CN107219843A - The fault-signal analogue means of MIL STD 1553B bus nodes based on arbitrary-function generator - Google Patents
The fault-signal analogue means of MIL STD 1553B bus nodes based on arbitrary-function generator Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0256—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults injecting test signals and analyzing monitored process response, e.g. injecting the test signal while interrupting the normal operation of the monitored system; superimposing the test signal onto a control signal during normal operation of the monitored system
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Abstract
The fault-signal analogue means of MIL STD 1553B bus nodes based on arbitrary-function generator, is related to the fault test field of MIL STD 1553B bus systems.The problem of present invention is to solve using the fault-signal of special MIL STD 1553B customization output data generation needs so as to more comprehensively test whole bus system, poor universality.Failure add module inputs MIL STD 1553B protocol groups words, and fault-signal is added in this group of word, and this group of word generates data point；Arbitrary-function generator exports MIL STD 1553B signal waveforms according to data point and gives MIL STD 1553B level adapters；Signal is changed into level standard to MIL STD 1553B buses transmission message by MIL STD 1553B level adapters.It is used for the fault-signal of emulation bus node.
Description
Technical field
The present invention relates to a kind of failure simulation device, and in particular to the MIL-STD-1553B based on arbitrary-function generator
Bus failure signal imitation.Belong to the fault test field of MIL-STD-1553B bus systems.
Background technology
MIL-STD-1553B bus systems are widely used in aerospace field, because in such a case, it is steady to system
It is qualitative to have higher requirement, so, it is necessary to each node in bus before the establishment of MIL-STD-1553B bus systems,
Comprehensively tested including bus control unit (BC) and each remote terminal (RT), observe it in different bus data transfer shapes
Under state, correct communication can be ensured.Also, in the event of bus failure, whether each node of bus is able to carry out correctly
Error handling mechanism.
In test process is carried out to it, if using special MIL-STD-1553B node apparatus, when dispatching from the factory, phase
Producer is answered necessarily to carry out comprehensive test to these node apparatus.So setting up total linear system using these node apparatus
, often can only situation of the test node in normal work, it is impossible to situation of the test node in abnormal work during system, even if
Thousands of times work interior joint occurs in that failure, and this failure is also probably very much random greatly, it is impossible to failure customization is carried out, so always
Desired this failure of reproduction of line system testers is also very difficult.And filled if tested using special MIL-STD-1553B
Put, although output data can be customized and produce the fault-signal needed so as to more comprehensively test whole bus system, but so
Test device cost it is high, versatility is not strong.For general system testers, a not selection well.
The content of the invention
The present invention is to produce the fault-signal needed to solve to use special MIL-STD-1553B to customize output data
So as to the problem of more comprehensively testing whole bus system, poor universality.MIL- based on arbitrary-function generator is now provided
The fault-signal analogue means of STD-1553B bus nodes.
The fault-signal analogue means of MIL-STD-1553B bus nodes based on arbitrary-function generator, it includes appointing
Meaning function generator, failure add module and MIL-STD-1553B level adapters,
Failure add module, for inputting MIL-STD-1553B protocol groups words, in MIL-STD-1553B protocol groups words
Add fault-signal, protocol groups word generation data point；
It is described addition fault-signal detailed process be：
The communication information in bus is write with the coding line of 20, the status word of 20 and the data word of 20, according to event
Barrier demand, one or more kinds of mistakes are added in coding line, status word and data word, MIL-STD-1553B bus sections are constituted
The fault-signal of point；
The mode that mistake is added in coding line is included in synchronous head addition mistake, adds Manchester in parity check bit
Code error, remote terminal address add Manchester's code mistake and instruction segment add Manchester's code mistake,
The mode that mistake is added in status word is included in synchronous head addition mistake, adds Manchester in parity check bit
Code error, remote terminal address add Manchester's code mistake and state section addition Manchester's code mistake,
The mode for adding mistake in data words is included in synchronous head addition mistake, adds Manchester in parity check bit
Code error and data segment add Manchester's code mistake,
Arbitrary-function generator, for exporting MIL-STD-1553B signal waveforms according to the data point of generation, by the waveform
It is sent to MIL-STD-1553B level adapters；
MIL-STD-1553B level adapters, meet MIL- for the output signal of arbitrary-function generator to be changed into
Level standard as defined in STD-1553B agreements, message is sent to MIL-STD-1553B buses.
