JPH0537433A - Data transmitter using digital radio network - Google Patents

Abstract

PURPOSE:To automatically remove a communication fault even when the communication fault is generated at a radio station equipment operating in an unmanned state. CONSTITUTION:When the communication fault is generated in the process of data transmission from a radio station 1 through a digital radio network 2 to a radio station equipment 3 or the like, the fault is announced from a communication adapter 11 to a terminal equipment 10. According to the fault information, the terminal equipment 10 judges the type of the communication fault. When the communication fault is generated between the communication adapter 11 and the digital radio network 2, a CPU 20 is initialized again by temporarily stopping power supply from a power source 13 while controlling a relay 22. When the communication fault is generated between the communication adapter 11 and the terminal equipment 10, the CPU 20 is initialized again after temporarily closing an RS-232C driver 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device for transmitting / receiving and transmitting data using a digital radio network called a so-called teleterminal system.

[0002]

2. Description of the Related Art Data transmission via a digital wireless network can be suitably used for remote monitoring such as monitoring the operation of a governor provided in the middle of a city gas supply path. In order to ensure data transmission, a procedure as shown in FIG. 5 is defined. In the procedure of FIG. 5, for example, the wireless station device provided near the governor becomes the calling station,
3 shows a communication sequence procedure when a wireless station device such as a monitoring center becomes a called station.

The calling station and the called station include a terminal device (hereinafter sometimes referred to as "DTE") and a communication adapter (hereinafter sometimes referred to as "TE"). Data transmission / reception is performed between the DTE and the TE and between the TE and the digital radio network (hereinafter also abbreviated as “TT”) according to predetermined procedures.
TE operates according to a preset program, and DT
To ensure smooth and reliable communication between E and TT. A session is established when the DTE of the calling station sends a connection request signal to the TE and the connection confirmation signal from the DTE of the called station is received by the DTE of the calling station. The procedure of data transmission / reception is such that the DTE of the calling station sends data to the DTE of the called station and the DTE of the called station returns the data to the DTE of the calling station. This data transmission / reception procedure can be repeated as necessary. Calling station D
The session ends when the TE sends a disconnect request signal and a disconnect response from the TT is received.

[0004]

Data transmission using a digital wireless network can be reliably performed by the procedure shown in FIG. 5, but if an abnormality occurs in the operation of the communication adapter (TE), the data transmission will be performed. You can't do it. Particularly, in remote monitoring and the like, since the wireless station device is operated unattended, it is necessary for the wireless station device itself to detect a failure caused by TE or the like and remove the generated failure.

An object of the present invention is to provide a data transmission device using a digital radio network in which a radio station device itself operating unattended can eliminate a failure caused by a communication adapter or the like.

[0006]

According to the present invention, the first station device can transmit and receive data to and from the second station device wirelessly via the digital wireless network, and when the communication fails, the digital wireless network fails. In a data transmission device using a digital wireless network for notifying, a first station device has a terminal device having an input / output port for processing data and inputting / outputting transmitted / received data, and an input / output port of the terminal device. The type of failure when connected by wire communication and capable of wirelessly transmitting and receiving data to and from the digital wireless network, when a failure notification is received from the digital wireless network and when a communication failure is detected with the terminal device A failure notification to the terminal device by a signal indicating, and includes a communication adapter that can be initialized from the terminal device, and transitions to a predetermined operating state when initialized, When receiving the failure notification from the communication adapter, the end device initializes only the communication adapter or both the input / output port and the communication adapter of itself according to the content of the failure notification. It is a data transmission device used.

According to the present invention, the terminal device communicates with its own input / output port when the type of the fault indicated by the fault notification signal from the communication adapter is a communication fault between the communication adapter and the terminal device itself. Characterized by initializing both of the adapters.

In the present invention, when the type of failure represented by the failure notification signal from the communication adapter is a communication failure between the communication adapter and the digital wireless network,
The feature is that only the communication adapter is initialized.

Further, the present invention is characterized in that the initialization of the communication adapter by the terminal device is performed by stopping the power supply to the communication adapter.

Further, according to the present invention, when the first station device receives a call by a polling method at a predetermined cycle, it has means for judging whether or not there is a call within the cycle.
When there is no call, the communication adapter is initialized.

[0011]

According to the present invention, the first station device can transmit and receive data to and from the second station device wirelessly via the digital radio network. The first station device includes a terminal device and a communication adapter. The terminal device has an input / output port for processing data and inputting / outputting transmitted / received data. The communication adapter is connected to the input / output port of the terminal device so as to be able to communicate by wire, and can transmit and receive data wirelessly to and from the digital wireless network. The digital wireless network gives a failure notification when a communication failure occurs. The communication adapter notifies the terminal device of a failure by a signal indicating the type of the failure when the communication adapter receives the communication failure and detects the communication failure with the terminal device. Upon receiving the failure notification from the communication adapter, the terminal device initializes only the communication adapter or both its own input / output port and the communication adapter according to the content of the failure notification. When the communication adapter or the input / output port is initialized, it shifts to a predetermined operation state, and when a communication failure occurs due to a locked state or the like, the cause is removed.

