JP2732962B2 - Data transmission device using digital wireless network - Google Patents

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 for remote monitoring by a plurality of stations using a digital radio network called a so-called teleterminal system.

[0002]

2. Description of the Related Art For example, monitoring of the opening of a governor provided in the middle of a gas supply path can be performed by data transmission using a digital wireless network. A radio wave of a specific frequency band is assigned to the digital radio network in advance, and data can be reliably transmitted according to a predetermined communication sequence.

FIG. 10 shows a schematic procedure in data transmission through a digital wireless network. In data transmission such as remote monitoring via a digital wireless network, one station becomes a master station, and it is necessary to call a plurality of slave stations by polling or to call the master station when an abnormal situation occurs. A method of calling a parent station from a child station that has occurred is used. The device of each station is provided with a terminal device (hereinafter sometimes abbreviated as “DTE”) and a communication adapter (hereinafter sometimes abbreviated as “TE”).
, And bidirectional communication with a digital wireless network (hereinafter sometimes abbreviated as “TT”). The DTE of the calling station transmits a connection establishment procedure from transmitting a connection request to receiving a connection confirmation, a data transmission / reception procedure from transmitting data to receiving data, and transmitting a disconnection request. The data transmission is performed through a line disconnection procedure from the reception of the connection response to the reception of the disconnection response.

[0004]

In a data transmission apparatus using a digital wireless network, a detailed procedure is determined in advance, and consideration is made so that reliable data transmission can be performed. Therefore, the communication adapter (TE) has a central processing unit (hereinafter abbreviated as “CPU”) independently realized by a microcomputer or the like, and transmits data according to a predetermined program. If the reception of data from the DTE or the reception of data from the digital wireless network (TT) competes at a specific timing, the CPU of the TE is locked and cannot operate normally, or the TE and the DTE There is a possibility that the data transmission to and from the terminal is locked. As described above, when the lock state occurs between TE or TE and DTE, FIG.
Data transmission according to the procedure shown in the figure cannot be performed.

An object of the present invention is to provide a data transmission apparatus using a digital wireless network capable of preventing data transmission from becoming impossible due to a locked state or the like and performing reliable data transmission. That is.

[0006]

[0007]

[0008]

According to the present invention, a plurality of station devices can communicate with each other via a digital radio network for data transmission / reception, and each station device includes a terminal device for performing data processing, A communication adapter that is provided between the terminal device and the digital wireless network, performs wired communication with the terminal device, performs wireless communication with the digital wireless network, and transitions to a predetermined operation state when initialized; The terminal device includes first to fourth timers T1 to T4 for measuring a predetermined set time, and the terminal device initializes the communication adapter TE for each first timer T1 if communication is not in progress and performs communication if communication is in progress. For example, the first timer T1 is further reset, the communication adapter TE is initialized each time a polling call is performed, the second timer T2 is started, and after the connection is confirmed, the second timer T2 is reset. From the start of the second timer T2 the second
If the connection is not confirmed during the time of the timer T2, the communication is cut off, the connection is confirmed, the third timer T3 is started, and after the data is received, the third timer T3 is reset. When data is not received during the time T3, the communication is disconnected, the fourth timer T4 is started after the data is received, the fourth timer is reset after the reception of the communication disconnection, and the fourth timer T4 is started from the start of the fourth timer T4. If the communication disconnection is not received during the time of T4, the communication is disconnected, and after the communication is disconnected, and when there is a failure notification from the digital wireless network, if the polling is completed, the first timer T1 is set. As a reset,
If the communication is not being performed, the communication adapter TE is initialized. If the communication is being performed, the operation returns to the operation of resetting the first timer T1. If the polling is not completed, the next station device is called and the second timer T2 is reset. A data transmission device using a digital wireless network, which is characterized by returning to a start operation.

