JPS5884556A - Loop type data transmission system - Google Patents

Abstract

PURPOSE:To transfer the same information to a great number of devices with one frame at the same time, by inserting the multiple address flag to a transmission frame, in a loop type data transmission system, and replacing a transmission address one after another at each transmitter performing multiple address communication. CONSTITUTION:A data format of a loop data transmission system consists of a transmission address SA, a transmitted address DA, a data, a code SI representing whether or not the signal is a multiple address frame, and a reception confirming word ACK, and when this data is received at an upper-order station, the multiple address frame is reproduced at a data reproduction circuit 2 and a multiple address frame detection circuit 4 through a code converting circuit 1, informed to a transmitted address insertion circuit 7, the transmission address SA is referenced and an address designation signal is outputted to a storage circuit 8. The circuit 7 monitors the data train of a one frame delay circuit 6 and when the address DA is sought, the transmission address set to the circuit 8 is outputted to a gate 9. In detecting the frame for the station itself at a detection circuit 5, the data is inputted to the circuit.

Description

Detailed Description of the Invention (1) Technical field to which the invention pertains The present invention relates to a method for transmitting information between arbitrary data transmitting and receiving devices by connecting nine data transmitting and receiving devices in a loop to each of a plurality of data terminal stations. The present invention relates to a loop data transmission method.

(2) Prior Art A data transmission/reception system in a conventional loop data transmission system will be explained. As shown in Figure 1, the data transmission system is connected in a loop, nl,"2,...
, and nB are nine data transmitting/receiving devices provided at the data terminal station, and Dl, D2, . . . , and D5 are information processing devices attached to the respective data transmitting/receiving devices. A data format shown in FIG. 2 exists on the transmission path, and data is transmitted between each station. The data format is a rounded 7 frame synchronization word by which frame synchronization is performed.
NO, a data source address S which indicates the sending station of the data, a data destination address D which indicates the receiving station of the data, an information field D which carries the transmission data, and a reception confirmation of the information field DATA. It consists of a reception confirmation word ON indicating the presence or absence of a message, and an error confirmation word aS which performs a verification of the entire frame.

Control of data transmission is performed as follows. One station in the loop (in Fig. 1, a data terminal station equipped with data transmitting/receiving device n) becomes a system control station, and #
IE2 transmits the data in the 7-frame configuration shown in the diagram, and each other station transmits it to the lower station with a delay of exactly 1 frame and 15 minutes.
The delay on the transmission path is corrected by the n1 station, which is a system control station, and control is performed so that the number of data terminal stations plus one frame exists on the transmission path. When each station receives an empty frame, if it has no data, it sets the address of the lower station in the data source address 8m and the data destination address Dm, and sends the empty frame again ( (Hereafter, this will be referred to as "lower station polling.") On the other hand, from the perspective of the lower station, if the data source address Sm and data destination address Dm of the frame received from the upper station are both the own station, the frame is one in which the own station may send data. (Hereafter, this will be referred to as “
(referred to as "local polling").

If the data source address, S B, is another station, and the data destination address, D, is your own station, data is sent from the station indicated by the data source address, A, to your own station. At this time, if the result of the IIa test is negative, the data is received, and if the frame is not a data reception confirmation frame, the reception confirmation word OK is set, and the data source address 8 is set. and the data destination address Dm are exchanged and transmitted as a data reception confirmation frame. If the received frame is a data reception confirmation frame for the local station, it is determined that the data from the local station has been transmitted correctly and is good. If the local station has data, it moves on to the next data transmission, and if there is no data, it polls the lower station. I do.

Furthermore, if the data source address Bm and the data destination address Dm are both other stations, the data is transmitted to the lower station as is with only a delay of 17 frames. False) If the test result is not required, it is considered as local station polling, and if the local station has data, it transmits that data, and if there is no data, lower station polling is performed.
If the cycled frame is not a data reception confirmation frame,
Transmit the same data again and return the specified frequency until the data is received by the receiving station. In this way, data errors 9 or data loss due to transmission errors are prevented.

However, according to this method, if the data destination address is fixed at one location, and a certain transmitting station attempts to transmit data to several broadcast stations, frames for the number of broadcast stations are required. , which has the disadvantage of significantly reducing the transmission efficiency of loop data transmission.

(3) Purpose of the Invention The purpose of the present invention is to transmit data by adding a code to the frame to indicate whether the frame is a single information frame or a broadcast frame, and to transmit data to many stations at the same time with one frame. It is possible to solve the above-mentioned drawbacks and provide a loop-like data transmission system by controlling the data so that the data can be transmitted.