Preferably, when MIL-STD-1553B level adapters are communicated with remote terminal, fault-signal analogue means
As a bus control unit, coding line is sent to remote terminal, so as to simulate bus in MIL-STD-1553B bus communications
Controller sends message to remote terminal；Transmission/received bit in instruction segment determines transmission/reception instruction, if transmission/reception
What position was sent is to send instruction, and arbitrary-function generator exports the coding line pre-seted using data point to remote terminal；Such as
What fruit transmission/received bit was sent is to receive instruction, and fault-signal analogue means is received immediately receive after coding line in instruction and advised
Fixed number purpose data word；
When MIL-STD-1553B level adapters are communicated with bus control unit, fault-signal analogue means conduct
One remote terminal, bus control unit sends coding line to remote terminal, and MIL-STD-1553B level adapters are used to detect
The rising edge of coding line is sent in MIL-STD-1553B buses, triggering is provided to the external trigger input of arbitrary-function generator
Signal so that arbitrary-function generator exports the status word and data word pre-seted using data point, so as to simulate MIL-
The message that STD-1553B bus communications remote terminal is exported to bus control unit.
Preferably, MIL-STD-1553B level adapters include MIL-STD-1553B protocol transceivers and delay circuit,
MIL-STD-1553B protocol transceivers, meet MIL- for the output signal of arbitrary-function generator to be changed into
Level standard as defined in STD-1553B agreements, message is sent to MIL-STD-1553B buses；
Delay circuit, in cycle for ensureing to export the status word that presets and data word in arbitrary-function generator,
Valid data edge should not be received again, it is to avoid produce the bus response of mistake.
Beneficial effects of the present invention are：
The application is based on arbitrary-function generator, coordinates the special level adapters of MIL-STD-1553B and failure addition
Module, simulated failure signal and simulate to MIL-STD-1553B buses send message.
First, MIL-STD-1553B bus datas are more flexibly customized by controlling arbitrary-function generator to realize,
Customization precision can reach each of each bus word.Tester can be straight in the software interface of failure add module
Customization MIL-STD-1553B bus word contents are seen, to carry out correct data transfer, several wrong bus can also be exported
Word, with emulation bus failure.In addition, the special level adapters of MIL-STD-1553B that the invention includes, make use of arbitrary function
The external trigger function of generator, can simulate the full message response process of mono- bus node of MIL-STD-1553B.So
Tester can test another bus control unit or remote using the device as a specific bus controller or remote terminal
Response of the journey terminal when finding bus failure signal.The application versatility compared with existing bus system improves more than 5 times.
The advantage of the application：
1. device is built simply, cost is low, and instrumentation needs only to the conventional arbitrary function hair of an electronic leaning laboratory
Raw device.
2. the flexibility ratio of test is high, allocative abilities are can customize by force, either for word content or its event included
Barrier, host computer can realize that a MIL-STD-1553B message amounts to the setting of any position of any word in 33 words.
3. realizing responsive operation of the arbitrary-function generator to bus signals using the method for low cost, make unit simulation
Protocol node is more true and reliable.
Brief description of the drawings
Fig. 1 is the MIL-STD-1553B bus nodes based on arbitrary-function generator described in embodiment one
The fault-signal addition flow chart of fault-signal analogue means；
Fig. 2 is the MIL-STD-1553B bus nodes based on arbitrary-function generator described in embodiment one
The principle schematic of fault-signal analogue means；
Fig. 3 is the principle schematic of MIL-STD-1553B level adapters；
Fig. 4 is 1553B bus topolopy figures；
Fig. 5 is data encoding format oscillogram；
Fig. 6 is word format；
Fig. 7 is instruction word format；
Fig. 8 is data word format；
Fig. 9 is state word format；
Figure 10 is transmission word format of the controller to remote terminal；
Figure 11 is transmission word format of the remote terminal to controller；
Figure 12 is transmission word format of the remote terminal to remote terminal；
Modes of the Figure 13 for transmission without data word is instructed；
Figure 14 is instructed (transmission) for the mode of transmission belt data word；
Figure 15 is instructed (reception) for the mode of transmission belt data word；
Figure 16 is that controller transmits word format to the broadcast of each remote terminal；
Figure 17 is remote terminal to each remote terminal transmission word format；
Figure 18 instructs for the mode without data word；
Figure 19 is that the mode with data word is instructed.