[0009]

[0010]

[0011]

According to the present invention, one of the plurality of station devices that mutually transmit and receive data via the digital wireless network includes a terminal device, a communication adapter, and a timer. The terminal device initializes the communication adapter at the start of communication and at the end of communication, and initializes the communication adapter every time the time set in the timer elapses when communication is not performed. Since the terminal device initializes the communication adapter before starting communication or after ending communication, even if the communication adapter is locked before communication is performed or during communication, it can be returned to a communicable state again. it can. The terminal device initializes the communication adapter every time a predetermined set time elapses using a timer. In the case where a polling call is received at predetermined time intervals, by setting the timer setting time slightly longer than the polling cycle, initialization can be performed even if a functional failure such as a communication adapter occurs at the time of the polling call. And reliable data transmission can be performed. In particular, according to the present invention, the first to fourth timers T
Since the operations are sequentially corrected using 1 to T4, not only the communication adapter TE can be initialized, but also the operation can be achieved sequentially and reliably.
The connection is not held undesirably, and when there is a failure notification from the digital wireless network, if the polling has been completed, the first timer T1 is reset to the state shown in FIG.
The operation is repeated by resetting at step d45 of step d45, and if polling is not completed, step d26 of FIG.
Thus, communication can be performed by calling the next station device. As a result, the wireless station device can be reliably returned to a state in which the function for data transmission is exhibited.

[0012]

FIG. 1 is a block diagram showing an electrical configuration on which the present invention is based. The master station 1 transmits data via the digital wireless network 2 to a plurality of slave stations 3 for remote monitoring or the like by a polling method. Master station 1 and digital wireless network 2
Can communicate with the radio wave of 800 MHz band,
Communication between the digital wireless network 2 and the slave station 3 is also possible using the 800 MHz band radio wave.

The master station 1 includes a terminal device (DTE) 10,
A communication adapter (TE) 11, an antenna 12, and a power supply 13 are included. The terminal device 10 and the communication adapter 11 are connected in a wired manner by a transmission line 14 according to the RS-232C standard by the Electronic Industries Association of the United States (abbreviated as “EIA”). The power supply 13 supplies power to the terminal device 10 and the communication adapter 11. The power supply 13 converts electric power from a commercial AC power supply (AC 100 V) into DC and supplies it. The power supply 13 is also backed up by a battery, and power is supplied from the battery at the time of a power failure.

The terminal device 10 includes a CPU 15,
It operates according to a program stored in the memory 16 in advance. A timer 17 is connected to the CPU 15,
When the time set by U15 is counted, a signal is given to CPU15. CPU 15 and RS-232C transmission line 14
The RS-232C driver 18 is provided between the two.

The communication adapter 11 is provided with a CPU 20 and converts data between the terminal device 10 and the digital wireless network 2 in accordance with a program stored in a memory 21 in advance. The power of the CPU 20 is supplied from the power supply 13 via the relay 22. The CPU 20 is initialized from a power cutoff state to a state where data conversion is possible according to a procedure preset in the memory 21 when power is supplied. In the CPU 20,
A transmission / reception circuit 23 is connected, and communicates with the digital wireless network 2 via the antenna 12. An RS-232C driver 24 is provided for connection with an RS-232C transmission line that connects between the CPU 20 and the terminal device 10.
The relay 22 is turned off / on by a signal from the CPU 15 via a line 25.

The slave station 3 also includes a terminal device 30 and a communication adapter 3
1, including an antenna 32 and a power supply 33, and has a configuration similar to that of the master station 1.

FIG. 2 is a flowchart showing the operation of the master station 1 shown in FIG. The operation is started in step a1, and the time is counted using the timer 17 for the polling time in step a2, and the operation waits until the time elapses. In step a3,
Reset or initialize the communication adapter (TE).
In step a4, a line for one slave station 3 is established. In step a5, data transmission / reception with one slave station 3 is performed. In step a6, a disconnection request signal is transmitted to the digital wireless network 2. In step a7, the process waits until there is a disconnection response from the digital wireless network 2. Then step a
In step 8, the communication adapter is reset, and the process ends in step a9. When polling a plurality of slave stations 3, the procedure from step a4 to step a7 may be repeated.

