machine of distributed test system provided by the invention and the test terminal, the center machine of distributed test system is descending up to two identical frame structures of communication processs employing of center machine passback test data to test terminal transmission order and test terminal.As shown in Figure 1, Fig. 1 is the schematic diagram of the frame structure that adopts when carrying out communication between the center machine of distributed test system provided by the invention and the test terminal.This frame structure comprises frame head, frame length explanation, address and order length specification, data length explanation, verification mode explanation, address, order, data, verification and postamble totally 10 parts, the frame joint length of parts such as wherein frame length explanation, address and order length specification, data length explanation and verification mode explanation is fixed, and the frame joint of part such as address, order, data and verification is adjustable length.The frame joint variable-length of address part can be realized the multilevel address structure, meets the system extension mode of distributed test system; The frame of command component and data division joint variable-length can arrange different length to order with data during with transfer of data in command transfer; The frame of check part joint variable-length can adopt different check codes according to channel circumstance between different center machine and test terminal different.
The basic composition unit of above-mentioned frame structure is the frame joint, and its structure can be applicable to synchronous communication and asynchronous communication as shown in Figure 2 simultaneously.This frame joint comprises start bit, data bit, check bit sum stop bits, wherein start bit is used for sign start information when communication modes adopts asynchronous communication, data bit is used for depositing the content that this frame structure each several part comprises, check digit is used for each frame joint is carried out coding checkout, and stop bits is used for sign termination message when communication modes adopts asynchronous communication.
Provided the example of the application of a frame structure among the present invention, this frame structure has been applied in as shown in Figure 3 the distributed test system with multilevel address structure.This distributed test system adopts the operation of a center machine control whole system.Center machine is by parallel connection the between parallel communication bus and each test terminal, the identical terminal distribution mode of realization priority.
Distributed test system shown in Figure 3, adopt A, B totally 2 grades of address structures, wherein A level address structure comprises 128 addresses, and B level address structure comprises 80 addresses, and these 2 grades of address structures can be controlled in real time with test data 10240 test terminals and return.Distributed test system shown in Figure 3 comprises 110 test ports in each test terminal.Table 1 has provided part order and the corresponding function of test macro, and table 2 has provided a part of verification mode and the code thereof in the hardwood structure.
| Command name | Function declaration | Direction of transfer |
| 0,001 0001 | All of the port quits work, | Descending |
| 0,001 0010 | The data bit designated port is started working. | Descending |
| 0,001 0011 | The data bit designated port quits work. | Descending |
| 0,001 0100 | The measurement data of certain port in its terminal is beamed back in the indication test terminal | Descending |
| 1,000 0001 | Terminal self testing mistake, mistake appear at the indicated port of data bit | Up |
| 1,000 0010 | The test data of terminal passback down order designated port. | Up |
Table 1: the distributed test system order for example
| Command name | Verification mode |
| 0001 | CRC-4 (generator polynomial: x4+x+1) |
| 0010 | CRC-12 (generator polynomial: x12+x11+x3+x+1) |
| 0011 | CRC-16 (generator polynomial: x16+x15+x2+1) |
| 0100 | CRC-32 (generator polynomial: x32+x26+x23+...+x2+x+1) |
Table 2: verification mode and respective code are for example in the distributed test system
Below to utilize this hardwood structure to utilize this hardwood structure to test terminal transmitting order to lower levels and test terminal with the center machine of distributed test system shown in Figure 3 be example to the process of center machine passback test data, illustrate how the present invention uses identical frame structure and realize the center machine of distributed test system and the communication between the test terminal, this concrete communication process may further comprise the steps as shown in Figure 4:
Step 1: the center machine of distributed test system utilizes this hardwood structure to the test terminal transmitting order to lower levels;
Distributed test system is when starting certain test process, at first pass through the parallel communication bus to the transmission order of parallel all test terminals that connect by center machine according to the test needs, this order has hardwood structure shown in Figure 6, the header that each test terminal detects the hardwood structure of this order then all begins to receive this order, and according to the frame length explanation of anchor-frame joint length in this hardwood structure, address and order length specification, the content of data length explanation and verification mode declaratives, calculate address in this hardwood structure, order, data, the frame joint length of check part, whether the order of judging center machine according to the address information in known self address and this hardwood structure of each test terminal sends to oneself then, if self address is identical with address in the hardwood structure, then send to oneself, the content of this hardwood structure residual part is continued to receive in this test terminal; If self address is different with address in the hardwood structure, then do not send to oneself, this test terminal stops to receive the content of this hardwood structure residual part, and the information from the header part that received of deletion;
Continue to receive the test terminal of this hardwood structure residual partial content according to the command component content aware test assignment of this hardwood structure that continues to receive, and obtain concrete test operation under this order (as to which port of opening the test terminal or to which parameter testing according to the data division content of this hardwood structure, test several inferior), according to the check part content of this hardwood structure the information of this hardwood structure is carried out verification then, if verification is correct, then after receiving the hardwood portion, namely begin test process; If check errors, then this test terminal is sent an information that retransmits order according to this hardwood structure to center machine, until can verification correct, finishes correct order and receives.
