JPH01245733A - Time division multiplex transmission system - Google Patents

Abstract

PURPOSE:To improve the response with respect to an interruption request by outputting an interrupt request signal destroying forcibly a return signal from a terminal equipment freely, stopping the return of the data to the terminal equipment during return when the destruction of the return signal is detected by a central control unit and receiving the interruption request. CONSTITUTION:While a terminal equipment 2 of a channel CH1 returns a return signal Vb in the data transmission mode, when the terminal equipment 2 of a channel CH2 sends an interrupt request signal Vi to destroy the data during returning to return emergent data to a central control unit 1, the central control unit 1 detects it that the data during return is destroyed to invert the polarity of the transmission signal Vs. The terminal equipment 2 of the CH2 detects the polarity inversion of the signal Vs to intermit the return of data, and the terminal equipment 2 of the CH1 detects the polarity inversion of the signal Vs to stop the transmission of the signal Vi to be returned to the operation of the normal polling mode. The central control unit 1 applies the polling of the interruption mode to specify the interruption request generating terminal equipment 2, and the transmission signal Vs accessing the interruption request terminal equipment 2 is sent in the normal polling mode to receive the return signal Vb.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a time division multiplex transmission system in which a central control unit accesses terminal equipment and transmits data in a time division multiplex manner.

[Prior Art] Conventionally, this type of time-division multiplex transmission system connects a central control unit and a plurality of terminals with a pair of signal lines, and accesses each terminal from the central control unit to time-divide data. Multiplex transmission is possible. FIG. 1 shows a schematic configuration of a data transmission system using a time division multiplex transmission method according to the present invention, in which a central control device 1, a plurality of monitoring terminals 2 and a control terminal 3 are connected via a pair of signal lines 3. The central controller 1 transmits an address data signal for accessing each terminal 2 and a transmission data signal to be transmitted to each terminal 2, and determines the response period for data sent back from each terminal 2. It is set.

Figure 2 shows a signal 7 that transmits data in packets using a variable length method.
Figure 2 (,) shows the load on,
The central controller 1 transmits short data such as off control data, and the terminal 2 returns short data such as load or operation switch monitoring data. Long data such as display data is transmitted from the central controller 1 to the terminal device 2.
LONG also returns the same long data.
LONG ACK7 ohmat, Figure 2(c) is,
A LONG/5HORTACK7 format is shown in which long data is transmitted from the central controller 1 and short data is returned from the terminal 2. In addition, in FIG. 2(a),
SL, SO are synchronous pulse signals indicating the start of transmission, MO, M
1 is a mode data signal, DA is a partner address data signal, CNTL is a control data signal, C8O is a checksum data signal, WT is a reply waiting period, El and E2 are end pulse signal reply periods, and ST is a rest period. In addition, in FIGS. 2(b) and (c), SA is a self-address data signal, DC is a byte counter number d indicating the length of transmission data, DATA is a transmission data signal, C6I is a checksum data signal, and DUMMY is a The gummy signal and M2 are reply mode signals, and other symbols are the same as in FIG. 2 (,).

By the way, in such a conventional example, if the terminal device 2 is accessed by interrupt processing and urgent data transmission is to be performed quickly, the terminal device 2 is The central controller 1 generates an interrupt request signal from the controller 2.
Then, the presence or absence of this interrupt request signal is constantly checked, and when an interrupt request occurs, the terminal device 2 is searched, the specified interrupt request generating terminal device 2 is accessed, and the predetermined 7
Data was transmitted automatically.

[Problem to be Solved by the Invention 1] However, in the above-mentioned conventional example, while the central control unit 1 accesses a certain terminal 2 and time-division multiplex transmits one packet of data, the signal transmission is This means that the accessed terminal 2 has exclusive access to the L
G/L ON G A CK7 Ohmatsu, LON
When transmitting a large amount of data at once using G/5HORTACK7 automatic transmission, the synchronization pulse signal S1. S
The problem is that as O occurs less frequently (that is, the interval between occurrences becomes longer), the waiting time from when an interrupt request occurs to when the interrupt request is accepted becomes longer, which may impede the transmission of emergency data. was there.