(4) Summary of the Invention The present invention provides a data processing system provided at each of a plurality of data terminal stations.
The data transmitting/receiving devices are connected in a loop, and each data terminal station is delayed by a time corresponding to one frame unit, thereby transmitting/receiving data and confirming responses between the data terminal stations corresponding to the number of terminals. In the second loop data transmission method,
A means for transmitting a code indicating whether a transmitted frame is a broadcast frame or not to each data transmitting/receiving device together with data, a means for identifying whether a received frame is a broadcast frame, and a means for identifying a source address in advance. A storage circuit in which a transmission destination address is stored correspondingly, and a means for inserting a corresponding address into a data transmission destination address area according to the transmission destination address are provided, so that a received frame of data is automatically transmitted as a broadcast frame. 1 if it is a 9-signal frame for the station.
It is characterized in that the transmission destination address stored in the storage circuit is inserted into the data transmission destination address area at the same time as data is fetched into the kKa own station.

(5) Examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 shows the data format of the embodiment of the present invention. In FIG. 5, each symbol corresponds to each symbol in FIG. 2. A characteristic structure of the data format of this embodiment is that a broadcast code 8I indicating whether or not the frame is a broadcast frame is inserted between the information field D mutem and the reception confirmation word AOK. be. Further, each data transmitting/receiving device of each data terminal station has a table for broadcast communication. As shown in Fig. 4, if the data transmitting/receiving device is made up of 5 stations, IF: A-1, and 319 MU stations.
When broadcasting to a station, the 00 station is B% lj! When performing broadcast communication, each data transmitting/receiving device stores in a random access memory (hereinafter referred to as "RAM") a destination address sum corresponding to a source address 8m as shown in Table 1.

Table 1 Operation line of a data transmitting station. When your own station is polled and tries to transmit its own data, if that frame is a broadcast frame, set the broadcast code 8x in the frame and send it. This is a point that differs from the conventional technology. The operation of the data receiving station is exactly the same as described in the prior art section when the broadcast 7 lag is not set, so the operation when the broadcast flag is set will be explained below. I will explain next. That is, we will describe how one piece of data is correctly transmitted to several destinations one after another by transmitting a frame with a broadcast code of 8 (hereinafter referred to as a "broadcast frame").

A data transmitting/receiving device that receives a broadcast frame first checks whether the data is for its own station, and if it is not for its own station, it transmits it to the lower station as is with a one-frame delay. On the other hand, when the data is for the local station, the data is loaded, and the corresponding address is set in the data transmission address Dm according to the 8A-D direct conversion table stored in advance in the RAM, and transmitted to the lower station. Setting this address also serves as a substitute for the reception confirmation word aX, and by setting the corresponding address one after another in each data transmitting/receiving device, broadcast data is transferred. At this time, the data transmitting/receiving device transmitting the broadcast data receives the friend frame with its own station specified in both the data source address 8m and the data destination address DA&. When the broadcast flag is not set, it indicates that this frame is simply a local station polling frame, but when the broadcast flag is set, it indicates that this frame is a local station polling frame and that it is transmitted first. It also shows that the 9 data was correctly received by all stations receiving the broadcast data.

Next, a method of transmitting a broadcast frame, controlling data acquisition by receiving a broadcast frame, and adding a destination address in an NK according to the present invention will be described with reference to FIG.

FIG. 5 is a block diagram of a data transmitting/receiving device according to an embodiment of the present invention. In FIG. 5, the IFi code conversion circuit converts the code of data received from the upper station. The output of this code conversion circuit 1 is connected to each of the data reproducing circuit 2 and timing extracting circuit 3. The output of this timing extraction circuit 3 is led to a data reproducing circuit 11, and the output of this data reproducing circuit 2 is connected to a broadcast frame detection circuit 4, and for the own station, a frame detection circuit 5 and a 17-frame delay circuit 6. be done.

The detection output of this broadcast 7 frame detection system 4 is connected to each of the destination address insertion circuit 7 and the storage circuit 8 in which the destination address is stored.

The output of this storage circuit 80 is guided to the destination address insertion circuit 7, and the output of the insertion circuit 7 is connected to the input of the OR gate 90. It is connected to the output destination address insertion circuit 7 of the one-frame delay polishing circuit 6 and to the input of the OR gate 9.

