JPH05236574A - Communication equipment - Google Patents

Abstract

PURPOSE:To provide the communication equipment continuing communication without effect of other terminal processing unit even when a fault of address change takes place in a terminal processing unit. CONSTITUTION:Plural communication means 100A-100D... sending/receiving information relating to the operation of a terminal equipment and a signal transmission line 101 intrconnecting the communication means 100A-100D..., a communication opposite party is selected by a specific address set to the communication means 100A-100D... for the communication and the specific address set to the communication means 100A-100D... is defined by plural binary bits and the address of the communication means 100A-100D... is set by a binary number not in duplicate with the address set to the other communication means even when any bit in the plural bits is changed in the address.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device capable of driving operation signals of a large number of operation units via a small number of connecting lines to drive corresponding terminal devices.

[0002]

2. Description of the Related Art A conventional vehicle communication device will be described with reference to FIG. This vehicle communication device is composed of a central control device 1, terminal processing devices 2A to 2C, a multiple signal transmission line 21, and the like. The central control device 1 includes terminal processing devices 2A to 2C.
A communication control circuit 4 for performing communication control with the communication control circuits 8 to 10, a microprocessor (hereinafter referred to as MPU) 5, and a memory 6. In addition, the terminal processing device 2
A is connected to the lamps 11 and 12 and the motor 13, the terminal processing device 2B is connected to the switch 15 and the motor 14, and the terminal processing device 2C is connected to the switches 16 to 20. The central control unit 1 receives the operation signals of the switches 15 to 20 of the terminal processing units 2B and 2C via the multiplex signal transmission line 21, and temporarily stores those signals in the memory 6.
Then, based on these signals, the terminal processing devices 2A, 2
Lamps 11, 12 and motors 13, 1 connected to B
A control signal for driving and stopping 4 etc. is transmitted.

Here, the central control unit 1 and the terminal processing unit 2
The communication signal with A to 2C includes the address of each terminal processing unit, and the central control unit 1 identifies the terminal processing units 2A to 2C by this address. Each of these terminal processing devices 2
The addresses A to 2C are set by the address setting units 8a to 10a of the respective communication control circuits 8 to 10. Each of the address setting units 8a to 10a has 3 bits corresponding to binary bits 1 to 3.
Address ports are provided, and the address of each terminal processing device 2A to 2C is set by a combination of presence or absence of pull-down resistors R1 to R4 between these address ports and ground.

8A to 8C show the address setting units 8a to 10a of the terminal processing devices 2A to 2C shown in FIG. 7, and a conventional address setting method will be described with reference to these drawings. In the address setting unit 8a of the terminal processing device 2A, the bi
A pull-down resistor R1 is connected between the address port of t1 and ground, and nothing is connected to the address ports of bits 2 and 3. The address port to which the resistor is connected becomes low level, and the address port to which nothing is connected becomes high level. Below, a low level is represented by 0 and a high level is represented by 1. Therefore, FIG.
As shown in, depending on the state of the address port of bit 1 to 0 or 1, the address of the terminal processing device 2A is "0,
It becomes 1,1 ". Similarly, as shown in FIG. 8B, in the address setting unit 9a of the terminal processing device 2B, bit1,
2 address ports with pull-down resistors R2 and
3 is connected, and the address of the terminal processing device 2B is “0,
0,1 ”. Further, as shown in FIG. 8C, in the address setting unit 10a of the terminal processing device 2C, bit2
The pull-down resistor R4 is connected to the address port of
The address of the terminal processing device 2C is "1, 0, 1".

[0005]

However, in the above-described conventional vehicle communication device, the state of the address port may change and the set address may change due to an open failure of the pull-down resistor or a ground failure of the address port. is there. As a result, not only the communication between the faulty terminal processing unit and the central control unit is disabled, but also when the address changed due to the fault becomes the same as the address set in another terminal processing unit, the central control unit can There is a risk of communicating with a terminal processing device different from the terminal processing device specified by the address.

This problem will be described by taking the vehicle communication device shown in FIGS. 7 and 8 as an example. For example, when the pull-down resistor R2 connected to the address port of bit2 of the address setting unit 9a has an open circuit failure, the address of the terminal processing device 2B changes to “0,1,1” and the address of the terminal processing device 2A. Will be the same as At this time, when the central control device 1 transmits a control signal for turning on the lamp 12 connected to the terminal processing device 2A, the terminal processing device 2A turns on the lamp 12 in response to the control signal and the terminal processing is performed. The device 2B also mistakenly recognizes that the control signal is a control signal to itself and drives the motor 14. When the pull-down resistor R3 connected to the address port of bit1 of the address setting unit 9a has an open circuit failure, the address of the terminal processing device 2B changes to "1, 0, 1",
It is the same as the address of the terminal processing device 2C. At this time,
When the switch 15 connected to the terminal processing device 2B is operated, the central control device 1 mistakenly recognizes that the switch 16 connected to the terminal processing device 2C is operated and performs an erroneous process.

