JPS61278236A - Transmission and reception equipment - Google Patents

Abstract

PURPOSE:To improve the reliability of transmission and reception by providing a reply means returning a reply signal representing the reception of a signal sent simultaneously to a transmitter to an optional receiver when the signal sent simultaneously to all receivers is received. CONSTITUTION:A signal discrimination means 35 discriminates whether a packet signal P is a signal (2nd kind signal) designating all personal computers 3-6 or not. The 1st reply means 37 is opened when the input means 36 receives the packet signal P (1st kind signal). An optional personal computer, e.g., personal computer 4, in the computers 34n6 is provided with the 2nd reply means S. The 2nd reply means S is operated when the sent packet signal P is the 2nd kind signal and returns a reply signal representing the reception of the said packet signal P to the host computer 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmitting/receiving device, and particularly to a transmitting/receiving device that enables highly reliable transmission and reception.

[Conventional technology]

Generally, transmission and reception are performed between a transmitting device and a receiving device.

By the way, a transmitting/receiving device is known in which, when the receiving device receives a signal from the transmitting device, the receiving device returns a response signal indicating that the signal has been received to the transmitting device.

Figures 8 to 12 show this type of transmitter/receiver.

Figure 8 shows, for example, rKEC-HBSVl, 1 baseband transmission control LSI M5L8049:353P-8: Kansai Electronic Industry Promotion Center HBS Study Group, 1932.
1 is a system circuit diagram of a conventional communication control device published on March 1, 1999.

In the figure, () indicates a host computer, and 2 indicates a home bus (home information transmission line). Further, 3,4°5.6 indicates a personal computer which transmits and receives signals to and from the home computer 1 via the home bus 2.

7.8, 9, 10.11 are the above host computer 1.
A communication control module provided in each personal computer 3.4, the communication control module Lua~11
is designed to control the above transmission and reception.

Further, FIG. 9 shows details of the host computer 1 or personal computers 3 to 6 and the vicinity of the communication control modules 7 to 11.

In the figure, 12 is a transceiver functioning as an interface for the communication control modules 7-11, and 13 is an interface for the host computer 1 or personal computers 3-6. Further, (A) shows a self-address setting switch for setting a self-address so as to distinguish the host computer 1 or each of the personal computers 3 to 6 from each other. 14 is an external RAM.

The communication control modules 8 to 11 provided in the personal computers 3 to 7 are equipped with a response means 15 for transmitting a response signal indicating that the signal has been received when the signal from the host computer 1 is received. The host computer 1 has a confirmation function that confirms that the signal has reached the destination when the response signal is received.

Next, the effect will be explained. Note that, below, a case will be described in which the host computer 1 functions as a transmitting device and the personal computers 8 to 11 function as receiving devices.

First, let us assume that the host computer 1 specifies, for example, the personal computer 4 and outputs a signal (hereinafter referred to as a packet signal P). Then, the communication control module 7
transmits the packet signal (P) received from the home computer 1 to the communication control module 9 via the home bus 2.
The response means 15 of the communication control module 9 receives this and sends an AC signal as a response signal to the communication control module 7 on the host computer 1 side.
Answer K). By receiving this response signal, the communication control module 7 can confirm that the packet signal has been certainly received by the communication control module 9 of the four personal computers. FIG. 10 shows the structure of a frame of a packet signal (P) used for communication.

Among these, DA16 indicates the destination address of the packet signal (P), and this number can be varied from 0 to 255.
In the case of .about.255, this number uniquely indicates the destination, and in the case of O, it indicates that all the packets are simultaneously transmitted to the communication control modules 8 to 11 as -simultaneous broadcast.

Now, FIGS. 11 and 12 show the exchange of packet signals between each of the communication control modules 7 to 11 described above. In the eleventh example, a packet signal (P) is transmitted from the communication control module 7 to the communication control module 10, and an ACK signal is responded to as a response signal. In addition, in FIG. 12, DA16 is
The figure shows how a packet signal transmitted as 1 is received by all communication control modules 8 to 11.

[Problem that the invention seeks to solve]

However, in the transmitting/receiving device according to the prior art,
When a signal is sent from the host computer 1 to all the personal computers 3-6 at the same time, no response signal is sent back from all the personal computers 3-6. That is, if all the personal computers 3 to 6 send response signals indicating that they have received the signal at the same time, the response signals will collide with each other, and as a result, the host computer 1 will not be able to accurately receive the response signals. Therefore, in such cases,
The configuration was such that no response signal was sent back.