Further, according to the present invention, when the type of failure occurs between the communication adapter and the terminal device itself, it is possible to initialize both its own input / output port and the communication adapter to recover from the communication failure. The sex can be increased.

Further, according to the present invention, when the communication failure occurs between the communication adapter and the digital wireless network, only the communication adapter is initialized. Therefore, when the failure is caused by the communication adapter, the failure is caused. It can be removed quickly.

Further, according to the present invention, since the initialization of the communication adapter is performed while the power supply is stopped, the reliable initialization can be performed.

Further, according to the present invention, when receiving a call by the polling method at a predetermined cycle, the communication adapter is initialized when it is determined that there is no call. This makes it possible to eliminate the failure of the communication adapter even when the failure notification of the communication adapter is not issued due to the failure of the communication adapter.

[0016]

1 is a block diagram showing the electrical construction of an embodiment of the present invention. Radio station device 1 which is the first station device
Through a digital wireless network (TT) 2, a wireless station device (hereinafter may be abbreviated as “UC-R”) 3 and a wired station device (hereinafter may be abbreviated as “UC-W”). 4 can send and receive data to and from each other. The wireless station device 1 and the digital wireless network 2 are connected by a radio wave of 800 MHz band. The digital wireless network 2 and the wireless station device 3 are also connected by a wireless radio wave in the 800 MHz band. The digital wireless network 2 and the wired station device 4 are connected by a wired line 5. Within the digital wireless network 2, a management mechanism (hereinafter, may be abbreviated as "CC") that manages data transmission / reception through the digital wireless network so as to be performed smoothly and reliably.
6 is provided.

The wireless station device 1 includes a terminal device (DTE) 1
0, a reception adapter (TE) 11, an antenna 12,
A power supply 13 is included. Terminal device 10 and communication adapter 1
1 is connected by an RS-232C transmission line 14 which is a standard of EIA (Electronic Industries Association). An antenna 12 is connected to the communication adapter 11 and transmits / receives data to / from the digital wireless network 2. Similarly, the wireless station device 3 is also provided with the antenna 30.

The terminal device 10 includes a central processing unit (hereinafter abbreviated as "CPU") 15. The operation of the CPU 15 is performed according to the program stored in the memory 16, and the memory 16 also serves as a work area for the operation of the CPU 15. CPU15 has timer 1
7 is also connected, and when the time set by the CPU 15 has passed, a signal is given to the CPU 15. An RS-232C driver 18 is provided between the RS-232C transmission line 14 and the CPU 15, and performs signal level conversion and the like.

The power source 13 includes a rectified output from an AC power source (AC100V) and a backup battery,
Power can be supplied even if the AC power supply is out of power.

The communication adapter 11 includes a CPU 20, a memory 21, a relay 22, a transmission / reception circuit 23 and an RS-23.
A 2C driver 24 is included. CPU 20 is memory 2
It operates according to the stored contents of 1 and using the memory 21 as a work area. The relay 22 can be controlled by the CPU 15 of the terminal device 10, and is provided in the middle of supplying the power from the power supply 13 to the CPU 20. CPU
When the power supplied from the power source 13 is cut off by the relay 22 and the power is supplied again, the 20 performs a predetermined initialization operation according to the stored contents of the memory 21. In the initialization operation, the transmission / reception circuit 23 and the RS-232C
The driver 24 is once set to a predetermined initial state, and then various parameters are given to set it to a state where the function actually used is exhibited.

FIG. 2 shows the structure of the signal S transmitted between the terminal device and the communication adapter. The start signal S1 is
At the same time as showing that the signal S is started, it also shows what kind of procedure the signal S represents. For example,
It represents the types of signals such as "connection request" and "connection confirmation" in the procedure shown in FIG.

The self-identification signal (hereinafter sometimes abbreviated as "T-ID") indicates an identification code preset in the terminal device which has derived the signal S. The other party identification signal (hereinafter sometimes abbreviated as "R-ID") S3 indicates an identification code given in advance to the other terminal device.

The data signal S4 has a maximum of 256 bytes per packet and is data to be transmitted / received. In the part of the data signal S4, is the data further continued?
A signal is added to indicate whether the data ends. The end signal S5 indicates that one signal S ends.

The signal between the communication adapter 11 and the digital wireless network 2 is converted according to the protocol of the digital wireless network 2 based on the signal S. The communication adapter 11 also converts the signal from the digital wireless network 2 into a configuration like the signal S shown in FIG.

