JPH09121221A - Data transmitter-receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend a transmission distance by providing a first transmission means transmitting the pulse string signal group of a first reception means to a second transmission line while a detection signal is generated and a second reception means connected with a second transmission line preventing the reception of the pulse string signal group transmitted to the second transmission line. SOLUTION: The data of an input device is fetched by an output device 12 and an arithmetic unit 13. In the output device 12 and the arithmetic unit 13, the same number as the device number 01 of the input device 11 is set as a fetching number 01. The output device 12 discriminates and selects only the data which is matched with the fetching number 01 and to which the device number 01 of the corresponding input device 11 is imparted of the data flowing in a first transmission line L1, fetches the data and outputs the data to the outside after a prescribed processing. The arithmetic unit 13 selects and discriminates only the data to which the device number 01 of the input device L1 matching with the fetching number 01 is imparted of the data flowing the first transmission line L1 and fetches the data. The device number 03 of the arithmetic unit 13 is imparted to the data and the data is transmitted to the line L1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for transmitting data such as a process amount.

[0002]

2. Description of the Related Art Conventionally, as a data transmission method, process data such as temperature collected by a slave station is transmitted by a slave station to a master station via a transmission line in response to a polling signal from the master station. There is a polling method in which after the processing, a polling signal is transmitted to another slave station again.

[0003]

However, in the polling method, the master station is always required and the polling signal is always required, so that the apparatus is complicated, the response takes time, and the communication speed is insufficient. is there.

In addition, when many devices are connected to a transmission line and data is transmitted by communication, if the transmission distance becomes long, a digital signal will be attenuated and a sufficient transmission cannot be achieved. there were.

In view of the above points, an object of the present invention is to provide a data transmitting / receiving device having a simple structure and capable of extending the transmission distance.

[0006]

According to the present invention, there is provided a first receiving means for receiving a pulse train signal group flowing through a first transmission line, a detecting means for detecting the pulse train signal group, and a detection signal for the detecting means. The first transmission means for transmitting the pulse train signal group received by the first reception means to the second transmission line and the reception of the pulse train signal group transmitted to the second transmission line are blocked while The data transmitting / receiving device comprises a second receiving means connected to a second transmission line.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention. In FIG. 1, a first transmission line L1 as a bus such as a common network as a transmission line is provided with, for example, an input device 1 as a transmission device.
1, ..., Output device 12, ..., Arithmetic device 13 ,. Then, the output device 12, ..., The arithmetic device 13 ,. Each of these devices is assigned a device number unique to the device, and data and the like can be transmitted using this device number. Further, a management device 14 for management such as a personal computer is connected to the transmission line L1 to grasp the overall configuration and operating state of each transmission device.

The data transmission / reception device 2 is provided at a required position on the first transmission line L1, and the second transmission line L
2 is connected. That is, this data transmission / reception device 2
As a result, the digital data as a pulse train signal group flowing through both transmission lines L1 and L2 is restored to its original attenuation and is transmitted bidirectionally.

First, exchange of data on the first transmission line L1 will be described. The analog signal data such as the temperature input to the input device 11 is given a unique device number of the input device 11 after being subjected to necessary processing such as linearization, and is output as digital output data on the bus L. Is output.

Then, among the data flowing through the first transmission line L1 in this way, necessary data is output from the output device 1.
2. The arithmetic unit 13 will be loaded. Therefore, depending on which input device or other output data is required for these capture devices, the device number assigned to the output data of the input device or the like required by that capture device is preset as the capture number. I'll do it.

For example, assuming that the data of the input device 11 is taken in by the output device 12 and the arithmetic device 13, the output device 1
2. The processing device 13 has the device number “01” of the input device 11.
And the same number as “01”.

The output device 12 discriminates and selects only the data which flows through the first transmission line L1 and which has the device number "01" of the input device 11 corresponding to the acquisition number "01". Output after external processing after predetermined processing.