The present invention has been made in view of the above points, and its purpose is to improve responsiveness to detailed requests even when long data is being transmitted, and to improve transmission of emergency data. The object of the present invention is to provide a time division multiplex transmission system that does not cause any problems.

[Means for Solving the Problems] The time division multiplex transmission system according to claim 1 of the present invention connects a central control device and a plurality of terminal devices with a pair of signal lines, and allows each terminal device to be accessed from the central control device. data is time-division multiplexed, and an interrupt request signal consisting of a signal that forcibly destroys the reply signal during the reply period during which data is sent back to the central control unit can be freely output from the terminal, and the central control unit When a destruction of the reply signal is detected, the terminal device that is replying is notified to that effect, and the data return is stopped and the interrupt request is accepted.

Further, in the time division multiplexing transmission system of claim 2, when a central control device accesses a terminal device and causes the data to be sent back, if there is an input request from the upper control device, the data is returned to the terminal device. The system transmits a stop command to stop returning data.

Furthermore, the time division multiplex transmission system of claim 3 divides the data to be transmitted from the central control unit to the terminal equipment into fixed bits and transmits the data, and also divides the data between data transmission signals that transmit fixed byte length data. When an interrupt request is received from a terminal during the interrupt acceptance period set by the interrupt gate, data transmission is interrupted, the interrupt requesting terminal is searched, and the interrupt requesting terminal is accessed. It is designed to receive a reply signal from an interrupt request terminal.

Furthermore, the time division multiplex transmission system according to claim 4 is the time division multiplex transmission method according to claim 3, in which the fact that data transmission has been interrupted is transmitted from the central control unit to the terminal device that is currently transmitting data.

[Function 1] The present invention is configured as described above, and in the first aspect, even when long data is being returned from the terminal to the central control unit, one packet of data is transmitted. Interrupt requests can be accepted immediately without waiting for the end of the process, and responsiveness to interrupt requests can be improved, and there is no problem in transmitting emergency data.

Further, in the second aspect, when an interrupt input is received from the host control device to the central control device, even if data is being returned from the terminal device, the data return is stopped and the interrupt processing is performed. Therefore, responsiveness to interrupt requests can be improved, and there is no problem in transmitting emergency data.

Furthermore, in the third aspect of the present invention, long data is divided into fixed (pi)N pieces of data and transmitted,
Interrupt gates are provided between divided data and the period for accepting interrupts is set, so interrupt processing can be accepted without waiting until the end of long data transmission, and interrupt requests can be handled even when long data is being transmitted. Responsiveness can be improved, and there is no problem in transmitting emergency data. Further, as in claim 4, if an interrupt signal indicating the interruption of data transmission is transmitted to the terminal device that interrupted the data transmission when performing the interrupt processing for urgent data, a transmission error can be detected in the data transmission due to the interrupt processing. This allows the terminal device to accurately determine that the service has been interrupted.

[Embodiment] FIG. 3 is an explanatory diagram of the operation of an embodiment of the present invention, in which a central control device 1 and a plurality of terminal devices 2 are connected by a pair of signal lines 3,
In a time division multiplex transmission method similar to the conventional example in which the central control unit 1 accesses each terminal device 2 and transmits data in a time division multiplex manner, the data is sent back to the central control unit M1 during the reply period. An interrupt request signal consisting of a signal for forcibly destroying the signal can be freely output from the terminal device 2,
When the central control unit 1 detects the destruction of the reply signal, it notifies all the terminals 2 which are replying, stops the reply, and accepts an interrupt request. In the figure, X is the data transmission period from the central control device 1 to the terminal device 2, Y is the data return period from the accessed terminal device 2 to the central control device 1, and the transmission signal sent from the central control device 1. Vs is a pulse width modulated bipolar signal, and the reply signal V11 sent back from the terminal device 2 is the signal 8.
This is a current mode signal obtained by connecting a low resistance between 3 and 3. In addition, VI is the reply signal V returned during the return period Y.
1) is a wide interrupt request signal that destroys data, and Vbi indicates a corrupted reply signal received by the central controller 1. The configuration of the data transmission system and the seven-way data transmission system are the same as the conventional example shown in FIGS. 1 and 2 described above.

