JPS59225646A - Time division multiplex transmission system - Google Patents

Abstract

PURPOSE:To improve the reliability of information transmission by setting a multiple address to transmit identical information from one terminal device to plural optional terminal devices to call simultaneously the plural terminal devices, transmitting the information so as to clarify the terminal devices at the reception side by means of a reception clarifying data and allowing a terminal device receiving the multiple address transmisson signal to return an acknowledgement signal to each return standby section. CONSTITUTION:A multiple address transmission signal VSO consists of a multiple address data DAO set to transmit identical information from a terminal device 11 to plural optional terminal services 11, -1n, an address data DA of the terminal device 12 at the transmission side, multiple address information data DC, reception clarifying data DR clarifying the terminal devices 11-1n at the reception side to which the multiple address information is to be received, and a redundancy code data DP. After the transmission of this multiple transmission signal VSO, the return standby sections T1, T3-Tn corresponding respectively to the terminal devices 11, 12-1n at the reception side clarified by the reception clarifying data DR are set. When the multiple address information data D is received correctly, the terminal devices 11, 12-1n at the reception side return each of acknowledgement signals VAK1, VAK2-VAKn corresponding to the said return standby section.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a time division multiplex transmission system in which information is time division multiplexed between #4J devices connected to the same transmission line.

[Background technology]

Conventionally, as shown in FIG. 1, a data transmission system using this type of time-division multiplexing transmission system has a plurality of terminals Q, t ) (12)...(1
n) to the same transmission line y (21), and transmits the transmission signal Vs equipped with the calling address data for calling the receiving terminal (L+) (12)...(1n) to the transmitting terminal (11). (Above 2) By transmitting from ... (1n), information was time-division multiplexed between specific terminals (1□) (12) ... (in). Time-division multiplex data transmission systems are used for data transmission in online systems such as control of various load equipment, monitoring systems, crime prevention and disaster prevention systems, 7, Word D, etc., and terminal devices (ll) (12)...・(In) has a unique address setting part for sending only, receiving only, and sending and receiving, each has a unique address setting part, and 0 and transmission line, 7 (21 is optical fiber,
It is formed from a signal line such as one twisted pair of coaxial cables. Now, in this thousands of conventional examples,
For example, when transmitting information from the terminal device (12) to the terminal device (11), the calling address data (DA) for calling the receiving terminal device (11) and the information data to be transmitted ( The transmission signal ■ consisting of Da) is transmitted to the terminal device (12)
On the other hand, other terminals (1□) (13)...
・When (in) receives a transmission signal Vs with address data (DA) that matches its own address, it takes in the information data (DC) of the transmission signal Vs and converts the signal included in the information data (Dc). Overall J\Retention check] - Redundancy such as checksum data] - De data (
Based on Dp), it is checked whether the information has been transmitted correctly. In this case, the terminal (1□
), the terminal device (1) receives the information data (DC) sent from the terminal device (12).
It becomes K to receive. Note that the address data (DAj) of the transmitting side terminal (12) may be included in the information data (DC) and transmitted. When the information is transmitted accurately in this way, the preset data from the terminal of the transmission signal Vs The reception confirmation signal YAK is sent from the receiving terminal (Sat I) within the time period set, that is, within the return waiting period α). Sending terminal'
In (12), it is determined whether the information has been transmitted correctly based on whether or not this reception confirmation No. 8 VAK is returned or not, and if the information has not been transmitted correctly, the transmission value Vs is sent again. , which was supposed to improve the reliability of information transmission.

By the way, in such a conventional example, one terminal device (12
) to another terminal (13)...(1n), the terminal (12)
, terminal devices (lr), (13), ... (1n) were called individually and the transmission signal VS for transmitting information was sequentially transmitted, but the problem was that the transmission time became significantly longer. was there.

[Purpose of the invention]

The present invention has been made in view of the above points, and it is possible to shorten the transmission time for transmitting the same information from one terminal to another, and to ensure reliable information transmission. An object of the present invention is to provide a time division multiplex transmission system that can improve performance.

