WO2013097221A1

WO2013097221A1 - Method for communication between centre machine and test terminal in distributed test system

Info

Publication number: WO2013097221A1
Application number: PCT/CN2011/085142
Authority: WO
Inventors: 孟真; 阎跃鹏; 于进勇
Original assignee: 中国科学院微电子研究所
Priority date: 2011-12-31
Filing date: 2011-12-31
Publication date: 2013-07-04

Abstract

Disclosed is a method for communication between a centre machine and a test terminal in a distributed test system, including: a centre machine of a distributed test system issuing a command to a test terminal; the test terminal of the distributed test system transferring test data back to the centre machine; and the centre machine issuing a command to the test terminal and the test terminal transferring test data back to the centre machine employing the same frame structure. The same frame structure includes 10 parts of a frame head, frame length description, address and command length description, data length description, check method description, address, command, data, check and frame end. The frame byte lengths of the frame length description, address and command length description, data length description and check method description are fixed, and the frame byte lengths of the address, command, data and check parts are variable. The present invention can be applied to effectively simplify the replacement process of communication software in a distributed test system when the functions of a device change, which facilitates the flexible extension of the distributed test system.

Description

TECHNICAL FIELD The present invention relates to the field of control and data transmission technologies of a distributed test system, and more particularly, to a method between a central machine and a test terminal of a distributed test system. The method of communication is applicable to distributed test systems with a large number of test terminals.

BACKGROUND OF THE INVENTION Distributed test systems containing a large number of test terminals have a wide range of applications in industrial production. In the test process, the distributed test system needs to dynamically control the test terminal according to the change of the measurement result of the test object, and implement the test plan flexibly, so it has the characteristics of physical distribution, concurrent access, and timing sensitivity.

Distributed testing requires high process control for the test process and requires real-time access to the global state to guide the test process. Therefore, the distributed test system is suitable for a centralized control system. The equipment in the system is divided into two types according to functions: central control unit and test terminal. The central unit is the system control and data processing core. It is used to collect and analyze the test results of each terminal, and issue corresponding control commands according to the test results to control the entire test. The operation of the system; the test terminal is responsible for performing parameter testing and returning test data according to the commands of the central machine.

The distributed test system has flexible scalability according to the test environment and the change of the test scale. Therefore, the function of a certain device in the system is not constant, but is flexible according to the change of the system. Set.

In the existing distributed test system, the control command of the downlink communication from the central machine to the test terminal transmits the data transmission of the uplink communication from the test terminal to the central machine, and a separate and different communication protocol is adopted. In the communication mode, since the manner in which the central machine and the test terminal are transmitted and received is different, the communication software of the device needs to be replaced when the function of the device changes in the system, and the replacement process is for a large-scale distributed The test system is very cumbersome and complicated. SUMMARY OF THE INVENTION In view of this, the main object of the present invention is to provide a method for communication between a central machine and a test terminal of a distributed test system, so as to simplify the process of replacing the communication software when the device function is changed in the distributed test system, which is convenient. Flexible expansion of distributed test systems.

To achieve the above object, the present invention provides a method for communicating between a central machine and a test terminal of a distributed test system, including: a central machine of the distributed test system issues a command to the test terminal; and a distributed test system The test terminal returns test data to the central machine; wherein, the central machine sends a command to the test terminal and the test terminal returns the test data to the central machine using the same frame structure, and the same frame structure includes a frame header, a frame length description, and an address. And command length description, data length description, verification method description, address, command, data, checksum, and frame end.

In the above solution, the frame length description, the address and command length description, the data length description, and the check mode description part of the frame length are fixed, and the address, the command, the data, and the check portion have a variable frame length. of. The basic constituent unit of the frame structure is a frame section, which includes four parts: a start bit, a data bit, a parity bit, and an end bit.