The operation of the embodiment will be specifically explained below.

Now, the terminal device 2 of channel CH, is accessed from the central control device 1 and the LONG/LONGA
Reply signal b in data transmission mode of CK7 automatic
Suppose that the terminal device 2 on channel CH2 wants to send back emergency data (wall switch operation data, abnormality detection data, etc.) to the central control device 1 while sending back the data. It sends out a cutting request signal Vi that destroys the data therein. When the central control unit 1 detects that the data being returned has been destroyed,
It is determined that there is an interrupt request from one of the terminals 2.

At this point, it inverts the polarity of the transmission signal Vs to notify the terminal device 2 of channel CH that a transmission error has occurred, accepts the interrupt request, and starts predetermined interrupt processing. At this time, the terminal device 2 of channel CH2 detects the polarity reversal of the transmission signal Vs and interrupts the data return,
Channel CH.

The terminal device 2 also detects the polarity inversion of the transmission signal \ls, stops sending out the interrupt request signal Vi, and returns to normal polling mode operation.

Next, in order to search which terminal device 2 has issued an interrupt request, the central control device 1 performs interrupt mode polling, identifies the terminal device 2 that has generated the interrupt request, and
In the normal polling mode, a transmission signal Vs for accessing the interrupt request terminal 2 is sent out and a reply signal Vb is received. Note that after the above-mentioned interrupt processing is completed, the terminal device 2 of channel CH is accessed again and the interrupted data return is performed again.

As described above, in this embodiment, even if long data is being returned from the terminal device 2 to the central control unit 1, an interrupt request can be accepted immediately without waiting for the end of data transmission of one packet. This makes it possible to improve the responsiveness to interrupt requests and prevent any problems from occurring in the transmission of emergency data.

4 and 5 show other embodiments, in which a central control device 1 and a plurality of terminal devices 2 are connected by a pair of signals +1!3, and each terminal device 2 is accessed from the central control device 1. When the central control device 1 accesses the terminal device 2 and sends back the data, a host control device 5 such as a control panel that centrally operates multiple loads If there is an interrupt request, the terminal 2
The data return is stopped by transmitting a return stop command to the sender. In the embodiment, by inverting the polarity of the transmission signal "IIs" sent from the central control unit ff1l, a command to stop data return is transmitted to the terminal device 2 which is currently sending data back.

Now, from the central control device 1 to the terminal device 2 of channel CH,
is accessed and analog monitoring data such as temperature, humidity, voltage, current, etc.
When the control signal of the load connected to the terminal device 2 of channel CH2 is inputted from the upper control device 5 to the central control device 1 when the data is sent back to the central control device 1 automatically, the central control device 1 When the interrupt request is accepted, detection of the data being returned is stopped, the polarity of the transmission signal Vs is inverted, and a data return stop command is transmitted to the terminal device 2 of channel CH, thereby stopping the data return. Next, the central control device 1 accesses the channel CH2 in the next packet, transmits the control data from the upper control device 5, performs load control by interrupt processing, and then accesses the terminal device 2 of the channel CH1 again. The data return that was canceled will be performed again.

As described above, in this embodiment, when an interrupt input is received from the host controller 5 to the central controller 1, even if data is being returned from the terminal device 2, the data return is stopped and the interrupt processing is performed. Since this is done, responsiveness to interrupt requests can be improved, and there is no problem in transmitting emergency data.