In addition, the one frame slow grinding circuit 6 is as follows. Information processing device interface 10. is connected to the information processing device via. This interface 10 has frame detection for the local station.
The detection output of line 5 is connected. Furthermore, interface 1
0 is connected to the broadcast 7 lag insertion circuit 11. The output of the broadcast flag insertion circuit 11 of Jin is the frame synchronization creation circuit, 1
2 and the input of the OR gate 9. The output of this OR gate 9 is connected to one input of an OR gate 13 and to the input of a WA) detection bit creation path 14. The output of the error detection bit generation circuit 14 is connected to the other input of the OR gate 13. The output of the OR gate 130 is connected to the lower station via the code conversion circuit 15.

With such a configuration, data received from the upper station passes through the code conversion circuit 1 and is input to the data reproduction circuit 2 and the timing extraction circuit 3. The nine data extracted by the extraction circuit 3 and reproduced by the one reproduction tie set are input to the broadcast frame detection circuit 4, the frame detection circuit 5 for the own station, and the 17-frame delay circuit 6. When the broadcast frame detection circuit 4 detects the broadcast frame 7, it notifies the transmission destination address insertion circuit 7 and outputs an address designation signal to the storage circuit 8 with reference to the transmission destination address 8A. 9. Destination address insertion circuit 7 is one frame delay polishing circuit 6
After monitoring the data string and searching for the destination address, the destination address preset in the memory circuit 8 is taken out and output to the IHC (or game).

Well, when the local station frame detection circuit 5 detects the local station frame, the data from the one frame delay circuit 6 is sent to the information section II.
On the other hand, if the data imported from this interface 10 is broadcast data,
- Notify the broadcast flag insertion circuit 11 and receive the notification.The broadcast flag is transmitted by the broadcast flag insertion circuit 11 to the code conversion circuit 15 via the OR gate 9 and the OR gate 13, and is then transmitted to the lower station. Ru.

The above example shows an example in which the number of data terminal stations is five, but this number is not limited to five.

(6) Detailed Description of the Invention As described above, the present invention inserts a broadcast flag into a transmission frame, and by sequentially changing the destination address in each transmission device that performs broadcast communication, The same information can be transferred to a large number of data transmitting/receiving devices at the same time, which has the effect of increasing data transmission efficiency.

In addition, in this method, if it is necessary to dynamically change the destination of broadcast communication, broadcast communication is performed using a normal frame, and each round data transmitter/receiver sends RA to the corresponding station in advance.
There is also the advantage that sending an instruction to change the contents of M can be sufficient to deal with the problem.

[Brief explanation of the drawing]

FIG. 1 is a general system configuration diagram in which a loop data transmission method is performed. FIG. 92 is a diagram showing the data format of a conventional column transmission signal. FIG. 5 is a diagram showing a data format of an embodiment of the present invention. Figure 4 shows the present invention - Actual II#A? System configuration diagram of l. FIG. 5 is a block diagram of a data transmitting/receiving device according to the present invention - an actual 1/IA example. DESCRIPTION OF SYMBOLS 1... Code conversion circuit, 2... Data regeneration circuit, 3...
... Timing extraction circuit, 4... Broadcast frame detection circuit, 5... Frame detection circuit for own station, 6... 1 frame delay [1111, 7-... Destination address insertion circuit, 8... . . . Memory circuit, 9 . . .
OR gate, 14... Erroneous detection bit creation circuit, 15
...1 code conversion. Patent Applicant: NEC Co., Ltd., Attorney-at-Law, Patent Attorney, Attorney -°j・, Town/Arts Figure 2 Figure 3

Claims (1)

[Claims] (1) Data transmitting/receiving devices provided at each of a plurality of data terminal stations are connected in a loop, and each of the data terminal stations delays the data by the time equivalent to one frame unit of data. In a loop data transmission method that transmits and receives nine data and confirms responses between each other depending on the number of terminal stations, each data transmitting and receiving device is provided with a code indicating whether or not the transmitted frame is a broadcast frame along with the data and evening. means for transmitting, means for identifying whether or not a received frame is a broadcast 7 frame, a storage circuit in which a destination address is stored in advance in correspondence with a source address, and means for inserting the address to be sent into the data destination address area, and at the same time when the received data frame is a broadcast frame or a received frame directed to the local station, the data is read into the social station at the same time. A loop data transmission method characterized in that a destination address stored in the memory circuit is inserted into a data destination address area.