Step 2: the test terminal of distributed test system utilizes this hardwood structure to return test data to center machine;
After finishing test as requested, the test terminal of carrying out test command begins to center machine passback test data.Whether at first monitor after test is finished the test terminal of execution test command has other test terminal to carry out communication with center machine on the parallel communication bus, if have, then this test terminal is waited for until communication and being finished, and sends test data by the parallel communication bus to center machine; If no, then send test data by the parallel communication bus to center machine according to hardwood structure shown in Figure 6;
The header part that the center machine of distributed test system detects the hardwood structure of this test data then begins the acceptance test data, which test terminal judges this hardwood structure according to the address part content of this hardwood structure then is from, and is which kind of content measurement is center machine require to carry out to this test terminal test data according to the test data of this hardwood structure passback of the command component content aware of this hardwood structure;
Center machine is carried out verification according to the check part of this hardwood structure to the data of this hardwood structure then, if verification is correct, then behind hardwood caudal knot bundle, the data of this hardwood structure are stored or handled, if check errors, then center machine is sent an order that retransmits test data according to hardwood structure shown in Figure 6 to this test terminal, carry out the transmission again of data, correct until verification, finish correct test data and receive.
In the embodiment shown in fig. 4, the basic frame that communication is adopted saves structure as shown in Figure 5, and each frame joint adopts 1 bit start bit, 8 Bit data positions, no parity check position, 2 bit stop bits.The start bit code word is set at 1, and the stop bits code word is set at 0.
Fig. 6 is the schematic diagram of the frame structure that adopts in the embodiment shown in fig. 4 according to the present invention.Start working and be example with descending the 1780th test terminal the 98th port of instruction indication that send of center machine in certain communication among the embodiment shown in Figure 4, provided the length of the each several part that frame structure comprises in the communication, below provide the detailed coding of each several part:
1), frame head and postamble are set at respectively in this communication: 1_00101010_00 and 1_00100011_00.
2), the total length of a frame is 14 frames joints in this communication, so frame length partly is: 1_00001110_00.
3), preceding 6 bits of address and order length specification part are the address size explanation district that 2 system numerical tables show, back 2 bits are the order length specification district that 2 system numerical tables show.Address size is 2 frame joints in this communication, and order length is 1 frame joint, and location, old place and order length specification partly are: 1_000010_01_00.
4), data length is a frame joint in this communication, so data length partly is: 1_00000001_00.
5), preceding 4 bits of verification mode declaratives are information bit length specification district, back 4 bits are coded system explanation district.
Per 4 frames joint of verification mode adopts one group of CRC-16 verification in this communication.According to above given verification mode order, back 4 bits of check part are: 0011.One group of CRC-16 verification of per 32 bit information The data, namely per 4 frames joint adopts one group of CRC-16 verification, so preceding 4 bits of verification mode are 0100.So the verification mode declaratives are: 1_0100_0011_00.
6), adopt 2 grades of address structures realizations to the control of 10240 terminals in the test macro, adopt 128 to take advantage of 80 mode, namely have 128 A level addresses, include 80 B level addresses in each A level address, corresponding 1 test terminal, each B level address, 110 test ports are contained in each test terminal.The 1st frame joint content of corresponding address part can be 1_00000001_00 to 1_10000000_00; The 2nd frame joint content can be 1_00000001_00 to 1_01010000_00.
Address part is the 1780th terminal in this communication, represents that at 2 grades of address structures the 1st grade of address is that 23, the 2 grades of addresses are 20 under the mode.Therefore the 1st frame joint of address part is: 1_00010111_00.The 2nd frame joint is: 1_00010100_00.
7), the content of command component starts working for the indication port, according to command code given above, command component is: 1_00010010_00.
8), data division, content for the indication the 98th port, so be: 1_01100010_00.