In the above solution, the central machine of the distributed test system sends a command to the test terminal, including: the central machine sends a command to all test terminals connected in parallel; the test device detects that the 桢 structure of the command starts. Receiving the command, and calculating the address, command, data, and school in the structure according to the frame length description, the address and command length description, the data length description, and the verification mode description part of the fixed frame length in the frame structure The length of the frame section of the verification part; each test terminal judges whether the command of the central machine is sent to itself, and if so, the test terminal continues to receive the content of the remaining part of the structure; if not, the test terminal stops receiving the message The content of the remaining part of the structure, and deleting the information of the received self-scratch part; the test terminal continuing to receive the remaining part of the structure obtains the test task according to the content of the command part of the structure that is continuously received, and according to the structure of the structure The data part of the content gets the specific test operation under this command, and then according to the 桢The content of the verification part of the structure is verified by the information of the structure. If the verification is correct, the test process is started after the end of the tail is received; if the verification is wrong, the test terminal follows the structure to the center. Issue a message to retransmit the command until it can be verified correctly and complete the correct command reception. In the above solution, the test terminal of the distributed test system returns the test data to the central machine, including: after the test is completed, the test terminal monitors whether there are other test terminals on the parallel communication bus communicating with the central machine, if any, Then the test terminal waits until the communication ends, and sends test data to the central machine through the parallel communication bus; if not, sends the test data to the central machine through the parallel communication bus; the central machine detects the header portion of the test structure Then, the test data is received, and then according to the content of the address part of the structure, it is determined from which test terminal the structure is from, and according to the content of the command part of the structure, the test data returned by the structure is the central machine. The test data of the test content required by the terminal; the central machine verifies the data of the structure according to the check portion of the structure, and if the verification is correct, the data of the structure is stored after the end of the file Or processing, if the verification is wrong, the center machine goes to the test terminal A test data retransmission commands, re-transmission of data until the check is correct, the received test data done correctly.

As can be seen from the above technical solutions, the present invention has the following beneficial effects:

1. The method for communication between a central machine and a test terminal of the distributed test system provided by the present invention, the control command and the data transmission are collected in the same frame structure, and the same can be used in the two-way communication between the central machine and the test terminal. The frame structure effectively simplifies the process of replacing the communication software when the device function changes in the distributed test system, which facilitates the flexible expansion of the distributed test system.

2. The method for communication between the central machine and the test terminal of the distributed test system provided by the present invention, the basic unit of the frame structure is a frame section, and the frame section can set the start bit and the end bit to perform different communication, which is convenient. The distributed test system uses different communication methods such as peer communication and different communication.

3. The method for communicating between a central machine and a test terminal of the distributed test system provided by the present invention has a multi-level address structure for multi-level address addressing of a large number of terminals included in the system, and has a large capacity.

4. The method for communication between the central machine and the test terminal of the distributed test system provided by the present invention has a flexible and configurable code verification mode, and different verification modes can be adopted according to different test environments and test terminals. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a frame structure used when communication between a central machine and a test terminal of a distributed test system provided by the present invention; FIG.

2 is a schematic diagram of a basic constituent unit frame section of the frame structure shown in FIG. 1;

3 is a schematic diagram of a distributed test system having a multi-level address structure in accordance with an embodiment of the present invention;

4 is a flow chart of a method for communicating between a central machine and a test terminal of a distributed test system according to an embodiment of the present invention;

Figure 5 is a schematic diagram of a basic constituent unit frame section of a frame structure employed in the embodiment shown in Figure 4;

Figure 6 is a schematic illustration of the frame structure employed in the embodiment of Figure 4.

DETAILED DESCRIPTION OF THE INVENTION In order to make the objects, the technical solutions and the advantages of the present invention more comprehensible, the present invention will be described in detail below with reference to the accompanying drawings.