Embodiment
The fault-signal analogue means of MIL-STD-1553B bus nodes based on arbitrary-function generator, it includes appointing
Meaning function generator, failure add module and MIL-STD-1553B level adapters,
Failure add module, for inputting MIL-STD-1553B protocol groups words, in MIL-STD-1553B protocol groups words
Add fault-signal, protocol groups word generation data point；
It is described addition fault-signal detailed process be：
The communication information in bus is write with the coding line of 20, the status word of 20 and the data word of 20, according to event
Barrier demand, one or more kinds of mistakes are added in coding line, status word and data word, MIL-STD-1553B bus sections are constituted
The fault-signal of point；
The mode that mistake is added in coding line is included in synchronous head addition mistake, adds Manchester in parity check bit
Code error, remote terminal address add Manchester's code mistake and instruction segment add Manchester's code mistake,
The mode that mistake is added in status word is included in synchronous head addition mistake, adds Manchester in parity check bit
Code error, remote terminal address add Manchester's code mistake and state section addition Manchester's code mistake,
The mode for adding mistake in data words is included in synchronous head addition mistake, adds Manchester in parity check bit
Code error and data segment add Manchester's code mistake,
Arbitrary-function generator, for exporting MIL-STD-1553B signal waveforms according to the data point of generation, by the waveform
It is sent to MIL-STD-1553B level adapters；
MIL-STD-1553B level adapters, meet MIL- for the output signal of arbitrary-function generator to be changed into
Level standard as defined in STD-1553B agreements, message is sent to MIL-STD-1553B buses.
The beneficial effect of present embodiment：
The mode of failure is added as shown in figure 1, write instruction word or the synchronous head of status word are first begin to, if now
Need to add mistake, then add mistake in synchronous head, next when writing 16 valid data positions and parity check bit,
The need for failure is set, Manchester's code mistake can be added in 16 valid data, in parity check bit addition
One or more in Manchester's code mistake, simulated fault signal.
Arbitrary-function generator needs to export a variety of word format bus signals for meeting MIL-STD-1553B agreements, is used for
Carry out information transfer.The application has mainly used the random waveform function of arbitrary-function generator, i.e. user edits waveform successively
Point, signal source exports satisfactory MIL-STD-1553B signal waves form point according to predetermined configuration, so as to simulate protocol communication
Analog waveform.The part is not required the concrete model of arbitrary-function generator, but must is fulfilled for following condition.
Because MIL-STD-1553B agreement provisioning informations transmission speed is 1Mb/s, and MIL-STD-1553B coding staff
Formula is Manchester's code, so the peak signal output frequency of any wave energy of arbitrary-function generator necessarily be greater than
2Mhz.In addition, if it is desired to which zero crossing is inclined caused by simulating bus failure signal, such as Manchester mistake using the present invention
Difference, agreement regulation zero crossing deviation have to be larger than 25ns.So in this case, each MIL-STD-1553B up to
40 random waveform points are included less.So, because message as defined in one MIL-STD-1553B agreement of simulation at most includes 33
Individual word (simulation RT to RT message transmission)：
33 (word number) × 20 (the number during bus of a word) × 40=26400 point
That is, any wave energy of arbitrary-function generator is at least required to store 26400 data point ability
Enough meet emulates to MIL-STD-1553B mistakes.And in the range of the permission of arbitrary-function generator function, it stores energy
Power is stronger, and emulation of the present invention to bus signals also can just accomplish finer.
Because the driving force of arbitrary-function generator is not enough to directly with MIL-STD-1553B buses be connected, the present invention
MIL-STD-1553B level adapters have been used to complete this target.Global design scheme such as Fig. 3 institutes of the level adapter
Show.
The output signal of arbitrary-function generator, after transceiver, is changed into and meets MIL-STD-1553B agreements regulation
Level standard, so that failure simulation device is mounted in bus system.Arbitrary-function generator output just can be to true
Tested MIL-STD-1553B bus apparatus send message, complete fault test to equipment under test node.
Failure add module is used to carry out the program control of arbitrary-function generator and transmits waveform data points to it.
According to described previously, arbitrary-function generator needs to customize a large amount of waveform data points, if defeated using manual mode
Enter, it is clear that extremely expend the time.The application software on computer is write, this problem can not only be solved, additionally it is possible to by MIL-
The customization of STD-1553B bus words becomes more directly perceived.User is according to the need for oneself directly in software interface, and input is every
The transmission information of individual word, it is not necessary to extra again to consult MIL-STD-1553B bus protocols.
The control information that software is sent sends arbitrary-function generator to by peripheral hardware cable, can use LAN, USB, string
A variety of peripheral hardware cables such as mouth carry out equipment connections.Computer needs to install VISA, and VISA is that VXI plug＆play alliances formulate
The general name of I/O interface softwares standard and its specification.It provides the standard I/O function libraries programmed for instrument, referred to as VISA storehouses.