On the other hand, if the response signals are staggered and outputted for each personal packet computer 3 to 6, collisions between the response signals will be resolved, but on the other hand, this will require time and the transmission/reception efficiency will decrease. There is a problem with this.

Therefore, an object of the present invention is to make it possible to efficiently return a response signal from a receiving device to a transmitting device even when a signal is transmitted from a transmitting device to all receiving devices at the same time, thereby increasing the reliability of transmission and reception. To provide transmitting and receiving equipment.

[Means for solving problems]

According to the present invention, any one receiving device is provided with a response means for sending a response signal to that effect back to the transmitting device when a signal transmitted simultaneously to all receiving devices is received.

[Effect]

When receiving a signal specifying all receiving devices, the response means outputs a response signal to that effect to the transmitting device.

This allows the transmitting device to confirm that the signal has been received.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 7. Note that the same components as those in the prior art are given the same reference numerals, and the description thereof will be omitted.

However, first, as a premise, the structure (frame structure) of a signal (hereinafter referred to as packet signal P) used in the present invention will be explained based on FIG. The frame structure of the packet signal (P) is PRE21,5 as shown in the figure.
A22. DA23°CW24. BC25, DATA26
．． It consists of 27 FCCs.

The PRE 21 is used for gain adjustment of a modem (modulator/demodulator) to be described later. Further, 5A22 indicates a source address for specifying the destination, and DA23 indicates a destination address for specifying the destination.

Further, CW24 is a control code for controlling transmission, BC25 is the number of bytes of data to be transmitted, and DATA26 is a control code for controlling transmission.
indicates the content of the data, and further, FCC27 indicates a frame check code for detecting transmission errors. Here, the above D
As shown in the figure, A23 is composed of an address section 28 and a -broadcast flag BROD29, and the address section 28
uniquely indicates the destination address, and the above-mentioned simultaneous broadcast flag BROD29 indicates that the flag BROD29 is 1.
In the case of -, it indicates simultaneous broadcasting, that is, the signal is transmitted to all receiving devices at the same time.

Next, the present invention will be explained in detail.

First, in FIG. 1, reference numerals 30, 31, 32, and 33 indicate communication control modules provided in the personal computers 3, 4° 5.6 according to the present invention.

Each of these communication control modules 30, 31. ．． 32°33
includes a self-designation determining means 34, a signal determining means 35,
A signal input means 36 and a first response means 37 are provided.

The self-designation determining means 34 determines whether the packet signal (P) transmitted by the host computer 1 is a signal that designates itself. In this case, the determination is made by determining whether the contents of DA23 of the packet signal (P) match its own address.

Further, the signal discriminating means 35 detects the packet signal (P).
is activated when the self-designation determining means 34 determines that the signal is not a self-designating signal. 6. signal (second
seed signal). In this case, the type of the packet signal (P) is determined depending on whether the -broadcast flag BROD29 of the packet signal (P) is 1 or not.

Further, the signal input means 36 is adapted to input the transmitted packet signal (P).

Here, the signal input means 36 receives the packet signal (P
) is determined to be a type 2 signal by the signal determining means 35, that is, when the packet signal (P) is transmitted to all personal computers 3.4.5.6 at once, and the packet signal (P) is determined by the signal determining means 35 to be a type 1 signal, and the packet signal (P) is determined by the self-designating determining means 34 to be a signal specifying itself. It looks like this.

The first response means 37 operates when the input means 36 inputs the packet signal (P) as the first type signal, and generates a response signal indicating that the packet signal (P) has been received. host computer 1 as a sending device
It is supposed to be returned to.

On the other hand, any one of the personal computers 3, 4, 5, 6, for example the personal computer 4, is provided with a second response means (S). The second response means (S) determines that the transmitted packet signal (P) is a type 2 signal by the signal discrimination means 35, and that the packet signal (P) is input by the input means 36. It is activated when
The second response means (S) is configured to return a response signal indicating that it has received the bucket signal (P) to the host computer 1.

Further, 38 to 42 indicate interface circuits including MODEMs (modulators and demodulators).

FIG. 2 also shows the host computer 1, personal computers 3, 4, 5, 6, communication control module 7.
Details of the vicinity of the interface circuits 30 to 33 and the interface circuits 38 to 42 are shown.

In the figure, 42. ．． 43 indicates MODEM, and 44.4
5 indicates a carrier detection circuit, and 46.47 indicates a power supply synchronization circuit. Note that 48.49 indicates a coupling transformer. In addition, in the figure, (B) shows an address setting means for setting its own address.

