CN103685545A - LAN (Local Area Network) based distributed LAN-PXI service system - Google Patents
LAN (Local Area Network) based distributed LAN-PXI service system Download PDFInfo
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Abstract
The invention discloses an LAN (Local Area Network) based distributed LAN-PXI service system. The LAN based distributed LAN-PXI service system comprises a computer, a PXI device and one or more switches, wherein the computer, the one or more switches and the PXI device are connected sequentially through a network cable and communicate through a VXI-11 protocol; the PXI device comprises a PXI control module and a PXI module; the working steps are that: step 1, the computer converts an input PXI VISA command to obtain a character string command which is designed by adopting an SCPI command standard; step 2, the computer sends the character string command to the PXI control module of the PXI device through each switch; step 3, the PXI control module of the PXI device resolves the character string command into a PXI-VISA command and calls a PXI VISA interface function library based on the PXI-VISA command to control the PXI module to carry out corresponding operations.
Description
Technical field
The invention belongs to field, virtual instrument technique field, relate in particular to a kind of distributed LAN-PXI service system based on LAN.
Background technology
Current PXI test macro generally consists of computer, PXI device two parts, wherein PXI device is again by PXI control module and PXI module composition, computer is connected with PXI control module by StarFabric bus, this connected mode generally only has the distance of 3-5 rice, is mainly used in centralized test.Raising along with system under test (SUT) complexity, there is distributed testing requirement in many test macros, testing requirements such as electrical network, geology, satellite naval vessel, these application all need to be tested in the even wider scope of hundreds of rice, and to test macro, integrated personnel have higher requirement.And prior art can not meet this demand.
Summary of the invention
For addressing the above problem, the present invention proposes a kind of distributed LAN-PXI service system based on LAN, this distributed LAN-PXI service system has broken through the bottleneck of existing PXI system on long distance, distributed testing, possesses the function of carrying out Long-distance Control and data communication.
Distributed LAN-PXI service system based on LAN of the present invention, this distributed LAN-PXI service system comprises: computer, PXI device, it is characterized in that, described distributed LAN-PXI service system also comprises: switch;
Described computer, switch, PXI device connect by netting twine successively, and communicate by VXI-11 agreement; Described switch is one or more; Described PXI device comprises: PXI control module and PXI module;
Its job step is:
Step 1, computer transforms the PXI VISA order of input, obtains character string command; Described character string command adopts the design of SCPI command standard;
Step 2, computer sends to described character string command by switch the PXI control module of PXI device;
Step 3, the PXI control module of PXI device resolves to PXI-VISA order by described character string command, and according to described PXI-VISA command calls PXI VISA interface, controls described PXI module and carry out corresponding operation;
Further, the analyzing step in described step 3 comprises:
Step 31 arranges a configuration file in described PXI control module, and in described configuration file, records function name and the parameter of all PXI-VISA interfaces;
Step 32, described PXI control module reads described function name, and forms the data structure of order and parameter, creates command tree;
Step 33, obtains the relevant information of order by traveling through described command tree;
In described step 3, the resource name of PXI module is named according to LAN bridge device naming method.
Further, in the job step of described distributed LAN-PXI service system:
If the PXI VISA order of input computer, with data, also needs to carry out data encoding, and coded data is sent to the PXI control module of PXI device by switch; Then described PXI control module is to the decoding data receiving; Last described PXI control module is controlled described PXI module according to the data call PXI VISA interface of PXI-VISA order and decoding and is carried out corresponding operation;
Further, in the job step of described distributed LAN-PXI service system:
If the PXI VISA order of input computer is retaking of a year or grade order, in described PXI module, carry out after corresponding operating, to the corresponding operating data encoding producing, be retaking of a year or grade data, and described retaking of a year or grade data are sent the data to computer by switch decode, for showing the operating state of PXI control module;
Above-mentioned coding rule is the data format of SCPI standard.
Further, in described step 3, according to the tree of SCPI order, adopt top-down analytic method to carry out command analysis.
Further, data encoding adopts following coded system:
The 1st byte is ' # ', represent that this communication, for data, makes a distinction with control command;
The figure place of the 2nd each data of byte representation, ' 0 ' represents 8 bit data, and ' 1 ' represents 16 bit data, and ' 2 ' represent 32 bit data, and ' 3 ' represent 64 bit data;
The length of 3rd～10 byte representation data, represents with the string as upper case of 16 systems, when not enough, mends 0;
Since the 11st byte, be data field, each data represents with the string as upper case of 16 systems, when not enough, mends 0.
Beneficial effect of the present invention is:
1. this distributed LAN-PXI service system has broken through the bottleneck of existing PXI system on long distance, distributed testing, possesses the function of carrying out Long-distance Control and data communication.
