JPH0316345A - Multiplex transmission system - Google Patents

Abstract

PURPOSE:To enhance the transmission efficiency and to decrease number of reception units in use by gathering plural units having idle channels together, sending a data to one set of reception unit. CONSTITUTION:Transmission/reception units 61-63, 7 connecting to stations 1, 21, 22 are functioned in one address and common channel addresses (1)-(8) are assigned in common to each unit. Channels (1)-(3) are used for the transmission unit 61 and the other channels are set as non-use by an E/D setting means 9. Then the transmission/reception units 61-63 send a data only in the timing given by an address through the channel set to be active and do not send any signal in other channels, then the channels are used in the channel addresses (1)-(8) so as not to be in duplicate so as to apply reception processing to the data from the plural transmission/reception units 61-63 in the one reception unit 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention connects a master station and a plurality of slave stations via a transmission path, and transmits data that is time-division multiplexed according to the transmission timing that the master station can control. This invention relates to a multiplex transmission system for transmitting data to Citalink.

[Example 1 of this kind This type of transmission system is employed for monitoring various types of equipment, and an example of its use will be explained using No. 117'l. 1 is a master station, 21 to 2 are slave stations, and 3 is a transmission line connecting these stations. The master station 1 is equipped with a central control unit 4 that adjusts the transmission timing at each station and controls the transmission and reception of data at its own station, and the slave stations 2I to 2 synchronize the transmission timing given by the Control data transmission and reception at the station? Terminal control units 51 to 53 are provided, respectively.

Also, each station 1, 2, to 23 has v! It has a manual terminal of i loss (8, pe in this example), and each system @ part 4 and 5
It has transmitting units 6l to 6, which send data of a plurality of channels according to input signals to the transmission line 3 via the transmitting units 1 to 5, and the same number (8 points) of output terminals as the input terminals of the transmitting unit l. , and receiving units 7 to 73 which receive each channel data sent out from the transmitting unit via each of the control units 4 and 51 to 5, and output a signal in accordance with this data, are connected as appropriate. The transmitting unit and the receiving unit 1 are provided in correspondence with each other via the transmission path 3, and in this example, 6
1 and 71, 62 and 72, 6, and 7 correspond to each other by having the same address, and eight channels of data can be sent and received between the corresponding units.

Each of the transmitting units 61 to 6 has 8 input terminals and a maximum of 8 input terminals. ! It is possible to handle type 1 pulse signals (flow rate pulses, etc.), and in this example, unit 6. In , there are three types of pulse signals P1 to P, and in Enit 6 ■, there are also three types of pulse signals P4 to P6, and in unit 6, there are two types of pulse signals. The pulse signals P7 and P8 are respectively input. The pulse signal sent to the transmitting unit is sent to each unit 6.
The count value is counted from each unit 6, . . . -6 for each channel as fixed-length 7-code data. The receiving units 71 to 73 each have eight output terminals corresponding to the transmitting units, and receive the most popular eight channels of data sent from the transmitting units.
Based on this data, pulses are output from each output terminal, and in this example, the transmitting unit 6. Corresponding to ~6, unit 71 connects meters such as flowmeters H, ~M■, unit 7
2, the pulses are output to meters H and M6, and Enit 7 outputs pulses to meters H and M8. Problem 1: By the way, in the conventional transmission system as described above, There is no problem if almost all the human terminals of the transmitting unit connected to each station are used, but as shown in Figure 1, there are many cases where only a few transmitters are handled, which is less than the number of terminals provided. , there are problems of deterioration of transmission efficiency and high cost. In other words, even if there is an empty channel that is not used in each unit, data transmission/reception timing will be assigned to all channels in the system including this empty channel, and the timing of data transmission will be delayed. The transmission cycle becomes unnecessarily short compared to the number. Also, regardless of the number of channels used, one transmitting unit always requires one receiving unit.
The cost of the system configuration is quite high. Therefore, the problem to be solved by the present invention is that the transmitting unit has an empty channel at the IF. However, the question is whether it is possible to improve transmission efficiency and reduce costs by effectively utilizing the transmission timing allocated to these vacant channels.

[Means for Solving the Problem 1] In order to solve this problem, the present invention has a structure that sends data of a plurality of channels to a transmission line in response to human input signals to a plurality of input terminals provided, and E/D (enable/disable) setting means is provided to set whether the channel is used or not used, and only the data of the channel set to be used by the E/D setting means is transmitted to the parent. A transmitting unit sends data to the transmission line according to the timing given to each channel by the station, and a plurality of output terminals are provided based on the timing 1 given to each channel by the master station, and receive data of each channel from the transmission line according to the timing 1 given to each channel. A receiving unit/dead unit that outputs a signal from the main station and a slave station are appropriately connected to a master station and a slave station, and a plurality of transmitting units whose seven addresses of the channels set on the user side by the E/D setting means do not overlap with each other. , a plurality of channels of data are transmitted and received with a single receiving unit.