Next, the operation will be explained based on FIGS. 1 to 7.

However, suppose that the host computer l specifies, for example, the personal computer 5 and transmits a packet signal (P). This state is shown in FIG.

In this case, the communication control modules 30, 31, 32, 33 of all the personal computers 3, 4, 5, 6 examine whether the packet signal (P) is a signal that designates itself. Computer 4 operates as follows.

First, in step S1 in FIG. 4, 5A22 is received in the frame configuration of the packet signal (P), and then,
In step S2, DA23 is received. Thereafter, in step S3, it is determined whether the contents of the DA 23 address field 28 match the own address, but since they do not match, the process proceeds to step S4.

In step S4, during the frame configuration of the packet signal (P), the simultaneous broadcast flag BROD27 of the DA23 is set.
is 1, that is, whether the bucket signal (P) is a signal sent simultaneously to all personal computers 3゜4.5.6, but - it is not a signal sent simultaneously. Therefore, in step S5, the packet signal (P) is not received.

The above-mentioned operation is the same for the other personal computers 3.6. However, the personal computer 5 operates as follows.

That is, in step S3 above, the packet signal (P)
Since it is determined that the signal designates itself, the process advances to step S6. In step S6, during the frame configuration of the packet signal (P), from the CW 24 to the FCC 27
After receiving all of the above, the process advances to step S7. In step S7, an ACK as a response signal is returned, and the reception process of the packet signal (P) is ended.

On the other hand, a state in which the host computer 1 simultaneously transmits a packet signal (P) to all the personal computers 3, 4, 5, and 6 is shown in FIG.

In this case, in step S4 in FIG.
determines that the packet signal (P) is a type 2 signal, that is, a signal sent simultaneously to all personal computers 3.4.5.6.

Thereafter, the second response means (S) provided in the communication control module 31 of the personal computer 4 returns an ACK signal to the host computer 1 indicating that the packet signal <P) has been received. This allows host computer 1
In this case, the packet signal (P) is transmitted to all personal computers 3
．． 4,5°6, it is determined that they were received all at once.

Also, in Fig. 7, the packet signals (P) are being transmitted simultaneously as in Fig. 6, but due to noise on the home bus 2, the packet signals (P) are not received properly. In this case, the second communication control module provided in the communication control module 31 of the personal computer 4
Since the A and CK signals from the response means (S) are not returned, the communication control module 7 of the host computer 1
In the figure, in section α, the packet signal (P) is transmitted again...
- In this case, when the packet signal (P) is received, an ACK signal is sent back to the host computer 1 side.

Note that it is also possible to use a power line instead of the home bus.

〔Effect of the invention〕

As explained above, according to the present invention, when a signal transmitted simultaneously to all receiving devices is received, the second response means is provided for returning a response signal to the transmitting device to the effect that the signal has been received. Even when signals are transmitted to devices all at once, it is possible to confirm whether the signals have been received by the receiving devices, and therefore highly reliable transmission and reception can be expected.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram of the present invention, FIG. 2 is a detailed circuit diagram, and FIG. 3 is a frame configuration diagram of a packet signal.
Fig. 4 is a flow diagram explaining the operation, Figs. 5 to 7 are explanatory diagrams of the operation, Fig. 8 is a circuit diagram of the prior art, Fig. 9 is a detailed circuit diagram, and Fig. 10 is a packet diagram. The frame configuration diagram of the signal, FIGS. 11 and 12, are action explanatory diagrams. 1... Transmitting device (host computer), 3゜4.5.6... Receiving device (personal computer), 35... Signal discrimination means, 37...
...First response means, S...Second response means. Agent Masuo Oone (and 2 others) 1- Host computer 3.4, 5.6-11-Basic computer 35-
-- A No. 8 Gaku IV Lee ++ Figure 3 Q,, CL Ward Ward - [F] t & Dispatch -9-No Ward zuCζ Turn Figure 9 Figure 11

Claims (1)

[Claims] In a transmitting/receiving device consisting of a transmitting device and a plurality of receiving devices that receive signals from the transmitting device, the signal is a type 1 signal transmitted specifying any one receiving device, or all receiving devices a signal discriminating means for determining whether the signal is a type 2 signal transmitted by specifying the signal; a first response means for returning a response signal to the transmitting device when receiving the first type signal; and an arbitrary receiving device. a second type of signal, which is provided in
A transmitting/receiving device comprising: a response means.