Further, the arithmetic unit 13 selects and judges only the data having the device number "01" of the input device 11 which coincides with the take-in number "01" among the data flowing through the first transmission line L1. And import. Then, after performing the necessary averaging and other calculations, the data is given the unique device number “03” of the operation device 13 and output to the first transmission line L1.

A management device 14 for management, such as a personal computer, is connected to the transmission line L1, and the overall configuration of each transmission device is grasped by the device number, the operating state is monitored, and the like is used as a display device. When it is displayed or when an abnormal device that is not operating is found, it is displayed on the display device or an alarm is issued to the outside to take necessary measures.

Then, the digital data as a pulse train signal group flowing through the transmission line L1 is restored on the basis of the attenuation by the data transmission / reception device 2 provided at a required position of the first transmission line L1 in the direction of the transmission line L2. Be transmitted to. In addition, the first transmission line L is also connected to the transmission line L2.
The same input device 11 ′, output device, arithmetic device, management device, etc. as those in 1 are connected, and the same operation is performed. Also,
The digital data as a pulse train signal group flowing through the transmission line L2 is restored by the data transmitter / receiver 2 based on the attenuation and transmitted in the direction of the transmission line L1.

The data transmitting / receiving apparatus 2 will be described with reference to FIG. The data transmitter / receiver 2 includes a first receiving means 31 for receiving a pulse train signal group flowing through the first transmission line L1, and a first detecting means 51 for detecting the pulse train signal group of the first receiving means 31. A first signal generating means 61 such as a retriggerable monostable multivibrator which continuously generates a pulse signal of a predetermined width corresponding to the detection output signal of the pulse train signal group of the first detecting means 51.
And only the output signal of the first receiving means 31 corresponds to the continuous and continuous output of the first signal generating means 61.
Transmission means 41 for transmitting to the transmission line L2. Similarly, the second receiving means 32 for receiving the pulse train signal group flowing through the second transmission line L2 and the second receiving means 32.
Second detecting means 52 for detecting the pulse train signal group of the receiving means 32, and retriggerable for continuously generating a pulse signal of a predetermined width corresponding to the detection output signal of the pulse train signal group of the second detecting means 52. A second signal generating means 62, such as a simple monostable multivibrator, and only the 32 output signals of the second receiving means corresponding to the continuous and continuous output of the second signal generating means 62. And a transmission circuit 42 for transmitting to the transmission line L1.

The output of the first signal generating means 61 is
The operation of the second receiving means 32 for receiving the signal flowing through the second transmission line L2 is blocked through the delay means 71 provided as necessary, and the operation of the transmitting means 41 is prioritized. Similarly, the output of the second signal generating means 62 blocks the operation of the first receiving means 31 that receives the signal flowing through the first transmission line L1 via the delay means 72 provided as necessary. , The operation of the transmission means 32 is prioritized.

That is, the data flowing through the first transmission line L1 is made into a pulse signal group having a predetermined time width T, and the data transmitting / receiving device 2 uses this attenuation as a group of data for each frame and packet. Return to and transmit accurately in both directions.

The first receiving means 31 receives a pulse train signal group including a plurality of pulse train signals during a time width T flowing through the first transmission line L1 as shown in FIG. 3A, and this pulse train signal is received. With respect to the group output, for example, the rising and falling of each pulse P1 are detected by the detecting means 51, and a detection pulse signal P2 as shown in FIG. 3B is generated. The first signal generating means 61 such as a retriggerable monostable multivibrator generates a pulse signal of a predetermined width by the detection pulse signal P2, and as long as the pulse signal P2 exists, it is continuous as shown in FIG. 3 (c). It becomes the sustaining signal P3. While the continuous signal output of the signal generating means 61 is generated, the transmitting means 4
1 is capable of transmitting the signal of the receiving means 31, and FIG.
The signal corresponding to is accurately returned to the second transmission line L2 after being attenuated and is transmitted and output. Further, the detection output of the signal generating means 61 is extended by the delay means 71 and added to the second receiving means 32, and while this detection output is being generated,
The second receiving means 32 blocks the reception of the pulse train signal group transmitted from the transmitting means 41 flowing through the second transmission line L2, prioritizes the transmitting process of the first transmitting means 41, and this is completed sufficiently. Wait until the message is ready for reception. As a result, transmission / reception in only one direction is always possible, and bidirectional interference of both transmission lines L1 and L2 is prevented.