FIG. 6 shows the operation of yet another embodiment, in which the central control device 1 and a plurality of terminal devices 2 are connected by a pair of signals #i3, and each terminal device 2 is accessed from the central control device 1. The data is time-division multiplexed, and the data DATA to be transmitted from the central control device 1 to the terminal device 2 is divided into fixed byte lengths and transmitted, and an interrupt is generated between the data transmission signals that transmit the fixed byte length data. Insert gate G,
Interrupt day) When an interrupt request is received from the terminal device 2 during the interrupt acceptance period set in G, data transmission is interrupted, the interrupt request terminal device 2 is searched, the interrupt request terminal device 2 is accessed, and the interrupt request is made The reply signal V11 from the terminal device 2 is received. In addition,
The gate width of the interrupt data (interrupt data) G is set to -L or more three times the pulse width of the short pulse of the transmission signal Vs.

Now, from the central control device 1 to the terminal device 2 of channel CH,
When transmitting analog control data used for Gunpa control etc. by accessing the data in LONG/5HORTACK7 format, the long data signal transmitted after the byte counter signal BC indicating the length of the transmitted data 1) AT
A is divided into fixed bytes (for example, 8.16 bytes), and each divided data D, , D2 . An interrupt data (G) is provided between D3, . . ., respectively. Here,
When the wall switch connected to the terminal 2 of channel CH2 is operated, the terminal 2 of channel CH2
When accepting an interrupt set by interrupt data (interrupt data) G, an interrupt request signal Vi is sent as a current mode signal in accordance with the period. When the central control unit 1 detects this interrupt request signal Vi, it stops data transmission, starts interrupt processing to search for the interrupt request generating terminal 2, accesses the interrupt generating terminal 2, and retrieves the emergency data. have it returned. In the terminal device 2 of channel CH, whose data reception was interrupted by this interrupt processing, since the data length transmitted by the byte counter signal BC and the data length of the received data do not match, it is determined that there is a transmission error and the terminal device 2 receives the data. This means that malfunctions will not occur due to interruptions in data transmission.

As described above, in this embodiment, long data DAT
A is divided into fixed byte length data and transmitted, and the divided data DI, D2 . Since the period for accepting interrupts is set by providing interrupt data (D3) in between, interrupt processing can be accepted without waiting until the transmission of long data DATA is completed, and long data can be transmitted. Even during the middle of the day, responsiveness to interrupt requests can be improved, and there is no problem in transmitting emergency data.

FIG. 7 shows the operation of yet another embodiment, in which, in a time division multiplex transmission system similar to the embodiment in FIG.
The data is transmitted from the terminal device 2 to the terminal device 2 that is transmitting data. In the embodiment, the interrupt reception set in the interrupt data)G is performed in the first half of the period when an interrupt request is accepted from the terminal device 2 or the upper control device 5, and in the second half when the interrupt request is received by the interrupt signal Vi'. It is designed to transmit.

In this embodiment, an interruption signal Vi' indicating an interruption of data transmission is transmitted to the terminal device 2 that interrupted the data transmission when performing interrupt processing for urgent data, so that no transmission error occurs. This allows the terminal device 2 to accurately determine that the data transmission is interrupted due to the cutting process. Note that the central control unit 1 also handles interrupt processing in other terminal devices 2 [Effects of the Invention] The present invention is configured as described above, and in the first aspect, long data can be processed from the terminal device to the central control. Even if the data is being returned to the device, it is possible to immediately accept an interrupt request without waiting for the end of data transmission for one packet, improving responsiveness to interrupt requests and making it suitable for urgent data transmission. This has the effect that no trouble occurs.

Further, in the second aspect, when an interrupt input is received from the host control device to the central control device, even if data is being returned from the terminal device, the data return is stopped and the interrupt processing is performed. Therefore, responsiveness to interrupt requests can be improved, and there is no problem in transmitting emergency data.

