JPS60125034A - Data transmission system - Google Patents

Abstract

PURPOSE:To reduce the transmission of ineffective data and to receive normal data speedily by resending data information on unreceivable data from the data transmission part at a transmitter side on interruption basis. CONSTITUTION:A figure (a) shows that a transmitter 14 sends cyclic information data contents A to a cyclic data reception part 11 and cyclic information data B is returned from the cyclic data transmission part 13 of a receiver 15. If (d)- bit information data of the contents A become abnormal to cause a failure in reception, a data monitoring and detecting part 12 initiates an interruption to the cyclic data transmission part 13 to interrupt d' in information data contents B in a figure (b). This d' is received by the transmitter 14 and the (d)-bit information data is resent by the transmitter 14 to the receiver 15.

Description

Detailed Description of the Invention +8) Technical Field of the Invention □ The present invention relates to a data transmission system for transmitting cyclic information data between bidirectional transmitting and receiving devices connected by a duplex transmission line.

Background of the Technology Conventionally, data transmission systems have been used between a center computer and a front computer, or between a front computer and a data terminal device, or between a center computer and a front computer in a data transmission system.

Data transmission paths for transmitting information data between data terminal devices are performed using public communication lines or specific communication lines.

Data transmission between these devices involves transmitting information data from a data transmitting section on the transmitting device side to a data receiving section on the data receiving device side via a data transmission path.

The data receiving unit on the receiving device side receives information data such as confirmation response from the data transmitting unit on the receiving device side.

The data is returned to the data receiving unit on the transmitting device side via the data transmission path. In order to be able to send and receive this information data from both directions at the same time, a bidirectional data transmission system with two data transmission paths and a full duplex transmission system is adopted.
Data transmission systems that require high-quality data transmission because there is a risk that data errors will occur with a certain probability due to the effects of noise, etc. on the 2 communication lines when transmitting data via communication lines. In this system, a so-called cyclic transmission method is adopted in which information data of a specified number of bits is repeatedly transmitted at a fixed period, and errors are automatically checked and updated.

(C) Prior Art and Problems A conventional data transmission system between this type of transmitting and receiving apparatus will be described below. FIG. 1 shows a configuration diagram of a data transmission system that transmits cyclic information data using a conventional full-duplex transmission method. 1 indicates a transmitting device that cyclically transmits information data, and the transmission path 2 The information data is transmitted to the receiving device 3 via. In the receiving device 3, the data receiving section 4 receives the transmitted cyclic information data. Further, the receiving device 3 cyclically sends information data such as an acknowledgment back to the transmitting device 1 via the transmission path 5, and the sending device 1 receives the returned cyclic information data at the data receiving section 6. .

FIG. 2 shows a diagram of the contents of cyclic information data transmission in the configuration diagram of FIG. 1, and the same objects are indicated by the same symbols throughout the diagram. The cyclic information data contents A transmitted from the transmitting device 1 to the receiving device 3 are arranged in the order of transmission (B −+
l) -f-g-~).

The cyclic information data contents B returned from the receiving device 3 to the transmitting device 1 are transmitted in the order of transmission (, fll-T2) to (
6)→(7)−～). This information data content A or information data content B is set by the number of bits for a specified address, and is repeatedly transmitted from the transmitting device 1 at a fixed period,
The information data received by the receiving device 3 is automatically checked for errors and updated.

In this Φ conventional data transmission system, if.

When unreceivable data occurs in the address bit of cyclic information data due to a failure caused by some reason (1) For example, suppose this is the d bit of information data content A in FIG.

Since the data receiving unit 4 of the receiving device 3 cannot receive the d-bit information data, this d-bit data is discarded.
Until the data of the corresponding d bit in the next cycle is received.
This method has the drawback that only B x C bit data is received, and the reception processing of data after the corresponding d bits is not performed, resulting in a delay of at least one cycle of information data processing.

(d) Purpose of the Invention The object of the present invention is to solve the conventional disadvantage of delay in reception processing due to the inability to receive information data.

(el) Structure of the Invention The above object has a redundant transmission line for transmitting information data; A monitoring circuit that monitors information data, detects unreceivable information data, and sends out an interrupt signal; A full-duplex data transmission system for transmitting cyclic information data between the transmitting and receiving devices, comprising a data transmitting unit for returning a transmission request signal on the transmitting device side and a receiving device side, respectively. Cyclic information data is transmitted from the data transmitting unit, received by the data receiving unit on the receiving device side, and when the monitoring circuit detects the unreceivable data among the received information data, the data transmitting unit An interrupt signal is sent to the data transmitter, and a retransmission request signal is sent back from the data transmitter to the data receiver on the transmitter side.

This is achieved by the present invention, which is configured to interrupt and retransmit the corresponding information data of the unreceivable data from the data transmitting section of the transmitting device.

In other words, cyclic information data is transmitted from the transmitter side via a duplex transmission path, received by the receiver side, and cyclic information data such as an acknowledgment is returned from the receiver side to the transmitter side. In a duplex data transmission system, when the monitoring circuit on the receiving device side detects unreceivable data among the cyclic information data received by the receiving device.

An interrupt signal specifying the address of the relevant information data is applied to the cyclic information data of the data transmitter.

By configuring the information data to be sent back to the transmitting device and retransmitting the corresponding information data, it is possible to reduce the transmission of invalid data and quickly receive normal data.