The method for communicating between the central machine and the test terminal of the distributed test system provided by the present invention, the central machine of the distributed test system sends a command to the test terminal, and the test terminal transmits the test data to the central machine, and the two communication processes are adopted. The same frame structure. As shown in FIG. 1, FIG. 1 is a schematic diagram of a frame structure used when communication between a central machine and a test terminal of the distributed test system provided by the present invention. The frame structure includes a frame header, a frame length description, an address and command length description, a data length description, a verification mode description, an address, a command, a data, a checksum, and a frame end. The frame length description, the address, and the command are included. The length of the frame section of the length description, the data length description, and the verification mode description is fixed, and the length of the frame section of the address, command, data, and checksum is variable. The length of the frame section of the address part is variable, and the multi-level address structure can be realized, which conforms to the system expansion mode of the distributed test system; the length of the frame section of the command part and the data part is variable, and the command and data can be commanded during command transmission and data transmission. Set different lengths; the length of the frame section of the check part is variable, and different check codes can be used according to different channel environments between different central machines and test terminals. The basic component of the above frame structure is a frame section, and its structure is as shown in FIG. 2, which can be applied to both peer-to-peer communication and heterogeneous communication. The frame section includes a start bit, a data bit, a check bit and an end bit, wherein the start bit is used to mark the start information when the communication mode adopts the different communication, and the data bit is used to store the part included in the frame structure. The content of the check digit is used to encode and verify each frame section, and the end bit is used to mark the termination information when the communication mode uses heterogeneous communication.

An example of the application of a frame structure is given in the present invention, and this frame structure is applied to a distributed test system having a multi-level address structure as shown in FIG. This distributed test system uses a central machine to control the operation of the entire system. The central unit is connected in parallel with each test terminal through the parallel communication bus to realize the terminal distribution pattern with the same priority.

The distributed test system shown in Figure 3 uses A and B total two-level address structure, in which the A-level address structure contains 128 addresses, and the B-level address structure contains 80 addresses. This 2-level address structure can be used for 10240 test terminals. Real-time control and test data backhaul. The distributed test system shown in Figure 3 contains 110 test ports per test terminal. Table 1 shows some of the commands and corresponding functions of the test system. Table 2 shows some of the calibration methods and their codes in the 桢 structure.

Command name

0001 CRC-4 (generating polynomial: x4+x+l)

0010 CRC-12 (generating polynomial: xl2+xl l+x3+x+l )

0011 CRC-16 (generating polynomial: xl6+xl5+x2+l)

0100 CRC-32 (generating polynomial: x32+x26+x23+...+x2+x+l )

Table 2: Calibration methods and corresponding code examples in distributed test systems In the following, the central machine of the distributed test system shown in FIG. 3 uses the 桢 structure to send commands to the test terminal and the test terminal uses the 桢 structure to return test data to the central machine as an example to illustrate how the present invention applies the same frame. The structure realizes the communication between the central machine and the test terminal of the distributed test system. The specific communication process is shown in FIG. 4, and includes the following steps: Step 1: The central machine of the distributed test system uses the structure to the test terminal When a test process is started, the central machine first sends a command to all test terminals connected in parallel through the parallel communication bus according to the test requirements. The command has the structure shown in FIG. 6, and each test terminal The header of the 桢 structure that detects the command starts to receive the command, and according to the frame length description, the address and command length description, the data length description and the verification mode description part of the fixed frame section length in the 桢 structure, Calculate the frame length of the address, command, data, and check portion of the structure, and then test the root of each test terminal. The known self address and the address information in the structure determine whether the command of the central machine is sent to itself. If the address of the own machine is the same as the address in the structure, it is sent to itself, and the test terminal continues to receive the command. The content of the rest of the structure; if the address of the self is different from the address in the structure, it is not sent to itself, the test terminal stops receiving the content of the remaining part of the structure, and deletes the information of the received self-head part;

The test terminal that continues to receive the remaining part of the structure obtains the test task according to the content of the command part of the structure that is continuously received, and obtains a specific test operation under the command according to the data part of the structure (for example, opening the test terminal) The first port or the first parameter is tested, tested several times, etc., and then the information of the structure is verified according to the content of the check part of the structure. If the verification is correct, the tail is received. After the part, the test process starts; if the check is wrong, the test terminal sends a retransmission command information to the center machine according to the structure until the correct command is completed and the correct command reception is completed.