VISA function libraries are resided in computer system, are the standard software communication interfaces of computer and instrument, computer by it come
Controller unit.
By using VISA, the connection of arbitrary-function generator and computer can ignore specific involved by peripheral hardware cable
Communication protocol, i.e., connected using any cable, and application software can complete above-mentioned target.
Failure add module mainly has two-part function, and first is MIL-STD-1553B protocol groups words, is referred to as
MIL-STD-1553B words are formed., it is necessary to complete the customization of most 33 words in a protocol message transmission, the present invention is each
The customization of word is very flexible, with a set of identical group word flow.Second be the program control of instrument, including on and off is beaten in input and output
Close, the way of output configuration of the download of data point and signal etc..
(1) protocol groups word flow
Protocol groups word is the setting on software interface by user, becomes that arbitrary-function generator internal memory can be downloaded to
In data point.Idiographic flow is as shown in figure accompanying drawing 1.
This group of word requirements of process is carried out most 33 times, and this 33 times all data point then is integrated into a data flow,
Download for data point.
(2) instrument is program control
The program control order of the program control direct use instrument of instrument is realized, it should be noted that：
As it was noted above, process of the message transmission with " instrument response --- output " that the present invention is simulated, because arbitrarily
Function generator can only be as output device, and itself does not have signal input and detection and response function.So of the invention
Previously mentioned MIL-STD-1553B level adapters are coordinated to realize this process using the external trigger of instrument.
Software needs controller unit to be operated in " under external trigger pattern ", and set the Time delay of instrument for it is suitable when
Between.By taking the transmission for simulating RT to BC as an example, MIL-STD-1553B level adapters are receiving the rising of a coding line synchronous head
After, give arbitrary-function generator one trigger signal.Function generator needs to wait for a period of time again output signal to avoid
The conflict of bus message, the time is the time 20us of a word, so the Time delay for needing to configure instrument is at least 20us.
In preferred embodiment, when MIL-STD-1553B level adapters are communicated with remote terminal, fault-signal mould
Intend device as a bus control unit, coding line is sent to remote terminal, so as to simulate MIL-STD-1553B bus communications
Middle bus control unit sends message to remote terminal；Transmission/received bit in instruction segment determines transmission/reception instruction, if hair
Give/received bit sends is to send instruction, arbitrary-function generator exports the finger that has pre-seted using data point to remote terminal
Make word；If what transmission/received bit was sent is to receive instruction, fault-signal analogue means, which receives immediately receive after coding line, to be referred to
The data word of defined amount in order；
When MIL-STD-1553B level adapters are communicated with bus control unit, fault-signal analogue means conduct
One remote terminal, bus control unit sends coding line to remote terminal, and MIL-STD-1553B level adapters are used to detect
The rising edge of coding line is sent in MIL-STD-1553B buses, triggering is provided to the external trigger input of arbitrary-function generator
Signal so that arbitrary-function generator exports the status word and data word pre-seted using data point, so as to simulate MIL-
The message that STD-1553B bus communications remote terminal is exported to bus control unit.
The beneficial effect of present embodiment：
By this adapter, the simulation of the defined entire message form of MIL-STD-1553B agreements can also be realized.Cause
Be function generator as just output equipment, test if desired certain bus control unit (BC) to the response of fault-signal whether
Correctly, it is necessary to which the device is accessed with remote terminal (RT), and remote terminal is tested to the data transfer of bus control unit.According to
MIL-STD-1553B agreements transmission regulation, bus control unit is first to one transmission coding line of remote terminal transmission, remote terminal
The data word of loopback status word and respective numbers again.Because arbitrary-function generator is without the true MIL-STD-1553B buses of the image of Buddha
Node equally judges bus word, so the MIL-STD-1553B level adapters that the present invention is designed send coding line by detecting
Rising edge, to arbitrary-function generator external trigger input provide trigger signal so that arbitrary-function generator export user
The status word and data word pre-seted.
In preferred embodiment, MIL-STD-1553B level adapters include MIL-STD-1553B protocol transceivers and delay
Circuit,
MIL-STD-1553B protocol transceivers, meet MIL- for the output signal of arbitrary-function generator to be changed into
Level standard as defined in STD-1553B agreements, message is sent to MIL-STD-1553B buses；
Delay circuit, in cycle for ensureing to export the status word that presets and data word in arbitrary-function generator,
Valid data edge should not be received again, it is to avoid produce the bus response of mistake.