9), the total length of frame length explanation in this communication, address and order length specification, data length explanation, verification mode explanation, address, order, data 7 parts is 8 frames joints, per 4 frames joint adopts one group of CRC-16 verification, so the length overall of check part is 32 bits, namely 4 frames save.The content that can get 4 people's frames joints of check part according to the generator polynomial of CRC-16 is followed successively by: 1_01011111_00,1_00111101_00,1_01000000_00,1_01011010_00.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. carry out the method for communication between the center machine of a distributed test system and the test terminal, it is characterized in that, comprising:
The center machine of distributed test system is to the test terminal transmitting order to lower levels; And
The test terminal of distributed test system returns test data to center machine;
Wherein, center machine adopts identical frame structure with the test terminal to center machine passback test data to the test terminal transmitting order to lower levels, and this identical frame structure comprises frame head, frame length explanation, address and order length specification, data length explanation, verification mode explanation, address, order, data, verification and postamble totally 10 parts.
2. carry out the method for communication between the center machine of distributed test system according to claim 1 and the test terminal, it is characterized in that, the frame joint length of described frame length explanation, address and order length specification, data length explanation and verification mode declaratives is fixed, and the frame joint of described address, order, data and check part is adjustable length.
3. carry out the method for communication between the center machine of distributed test system according to claim 2 and the test terminal, it is characterized in that,
The frame joint variable-length of described address part is used for realizing the multilevel address structure, meets the system extension mode of distributed test system;
The frame of described command component and data division joint variable-length is used for order being arranged different length with data in command transfer during with transfer of data;
The frame of described check part joint variable-length is used for adopting different check codes according to channel circumstance between different center machine and test terminal different.
4. carry out the method for communication between the center machine of distributed test system according to claim 1 and the test terminal, it is characterized in that, the basic composition unit of described frame structure is the frame joint, comprises start bit, data bit, check bit sum stop bits totally 4 parts.
5. carry out the method for communication between the center machine of distributed test system according to claim 4 and the test terminal, it is characterized in that,
Described start bit is used for sign start information when communication modes adopts asynchronous communication;
Described data bit is used for depositing the content that this frame structure each several part comprises;
Described check digit is used for each frame joint is carried out coding checkout;
Described stop bits is used for sign termination message when communication modes adopts asynchronous communication.
6. carry out the method for communication between the center machine of distributed test system according to claim 1 and the test terminal, it is characterized in that, the center machine of described distributed test system comprises to the test terminal transmitting order to lower levels:
Center machine sends order to parallel all test terminals that connect;
The header that each test terminal detects the hardwood structure of this order then all begins to receive this order, and according to the content of frame length explanation, address and order length specification, data length explanation and the verification mode declaratives of anchor-frame joint length in this hardwood structure, calculate the frame joint length of address, order, data, check part in this hardwood structure;
Each test terminal judges whether the order of center machine sends to oneself, if then the content of this hardwood structure residual part is continued to receive in this test terminal; If not, then this test terminal stops to receive the content of this hardwood structure residual part, and deletes the information from the header part that has received;
Continue to receive the test terminal of this hardwood structure residual partial content according to the command component content aware test assignment of this hardwood structure that continues to receive, and according to the data division content of this hardwood structure obtain this order under concrete test operation, according to the check part content of this hardwood structure the information of this hardwood structure is carried out verification then, if verification is correct, then after receiving the hardwood portion, namely begin test process; If check errors, then this test terminal is sent an information that retransmits order according to this hardwood structure to center machine, until can verification correct, finishes correct order and receives.
7. carry out the method for communication between the center machine of distributed test system according to claim 6 and the test terminal, it is characterized in that, described each test terminal judges that whether the order of center machine sends to oneself, comprising:
Whether the order that center machine is judged according to the address information in self address and the hardwood structure in each test terminal sends to oneself, if self address is identical with address in the hardwood structure, then sends to oneself; If self address is different with address in the hardwood structure, then do not send to oneself.
8. carry out the method for communication between the center machine of distributed test system according to claim 1 and the test terminal, it is characterized in that, the test terminal of described distributed test system returns test data to center machine, comprising:
After test is finished, whether there is other test terminal to carry out communication with center machine on the test terminal monitoring parallel communication bus, if having, then this test terminal is waited for until communication and being finished, and sends test data by the parallel communication bus to center machine; If no, then send test data by the parallel communication bus to center machine;
The header part that center machine detects the hardwood structure of this test data then begins the acceptance test data, which test terminal judges this hardwood structure according to the address part content of this hardwood structure then is from, and is which kind of content measurement is center machine require to carry out to this test terminal test data according to the test data of this hardwood structure passback of the command component content aware of this hardwood structure;
Center machine is carried out verification according to the check part of this hardwood structure to the data of this hardwood structure, if verification is correct, then behind hardwood caudal knot bundle, the data of this hardwood structure are stored or handled, if check errors, then center machine is sent an order that retransmits test data to this test terminal, carry out the transmission again of data, correct until verification, finish correct test data and receive.
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Application publication date: 20130703 |