Furthermore, in the third aspect, the long data is divided into fixed byte length data and transmitted,
Interrupt gates are provided between divided data and the period for accepting interrupts is set, so interrupt processing can be accepted without waiting until the end of long data transmission, and interrupt requests can be handled even when long data is being transmitted. This has the effect that responsiveness can be improved and there is no problem in transmitting emergency data. Further, as in claim 4, if an interrupt signal indicating the interruption of data transmission is transmitted to the terminal device that interrupted the data transmission when performing the interrupt processing for urgent data, a transmission error can be detected in the data transmission due to the interrupt processing. This has the effect of allowing the terminal device to clearly understand that there is an interruption.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a time division multiplex transmission system according to the present invention, Fig. 2 is an explanatory diagram of the same operation as above, Fig. 3 is an explanatory diagram of the operation of one embodiment of the present invention, and Fig. 4 is another embodiment. Schematic configuration diagram of
FIG. 5 is an explanatory diagram of the same operation as above, FIG. 6 is an explanatory diagram of operation of still another embodiment, and FIG. 7 is an explanatory diagram of operation of still another embodiment. 1 is a central control device, 2 is a terminal device, 3 is a signal line, and 5 is an upper control device. 0, Ω ・0 0 ℃ Procedural amendment (voluntary) 1. Display of the case 1986 Patent Application No. 73690 2, Name of the invention Time division multiplex transmission system 3, Person making the amendment Relationship to the case Patent applicant address 1048 Kadoma, Kadoma City, Osaka Prefecture Name (58
3) Matsushita Electric Works Co., Ltd. Representative Toshio Miyoshi 4, Agent postal code 530 5, Date of amendment order 6, Number of claims increased by amendment None Delete it and insert the following sentence. "1 and multiple monitoring and control terminal devices 2" [2] Figure 2 in the attached drawings of this application has been corrected as shown in the attached sheet. Agent Patent Attorney Ishi 1) Choshichi

Claims (4)

[Claims] (1) The central controller and multiple terminals are connected by a pair of signal lines, and the central controller accesses each terminal to time-division multiplex transmit data, and the data is sent back to the central controller. An interrupt request signal consisting of a signal that forcibly destroys the reply signal can be freely output from the terminal during the reply period, and when the central control unit detects destruction of the reply signal, it sends a notification to the replying terminal. A time division multiplex transmission system characterized in that it notifies data return to be stopped and also accepts an interrupt request. (2) Connect the central control unit and multiple terminals with a pair of signal lines, access each terminal from the central control unit and time-division multiplex transmission of data, and access the terminals from the central control unit. If an interrupt request is received from a higher-level control device while data is being sent back, a return stop command is transmitted to the terminal device to stop the data return. Transmission method. (3) Connect the central control unit and multiple terminals with a pair of signal lines, access each terminal from the central control unit, time division multiplex transmission of data, and transmit data from the central control unit to the terminals. At the same time, an interrupt gate is inserted between the data transmission signals that transmit the fixed byte length data, and an interrupt request is received from the terminal device during the interrupt acceptance period set by the interrupt gate. The time division multiplex transmission is characterized in that when a data transmission occurs, data transmission is interrupted, an interrupt request terminal is searched, the interrupt request terminal is accessed, and a reply signal from the interrupt request terminal is received. method. (4) Connect the central control unit and multiple terminals with a pair of signal lines, access each terminal from the central control unit, time division multiplex transmission of data, and transmit data from the central control unit to the terminals. At the same time, an interrupt gate is inserted between the data transmission signals that transmit the fixed byte length data, and an interrupt request is received from the terminal device during the interrupt acceptance period set by the interrupt gate. When the data transmission is interrupted, the interrupt request terminal is searched, the interrupt request terminal is accessed, a reply signal is received from the interrupt request terminal, and the central control unit notifies the interrupt request terminal that the data transmission has been interrupted. A time division multiplex transmission method characterized in that data is transmitted from the terminal to the terminal that is transmitting data.