JPH05304506A - Time division multiplex data transmission system - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency by revising dynamically a time length of own station read data in a reception station. CONSTITUTION:A data signal 101 is sent from a data signal transmission circuit 11 of a transmission station 1 to a bus line. Furthermore, a read signal 102 is sent from a read signal circuit 12 to a system signal line. The read signal 102 is received by a read signal reception circuit 22 in a reception station 2 and a data signal reception circuit 21 starts reading of the own station data in the data signal 101 and when the read is finished, a read signal transmission circuit 23 sends a read signal 103 to a reception station 3. A read signal reception circuit 31 in the reception station 3 receives the call signal 103 and the data signal reception circuit 31 starts reading of own station data from the data signal 101. When the read is finished, data transmission from the transmission station 1 is repeated again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division multiplex data transmission system, and more particularly to a time division multiplex data transmission system of a system for reading a data signal of its own station from a time division multiplex data signal by a read signal.

[0002]

2. Description of the Related Art Conventionally, as a time division multiplex data transmission system of this type, there is a system shown in FIG. FIG. 2 is (a) a block diagram showing a system configuration of a conventional example, and (b) a time chart for explaining the operation. This figure shows the case where the number of receiving stations is two. In FIG. 1A, a time-division multiplexed data signal 201 is transmitted from a transmitting station 4 to receiving stations 5 and 6 via a bus line. Further, the read signals 202 and 203 are transmitted from the transmitting station 4 to the receiving stations 5 and 6 through the system signal line. In the receiving stations 5 and 6, the read signals 202 and 203 from the transmitting station 4 are received by the read signal receiving circuits 52 and 62, respectively, so as to know the time when the data for the own station is read out, and the signal of the data signal 201 is used to identify the own station. The data signal is read by the data signal receiving circuits 51 and 61. In this read operation, as shown in FIG. 1B, the receiving station 5 reads the data 4-5 portion of the data signal 201 at the timing of the read signals 202 and 203 from the transmitting station 4, and the receiving station 6 then reads the data 4-5. The part -6 is read out. The timing for reading these is determined by the read signal from the transmitting station.

[0003]

As described above, in the conventional time division data transmission system, it is necessary for the transmitting station to have the read signals for the number of receiving stations, and the system signal line for transmitting the read signals. Are concentrated, and the configuration of the transmitting station becomes complicated. In addition, there is a problem that the division time width of the time division must be decided in advance, and the division time width and the number of divisions cannot be dynamically changed.

[0004]

According to the time division multiplex data transmission system of the present invention, a plurality of receiving stations are provided with a time division multiplexed data signal from a transmitting station and a read signal designating a read start time point of the data signal. To a bus line connected in a bus shape and a plurality of system signal lines directly connected to each of the receiving stations, and at each of the receiving stations, the read signals are sequentially received from the receiving stations close to the transmitting station, and In a time division multiplex data transmission system for reading out data for its own station from a data signal, the system signal line is configured to connect the respective receiving stations in tandem from the transmitting station as a starting point. The data signal and a read signal of the receiving station adjacent to the transmitting station are sent to the bus line and the system signal line, respectively, and the receiving station receives the read signal. After the data for the own station is read from the data signal and the reading is completed, the read signal is sent to the next receiving station, and each of the receiving stations receives the read signal of the preceding receiving station and sequentially receives the data for the own station. This is a method of reading data.

[0005]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a block diagram of this embodiment, and FIG. 1B is a time chart. Normally, the number of receiving stations is 1.
The number of stations is 0 or more, but in this embodiment, it is 2
The station. In FIG. 1A, a data signal 101 is sent from a transmission station 1 to a bus line from a data signal transmission circuit 11. Further, the read signal circuit 12 to the read signal 102
Is transmitted to the system signal line. In the receiving station 2, the read signal receiving circuit 22 receives the read signal 102, the data signal receiving circuit 21 starts reading the data for the local station of the data signal 101, and when the read is completed, the read signal transmitting circuit 23 outputs the read signal 102. The read signal 103 is sent to the receiving station 3. The receiving station 3 outputs the calling signal 103 to the read signal receiving circuit 31.
Then, the data signal receiving circuit 31 starts reading the data for its own station from the data signal 101. When this reading is completed, the data transmission from the transmission station 1 is repeated again.

FIG. 1B is a time chart for explaining the read operation, in which the receiving station 2 receives the read signal 102 and reads the data 1-2 of the data signal 101 for its own station. Next, the receiving station 3 receives the read signal 103 and receives the data for its own station 1-
3 is read and this operation is repeated again.

[0007]

As described above, according to the present invention, since the data acquisition of the receiving station is performed from the acquisition end point of the preceding receiving station, the time division interval length of the data signal is dynamically changed. Therefore, the transmission efficiency can be improved.
Further, since the read signal transmitting circuit is distributed, it is effective in avoiding the complication of the circuit of the transmitting station.

[Brief description of drawings]

FIG. 1A is a block diagram of an embodiment of the present invention, FIG.
It is a time chart.

2A is a block diagram of a conventional example, and FIG. 2B is a time chart.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 transmitting station 2, 3 receiving station 11 data signal transmitting circuit 12 read signal transmitting circuit 21, 31 data signal receiving circuit 22 read signal transmitting circuit 23, 33 read signal receiving circuit 101 data signal 102, 103 read signal

Claims (1)

[Claims] 1. A transmitting station, a plurality of receiving stations, a bus line connecting the transmitting station and the plurality of receiving stations in a bus shape, and a direct connection between the transmitting station and each of the receiving stations. From the transmitting station of the system including a plurality of system signal lines for transmitting the time-division-multiplexed data signal and a read signal for designating a read start time point of the data signal at each of the receiving stations. Time-division multiplexed data transmission, which is sent to a plurality of system signal lines, respectively, and in each of the receiving stations, the read signal is sequentially received from the receiving station close to the transmitting station, and data for the own station is read from the data signal. In the method, the system signal line is configured to connect the receiving stations in a tandem manner from the transmitting station as a starting point, and the data signal is adjacent to the transmitting station from the transmitting station. The read signal of the receiving station is sent to the bus line and the system signal line, respectively, and the receiving station adjacent to the transmitting station receives the reading signal and reads the data for the own station from the data signal Time division multiplexing, characterized in that the read signal is sent to the next receiving station, and each receiving station receives the read signal of the receiving station located in front and sequentially reads the data for its own station. Data transmission method.