2. this distributed LAN-PXI service system can compatible existing virtual instrument framework, shields long-range PXI system module hardware characteristics, for terminal use's familiar method of operation of providing convenience, also for traditional PXI system provides new application prospect.
Accompanying drawing explanation
Fig. 1 is the distributed LAN-PXI service system schematic diagram based on LAN of the present invention;
Fig. 2 is the distributed LAN-PXI service system workflow diagram based on LAN of the present invention.
Embodiment
Fig. 1 is the distributed LAN-PXI service system schematic diagram based on LAN of the present invention.As shown in Figure 1, this distributed LAN-PXI service system comprises: computer, PXI device, it is characterized in that, and described distributed LAN-PXI service system also comprises: switch;
Described computer, switch, PXI device connect by netting twine successively, and communicate by VXI-11 agreement; Described switch is one or more; Described PXI device comprises: PXI control module and PXI module;
Its job step is:
Step 1, computer transforms the PXI VISA order of input, obtains character string command; Described character string command adopts the design of SCPI command standard;
Step 2, computer sends to described character string command by switch the PXI control module of PXI device;
Step 3, the PXI control module of PXI device resolves to PXI-VISA order by described character string command,
And according to described PXI-VISA command calls PXI VISA interface, control described PXI module and carry out corresponding operation;
Further, the analyzing step in described step 3 comprises:
Step 31 arranges a configuration file in described PXI control module, and in described configuration file, records function name and the parameter of all PXI-VISA interfaces;
Step 32, described PXI control module reads described function name, and forms the data structure of order and parameter, creates command tree;
Step 33, obtains the relevant information of order by traveling through described command tree;
In described step 3, the resource name of PXI module is named according to LAN bridge device naming method.
Further, in the job step of described distributed LAN-PXI service system:
If the PXI VISA order of input computer, with data, also needs to carry out data encoding, and coded data is sent to the PXI control module of PXI device by switch; Then described PXI control module is to the decoding data receiving; Last described PXI control module is controlled described PXI module according to the data call PXI VISA interface of PXI-VISA order and decoding and is carried out corresponding operation;
Further, in the job step of described distributed LAN-PXI service system:
If the PXI VISA order of input computer is retaking of a year or grade order, in described PXI module, carry out after corresponding operating, to the corresponding operating data encoding producing, be retaking of a year or grade data, and described retaking of a year or grade data are sent the data to computer by switch decode, for showing the operating state of PXI control module;
Above-mentioned coding rule is the data format of SCPI standard.
Further, in described step 3, according to the tree of SCPI order, adopt top-down analytic method to carry out command analysis.
(1) traditional PXI system is regarded PXI equipment the peripheral hardware of computer, and VISA storehouse is driven and controlled by PXI bus apparatus; And in the constructed device of the present invention, between two terminals that connect by netting twine (computer, PXI device), in signal transmission, be peer-to-peer, computer can not directly be accessed the PXI module resource in PXI device, needs PXI module forwards.
Fig. 2 is the distributed LAN-PXI service system workflow diagram based on LAN of the present invention.As shown in Figure 2, comprise two parts of service of moving in the service that moves on computer and PXI module.The present invention provides an interface that meets VISA standard to user in computer; When concrete VISA realizes, action name and parameter change into command messages, by LAN, are communicated by letter and are sent to PXI control module and carry out; When PXI VISA order is during with data, data are according to PXI instrument system data characteristics coding, by between network and PXI control module, communicate by letter.
PXI control module receives character string command, fill order is resolved, parse the parameters such as control command that the PXI module that will control and the PXI module that will control will carry out, address, data, simultaneously, the data that will send or receive are carried out to coding/decoding work, then control PXI module execution respective operations by calling traditional PXI VISA interface.
(2) resource name of PXI module in LAN-PXI system, considers compatibility, according to the general rule of LAN bridge device name, name, and design in the following ways, for example: " TCPIP0::169.254.22.25::pxi3,5::INSTR ", wherein,
TCPIP0 represents that PXI module adopts TCPIP mode to conduct interviews;
169.254.22.25 field is partly the IP address of PXI control module, according to actual conditions, fills in;
Pxi3,5 is the resource description of PXI module in PXI device, and wherein 3 is segment number, and 5 is groove number, according to actual conditions, fills in;
INSTR represents to meet instrument feature, and receive interruption signal is processed.
(3) method that order transforms, adopts the naming method design of SCPI, for example:
The character string command that function viOut32 (1,11,14,1) is corresponding is " VIOut321,11,14,1 ";
The character string command that function viIn32 (1,11,14, & n) is corresponding is " VIIn321,11,14 ".