Step 2: The test terminal of the distributed test system uses the 桢 structure to return the test data to the central machine;

After the test is completed according to the requirements, the test terminal that executes the test command starts to return the test data to the center machine. The test terminal that executes the test command first monitors whether there are other test terminals on the parallel communication bus that are communicating with the central machine after the test is completed. If there is, the test is performed. The terminal waits until the communication ends, and sends test data to the central machine through the parallel communication bus; if not, sends the test data to the central machine through the parallel communication bus according to the 桢 structure shown in FIG. 6;

The central part of the distributed test system detects that the header part of the test data begins to receive the test data, and then determines which test terminal the structure is from, based on the content of the address part of the structure, and according to the structure The content of the command part is informed that the test data returned by the structure is the test data of the test content requested by the central machine for the test terminal;

Then, the central machine checks the data of the structure according to the check portion of the structure. If the verification is correct, the data of the structure is stored or processed after the end of the file. If the verification is wrong, the center is The machine sends a command to retransmit the test data to the test terminal according to the 桢 structure shown in FIG. 6, and retransmits the data until the verification is correct, and the correct test data reception is completed.

In the embodiment shown in Fig. 4, the basic frame structure used for communication is as shown in Fig. 5. Each frame section adopts 1 bit start bit, 8 bit data bits, no parity bit, and 2 bit end bit. The start bit code word is set to 1, and the end bit code word is set to 0.

Figure 6 is a schematic illustration of the frame structure employed in the embodiment of Figure 4 in accordance with the present invention. In the communication in the embodiment shown in FIG. 4, the downlink command of the central machine indicates that the 98th port of the 1780th test terminal starts to work, and the length of each part included in the frame structure in the communication is given. Detailed coding of each part:

1), the frame header and the end of the frame are set to: 1-00101010—00 and 1-00100011—00 respectively in this communication.

2) The total length of one frame in this communication is 14 frame segments, so the frame length is: 1-00001110-00.

3) The first 6 bits of the address and command length description are the address length description area indicated by the binary number, and the last 2 bits are the command length description area indicated by the binary number. In this communication, the address length is 2 frame segments, and the command length is 1 frame segment. Therefore, the description of the address and command length is: 1-000010—01—00.

4), the data length in this communication is one frame section, so the data length part is: 1-00000001—00.

5) The first 4 bits of the verification mode description part are the information bit length description area, and the last 4 bits are the coding mode description area.

The verification method in this communication uses a set of CRC-16 checksums every 4 frame sections. According to the check mode command given above, the last 4 bits of the checksum are: 0011. A 32-bit CRC-16 check is used for each 32-bit information data, that is, a set of CRC-16 checksums is used for every 4 frame segments, so the first 4 bits of the check mode are 0100. Therefore, the description of the verification method is: 1—0100 —0011—00.

6), the test system uses a 2-level address structure to control 10240 terminals, using 128 by 80, that is, there are 128 A-level addresses, each of which contains

80 B-level addresses, each B-level address corresponds to one test terminal, and each test terminal contains 110 test ports. The content of the first frame of the corresponding address part can be: 1 00000001 00 to 1—10000000—00; the content of the second frame section can be: 1 00000001 00 to 1—01010000—00.

In this communication, the address part is the 1780th terminal, and in the level 2 address structure representation mode, the first level address is 23, and the second level address is 20. Therefore, the first frame section of the address part is: 1-00010111_00. The second frame section is: 1-00010100—00.

7), the content of the command part is to indicate that the port starts to work. According to the command code given above, the command part is: 1-00010010—00.

8), the data part, the content is the port of indication 98, so: 1—01100010—00.

9), the frame length description, address and command length description, data length description, verification mode description, address, command, data, total length of 7 parts of this communication is 8 frame sections, and a set of CRC is used every 4 frame sections. -16 Check, so the total length of the check part is 32 bits, that is, 4 frame sections. According to the generator polynomial of CRC-16, the contents of the 4-person frame section of the check portion are: 1-01011111-00, 1-0011110-100, 1-01000000-00, 1-01011010-00.

