JPS59229952A - Signal transmitting method - Google Patents

Abstract

PURPOSE:To reduce the load on a transmitter by providing a master device capable of transmission and reception, and generating a check sum code on the basis of a reception signal and transmitting it to a receiver. CONSTITUTION:Numbers of transmitters T1-Tn and receivers R1-Rn are connected to common transmission lines l1 and l2, and the master device M capable of transmissin and reception is connected. When some of the transmitters, e.g. T1 sends a bit-serial signal to the transmission lines l1 and l2, the address-specified receiver T2 fetches the signal in a specific register of its control circuit. The master device M, on the other hand, fetches it in its control circuit 2 and calculates the check sum code to send out a serial signal of the receive signal to the transmission lines l1 and l2. The receiver R2 receives the signal to perform a sum check, and validates the signal fetched in the register when normal. A specific resending request signal is generated when abnormal.

Description

[Detailed Description of the Invention] The present invention relates to a time-division trust transmission method, which will be described in detail in Section 4-
In other words, it is possible to propose a signal transmission method that improves the reliability of the transmitted signal by performing a sum check.

When transmitting signals between a plurality of devices, various data checks are performed to avoid troubles such as data loss during transmission. This data check is performed using advanced checks such as sum check and CRC when the transmitter and receiver have an I:I correspondence, but if multiple transmitters and receivers are connected by party line, In reality, when signal transmission is performed in a time-division manner, only low-level checks such as parity checks are performed for various reasons.

The non-explosion J was made in view of such circumstances,
The purpose of the present invention is to provide a signal transmission method that can check the reliability of signals by performing a sum check on signal transmission between a plurality of transmitters and receivers connected through a party line without imposing a burden on the transmitter. 〇The signal transmission method related to unexploded Ff4VC is a method of time-divisionally transmitting signals between multiple transmitters and receivers connected to a common line, in which a master device capable of transmitting and receiving is provided, and the master device The present invention is characterized in that a transmitter receives a transmission value 8 sent to a specific receiver, generates a checksum code based on this received signal, and transmits all the checksum codes to the receiver.

The present invention will be specifically explained below. FIG. 1 is a block diagram schematically showing the configuration of a signal transmission system to which the present invention is applied.
, , T2...Tn and receivers R1, R2...R
A master device M, which is capable of both transmitting and receiving signals, is connected.

FIG. 2 is a block diagram showing the circuit configuration of the master device M. The input interface l for inputting signals to be transmitted from all external devices (not shown) and for emitting response signals to the external devices is connected to the control circuit 1i32, which is the control body of the master device M. The control circuit 2 processes signals input from an external device into a form suitable for transmission, and sends the signals through the transmission/reception circuit 3 to the transmission line 4°I! 2 and another transmitter T1. T,・
...T receives the signal sent to specific receivers R,, R3...Rn via the transmitting/receiving circuit 3, processes this received signal for checksum, and transmits it to the corresponding receiver. do. In addition, 4 is a format setting circuit for specifying the format of the transmission signal, 5 is a synchronization clock circuit that generates a tally clock for synchronizing the entire system, and FIG. 3 shows the configuration of the transmitter. 7 ace 11
．． , the control circuit 1tR12, the transmission circuit 13,
The control circuit @12 processes all signals inputted from an external device (not shown) through the input interface 11 into a set format (the format is common to the entire system). Transmission line I! via transmitter @13! Send to 1+7?2. This transmission signal vctri is attached with a code that specifies all the receivers that are to receive it, and in addition to the corresponding receivers effectively receiving this signal, the master device M also receives this signal for all transmission and reception times 1i! It is stored in the control circuit 2 via f15B'i.

The configuration of the receiver is as shown in Figure 4, with transmission line 1
．． ．． Receiving circuit 23 and control circuit 22 connected to 12
, an output interface 21 with an external device, and a format setting circuit 24. The control circuit 22 performs all processing such as decoding the received signal, sends it to an external device via the output interface 21, and performs a sum check as described later.

Note that a device having transmitting and receiving functions may be connected outside the master device M.

The present invention is implemented in the newly constructed system as follows. That is, it is assumed that some transmitter, for example T□, sends out a bit serial signal in the format shown in FIG. 5(a). The signal emitted from this transmitter T□ contains information specifying a fixed destination (for example, receiver R2).

When such a signal is sent to the transmission line 1r+'12,
The receiver R2tri takes in the data into a predetermined register of the control circuit 220 via its receiving circuit 23.

On the other hand, the master device also takes this into the control circuit 2 via the transmitter/receiver circuit 3. Then, all checksum codes are calculated for this received signal, and a signal consisting of a series of received signals and checksum codes is sent to the transmission line /I'112 via the transmitter/receiver circuit 3, as shown in FIG. 5(b)K. Then, the receivers R and Jt receive this signal and store it in another register in the control circuit f622. Then, the control circuit 22 performs a complete sum check on the received signals, and if it is determined to be normal, it validates the signal previously stored in the register and executes the corresponding process. On the other hand, if the result of the sum check is abnormal, the control circuit 22 issues a predetermined retransmission request signal, and in response, the transmitter TI retransmits the entire signal. The control circuit 22 performs the control circuit 22 for a predetermined number of times.
If there is a Nick abnormality, a predetermined alarm signal is sent to all external devices.
It also emits to the attached circuit.

On the other hand, when the master device M itself transmits all the signals, it calculates a checksum code for the signal itself, adds it to the signal, sends it to the specified receiver, and sends it to the transmission line l! , ,
22. This results in a sum check of all transmitted signals.

In the case of the method of the present invention as described above, each transmitter can perform all the sum checks without imposing any burden for the sum check, and the control circuit 12 can perform more important work or work that requires high speed. It becomes possible to The burden on master device M increases accordingly, but master device M
If ' is used for transmission related to the external bag @ where the frequency of occurrence of the signal to be transmitted is low, the system as a whole can be operated rationally.

As described above, in the case of the uninvented method, signal transmission with highly improved reliability can be realized with a relatively simple configuration by means of the sum check.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic diagram of a signal transmission system to which the present invention is applied, Fig. 2 is a block diagram showing the circuit configuration of a master device, Fig. 8 is a block diagram showing the circuit configuration of a transmitter, and Fig. 4 5 is a block diagram showing the circuit configuration of the receiver, and FIG. 5 is a format diagram of the transmission signal. M...Master device 'r1. T2...Tn...
Transmitters R,, R2...1. ...Receiver patent applicant Noboru Kono, agent of Tsubaki Chain Co., Ltd., patent attorney Figure 3! Figure 5 Procedures Amendment (Spontaneous) August 5, 1982 2 Title of the invention Signal transmission method 3 Relationship to the case of the person making the amendment Address of patent applicant 4-17-88 Tsurumi, Tsurumi-ku, Osaka City Name (335) Tsubaki Chain Co., Ltd. Representative Tomo Utsumi - Da 1 generation! How to understand the "detailed description of the invention" in the person's specification 2: [
So, the ρ minute Ister unit M... can be operated rationally. ] will be deleted.

Claims (1)

[Claims] 1. In a method of time-divisionally transmitting signals between transmitters and receivers connected to a common line, a master device capable of transmitting and receiving is provided, and the master device is used to enable other transmitters to receive specific signals. Receive all the transmitted signals sent to the device 1-1 Create a checksum code based on this received signal and send the checksum code to the NFJ recording device.
code transmission method.