The beneficial effect of present embodiment：
Because the external trigger input of arbitrary-function generator can judge all valid data edges, level adapter prolongs
When circuit part cycle for being used to ensureing exporting whole preset datas in arbitrary-function generator in, valid data should not be received again
Edge.So as to ensure that arbitrary-function generator will not be triggered repeatedly, the bus response of mistake is produced.
Embodiment：
Fig. 4 to Figure 19 is the data transmission format in existing bus structures and bus.
1.MIL-STD-1553B bus brief introductions
MIL-STD-1553B bus abbreviation 1553B buses, its script is that the standard of U.S. army's Integrated Avionics System is total
Line.Because 1553B buses have higher reliability and security, it is widely used in Aeronautics and Astronautics, navigation and other weapons
On change system, there is the title of " a square army ".The history of the external existing many decades of research and application to 1553B buses,
1973, in order to simplify the line between different air equipment interfaces, improve the security of data transfer, US military and government
MIL-STD-1553 standards are disclosed, the military uses this standard in F16 fighter planes first, and this standard instead of for aircraft
The bulky equipment of data is transmitted between each several part, the performance of aircraft is greatly optimized.1978 after, US military was announced
MIL-STD-1553B standards simultaneously " freeze " standard, and the standard quotes till now always.Also corresponding army's mark has been formulated in the country
GJB289A is studied 1553B buses, and the research of complete import finally from the beginning is copied, and the country is to 1553B buses
Use also reached a new height, the bus standard has been successfully applied in newest opportunity of combat.
1.1. bus structures
Fig. 4 is 1553B bus topolopies；1553B buses are digital time-devision system instruction/response type multi-path transmission datas
Bus, it is mainly made up of data/address bus, terminal or subsystem terminal interface.Terminal is the interface electricity of data/address bus and subsystem
Sub-component, it can be bus control unit (BC), remote terminal (RT) or bus monitor (BM), the typical total knots of 1553B
Structure is as shown in Figure 1.Above-mentioned three kinds of basic communication terminals are interconnected by data/address bus, order that bus control unit is sent or
Data can be delivered to all remote terminals by data/address bus, and the condition responsive and data that each remote terminal is sent also may be used
It is delivered to remote terminal every other in bus control unit and bus.
(1) bus control unit (Bus Controller)
The control of bus, manager, are also the promoter of all communication operations.Only one of which terminal in any moment bus
Bus system is implemented to control.But can have the bus control unit of backup.
(2) remote terminal (Remote Terminal)
The effective order that bus control unit is received from bus is responded, loopback status word completes corresponding actions.
It does not possess bus marco function, but can as bus control unit backup.
(3) bus monitor (Bus Monitor)
There can be a bus monitor in bus, the monitoring of data, record in bus.It is not responding to total line traffic control
Any order of device processed, nor affects on the information transfer in bus.
1.2. data format
Data encoding format is as shown in figure 5, the numeric data code transmitted in 1553B buses is the type biphase level of Manchester II
Code.Logic 1 is bipolar coding signal 1/0 (i.e. one positive pulse is followed by a negative pulse).Logical zero is bipolar coding signal 0/
1 (i.e. one negative pulse is followed by a positive pulse).Bit Transmission Rate in bus is 1.0Mb/s, is half-duplex mode transmission,
Midpoint at each occurs for zero passage saltus step, as shown in Figure 2.
Data transfer in bus is that in units of message, message is by command word, three kinds of word classes of data word and status word
Type is constituted.Word length is 16 valid data positions plus synchronous head Parity bits totally 20, and word format is shown in Fig. 6.
(1) coding line
Coding line should be by synchronous head, remote terminal address field, transmission/received bit (T/R), subaddressing/mode field, number
Constituted according to word count/mode code field and parity check bit (P), wherein, transmission/received bit (T/R), subaddressing/mode word
Section and data word count/mode code field are referred to as instruction segment, and transmission/received bit (T/R) determines to send or receive instruction,
As shown in Figure 7.
Synchronous head
Coding line synchronous head should be invalid Manchester waveform.Waveform at first 1.5 is just, at latter 1.5
Waveform be negative.
◆ remote terminal address
It is remote terminal address section immediately following five after synchronous head.Each remote terminal is designated as a proprietary address,
It can be used from decimal address 0 to decimal address 30, but not use decimal address 0 as the proprietary of remote terminal as far as possible
Address.Decimal address 31 (11111) is the public address of all remote terminals, is used when using broadcast operation for system.
◆ transmission/received bit
Transmission/received bit represents to require the operation that remote terminal is made, the work reception operation of logical zero assigning remote terminal, logic 1
Assigning remote terminal is made to send operation.