The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Rights request

A method for communicating between a central machine and a test terminal of a distributed test system, comprising:

The central machine of the distributed test system issues a command to the test terminal;

The test terminal of the distributed test system returns the test data to the central machine;

The central machine sends the command to the test terminal and the test terminal returns the test data to the central machine using the same frame structure. The same frame structure includes the frame header, the frame length description, the address and command length description, the data length description, and the calibration. There are 10 parts in the description of the method, address, command, data, checksum and frame end.

2. The method for communicating between a central machine and a test terminal of a distributed test system according to claim 1, wherein the frame length description, the address and command length description, the data length description, and the verification mode description The length of the portion of the frame is fixed, and the length of the frame of the address, the command, the data, and the check portion is variable.

3. The method of communicating between a central machine and a test terminal of the distributed test system according to claim 2, wherein:

The frame portion of the address portion has a variable length, and is used to implement a multi-level address structure, and conforms to a system expansion mode of the distributed test system;

The command portion and the data portion have variable frame lengths for setting different lengths of commands and data during command transmission and data transmission;

The frame length of the check portion is variable, and is used to adopt different check codes according to different channel environments between different central machines and test terminals.

The method for communicating between a central machine and a test terminal of the distributed test system according to claim 1, wherein the basic component of the frame structure is a frame section, including a start bit, a data bit, The check digit and the end bit have a total of 4 parts.

5. The method of communicating between a central machine and a test terminal of a distributed test system according to claim 4, wherein:

The start bit is used to mark start information when the communication mode adopts different communication; the data bit is used to store content included in each part of the frame structure; The check bit is used to perform coding verification on each frame section;

The end bit is used to mark the termination information when the communication mode uses heterogeneous communication.

The method of communicating between the central unit and the test terminal of the distributed test system according to claim 1, wherein the central machine of the distributed test system sends a command to the test terminal, including:

The central machine sends commands to all test terminals connected in parallel;

Each test terminal detects that the command structure of the command starts receiving the command, and according to the frame length description of the fixed frame length in the frame structure, the address and command length description, the data length description, and the verification mode description part. Content, calculate the frame length of the address, command, data, and check portion of the structure;

Each test terminal determines whether the command of the central machine is sent to itself, and if so, the test terminal continues to receive the content of the remaining portion of the structure; if not, the test terminal stops receiving the content of the remaining portion of the structure, and Deleting the received information from the header portion; the test terminal continuing to receive the remaining portion of the structure obtains the test task according to the content of the command portion of the structure that continues to be received, and obtains the command according to the data portion of the structure The specific test operation is performed, and then the information of the structure is verified according to the content of the check portion of the structure. If the check is correct, the test process is started after the end of the tail is received; if the check is incorrect, The test terminal sends a retransmission command information to the center machine according to the 桢 structure until the correct command is completed, and the correct command reception is completed.

The method for communicating between the central unit and the test terminal of the distributed test system according to claim 6, wherein the test terminals determine whether the command of the central machine is sent to itself, including:

Each test terminal determines whether the command of the central machine is sent to itself according to the address information in the own address and the 桢 structure, and if the address is the same as the address in the 桢 structure, it is sent to itself; if the own address and the 桢 structure If the address is different, it is not sent to yourself.

The method of communicating between the central unit and the test terminal of the distributed test system according to claim 1, wherein the test terminal of the distributed test system returns test data to the center machine, including:

After the test is completed, the test terminal monitors whether there are other test terminals on the parallel communication bus. Communicating with the central machine, if there is, the test terminal waits until the communication ends, and sends test data to the central machine through the parallel communication bus; if not, sends the test data to the central machine through the parallel communication bus;

The gimmick portion of the 桢 structure of the test data of the test machine starts to receive the test data, and then determines which test terminal the 桢 structure is from according to the content of the address portion of the 桢 structure, and knows according to the content of the command part of the 桢 structure The test data returned by the structure is the test data of the test content required by the central machine for the test terminal;

The central machine checks the data of the structure according to the check portion of the structure. If the verification is correct, the data of the structure is stored or processed after the end of the file. If the verification is wrong, the center machine A command to retransmit the test data is sent to the test terminal, and the data is retransmitted until the verification is correct, and the correct test data reception is completed.