When the digital wireless network 2 or the management means 6 detects a phenomenon that interferes with the transmission / reception of data through the digital wireless network 2, the wireless station devices 1 and 3 and the wired station device 4 send a signal indicating a predetermined reason code. And issue a fault notification. The communication adapter 11 that received the failure notification
A signal indicating the reason code is transmitted to the terminal device 10 via the S-232C transmission line 14. When the communication adapter 11 detects that a communication failure has occurred with the terminal device 10, the communication adapter 11 also transmits a signal indicating the reason code to the terminal device 10 as a failure notification. Table 1 shows an example of the reason code. The reason code is represented by an 8-bit code, of which the upper 4 bits are R1 and the lower 4 bits are R2.

[0026]

[Table 1]

Here, UC refers to user stations such as the wireless station apparatus 1.3 and the wired station apparatus 4 which are users as viewed from the digital wireless network 2. The slow poll is a state in which a call is made to a user station and a response is waited for a predetermined time. Sch indicates a channel for transmitting / receiving a signal.

Digital wireless network 2 or communication adapter 11
From the above, when a communication failure is detected, a failure notification with a reason code as shown in Table 1 is performed. Although the reason codes in Table 1 are often due to TT and CC related to the inside of the digital wireless network 2, the digital wireless network 2 itself is constantly managed and maintained, and there is little possibility of failure, Moreover, even if it occurs, it can be repaired in a short time.

On the other hand, the communication adapter (TE) 11
The terminal device (DTE) 10 includes the CPUs 20 and 15 to perform the program operation, and the program is likely to be in a so-called locked state due to a combination of various conditions. In particular, since the communication adapter 11 has to asynchronously process the signals from the transmission / reception circuit 23 and the RS-232C driver 24, respectively, it is easy to lock when signals from both are received at the same time.

In FIG. 3, the wireless station device 1 is operated unmanned,
7 is a flowchart showing an operation when the terminal device 10 receives a failure notification. Upon receiving the failure notification, the CPU 15 of the terminal device 10 starts the interrupt operation from step a1. In step a2, the failure notification is classified according to the reason code from the communication adapter 11. The reason code for failure notification is digital wireless network (TT) or communication adapter (T).
When it relates to E), that is, when it is considered that it is caused by either TT or TE, the process moves from step a3 to step a4, the communication adapter (TE) is reset from the terminal device (DTE), and restarted. To reset the communication adapter, turn off the CPU 20 once and turn it on again.
This is done by setting the N state. For this purpose, OFF / ON control of the relay 22 is performed via the signal line 25.

The reason code of the fault notification is the terminal device (DT
E) or the communication adapter (TE), the process moves from step a5 to step a6, where R of the terminal device 10
The S-232C driver 18 is once closed and then reopened. For this closing / opening, the port for the ER signal is turned off and then turned on. ER
The signal is a signal represented by Japanese Industrial Standard (JIS) C 6361 pin number 20. This signal is a control signal indicating that data can be input / output from the DTE to the TE. The TE connects to the line when the ER signal turns on and disconnects from the line when the ER signal turns off. When the initialization of the RS-232C driver 18 in step a6 is completed, the process proceeds to step a7. Step a7 is step a4
The communication adapter (TE) is initialized in the same manner as. The time required for these initializations is, for example, about 10 seconds.

When the fault notification is another reason code,
The process moves from step a8 to step a9, and waits for a predetermined T1 time. This T1 time is, for example, 30 seconds, which is considered to be the time when the fault removal by the management means (CC) 6 of the digital wireless network 2 itself is completed. When the processing of step a4, step a7, or step a9 ends, the interrupt operation ends in step a10.

According to this embodiment, the communication adapter (TE)
Even if 11 is in the locked state, the CPU 20 executes the initial setting routine from the power-on state by turning the power supply off and then on again, and the transmission / reception circuit 23, the RS-232C driver 24, etc. Initialize and reset. The locked state of the CPU 20 rarely actually occurs. If it occurs quite often, it is possible to take countermeasures in advance. The actual problem is a locked state that occurs at a frequency that makes it difficult to reproduce the locked state and take countermeasures. Therefore, in the state where the communication adapter 11 is re-initialized, the condition for generating the lock is no longer satisfied, so that data can be transmitted and received normally by re-initializing the communication adapter 11. .. Moreover, as described above, the initialization can be attempted about three times before about 30 seconds after the fault removal by the digital wireless network 2 elapses.

