JPS6282836A - Data transmission equipment - Google Patents

Abstract

PURPOSE:To easily discriminate a faulty portion from corresponding relation between parallel data input terminals in a transmission part and parallel data output terminals in a reception part before and after the operation of a change- over switch by changing the corresponding relation on the basis of the operation of the switch. CONSTITUTION:When data D1-Dn are inputted to the parallel data input terminals I1-In in the transmission part 2a and abnormality is generated in the data appearing on a parallel data output terminal O2, the changeover switch SW is actuated and a transmission order switching circuit 10 is driven. If abnormality is generated on the terminal I2 side of the transmission part 2a, abnormality appears also on a terminal O1 of the receiption part side. When abnormality is generated on the terminal O2 side under said state, the abnormality on the terminal O2 side can not removed even if any data is inputted to a terminal I3 on the transmission part 2a side. Thereby, the portion generating the abnormality can be easily discriminated by operating the SW connected to the terminals I2, I3 to apply a prescribed signal and observing the state of signals appearing on the terminals O1, O2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a data transmission device that can easily determine the location of a failure.

U Explanation of the prior art As an example of a conventional data transmission device, for example,
There is a dual-use device as shown in Japanese Patent No. 2-13367.

Examples of these conventional data transmission devices will be briefly explained using FIGS. 5 and 6. , Figure 5 provides an overview, and Figure 6 provides an overview.
The figure shows details.

The data transmission device includes a data creation section 1 that creates multiple bits of parallel data, a transmission section 2 that converts the created parallel data into serial data and sends it to a serial transmission line 3, and a serial data that is sent from the transmission line 3. It is configured to include a receiving section 4 that receives data and converts it into parallel data, and a data processing section that inputs the parallel data output from the receiving section 4 and processes the data. Data creation section 1
is, for example, a lamp switch or something that consists of a certain circuit. Further, the data processing section 5 is composed of a relay driving section, a lamp lighting circuit, and the like.

As shown in detail in FIG. 6, the transmitter 2 includes a timing generator 6 and a shift register 7. Then, the transmitter 2 receives the n output from the data generator 1.
Parallel data from ~ to parallel data input terminal I
t, 12, . . . in, and input to each bit of the shift register 7. The shift register 7 sequentially outputs the data received in each bit one bit at a time from the beginning to the serial data output terminal SO in accordance with instructions from the timing generator 6.

Further, the receiving section 4 also has a timing generator 8 and a shift register 9. Then, the receiving section 4 takes in the serial data received at the serial data input terminal Si into the shift register 9 at a predetermined timing in response to an instruction from the timing generator 8, and transfers the taken data to the parallel data output terminals 01, 02, . . . ...Qn
The data is output to the data processing section 5.

As shown in this example, in a data transmission device, the parallel data input terminal 1+ of the transmitter 2 is generally used.

12, ......In are parallel data output terminals 0+, 02, ......Q of the receiving section 4
This corresponds to a one-to-one relationship with n.

Note that the timing generator 6 of the transmitter 2 and the receiver 4
As a method of synchronizing with the timing generator 8 of
In this example, a method is described in which the timing generator 8 on the receiver section 4 side watches the transmission signal and determines that data transmission has started and starts operating, but another method is to use a clock line that connects the timing generators. Some are used.

Also, a start bit, stop bit, or parity bit may be added to the bits of the transmission data, but these bits are added as appropriate depending on the system configuration of the data transmission device.

However, in such conventional data transmission devices, the transmission order of multiple bits of data is fixed, so if there is a failure, for example, the data processing unit 5 may fail even though a switch is pressed in the data creation unit 1. When there is a bit that does not operate, there is a problem in that it is not clear whether the transmitter 2 side or the receiver 4 side is malfunctioning.

That is, for example, a problem has occurred in the data transmission of the i-th bit of the parallel data of n pits, that is, even though the data of the i-th bit has been changed in the data creation section 1, the data processing section 5 Considering the case where no signal change appears, it is not known whether the transmission operation of the i-th data is defective or the reception operation of the i-th data is defective.

Therefore, if a failure occurs as in this example, the transmitter 2
Then, sequential inspections such as the receiving section 4 were required, and it was not possible to directly inspect the faulty part.

Incidentally, the transmitting section 2 and the receiving section 4 are often made into units, respectively, and if a failure occurs in a data transmission device that is made into a unit, conventionally, the transmitting side unit and the receiving side unit are Since it is not known which unit is malfunctioning, both units are replaced at the same time, or only one is replaced, and if the malfunction is resolved, the other is replaced. However, replacing both units at the same time is economically wasteful, and replacing one unit at a time requires a lot of effort and time.

[Object of the Invention] It is an object of the present invention to provide a data transmission device that improves the above-mentioned problems and allows easy identification of a faulty part.

[Summary of the Invention] In order to achieve the above object, the present invention provides a data transmission circuit that transmits multi-bit parallel data created by a data creation unit to a data processing unit in at least two types of permutations, and A data transmission device is configured by having a transfer order switching circuit capable of switching the permutation, and in the event of a failure, by changing the transmission order, the correspondence between the parallel data input terminal of the transmitting section and the parallel data output terminal of the receiving section is established. By changing the code and checking the operating status of certain bits, the location of the failure can be determined.

[Explanation of actual droplet example] Hereinafter, this invention will be described in sequence by citing three examples.

(First Embodiment) FIGS. 1 and 2 are a circuit diagram of a transmitter and an explanatory diagram of its operation, showing a first embodiment of the present invention.

Although FIG. 1 shows only the transmitting section 2a, this transmitting section 2
a is connected to the receiving section 4 shown in FIG. 6, and the overall system configuration is the same as that shown in FIG. 5.

The transmitter 2a has a timing generator 6 and a shift register 7 similar to those shown in FIG. 6, and also has parallel data input terminals r+, I2, . . .
It has one port and a serial data output terminal SO.

In this example, the parallel data input terminal It
, 12 , . . . It has a transmission type switching circuit 1o provided between the in and the shift register 7, and a changeover switch SW for switching this circuit.

In the illustrated state, the transmission type switching circuit 10 has parallel data input terminals 11 . I2. ......n-bit data input from In, D+, D2,...
... [)n to shift register 7 from the first bit D
＋.

D2......Dn are given in order, but when the changeover switch SW is set to 1)+, D2, D3......D+ are given in order from the beginning of the shift register 7. They will be given in order. That is, the data permutation 02, D3, etc. of the shift register 7 after the transmission type switching circuit 10 is activated.
...Dl is the original permutation D+, D2...
...[) Compared to n, the order is moved up by 1.

Parallel data input terminal 1+, I2...
・In and parallel data output terminal 01.02...
...The correspondence relationship of On is as shown in FIG. In the figure, the response before the transmission type switching circuit 10 is activated is shown by a two-dot chain line, and the response after activation is shown by a solid line.

Next, the operation of this embodiment will be explained.

In a normal normal state, the transmission type switching circuit 10 is not operated, and the data D+, D2......[)n inputted from the parallel data input terminal of the transmitter 2a are serially transmitted in this permutation. The parallel data output terminal 0+ of the receiving section 4 shown in FIG. 6 is output to the data output terminal 3o,
02......It will be output to On.

However, now suppose that, for example, the data appearing at the parallel data output terminal 02 becomes abnormal.

As far as this goes, is the receiving part corresponding to the parallel data output terminal o2 of the receiving part 4 (see FIG. 6) abnormal, or the transmitting part corresponding to the parallel input terminal I2 of the transmitting part 2a abnormal? It is unknown.

Therefore, in such a case, the transmission type switching circuit 10 is activated by operating the changeover switch SW.

Then, the parallel data input terminal I+ of the transmitter 2a,
The correspondence relationship between 12......In and the parallel data output terminals (h, 02......Qn of the receiving section 4 is shown by the solid line in Fig. 2. .

Here, if the parallel data input terminal I of the transmitter 2a
If there is an abnormality on the receiving section 2 side, then the abnormality should also appear on the parallel data output terminal 01 on the receiving section 4 side. Also, in this state, if there is an abnormality on the parallel data output terminal 02 side of the receiving section 4, no matter what data is input to the parallel data input terminal 3 on the transmitting section 2a side, it will not be received. The abnormality should remain on the side of the parallel output terminal 02 of the section 4.

Therefore, by applying a predetermined data signal to the parallel data input terminals I2 and I3, for example, by operating the switches connected to these terminals 12 and 13, the parallel data output terminal 0+
, 02, it is possible to determine which part of the transmitting section 2a and receiving section 4 is experiencing an abnormality.

Once the location of the abnormality has been identified, the unit in question can be replaced, or the part in question can be inspected and repaired.

(Second example) FIG. 3 shows a second embodiment.

The transmitter 2b shown in this example is obtained by replacing the transmission type switching circuit 10 shown in FIG. 1 with a transmission type switching circuit 11.

This transmission type switching circuit 11 is provided at the gate between the shift register 7 and the serial data output terminal SO, and is connected to the shift register 7 with the first bit and the next bit.

Then, when the changeover switch SW is not operated, the transmission type switching circuit 11 outputs serial data to the serial data output terminal DO in the order of D+, D2...Dn from the first bit of the shift register 7. However, when the changeover switch SW is operated, D2 starts from the next bit.
, D3...[)n, D+, and outputs serial data to the serial data output terminal DO in this order.

The operation of this embodiment is similar to that of the first embodiment shown in FIG.

In this example, the switching circuit 11 changes the first bit to the next bit]
I showed an example of switching to ~, but the next second, third...
It is also possible to change the correspondence between the parallel data input terminal and the parallel data output terminal by switching the bits . . . . .

(Third example) FIG. 4 shows a third embodiment.

In this transmitter 2C, the shift register 7 shown in FIG. 3 is changed to a bidirectional shift register 7a, and the transmission type switching circuit 11 is changed to a transmission type switching circuit 12.

The bidirectional shift register 7a operates in the same way as the shift register 7 shown in FIGS. 1 and 3 when the changeover switch SW is not operated, but operates in the opposite direction when the changeover switch SW is operated. do.

The transmission type switching circuit 12 is provided between the bidirectional shift register 7a and the serial data output terminal SO, and is connected to the bidirectional shift register 7a so that the leading bit and the trailing bit can be switched.

The transmitter 2C has parallel data input terminals 1+, 12, . . . when the changeover switch SW is not operated.
...Data from in D+, D2...
・[in is output to the serial data output terminal SO in the order of D+, D2...[)n, and when the changeover switch SW is operated, this order is changed to Dn, [)n- 1
......The order is D+.

Therefore, in this embodiment as well, the parallel data input terminal I+
, 12......Ln and the parallel data output terminals 0+, 02......On can be changed by operating the selector switch SW, and the appearance of a failure can be changed. By applying a predetermined data signal to the parallel data output terminal corresponding to the parallel data output terminal, it is possible to determine the location of the failure in the same manner as shown in FIG.

In addition, in the above embodiment, an example was shown in which a parallel data transfer order switching circuit was provided in the transmitting section to switch the transmission order.
It goes without saying that a parallel data reception order switching circuit may be provided in the receiving section and this circuit may be switched by a changeover switch.

[Effects of the Invention] In the data transmission device according to the present invention, the correspondence relationship between the parallel data input terminal of the transmitting section and the parallel data output terminal of the receiving section can be changed by operating the changeover switch.
It becomes possible to immediately know the faulty part from the correspondence between before and after operation of the changeover switch, and it becomes easy to repair or replace the faulty part.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a transmitting section of a data transmission device showing a first embodiment of the present invention, and FIG. 2 is an explanatory diagram of its operation. FIG. 3 is a circuit diagram of the transmitter according to the second embodiment, and FIG.
FIG. 3 is a circuit diagram of a transmitter according to an embodiment. 5 and 6 relate to a conventional example, with FIG. 5 showing a schematic diagram of a data transmission device, and FIG. 6 showing a detailed circuit diagram thereof. 2.2a, 2b, 2c --- Transmitting section 4 --- Receiving section 7 --- Shift register 7a --- Bidirectional shift register 10.11.12 --- Transmitting type switching circuit SW --- Changeover switch Patent applicant Nissan Motor Co., Ltd. Figure 1
(1st fact, A column) 2nd (1st C party note) Fig. 3 (
12 Tora-kata answer A row) b Fig. 4 (Kaya 3 Sho-Ko-Ki row)

Claims (1)

[Claims] Consisting of a data transmission circuit that transmits multiple bits of parallel data created by a data creation unit to a data processing unit in at least two types of permutations, and a transmission order switching circuit that can switch the permutation in the event of a transmission error. data transmission equipment.