◆ subaddressing/mode field
Subaddressing/mode field is used to specify the subaddressing of remote terminal, or as the control of bus system ways of carrying out
When mark.
◆ data word count/mode code field
The field be used to specify remote terminal should send, the number of data word that should receive or mode code.
◆ parity check bit
Last 16 even-odd check before of word, using odd.
(2) data word
Data word should be made up of synchronous head, data field and parity check bit (P), wherein, data field can also be called
Data segment, as shown in Figure 8.
Synchronous head
Data word synchronous head is invalid Manchester waveform.Waveform at first 1.5 is negative, ripple at latter 1.5
Shape is just.
◆ data segment
The data of 16 positions.
◆ parity check bit
Last 16 even-odd check before of word, using odd.
(3) status word
Status word is by status word synchronous head, remote terminal address field, message error position, means of testing position, service request
Position, spare bit, broadcasting instructions received bit, busy bit, subsystem identification position, dynabus control receive position, end mark position and strange
Even parity bit constitute, wherein, message error position, means of testing position, service request bit, spare bit, broadcasting instructions received bit, hurry
Position, subsystem identification position, dynabus control receive position and end mark position and are referred to as state section, as shown in Figure 9.
Synchronous head
Status word synchronous head is identical with coding line synchronous head.
◆ remote terminal address field
The field has five, for the address for the remote terminal for sending status word.It is corresponding that remote terminal address meets coding line
Regulation.
◆ message error position
For representing that this remote terminal in preceding paid-in message, has a word or multiple words to be surveyed not over validity
Examination.Logic 1 represents that message has mistake, and logical zero represents message zero defect.
◆ means of testing position
The position is always set to logical zero under all conditions.The position for can bit selecting be used for distinguish coding line or status word.Such as
Fruit uses, and the relevant position in coding line is logic 1.
◆ service request bit
This represents that this remote terminal needs service.It is required that bus control unit startup is relevant with this remote terminal or subsystem
Scheduled operation.Logic 1 indicates service request, and logical zero indicates no service request.The position is can bit selecting.
◆ stand-by state position
Stand-by state position gives over to be used from now on, they should be set into logical zero.
◆ broadcasting instructions received bit
The position be logic 1 when represent this remote terminal reception to upper effective instruction word be broadcasting instructions word.When being
When not using broadcast mode in system, the position is put for logical zero.
◆ busy bit
The position is that logic 1 represents that remote terminal is in busy condition, it is impossible to required according to the instruction of bus control unit by number
Data are taken out according to immigration subsystem or from subsystem.The position for can bit selecting, logical zero represent be not present busy condition.
◆ subsystem identification position
For pointing out there is subsystem fault state to bus control unit, and this remote terminal offer of warning bus control unit
Data may be invalid.The position is can bit selecting.Logic 1 indicates subsystem fault, and logical zero indicates no subsystem fault.
◆ dynabus receives position
If being set to logic 1, for representing that this remote terminal receives to meet giving orders for defined dynabus control.Logical zero
Expression does not receive.The position is can bit selecting.
◆ end mark position
The position is used as end mark function.Logic 1 represents there is failure inside this remote terminal, and request bus control unit is done
In advance.Logical zero represents that failure is not present.The position is can bit selecting.
◆ parity check bit
Odd is carried out to status word.
1.3. message format
1553B bus messages refer to include a coding line, status word and (or appear in remote terminal to remote terminal
Two coding lines, two status words during transmission), several data words (number of words from 0 to 32) and condition responsive be spaced in
Interior transmission sequence.The message transmitted in bus should be consistent with ten kinds of following forms, should not use any other message lattice
Formula.
(1) transmission from bus control unit to remote terminal
Bus control unit should send a data word for receiving coding line and defined amount to remote terminal, and the latter is in verification
After message, should beam back a status word should be sent out to controller, coding line and data word with the conitnuous forms without interword space
Go out, controller is as shown in Figure 10 to the transmission of remote terminal.(note：" # " represents message interval, " * * " represent corresponding interval)
(2) transmission from remote terminal to bus control unit
Bus control unit should be sent to remote terminal one transmission coding line, the remote terminal examine coding line after,
A status word should be sent back to bus control unit, the data word of defined amount is followed by.Status word and data word should be not have
The conitnuous forms of interword space are sent.Remote terminal is as shown in figure 11 to the transmission of controller.