FIG. 4 is a flow chart showing the operation of another embodiment of the present invention. The operation of this embodiment is similar to that of the embodiment shown in FIG. 3, and the corresponding step is "b".
The same number as that given after "a" in FIG. It should be noted that, prior to the failure notification classification in step b2, it is determined in step b11 whether or not a timeout has occurred. If it is determined that the time-out has occurred, the process moves to step b4 to re-initialize the communication adapter (TE) 11. This timeout occurs when the wireless station device 1 receives a call by the polling method at a predetermined cycle, and when no call is made within that cycle. The CPU 15 sets the timer 17 to a time slightly longer than the polling period after the last call is completed. If the next call is made within this time, the timer 17 is reset and the same time is set again. When there is no next call and the timer 17 counts out, an interrupt is issued to the CPU 15. CPU1
5 can handle a plurality of interrupts, the timer 17
It is needless to say that the interrupt signal from is given as the interrupt signal having the higher priority and the operation corresponding to step b4 may be directly performed.

According to this embodiment, the communication adapter 11 (T
Due to the locked state of E), the locked state can be canceled even when there is no communication failure in the terminal device (DTE).

In each of the above embodiments, the power supply from the power source 13 is once turned off by the relay 22 in order to initialize the CPU 20 of the communication adapter 11, but the CPU 20 is provided with a reset input terminal. Needless to say, the reset signal may be applied to the reset input terminal during the operation. Also, DTE
Although the RS and the TE are connected by the RS-232C transmission line, it goes without saying that they may be connected by the transmission line conforming to another standard.

[0037]

As described above, according to the present invention, when a communication failure occurs, the terminal device initializes only the communication adapter or both of its own input / output port and the communication adapter according to the content of the failure notification. Therefore, recovery from a communication failure can be surely and swiftly performed even when operating unattended.

Further, according to the present invention, the terminal device initializes both its own input / output port and the communication adapter when a failure occurs between the communication adapter and the terminal device itself. The chances of recovery can be increased.

Further, according to the present invention, when a failure occurs between the communication adapter and the digital wireless network, only the communication adapter is initialized, so that the failure caused by the communication adapter can be quickly eliminated. ..

Further, according to the present invention, the initialization of the communication adapter is performed by stopping the power supply to the communication adapter.
The recovery from the failure can be surely performed.

Further, according to the present invention, when the call by the polling method is received at a predetermined cycle, the communication adapter is initialized when there is no call, so that the call by polling or the failure notification is caused by the failure of the communication adapter. The function of the communication adapter can be restored even when the user is not told.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a configuration of a signal S used in the embodiment shown in FIG.

FIG. 3 is a flowchart showing an operation in the embodiment shown in FIG.

FIG. 4 is a flowchart showing the operation of another embodiment of the present invention.

FIG. 5 is a diagram showing a communication procedure via a digital wireless network.

[Description of Reference Signs] 1,3 wireless station device 2 digital wireless network 4 wired station device 6 management mechanism 10 terminal device 11 communication adapter 12,30 antenna 13 power supply 14 RS-232C transmission line 15,20 CPU 17 timer 18, 24 RS -232C driver 22 relay 23 transceiver circuit

Claims (5)

[Claims] 1. The first station device can transmit and receive data to and from the second station device wirelessly via a digital wireless network, and the digital wireless network uses a digital wireless network that gives a failure notification when a communication failure occurs. In the data transmission device, the first station device is connected to a terminal device having an input / output port for processing data and inputting / outputting transmitted / received data, and capable of wire communication with the input / output port of the terminal device,
It is possible to send and receive data wirelessly with digital wireless networks,
When a failure notification is received from the digital wireless network or when a communication failure with the terminal device is detected, the terminal device is notified of the failure by a signal indicating the type of failure, and the terminal device can be initialized. , A communication adapter that shifts to a predetermined operating state when initialized, the terminal device, when receiving a failure notification from the communication adapter, according to the content of the failure notification, only the communication adapter, or its own A data transmission device using a digital wireless network characterized by initializing both an input / output port and a communication adapter. 2. The terminal device, when the type of failure represented by the failure notification signal from the communication adapter is a communication failure between the communication adapter and the terminal device itself, both of its own input / output port and the communication adapter. A data transmission device using a digital wireless network according to claim 1, wherein 3. The terminal device initializes only the communication adapter when the type of failure represented by the failure notification signal from the communication adapter is a communication failure between the communication adapter and the digital wireless network. A data transmission device using the digital wireless network according to claim 1. 4. The digital wireless network according to claim 1, wherein the initialization of the communication adapter by the terminal device is performed by stopping power supply to the communication adapter. Data transmission device using. 5. The first station device has means for judging whether or not there is a call within a predetermined cycle when receiving a call by a polling method at a predetermined cycle, and when there is no call, the first station of the communication adapter is initialized. A data transmission device using a digital wireless network according to any one of claims 1 to 4, characterized by: