JPS5986942A - Controlling system of data communication terminal equipment - Google Patents

Abstract

PURPOSE:To improve a program processing capacity by constituting a titled system so that a circuit control part and a program control part can use alternately a data bus o a circuit corresponding part without exerting influence on transmission and reception of data. CONSTITUTION:A control device 1 contains a program control part 2, a circuit control part 3, circuit corresponding parts 4, 4', a receiving data bus 5 connected to a transmission line, a transmitting data bus 6, address buses 17, 17' and 17'', input data buses 18, 18' and 18'' and output data buses 19, 19' and 19''. Also, it contains a switching circuit 11 of an address bus, a switching circuit 12 of an input data bus, a switching circuit 13 of an output data bus and a switch controlling circuit 14. As for a timer 15, the time corresponding to a signal transfer time between the control part 2 and the circuit corresponding part 4 is set in advance, and it is operated when a transfer of this signal is started, and informs information to the switch controlling circuit 14 after this set time elapses.

Description

Detailed Description of the Invention (1) Technical Field of the Invention As one form of a data communication system, a communication control processing device connected to an information processing device and one device controlling several data communication terminals are used. There is an online system in which a plurality of control devices are connected to a time division multiplex communication transmission line installed in a ring.

The present invention provides a control method for the control device located between a transmission line of a time division multiplex communication system and a plurality of data communication terminals in the above-mentioned online system, etc., and that performs data transmission and reception therebetween and controls related thereto. It is related to.

(2) Prior art and problems Figure 1 is a block diagram showing a conventional control system.
is a control device, 2 is a program control section, 3 is a line control section,
4. 41 is a line correspondence part, 5 is a receive data bus connected to the transmission line, 6 is a send data bus connected to the transmission line, 7 is an address bus, 8 is an input data bus, and 9 is an output data bus. The bus 10.10' is a connection terminal for a data communication terminal.

FIG. 2 is a diagram showing the format of data on the transmission path,
is a frame, FH is a frame header, T S, TS,
, TS, and TS each indicate a time slot. The frame header FH is a binary code consisting of several tens of bits, and is mainly used for synchronizing each frame F. The time slots TS and -TSn are assigned to each data communication terminal (like a line corresponding section), and each time slot contains transmission/reception data consisting of several bits of binary code.

In FIG. 1, the line control unit 3 counts the number of time slots received for each frame of data on the transmission line and sequentially sends the values to the address bus 7. At this time, the received data is also put on the input bus 8 at the same time.

The line correspondence section 4 constantly monitors the value on the address bus 7, and if it matches its own address, it accepts the data on the input bus at that time and sends it to the data communication terminal. Transmission data is also processed in a similar manner. Therefore, the address bus 7, input data bus 8, and output data bus 9 are connected most of the time during a frame of data (
As a result, the line control unit 3 exclusively uses the bus from 'rsh to
FH) exists only during the time period.

Following the timing of data frames on the transmission path,
Line control unit 3 that must send and receive data
Conventionally, such a method has been adopted in order to prevent contention in the use of the data bus between the program controller 2 and the program control unit 2, which operates asynchronously.

The program control unit 2 not only sets the signal line and communication form with the line support unit 4 and controls related thereto, but also performs other processes such as sending out logging information when an accident occurs. As mentioned above, because the available bus time is short,
The disadvantage was that there was often a waiting list and the response time was long. Furthermore, since the processing is divided, there is a drawback that the control program becomes complicated.

(3) Purpose of the Invention In view of the above-mentioned drawbacks of the conventional art, the present invention provides a system that allows the line control unit and the program control unit to be integrated into one unit without affecting the transmission and reception of data.
It is an object of the present invention to improve the processing ability of a program control section by providing a method that can alternately use a data bus between it and a line corresponding section. For example, as described in the claims, a program control section that mainly controls transmission procedures, a line control section that controls transmission and reception of data, and each of a plurality of data communication terminals. A control device that is located between a transmission line of a time division multiplex communication system and a plurality of data communication terminals and performs data transmission and reception and related control, comprising a correspondingly provided line corresponding section, The repetition period of the start of signal transfer between the line control section and the line correspondence section and the repetition period of the start of signal transfer between the program control section and the line correspondence section are The sum of the time required for signal transfer and the time required for signal transfer between the program control section and the line correspondence section is also set in the dog, as well as the end time of signal transfer between the line control section and the line correspondence section. A timer for detecting the end time of signal transfer between the program control section and the line correspondence section is provided, and the timer is used to detect the signal transfer end time between either the line control section or the program control section and the line correspondence section. 0 (5) achieved by a data communication terminal control method characterized by a configuration that enables the other side to use a signal transfer bus with the line corresponding section when the transfer end time is detected. ) Embodiment of the Invention FIG. 3 is a block diagram of an apparatus for realizing an embodiment of the present invention, in which 1 to 10 and 10' are the same as in FIG. 1, 11 is an address bus switch circuit, and 12 is 13 is an input data bus switch circuit, 13 is an output data bus switch circuit, 14 is a switch control circuit, 15.16 is a timer, 17.17', 17'' are address buses, 18.18
', 18'I are input data buses, 19.19', 19''
indicates the output data bus.