Further, the transmission / reception processing from the second transmission line L2 to the first transmission line L1 is similarly performed. Second
Of the second receiving means 32 for receiving the pulse train signal group flowing through the transmission line L2, the second detecting means 52 for detecting the pulse train signal group of the second receiving means 32, and the second detecting means 52. A second signal generating means 62 for continuously generating a pulse signal of a predetermined width corresponding to the detection output of the pulse train signal group, and a second receiving circuit corresponding to the continuous output of the second signal generating means 62. Of 32 outputs to the first transmission line L1. Further, the detection output of the signal generating means 62 is extended by the delay means 72 and added to the first receiving means 31, and while the detection output is being generated, the first receiving means 31 is connected to the first transmission line. L1
The reception of the signal transmitted from the transmission means 41 flowing through the second transmission means 42 is blocked, and the transmission processing of the second transmission means 42 is prioritized.

Incidentally, The detection means may be configured to directly detect the signal flowing through the transmission line, the signal generation means may be other than the above, and the delay circuit may be provided as necessary.

[0022]

As described above, according to the present invention, the first receiving means for receiving the pulse train signal group flowing through the first transmission line, and the detecting means for detecting this pulse train signal group,
A first transmitting means for transmitting the pulse train signal group received by the first receiving means to the second transmission line while the detection signal of the detecting means is generated, and the pulse train signal transmitted to the second transmission line. And a second receiving means connected to a second transmission line for blocking reception of the group. For this reason, the main station is not required, and the communication speed can be made sufficiently high. From the configuration consisting of a minimum of two devices and a bus, tens or hundreds or more of data and devices can be combined as far as the numbers permit. Can be easily, arbitrarily, and flexibly configured, and can easily and sufficiently cope with various systems, which is rich in flexibility and expandability, and effectively and efficiently. Further, the data transmitting / receiving device includes a receiving means for receiving a pulse train signal group flowing through one transmission line, a detecting means for detecting a signal of the receiving means, a signal generating means for generating a continuous signal corresponding to a detection output of the detecting means, The signal flowing through each transmission line can be transmitted to the other side correctly, with its attenuation restored, by the transmitting means that transmits the output of the receiving means only to the other transmission line corresponding to the output of the signal generating means. , Without re-reception of the signal transmitted by itself and without interference of signals on both transmission lines, it is always possible to transmit and receive in only one direction. Further, since the timing is shifted through the delay means to prevent the receiving means on the other side from receiving, the transmission can be prioritized, and after this is sufficiently completed, the receiving on the other side can be performed.
It is possible to reliably perform transmission / reception processing on only one side at all times, and it is possible to greatly extend the transmission distance without causing interference.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing one embodiment of the present invention.

FIG. 2 is a configuration explanatory view showing one embodiment of the present invention.

FIG. 3 is an operation explanatory view showing one embodiment of the present invention.

[Explanation of symbols]

 11, 11 'Input device 12 Output device 13 Computing device 14 Management device L1, L2 Transmission line 2 Transmission / reception device 31, 32 Reception means 41, 42 Transmission means 51, 52 2 Detection means 61, 62 Signal generation means 71, 72 Delay means

Claims (1)

[Claims] 1. A first receiving means for receiving a pulse train signal group flowing through a first transmission line, a detecting means for detecting the pulse train signal group, and a first detector while the detection signal of the detecting means is generated. The pulse train signal group received by the receiving means of the second
And a second receiving means connected to the second transmission line for blocking reception of the pulse train signal group transmitted to the second transmission line. Characteristic data transmission / reception device.