[Disclosure of the Invention] (Embodiment 1) Figure 5 shows a circular transmission signal vSO of an embodiment of the method of the present invention)
The broadcast transmission signal Vso is transmitted from one terminal device (for example, (11)) to any multiplex asthmatic device (for example, (11)).
11) The broadcast address data (DAO) (for example, 0.0...0) set to transmit the same information for (1n) and the address of the transmitting terminal (12) Data (DA), broadcast information data (Dc), and receiving side terminal device (11) that should receive the broadcast information (1n
) and redundant code data (Dp). The reception example data (DH) has pits corresponding to the terminals (1□), (12), ... (1n), respectively, and the terminals set to k゛III ((11) in Fig. 5). 13) (in) )
is set as the terminal device that should receive the broadcast information data (DC). After sending this broadcast transmission fVso, return standby intervals (Tl) (Ts) corresponding to the terminals (L), (la), and (in) on the receiving side specified in the reception example data (DR), respectively. (Tn) is set. On the other hand, 94RF! The terminal device (L) (13) (in) on the receiving side, where the corresponding pit of the A indication data (DR) is "1", receives the broadcast information data (Dc) and performs redundancy]- Check whether the data has been transmitted correctly based on the received data (Dp) K, and if it has been correctly received, send a reception confirmation signal η, 1,
Return waiting period (T+
) (Ta) Returns in response to (Tn). At the sending terminal (12), there is a return waiting period ('L) (T
a) We are monitoring (Tn), and the reception of b is off.
If VAKn is not returned, the terminal device (L) (13) (in) receives the reception confirmation signal from the terminal device (L) (13) (in).
The broadcast transmission signal Vso is retransmitted to the target. Figure 4 shows terminals (12) to (11) (
13) When transmitting broadcast information for (14) (1n), a reception confirmation signal VAKs is sent in the return waiting period (Ta) (T4) after the first broadcast transmission signal VSoz.
, the VA is not returned, and the reception confirmation signal VAKa is not returned in the return waiting interval (T4) after the second broadcast transmission signal V802 to the terminals (13) and (14). The reception confirmation signal VAK4 from the terminal device (14) is received by the transmission of the second broadcast transmission value + jVSo3.
is obtained and all receiving side terminals (11) (13) (14
) (in) is a time chart showing a case where broadcast information is accurately transmitted. At this time, the terminal (14
) continues to malfunction or is out of order, the transmitting terminal @ (t2) will continue to send the broadcast transmission signal Vso repeatedly to the terminal (14), causing the data transmission system to go down. Therefore, the circular transmission signal V
So is to be retransmitted a specified number of times (several times). In addition, during the return waiting period (Ta) (T4) in which the reception confirmation signals VAK3, YAK< are not returned, the terminal device (12) on the transmitting side sends out a pseudo confirmation signal VAx' to eliminate the no-signal state. By preventing this, interrupts from other terminals (11), (13), . . . (1n) are prevented. i.e. 1 each terminal (11)
(12) ... (1n) is designed to send out a transmission signal vS after confirming that the transmission line (2) is in a no-signal state for a preset time or more, and this no-signal The status confirmation time is set relatively short in order to speed up the system's interrupt response time, and the return waiting period ('
If one or two sections of L) (Tz)...(Tn) are in a no-signal state, the no-signal section will be longer than the confirmation time, and other terminals (11) (12)... (1
There is a problem in that interrupts occur from signals (n) and malfunctions occur due to interference, but by transmitting the pseudo confirmation signal VAK', the number of no-signal states is reduced, and erroneous interrupts are prevented during the transmission process. It is designed to avoid this.

〔Effect of the invention〕

As described above, the present invention connects a plurality of terminals each having a unique address to the same transmission line, and transmits a transmission signal including calling address data for calling the receiving terminal from the transmitting terminal. In particular, in a time division multiplex transmission system in which information is time division multiplexed between specific terminals, a broadcast address is used to transmit the same information from one terminal to multiple arbitrary terminals. , and transmits a broadcast transmission signal from the transmitting terminal, which is the same as the above-mentioned broadcast address data, broadcast information data, and reception specification data specifying the receiving terminal that should receive the broadcast information, and After sending out the broadcast transmission signal, a return standby interval corresponding to each of the receiving terminals is set, and a reception confirmation signal indicating that the broadcast information has been received from the receiving terminal that received the broadcast transmission signal is sent back to standby. It is designed to send back the same information from one terminal to multiple arbitrary terminals by setting a broadcast address to call multiple terminals at the same time, and to clearly indicate reception. Since information is transmitted by specifying the receiving terminal using data, the transmission time can be significantly shortened compared to the conventional method of calling terminals individually and transmitting information. After sending the message, a return standby section corresponding to each terminal device on the receiving side is set, and a reception confirmation signal indicating that the broadcast information has been received is sent back from the terminal device that received the broadcast transmission signal to each of the above return standby sections. Therefore, the sending terminal can reliably determine whether the information has been received by the receiving terminal, increasing the reliability of information transmission.
Furthermore, the reception set by the reception explicit data,
Since a return waiting period is provided only for the terminal device on the side, there is an advantage that the time required for confirming information transmission can be shortened.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a data transmission system according to the present invention, and FIG. 2 is a diagram showing the signal format of a conventional transmission signal.
FIG. 3 is a diagram showing the signal format of a broadcast transmission signal according to an embodiment of the present invention, and FIG. 4 is a diagram illustrating the operation of the same. (1□) (12)...(1n) is a terminal device, and (2) is a transmission line. Agent Patent Attorney Ishi 1) Chief Figure 1 2 Amendment to prison procedure (voluntary) January 23, 1980 1. Indication of the case 1988 Patent Application No. 10121'7 2. Title of the invention Relationship between division multiplex transmission system 3 and the amended case Patent applicant 11°! 'Q'<1Ujlf'(1"lF'
t+lil\Ubar+°Cl1l-1ft m 1111
Name (583) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4, Agent postal code 530 8, Contents of amendment "Address data (DA) J" on page 6, line 4 of this document ’” I will correct it. 243-

Claims (1)

[Claims] +11 A plurality of terminal devices each having a unique address are connected to the same transmission line, and a transmission signal including calling address data for calling the receiving terminal device is transmitted from the sending terminal device. In a time division multiplex transmission system that transmits information between specific terminals via time division multiplexing, the same information can be transmitted from one terminal to any number of terminals. Set the broadcast address of , and send the above broadcast address data and broadcast information data from the sending terminal.
Sending out a broadcast transmission signal consisting of a reception specification date and night specifying the receiving terminal device that should receive the broadcast information, and
After sending the broadcast transmission signal, a return standby period corresponding to each of the receiving terminals is set, and a reception confirmation signal indicating that the broadcast information has been received from the receiving terminal device that received the broadcast transmission signal is sent to the return waiting period. A time division multiplex transmission method in which the signals are sent back to (2) The time division multiplex transmission system according to claim 1, wherein the broadcast transmission signal is retransmitted to the receiving terminal device to which the reception confirmation signal has not been returned. (The time division multiplex transmission system according to claim 2, which is configured to abort the retransmission of the 3-broadcast transmission signal after a predetermined number of times. A time division multiplex transmission system according to claims 1 and 2, wherein a pseudo confirmation signal is sent from a transmitting terminal at a time.