(4) method of data encoding, considers the data mode of instrument communication, and the data format design with reference to SCPI standard, adopts following coded system:
The 1st byte is ' # ', represent that this communication, for data, makes a distinction with control command;
The figure place of the 2nd each data of byte representation, ' 0 ' represents 8 bit data, and ' 1 ' represents 16 bit data, and ' 2 ' represent 32 bit data, and ' 3 ' represent 64 bit data;
The length of 3rd～10 byte representation data, represents with the string as upper case of 16 systems, when not enough, mends 0, for example " 0000FFFF " represent 64K data;
Since the 11st byte, it is data field, each data represents with the string as upper case of 16 systems, when not enough, mend 0, for example the 0xF of 8 bit data is expressed as " 0F ", the 0xF of 16 bit data is expressed as " 000F ", the 0xF of 32 bit data is expressed as " 0000000F ", and the 0xF of 64 bit data is expressed as " 000000000000000F ".
(5) controlling between computer and PXI module, with reference to LXI bus protocol, use VXI-11 agreement to communicate, can be reliable and stable carry out instrument discovery, identification, control and communicate by letter.
(6), during command analysis, according to the tree of SCPI order, adopt top-down analytic method.
A configuration file is set in PXI control module, in configuration file, records all VISA built-in function titles.The command analysis moving in PXI control module forms VISA built-in function command set the data structure of order and parameter, and creates the command tree for inquiry; While resolving message, according to the order obtaining, by traversal command tree, obtain the relevant information of order.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (5)
1. the distributed LAN-PXI service system based on LAN, this distributed LAN-PXI service unit comprises: computer, PXI device, it is characterized in that, described distributed LAN-PXI service system also comprises: switch;
Described computer, switch, PXI device connect by netting twine successively, and communicate by VXI-11 agreement;
Described switch is one or more;
Described PXI device comprises: PXI control module and PXI module;
Its job step is:
Step 1, computer transforms the PXI VISA order of input, obtains character string command; Described character string command adopts the design of SCPI command standard;
Step 2, computer sends to described character string command by switch the PXI control module of PXI device;
Step 3, the PXI control module of PXI device resolves to PXI-VISA order by described character string command, and according to described PXI-VISA command calls PXI VISA interface, controls described PXI module and carry out corresponding operation;
Further, the analyzing step in described step 3 comprises:
Step 31 arranges a configuration file in described PXI control module, and in described configuration file, records function name and the parameter of all PXI-VISA interfaces;
Step 32, described PXI control module reads described function name, and forms the data structure of order and parameter, creates command tree;
Step 33, obtains the relevant information of order by traveling through described command tree;
In described step 3, the resource name of PXI module is named according to LAN bridge device naming method.
2. the distributed LAN-PXI service system based on LAN as claimed in claim 1, is characterized in that, in the job step of described distributed LAN-PXI service system:
If the PXI VISA order of input computer, with data, also needs to carry out data encoding, and coded data is sent to the PXI control module of PXI device by switch; Then described PXI control module is to the decoding data receiving; Last described PXI control module is controlled described PXI module according to the data call PXI VISA interface of PXI-VISA order and decoding and is carried out corresponding operation.
3. the distributed LAN-PXI service system based on LAN as claimed in claim 1, is characterized in that, in the job step of described distributed LAN-PXI service system:
If the PXI VISA order of input computer is retaking of a year or grade order, in described PXI module, carry out after corresponding operating, to the corresponding operating data encoding producing, be retaking of a year or grade data, and described retaking of a year or grade data are sent the data to computer by switch decode, for showing the operating state of PXI control module;
Above-mentioned coding rule is the data format of SCPI standard.
4. the distributed LAN-PXI service system based on LAN as claimed in claim 1, is characterized in that,
In described step 3, according to the tree of SCPI order, adopt top-down analytic method to carry out command analysis.
5. the distributed LAN-PXI service system based on LAN as claimed in claim 1, is characterized in that, data encoding adopts following coded system:
The 1st byte is ' # ', represent that this communication, for data, makes a distinction with control command;
The figure place of the 2nd each data of byte representation, ' 0 ' represents 8 bit data, and ' 1 ' represents 16 bit data, and ' 2 ' represent 32 bit data, and ' 3 ' represent 64 bit data;
The length of 3rd～10 byte representation data, represents with the string as upper case of 16 systems, when not enough, mends 0;
Since the 11st byte, be data field, each data represents with the string as upper case of 16 systems, when not enough, mends 0.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107733520A (en) * | 2017-10-17 | 2018-02-23 | 北京空间技术研制试验中心 | Satellite ground S-band signal repeater |
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