The timer 15 is set in advance for a time corresponding to the signal transfer time between the program control section 2 and the line correspondence section 4, and operates at the start of the signal transfer, and after the set time has elapsed, the switch control circuit 14 Notify. The timer 16 is set in advance for a time corresponding to the signal transfer time between the line control section 3 and the line correspondence section 4, and operates at the start of the signal transfer, and after the set time has elapsed, the switch control circuit 14 Notify. The switch control circuit 14 constantly monitors requests from the program control section 2 and the line control section 3 to use the bus with the line corresponding section, and controls the switch circuits 11 to 13 to control the address bus as necessary. or data bus to the program control unit side or the line control unit side.

In FIG. 3, the line control unit 3 transfers the received data for each time slot to the input data bus 1 via the buffer.
At the same time, the number of time slots is counted and the value is placed on the address bus.

At this time, the line control unit 5 tells the switch control circuit i4 to
Issue a pass usage request every time. Upon receiving this, the switch control circuit 14 controls the switch circuits 11 to 13 to switch each node to the line control section side each time, but each time the timer 16 is activated and the preset time elapses. When the time has passed, release the bus.

Therefore, from the time the address and data of one time slot are sent to the line correspondence section 4 until the data of the next time slot is sent.

It becomes possible for the program control section to use the bus.

At this time, if there is a request to use the bus from the program control section 2, the switch fliG control circuit 14 instructs the switch circuit to immediately switch the address bus and data bus to the program control section side, and also the timer 15 Activate. When the timer 15 determines that the signal transfer from the program control section 2 to the line correspondence section 4 has been completed, the switch control circuit 14 releases the address bus and data bus in preparation for the next time slot data. .

By repeating such control, the program control section can receive and pass data to and from the line corresponding section for each time slot, in addition to the timing of the frame header. There is no need to wait for a long time for a vacant space.

The repetition period of starting signal transfer between the line control unit and the line handling unit 4 and the repetition period of starting signal transfer between the program control unit 2 and the line handling unit 4 are determined by the line control unit and the line handling unit, respectively. 4 and the signal transfer time between the program control section 2 and the line correspondence section 4. Therefore, in combination with the operation of the timer, there is a conflict in the use of the node. There's no need to wake up.

The explanation so far has mainly been about the operation in the case of data reception, but the case of transmission is the same as the case of reception except that the direction of data transmission is reversed.

(6) Effects of the Invention As explained in detail above, according to the IIJ control method of the present invention, the program control unit transfers signals to the line corresponding unit for each time slot in each frame of data. Since a bus can be secured, data signals can be transferred from the line control section to the line corresponding section and control signals from the program control section can be transferred within the same frame period.
This has the advantage of simplifying the processing logic of the program control section.

Furthermore, since sufficient time can be secured for the bus between the program control section and the line correspondence section, there is no need to wait for a bus to run, which has the advantage of improving response time.

As a result of these, the processing capacity of the program control section improves, so by performing other processing,
The effects are great, such as improving the performance of the entire device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional control system, FIG. 2 is a diagram showing the format of data on a transmission path, and FIG. 3 is a block diagram of a device implementing an embodiment of the present invention. 1... Control device, 2... Program control section, 3...
- Line control section, 4.4'... Line correspondence section, 5... Reception data bus connected to the transmission line, 6... Transmission data bus connected to the transmission line, 7... address bus,
8... Input data bus, 9... Output data bus, 10.10'... Data communication terminal connection terminal, 1
1... Address bus switch circuit, 12... Input data bus switch circuit, 13... Output data bus switch circuit, 14... Switch control circuit, 15.
16...Timer, 17.17', 17''...Address bus, 18.18', 18''...Input data bus, 19,19', 19''...Output data bus, F...
・Frame, FH...Frame header, TS.

Claims (1)

[Claims] It consists of a program control unit that mainly controls transmission procedures, a line control unit that controls data transmission and reception, and a line support unit that is provided corresponding to each of a plurality of data communication terminals. , a control device that is located between a transmission path of a time division multiplex communication system and a plurality of data communication terminals and performs data transmission and reception and related control,
The repetition period of the start of signal transfer between the line control section and the line correspondence section and the repetition period of the start of signal transfer between the program control section and the line correspondence section are set as the repetition period of the start of signal transfer between the line control section and the line correspondence section. and the time required for signal transfer between the program control section and the line correspondence section. A timer for detecting the end time of signal transfer between the control section and the line correspondence section is provided, and the timer detects the end time of signal transfer between either the line control section or the program control section and the line correspondence section. 1. A data communication terminal control system, characterized in that, when detected, the other side is configured to use a signal transfer bus with a line corresponding section.