An object of the present invention is to provide a vehicular communication device which can continue communication without being affected by another terminal processing device even if a failure occurs in which the address changes in one terminal processing device. ..

[0008]

The present invention will be described with reference to FIG. 1 which is a claim correspondence diagram. The invention of claim 1 is based on a plurality of communication means 100A for transmitting and receiving information relating to the operation of a terminal device of a vehicle. ˜100D ... And the signal transmission line 10 for connecting these communication means 100A to 100D.
1 is applied to a communication device that performs communication by selecting a communication partner with a unique address set in each of the communication means 100A to 100D. And each communication means 10
A unique address set to 0A to 100D ... Is defined by a binary number of a plurality of bits, and each communication means 100A to 100D is defined.
The address of D ... Is set by a binary number that does not overlap with the address set in other communication means even if the value of any one bit of a plurality of bits changes, thereby achieving the above object. .. Each communication means 100A-100 of Claim 2
The address of D ... Is such that the number of 0s or 1s forming a binary number is the same for any address.

[0009]

[Function] Even if the value of any one of the plurality of bits changes, the communication partner is selected and communicated by the address set in the binary number so as not to overlap with the address set in the other communication means. To do. Therefore, even if the value of any one bit of the plurality of bits changes due to some failure in a certain communication means, the other communication means can continue communication without being affected.

[0010]

FIG. 2 is a block diagram showing the configuration of an embodiment, and FIG. 3 is a diagram showing an address setting unit of each terminal processing device.
In this embodiment, the address setting units 8b, 9b and 10b are used.
7 is the same as that of the conventional device shown in FIG. 7, and the same reference numerals are given to the same devices, and the differences will be mainly described. In the address setting unit 8b, the pull-down resistors R5 and 6 are connected to the address ports of bits 1 and 2, respectively, and the address of the terminal processing device 2A becomes "0, 0, 1" as shown in FIG. In the address setting unit 9b, pull-down resistors R7 and R8 are connected to the address ports of bits 1 and 3, respectively, and the address of the terminal processing device 2B becomes "0, 1, 0" as shown in FIG. 3B. ..
Furthermore, in the address setting unit 10b, pull-down resistors R9 and 10 are connected to the address ports of bits 2 and 3, respectively, and the address of the terminal processing device 2C becomes "1, 0, 0" as shown in FIG. ..

Usually, the address setting units 8b, 9b, 10b
The failure that is expected to occur in the above is a failure in which the state of the address port changes from 0 to 1 due to an open failure of the pull-down resistors R5 to R10, a circuit disconnection, or the like.
Address port is grounded and address port status is 1
From 0 to 0, or a failure in which the state of the address port changes only for a short time due to noise mixed in the address port. However, the address setting units 8b, 9b,
Even if such a failure occurs somewhere in 10b, the address after the failure changes to an unset address that is not set in any terminal processing device, and the same address as that set in other terminals. It does not change to. For example,
When the pull-down resistor R7 connected to the address setting unit 9b has an open circuit failure, the address of the terminal processing device 9B changes to "0, 1, 1", but the changed address is the other terminal processing device 9A. , 9C does not match any of the addresses set in 9C. Also, for example, when the address port of bit2 of the address setting unit 9b is grounded, the address of the terminal processing device 9B changes to "0,0,0", but the changed address is the other terminal processing device 9A, 9.
It does not match any of the addresses set in C.

By the way, the state of an address port is 0
Changes from 1 to 1 and the status of other address ports changes from 1 to 0
When the failure that changes to 2 occurs at two locations at the same time, the address changed due to the failure may be the same as the address of another terminal processing device. However, the probability of occurrence of such a failure is extremely low, and it is sufficient to prevent a failure that occurs at one location at a time point, and failures that occur simultaneously at two locations need not be considered.

In FIG. 4, the address of the terminal processor is set to 3 [b
An example of setting when it is set by a binary number of [it] is shown. Even if the status of any one of the address ports changes from 0 to 1 or from 1 to 0, an address whose changed address does not match an address set in another terminal processing device is the address B ". 0,0,1 ”, address C“ 0,
1,0 ”and address E“ 1,0,0 ”, and these addresses are adoptable addresses. In addition, the address C, which is obtained by inverting the "0" and "1" of the addresses B, C, and E,
A combination of E and F can also be adopted. When there are two terminal processing devices, the address A “0,0,0” and the address H “1,1,1” may be adopted.

FIG. 5 shows the address of the terminal processing device as 4 [b].
An example of setting when it is set by a binary number of [it] is shown. Even if the status of any one of the address ports changes from 0 to 1 or from 1 to 0, an address whose changed address does not match an address set in another terminal processing device is an address D ". 0,0,1,1 ", address F
"0,1,0,1", address G "0,1,1,0",
Address K “1,0,0,1”, Address L “1,0,
1,0 ”and address N“ 1,1,0,0 ”, and these addresses are adoptable addresses.

In FIG. 6, the address of the terminal processing device is set to 6 [b
An example of setting when it is set by a binary number of [it] is shown. In the figure, the status of any one address port is 0 to 1.
Addresses A to T such that the changed address does not match the address set in another terminal processing device even if the change is made to or from 1 to 0.