FIG. 3 is a flowchart showing the operation when the slave station 3 responds to the polling from the master station 1. The operation is started from step b1, and in step b2, in response to the call from the master station 1, it waits for an incoming call instruction given from the digital wireless network 2 to be received. Upon receiving the incoming call instruction, an incoming call response is transmitted in step b3. Next, data transmission / reception is performed in step b4, and the process waits until a disconnection instruction from the digital wireless network 2 is received in step b5. After receiving the disconnection instruction, the communication adapter (TE) is reset in step b6, and the process ends in step b7.

FIG. 4 is a flowchart showing an operation when the slave station 3 detects an abnormality and urgently transmits data to the master station 1. Slave station 3 which started operation in step c1
Waits until emergency call data is generated in step c2. When the data is generated, in step c3, the communication adapter (TE)
Reset. Next, a line is established in step c4, data is transmitted in step c5, a disconnection request signal is transmitted in step c6, and the process waits until a disconnection response signal is received in step c7. The communication adapter is reset in step c8, and the process ends in step c9.

[0020]

FIG. 5 is a flow chart showing the operation of the master station 1 according to a further prerequisite configuration of the present invention. In this configuration, the timer 17 shown in FIG.
Includes five user timers T2, T3, T4. The operation starts in step d1, and the timer T1 is reset in step d2. In step d3, the timer T1 is counted up, and in step d4, it is determined whether or not the timer T1 has timed out. Step d5 if not timeout
To determine whether or not there is polling. When polling is present, the communication adapter 11 is reset in step d6,
In step d7, polling for calling the n-th slave station is started. Note that FIG. 5 forms one flowchart together with FIGS. 6, 7 and 8, and each figure includes:
And interconnected by.

If T1 times out at step d4, it is determined at step d8 whether communication is in progress.
If communication is not being performed, the communication adapter 11 is reset in step d9, and the process returns to step d2. During communication,
In step d10, the timer T1 is reset, and the process proceeds to step d5.

Referring to FIG. 6, in step d11, the timer T2 starts counting time. At step d12, a connection request signal is transmitted to the digital wireless network 2. In step d13, it is determined whether or not a connection confirmation signal has been received from the digital wireless network 2. When it is received, a session is established in step d14. Next, at step d15, the timer T2 is reset, and at step d
Then, the procedure of the line connection from 11 ends.

Next, at step d16, time measurement by the timer T3 is started. In step d17, a data request signal is transmitted. Next, in step d18 of FIG.
It is determined whether data has been received from digital wireless network 2. When the data is received, in step d19, the timer T3 is reset, and the procedure of data transmission and reception from step d16 ends.

Next, at step d20, the timer T4 starts counting time, and at step d21, a disconnection request signal is transmitted. In step d22, it is determined whether a disconnection response signal from the digital wireless network 2 has been received. If received, the timer T4 is reset in step d23, the session is released in step d24, and the procedure of line disconnection from step d20 ends.

At step d25, it is determined whether or not the polling has been completed. If not completed, a call is made to the next (n + 1) th slave station 3 at step d26, and the process returns to step d11. When the polling ends in step d25, the process returns to step d3 in FIG.

If no signal is received from the digital wireless network 2 in steps d13, d18 and d22, steps d27 to d3 are respectively performed.
2, Step d33 to Step d38, Step d39
To Step d44. In these operations, when the timers T2, T3, and T4 are out of time or when there is a failure notification from the digital wireless network 2, the call to the slave station 3 is terminated, and the call to the next slave station is started.

FIG. 9 shows a master station 1 in one embodiment of the present invention.
5 is a part of a flowchart showing the operation of FIG. This embodiment is similar to the configuration shown in FIGS. 5 to 8, and portions corresponding to FIGS. 5 to 8 are denoted by the same reference numerals. The operation corresponding to FIG.
Is shown in It should be noted that when polling is completed in step d25, the timer T1 is reset in the next step d45, and the process returns to step d3 in FIG.

Although the configurations shown in FIGS. 5 to 8 and the embodiment shown in FIG. 9 are shown for the case of the master station 1, the same applies to the slave station 3.

[0030]

As described above, according to the present invention, since the terminal device initializes the communication adapter at the start of communication and after the end of communication, a locked state or the like occurs between the communication adapter or the communication adapter and the terminal device. In this case, the locked state can be canceled and reliable communication can be performed.