(3) transmission from remote terminal to remote terminal
Bus control unit should send a reception coding line to remote terminal A, and then send a hair to remote terminal B
Coding line is sent, remote terminal B should send a status word, be followed by the data word of defined amount after coding line is examined.Shape
State word and data word should be sent with the conitnuous forms without interword space.It is during the data transfer ends that remote terminal B is sent and remote
A is after the data word of defined amount is received for journey terminal, should be by regulation corresponding state word.Biography from remote terminal to remote terminal
It is defeated as shown in figure 12.
(4) mode without data word is instructed
Bus control unit should use defined mode code to send a transmission coding line, the remote terminal to remote terminal
After coding line is examined, one status word of loopback, transformat is as shown in figure 13.
(5) mode with data word is instructed (transmission)
Bus control unit should use defined mode code to send a transmission coding line, the remote terminal to remote terminal
After coding line is examined, one status word of loopback is followed by one data word.Status word and data word should be between no words
Every conitnuous forms send.The mode of transmission belt data word instructs (transmission) as shown in figure 14.
(6) mode with data word is instructed (reception)
Bus control unit should use defined mode code to send a transmission coding line to remote terminal, be followed by one
Data word.Coding line and data word should be sent with the conitnuous forms without interword space.The remote terminal examine coding line and
After data word, one status word of loopback is answered.The mode of transmission belt data word instructs (reception) as shown in figure 15.
(7) bus control unit transmits (broadcast) to the broadcast of each remote terminal
Bus control unit sends the reception coding line that a remote terminal address field is 11111, is followed by defined amount
Data word, coding line and data word should be sent with the conitnuous forms without interword space.With reception broadcasting instructions ability
Each remote terminal after verification message, should by regulation in status word by broadcasting instructions received bit set, but not loopback state
Word.Controller transmits as shown in figure 16 to the broadcast of each remote terminal.
(8) remote terminal is to each remote terminal transmission (broadcast)
Bus control unit should send the reception coding line that a remote terminal address field is 11111, followed by using long-range
Terminal A proprietary address sends a transmission coding line to remote terminal A.Remote terminal A answers loopback after coding line is examined
One status word, is followed by the data word of defined amount.Status word and data word should be sent out with the conitnuous forms without interword space
Send.All should be after verification message, by regulation with each remote terminal (in addition to remote terminal A) for receiving broadcasting instructions ability
By broadcasting instructions received bit set in status word, but not loopback status word.Remote terminal is to each remote terminal transmission (broadcast)
As shown in figure 17.
(9) mode without data word is instructed (broadcast)
Bus control unit should send containing a mode code and remote terminal address field and be instructed for 11111 transmission
Word.Should be after coding line be examined with each remote terminal for receiving broadcasting instructions ability, will broadcast in status word by regulation
Command reception position position, but not loopback status word.Mode without data word instructs (broadcast) as shown in figure 18.
(10) mode with data word is instructed (broadcast)
Bus control unit should send containing a mode code and remote terminal address field and be instructed for 11111 reception
Word, is followed by transmission one data word.Coding line and data word should be sent with the conitnuous forms without interword space.With reception
Each remote terminal of broadcasting instructions ability should after verification message, by regulation in status word by broadcasting instructions receiving position
Position, but not loopback status word.Mode with data word instructs (broadcast) as shown in figure 19.
It is existing to produce the fault-signal needed using special MIL-STD-1553B customization output datas so as to more comprehensively
Test whole bus system, the problem of there is poor universality.
The fault-signal analogue means of MIL-STD-1553B bus nodes based on arbitrary-function generator, it includes appointing
Meaning function generator, failure add module and MIL-STD-1553B level adapters,
Failure add module, is realized by TekVISA softwares.And GUI panel is designed using LabWindows/CVI, calculate
The connection of machine and arbitrary-function generator can use netting twine, USB line or GPIB lines,
Model AFG3252C, AFG3102 or 33250A that arbitrary-function generator is used,
Any ripple generating function support reference frequency output 1mHz of model AFG3252C arbitrary-function generator~
120MHz, effective analog bandwidth (- 3dB) 225MHz；
MIL-STD-1553B level adapters use HI-1573 as MIL-STD-1553B protocol transceivers, and use
555 timers complete the design of delay circuit,
Failure add module, for inputting MIL-STD-1553B protocol groups words, in MIL-STD-1553B protocol groups words
Add fault-signal, protocol groups word generation data point；
It is described addition fault-signal detailed process be：
The communication information in bus is write with the coding line of 20, the status word of 20 and the data word of 20, according to event
Barrier demand, one or more kinds of mistakes are added in coding line, status word and data word, MIL-STD-1553B bus sections are constituted
The fault-signal of point；
Added in coding line mistake mode be included in synchronous head addition mistake, parity check bit addition mistake,
Instruction segment addition mistake and the addition Manchester's code mistake in every of coding line,
Added in status word mistake mode be included in synchronous head addition mistake, parity check bit addition mistake,
State section addition mistake and the addition Manchester's code mistake in every of status word,
Add in data words mistake mode be included in synchronous head addition mistake, parity check bit addition mistake,
Data segment addition mistake and the addition Manchester's code mistake in every of data word,
In order to realize the output of Manchester mistake, it is necessary to which arbitrary-function generator has depositing at least 80,000 data points
Energy storage power；
Arbitrary-function generator, for exporting MIL-STD-1553B signal waveforms according to the data point of generation, by the waveform
It is sent to MIL-STD-1553B level adapters；
MIL-STD-1553B level adapters, meet MIL- for the output signal of arbitrary-function generator to be changed into
Level standard as defined in STD-1553B agreements, message is sent to MIL-STD-1553B buses.