Generally, when setting the address of the terminal processing device with an even number N [bit] (N = 2n), 0 and 1 are set.
The number of addresses that can be adopted is maximized by selecting a combination in which both and are n [bit]. The maximum number of addresses is {N × (N-1) × (N-2) × ・.
... × (N−n + 1)} / n! Is. In addition, the address of the terminal processing device is set to an odd number N '[bit] (N' = 2n
When setting with +1), 0 is n [bit] and 1 is (n
+1) [bit], or 0 is (n + 1)
By selecting a combination in which 1 is n [bit] in [bit], the maximum number of addresses that can be adopted is maximized. The maximum number of addresses is {N'x (N'-1) x ...
(N'-n)} / n! Is.

In the case of a failure in which noise is mixed in the address port and the address changes only for a short time, the communication with the central control unit 1 can be resumed when the address returns to the original address. On the other hand, in the case of a failure such as an open failure of the pull-down resistors R5 to 10, in which the failure state continues and the address remains changed, the central control device 1 loses transmission from a specific terminal processing device. By detecting this, the occurrence of a failure in this terminal is determined. And if a failure occurs,
You may make it perform an emergency process, such as substituting a calculation in another terminal.

As described above, an address is set in each terminal processing device by a binary number so that even if the value of one bit among a plurality of bits changes, it does not overlap with the address set in another terminal processing device. By doing so, the terminal processing devices other than the defective terminal processing device can continue to communicate with the central control device. Further, since the number of 0s or 1s in the binary number is half of the number of address bits and is the same for any address, the maximum number of addresses satisfying the above condition can be obtained.

In the above embodiment, the case where the address of the terminal processing device is set by a binary number of 3, 4, 6 [bit] has been described as an example, but the number of bits is not limited to the above embodiment.

In the above embodiment, the vehicle communication device having one central control unit and three terminal processing units has been described as an example. However, the number of central control units and terminal processing units is the same as in the above embodiment. Not limited.

Further, in the above embodiment, the address of each terminal processing device is set depending on whether or not a pull-down resistor is connected between the address port of the address setting unit and ground. A memory may be provided and the address set by the above-described setting method may be stored in the memory. In this case, according to the address setting method described above, 1 [bit] of the address stored in the memory is changed, or 1 [bit] is read when the address is read.
Even if [bit] changes, the address does not become the same as the address set in another terminal processing device, and the other terminal processing device can continue communication without being affected.

In the configuration of the above embodiment, the communication control circuits 4, 8, 9 and 10 serve as communication means and the multiple signal transmission line 21.
Respectively constitute signal transmission paths.

[0023]

As described above, according to the invention of claim 1, even if the value of one bit among a plurality of bits is changed, it does not overlap with the address set in other communication means. Since the address of the communication means is set by a base number, communication can be continued without being affected by other communication means other than the failed communication means. According to the invention of claim 2, the address of each communication means is set so that the number of 0s or 1s in the binary number is the same in any address. Therefore, one of a plurality of bits is set. Even if the bit value changes, it is possible to obtain the maximum number of communication means having addresses that do not overlap with the addresses set in other communication means.

[Brief description of drawings]

FIG. 1 is a diagram for responding to a complaint.

FIG. 2 is a block diagram showing the configuration of an embodiment.

FIG. 3 is a diagram showing an address setting unit.

FIG. 4 is a diagram showing a setting example when the address of the terminal processing device is set by a binary number of 3 [bit].

FIG. 5 is a diagram showing a setting example when the address of the terminal processing device is set in a binary number of 4 [bit].

FIG. 6 is a diagram showing a setting example when the address of the terminal processing device is set by a binary number of 6 [bit].

FIG. 7 is a block diagram showing a conventional vehicle communication device.

FIG. 8 is a diagram showing an address setting unit of a conventional terminal processing device.

[Explanation of symbols]

 1 Central Control Unit 2A, 2B, 2C Terminal Processing Unit 4, 8, 9, 10 Communication Control Circuit 5 Microprocessor (MPU) 6 Memory 8b, 9b, 10b Address Setting Unit 11, 12 Lamp 13, 14 Motor 15-20 Switch 21 multiple signal transmission line R5-R10 pull-down resistor 100A, 100B, 100C, 100D communication means 101 signal transmission line

Front Page Continuation (72) Inventor Yuko Echigo 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd.

Claims (2)

[Claims] 1. A plurality of communication means for transmitting and receiving information relating to the operation of a terminal device, and a signal transmission line for connecting these communication means, wherein a communication partner is set by a unique address set in each communication means. In a communication device for selecting and communicating, a unique address set in each of the communication means is defined by a binary number of a plurality of bits, and the address of each communication means changes in any one bit of the plurality of bits. A communication device characterized by being set in a binary number so as not to overlap with an address set in another communication means. 2. The communication device according to claim 1, wherein the addresses of the respective communication means are such that the number of 0s or 1s constituting a binary number is the same at any address. ..