The present invention provides a data transmission method that can eliminate processing delays in information data.

(f) Example of the Invention An example of the present invention will be described below. FIG. 3 shows a block diagram of the interrupt signal processing circuit configuration of the present invention, in which 11 is a cyclic data receiving section, 12 is a data monitoring and detecting section,
13 indicates a cyclic data transmitter. The cyclic data receiving unit 11 is a circuit that receives cyclic information data, and the data monitoring and detection unit 12 checks whether the received cyclic information data is normal or abnormal, and if it is abnormal, specifies the address of the abnormal data. The cyclic data transmitter 13, which is a circuit that sends an interrupt signal to the cyclic data transmitter 13, returns cyclic information data to be transmitted from the data processing side (not shown) to the transmitter side, and also monitors the data. This circuit transmits a retransmission request signal including the address of the abnormal data in response to an interrupt signal from the detection unit 12. Since this circuit configuration is similarly provided on the transmitting device side and the receiving device side, the interrupt function will be explained using FIG. 3 as the receiving device side.

The cyclic data receiving unit 11 receives cyclic information data from the transmitter side, the data monitoring and detection unit 12 checks the received data, and if the information data is normal, the data monitoring and detection unit 12 sends the data to the data processing side (Fig. (not shown). If unreceivable data occurs in the address bits of the cyclic information data due to a failure caused by some reason, the data monitoring detection unit 12 detects the abnormality and sends the address of the abnormal data to the specified address. The input signal is sent to the cyclic data transmitter 13. Also.

Sending of the information data after the abnormal data to the data processing side is stopped. The cyclic data transmitter 13 responds to the interrupt signal input from the data monitoring detector 12 and transmits a retransmission request signal for normal cyclic information data and abnormal data to the transmitter side.

FIG. 4 shows a diagram of the contents of cyclic information data transmission in the configuration according to the present invention. 14 is a transmitting device.

15 indicates a receiving device. FIG. 4 ta+ shows the cyclic information data content A (a-b-f-g-
) is transmitted to the cyclic data receiving section 11, and the cyclic information data content B (<1l-(21-(6)-) is transmitted from the cyclic data transmitting section 13 of the receiving device 15.
(7)--) are returned. Among the cyclic information data contents, if the dbi-node information data becomes abnormal and becomes unreceivable data, the data monitoring detection section 12 issues an interrupt to the cyclic data transmission section 13, as shown in Fig. 4. ) Cyclic information data content B'(5) → (6) ~ (9) → d゛→Sequence <, d
゛ is interrupted. This d' is received by the transmitting device 14, and d
The bit information data is retransmitted from the transmitting device 14 to the receiving device 15 again. The cyclic information data content to be retransmitted is the information data content A'' in FIG. 4(C).
The transfer order is (k-1~〇-d-e~), and from bit 0 onward, cyclic transmission is interrupted with retransmission information data from d-+6~, and all specified bits have been transmitted. A retransmission action was previously taken to eliminate the reception processing delay.

(g) As described in detail of the invention, cyclic information data is transmitted from the transmitting device side via a duplex transmission path, received by the receiving device side, and cyclic information such as an acknowledgment is transmitted from the receiving device side. In a full-duplex data transmission system that sends data back to the transmitting device.

When the monitoring circuit of the receiving device detects unreceivable data among the cyclic information data received by the receiving device, the address of the corresponding information data is specified in the cyclic information data of the data transmitter. By using the circuit of the present invention configured to apply an error signal, send it back to the transmitter side, and retransmit the corresponding information data, the transmission of invalid data can be reduced.

This has the effect of allowing normal data to be received quickly and eliminating delays in processing information data.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a data transmission system that transmits cyclic information data using the conventional all-two-channel transmission method, Figure 2 is a diagram of the contents of cyclic information data transmission in the conventional configuration diagram, and Figure 3 is A block diagram of an interrupt signal processing configuration according to the present invention, and FIGS. 4A to 4C show a cyclic information data content diagram according to the present invention. In the drawing, 11 is a cyclic data receiving section. 12 is a data monitoring detection unit, 13 is a cyclic data transmission unit, 14 is a transmitting device, 15 is a receiving device, A, A',
^'' and B, B', B'' respectively indicate cyclic information data contents.

Claims (1)

[Scope of Claims] A data receiving unit having a duplex transmission line for transmitting information data, receiving cyclic information data input from the duplex transmission line, and monitoring information data input to the data reception unit. and a monitoring circuit that detects unreceivable information data and sends out a 9 interrupt signal; and a monitoring circuit that sends cyclic information data to the redundant transmission line, and generates a retransmission request request using the interrupt signal from the monitoring circuit. A data transmitter for returning the signal is provided on the transmitting device side and the receiving device side, respectively. A full-duplex data transmission system for transmitting cyclic information data between the transmitting and receiving devices. Cyclic information data is transmitted from the data transmitting unit on the transmitting device side, received by the data receiving unit on the receiving device side, and when the monitoring circuit detects the unreceivable data among the received information data. 3 Sends an interrupt signal to the data transmitting section, returns a retransmission request signal from the data transmitting section to the data receiving section on the transmitting device side, and causes the data transmitting section on the transmitting device side to receive the retransmission request signal. A data transmission method characterized by being configured to interrupt and retransmit corresponding information data of invalid data.