[0031]

Further, according to the present invention, the terminal device initializes the terminal device before the communication starts and at the end of the communication, and when the communication is not being performed, the terminal device disconnects the communication adapter after a time set in advance in the first timer T1. initialize. Thus, reliable data transmission can be performed. That is, according to the present invention, even in a state where control from the digital wireless network is impossible due to a failure in the communication adapter, the terminal device can periodically initialize the communication adapter in the terminal device, and Reliable data transmission can be performed. According to the present invention, the communication adapter can be initialized before the communication starts, after the communication starts, and periodically, so that the communication adapter becomes undetectable and abnormal (for example, when the terminal Even in the case where the communication adapter appears to be operating normally from the device (for example, in the case of an abnormality in a digital wireless network), reliable data transmission can be performed. Further, according to the present invention, since the first to fourth timers are used to enable the sequential operation, the communication state is not undesirably maintained, and the failure notification from the digital wireless network is performed. If the polling has been completed, the first timer T1 is reset to return to the original operation if polling has been completed, and if the polling has not been completed, the next station apparatus is called and the second timer T2 is started. Return to Thus, the operation can be repeatedly and reliably performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration which is a premise of the present invention.

FIG. 2 is a flowchart showing the operation of the configuration of FIG.

FIG. 3 is a flowchart showing an operation of the configuration of FIG. 1;

FIG. 4 is a flowchart showing the operation of the configuration of FIG. 1;

FIG. 5 is a flowchart showing the operation of another prerequisite configuration of the present invention.

FIG. 6 is a flowchart showing the operation of the configuration of FIG. 5;

FIG. 7 is a flowchart showing the operation of the configuration of FIG. 5;

FIG. 8 is a flowchart showing the operation of the configuration of FIG.

FIG. 9 is a flowchart showing the operation of one embodiment of the present invention.

FIG. 10 is a diagram showing a procedure of data transmission via a digital wireless network.

[Explanation of symbols]

 Reference Signs List 1 master station 2 digital wireless network 3 slave station 10.30 terminal device 11, 31 communication adapter 12, 32 antenna 13, 33 power supply 14, 34 RS-232C transmission line 15, 20, 35, 40 CPU 17, 37 timer 18, 24, 38, 44 RS-232C driver 22, 42 Relay 23, 43 Transmitter / receiver circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ichiro Sugimoto 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (72) Inventor Mitsutoshi Yamada 4-chome Tsunashima Higashi, Kohoku-ku, Yokohama (1) Matsushita Communication Industrial Co., Ltd. (72) Inventor Jun Kanda 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama City, Kanagawa Prefecture

Claims (1)

(57) [Claims] A plurality of station devices can mutually communicate for data transmission / reception via a digital wireless network, and each station device has a terminal device for performing data processing and a terminal device and a digital wireless network. A communication adapter that performs wired communication with the terminal device, wirelessly communicates with the digital wireless network, and shifts to a predetermined operation state when initialized, and a timer for measuring a predetermined set time. The terminal device includes first to fourth timers T1 to T4, wherein the terminal device initializes the communication adapter TE for each first timer T1 if not communicating, and further sets the first timer T1 if communicating. Reset, initialize the communication adapter TE each time a polling call is performed, start the second timer T2, reset the second timer T2 after confirming the connection, and start the second timer T2. If the connection is not confirmed within the time of the second timer T2 from the time, the communication is disconnected, the connection is confirmed, the third timer T3 is started, and after the data is received, the third timer T3 is reset, and the third timer T3 is started. When the data is not received during the time from the third timer T3, the communication is disconnected, the fourth timer T4 is started after the data is received, the fourth timer is reset after the reception of the communication disconnection, and the fourth timer T4 is started. If the communication disconnection is not received during the time from the fourth timer T4, the communication is disconnected. After the communication is disconnected, and when there is a failure notification from the digital wireless network, if polling is completed, Reset the first timer T1 and initialize the communication adapter TE if not communicating, and return to the operation of resetting the first timer T1 if communicating. If the polling has not been completed, the data transmission apparatus using the digital wireless network returns to the operation of calling the next station apparatus and starting the second timer T2.