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described based on the examples shown in FIGS. 2 and 3.

FIG.
is exemplified.

The transmitting unit 6 has 7 addresses (L) to (8) for each channel.
) having DIP switches 8 arranged corresponding to
A D (enable/disable) setting means 9 is provided, and is configured so that it can be specified for each channel whether the channel is to be used (enabled) or not used (disabled). Also transmitting unit 6
The counters 11-118 count the pulse signals input to each input terminal 101-10, and the transmitting buffer 12. -12
．． is provided for each channel, and the enable signal given by the E/D setting means 9 and the transmission timing given by the terminal control section 5 (or the central control section 4 in the case of a master station) are AND date 13.
, -13B to each channel, and outputs the transmission data from the buffer 7 only in the channel set to be used by the E/D setting means.

The receiving unit 7 includes receiving buffers 141 to 14, which receive data sent from the transmitting unit via the central control unit 4 (terminal control unit 5 in the case of a slave station), and each output terminal 1.
5. The initial value is set based on the data provided by the pulse generating circuit 16, ~lea, and the receiving buffer 77, which outputs a pulse signal from ~158, and the pulse signal is output every time a pulse is output from the pulse generating circuit. Counter 17, ~17, that performs counting
and is configured to output pulses based on the counting data sent from the transmitting unit 6. FIG. 3 shows an example of a system that handles the same signals as in FIG. 1 using the transmitting/receiving units 6 and 7 having such a configuration.

Transmitting/receiving Unison 1/6~ connected to each station 1/2l/22
Units 6, 7 function on the same address, and common channel addresses (1) to (8) are assigned to each unit. Transmission unit 6. In this case, channels (1) to (3) are used, and the other channels are set to the unused side by the E/D setting means 9. The transmitting unit 6 uses channels (4) to (6), and other channels are set to be unused. In the transmitting unit 6, channels (7) (8
) is used; everything else is not used.

With this structure, the transmitting units 61 to 63 transmit data only at the timing determined by the address of the channel set on the user side, and do not transmit any signals on other channels, so (1) to (8) If channels are used so as not to overlap each other among the channel addresses as described above, one receiving unit 7 can receive and process data from a plurality of transmitting units 6, -6. Also, if we compare the transmission that is affected here with the case of Fig. 1, in this example, the timing given by the channel addresses (1) to (8)? It is sufficient to transmit 8 pieces of data, whereas in FIG. 1 there are 3 sets of transmitting/receiving units, so each unit must transmit a total of 24@ data of 8 channels.

Note that the present invention is not limited to the above example; for example, the signals handled are not limited to pulse signals, but analog signals such as voltage, current, and temperature can also be transmitted, and in this case, the signals handled by the transmitting unit are A D conversion stage T= and a D/^ conversion means are provided on the receiving unit side, respectively, and the data is converted into digital data and transmitted.

[Effect of the invention 1] The present invention is configured as described above, and even if one transmitting unit has an empty channel, a plurality of units that also have an empty channel can be grouped together and data can be exchanged with one receiving unit. Transmission and reception can be performed, and the transmission efficiency can be improved and the number of receiving units used can be reduced, reducing cost.
Fl low is the town Noh.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing an example of rice control. Fig. fjS2 is an explanatory diagram of the transmitting/receiving unit according to the present invention. FIG. 3 is an explanatory diagram showing an example of a system using the same transmitting/receiving unit. 1 is a master station, 21 to 2 are slave stations, 3 is a transmission path, 4 is a medium heat control section, 51 to 5 are terminal control sections, 6 to 63 are transmitting units, 7 is a receiving unit,

Claims (1)

[Claims] (1) In a multiplex transmission system that connects a master station and a plurality of slave stations via a transmission path and cyclically transmits time-division multiplexed data according to the transmission timing given by the master station, a plurality of input terminals are provided. E/D (enable/disable) has a configuration that sends data of multiple channels to a transmission path according to input signals to the E/D, and sets whether to use or disable the channel for each channel.
a transmitting unit comprising a setting means and transmitting only the data of the channel set on the user side by the E/D setting means to the transmission path according to the timing given to each channel by the master station; and the timing given to each channel by the master station. a receiving unit that receives data of each channel from a transmission path according to the above data and outputs signals from a plurality of output terminals provided based on the received data, and is appropriately connected to a master station and a slave station, and is used in the E/D setting means. 1. A multiplex transmission device characterized in that data of a plurality of channels is transmitted and received between a plurality of transmitting units whose channel addresses set on each side do not overlap with each other and one receiving unit.