Claims (3)
1. the fault-signal analogue means of the MIL-STD-1553B bus nodes based on arbitrary-function generator, it is characterised in that
It includes arbitrary-function generator, failure add module and MIL-STD-1553B level adapters,
Failure add module, for inputting MIL-STD-1553B protocol groups words, is added in MIL-STD-1553B protocol groups words
Fault-signal, protocol groups word generation data point；
It is described addition fault-signal detailed process be：
The communication information in bus is write with the coding line of 20, the status word of 20 and the data word of 20, according to failure need
Ask, one or more kinds of mistakes are added in coding line, status word and data word, MIL-STD-1553B bus nodes are constituted
Fault-signal；
The mode that mistake is added in coding line is included in synchronous head addition mistake, adds Manchester's code in parity check bit
Mistake, remote terminal address add Manchester's code mistake and instruction segment add Manchester's code mistake,
The mode that mistake is added in status word is included in synchronous head addition mistake, adds Manchester's code in parity check bit
Mistake, remote terminal address add Manchester's code mistake and state section addition Manchester's code mistake,
The mode for adding mistake in data words is included in synchronous head addition mistake, adds Manchester's code in parity check bit
Mistake and data segment add Manchester's code mistake,
Arbitrary-function generator, for exporting MIL-STD-1553B signal waveforms according to the data point of generation, the waveform is sent
Give MIL-STD-1553B level adapters；
MIL-STD-1553B level adapters, meet MIL-STD- for the output signal of arbitrary-function generator to be changed into
Level standard as defined in 1553B agreements, message is sent to MIL-STD-1553B buses.
2. the fault-signal of the MIL-STD-1553B bus nodes according to claim 1 based on arbitrary-function generator
Analogue means, it is characterised in that
When MIL-STD-1553B level adapters are communicated with remote terminal, fault-signal analogue means is total as one
Lane controller, coding line is sent to remote terminal, so as to simulate in MIL-STD-1553B bus communications bus control unit to remote
Journey terminal sends message；Transmission/received bit in instruction segment determines transmission/reception instruction, if transmission/received bit transmission is
Instruction is sent, arbitrary-function generator exports the coding line pre-seted using data point to remote terminal；If transmission/reception
What position was sent is to receive instruction, and fault-signal analogue means, which is received, should immediately receive the data of defined amount in instruction after coding line
Word；
When MIL-STD-1553B level adapters are communicated with bus control unit, fault-signal analogue means is used as one
Remote terminal, bus control unit sends coding line to remote terminal, and MIL-STD-1553B level adapters are used to detect MIL-
The rising edge of coding line is sent in STD-1553B buses, trigger signal is provided to the external trigger input of arbitrary-function generator,
So that arbitrary-function generator exports the status word and data word pre-seted using data point, so as to simulate MIL-STD-
The message that 1553B bus communications remote terminal is exported to bus control unit.
3. the fault-signal of the MIL-STD-1553B bus nodes according to claim 1 based on arbitrary-function generator
Analogue means, it is characterised in that MIL-STD-1553B level adapters include MIL-STD-1553B protocol transceivers and delay
Circuit,
MIL-STD-1553B protocol transceivers, meet MIL-STD- for the output signal of arbitrary-function generator to be changed into
Level standard as defined in 1553B agreements, message is sent to MIL-STD-1553B buses；
Delay circuit, in the status word for ensureing to preset in arbitrary-function generator output and the cycle of data word, should
Valid data edge is received again, it is to avoid produce the bus response of mistake.
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