JP2634711B2 - 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 a data transmission apparatus for transmitting and receiving 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. To ensure data transmission, a procedure as shown in FIG. 5 is defined. In the procedure of FIG. 5, for example, a radio station provided near the governor is a calling station,
A communication sequence procedure when a wireless station device such as a monitoring center becomes a called station will be described.

[0003] The calling station and the called station include a terminal device (hereinafter sometimes abbreviated as "DTE") and a communication adapter (hereinafter sometimes abbreviated as "TE"). Data transmission and reception are performed between the DTE and the TE and between the TE and the digital wireless network (hereinafter sometimes abbreviated as “TT”) according to predetermined procedures.
TE operates according to a preset program, and DT
The communication between E and TT is performed smoothly and reliably. The session is established when the DTE of the calling station sends a connection request signal to the TE and the DTE of the calling station receives the connection confirmation signal from the DTE of the called station. The procedure of sending and receiving data 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 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]

Although data transmission using a digital wireless network can be reliably performed according to the procedure shown in FIG. 5, if an error occurs in the operation of a communication adapter (TE), data transmission is performed. You will not be able to do it. In particular, in remote monitoring and the like, since the wireless station device operates unattended, it is necessary for the wireless station device itself to detect a fault caused by TE or the like and remove the fault that has occurred.

It is an object of the present invention to provide a data transmission apparatus using a digital radio network in which an unattended radio station apparatus itself can remove a fault caused by a communication adapter or the like.

[0006]

According to the present invention, a first station apparatus can mutually transmit and receive data to and from a second station apparatus by radio through a digital radio network. In a data transmission device using a digital wireless network that performs notification, a first station device has a terminal device having an input / output port for processing data and inputting / outputting transmission / reception data, and an input / output port of the terminal device. It is connected communicably by wire, can transmit and receive data wirelessly to and from a digital wireless network, receives a failure notification from the digital wireless network, and detects a communication failure with a terminal device. And a communication adapter for performing a failure notification to the terminal device by a signal representing the terminal device, and capable of being initialized from the terminal device and transitioning to a predetermined operation state when initialized. The terminal device, upon receiving a failure notification from the communication adapter, initializes only the communication adapter or both its own input / output port and the communication adapter according to the content of the failure notification. This is the data transmission device used.

Further, according to the present invention, 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, the terminal device communicates with its own input / output port. It is characterized in that both adapters are initialized.

Further, according to the present invention, when the type of the failure indicated by the failure notification signal from the communication adapter is a communication failure between the communication adapter and the digital wireless network,
It is characterized in 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 power supply to the communication adapter.

Further, according to the present invention, when the first station apparatus receives a call by a polling method at a predetermined cycle, the first station apparatus has means for judging the presence or absence of the call within the cycle.
When there is no call, the communication adapter is initialized.

[0011]

According to the present invention, the first station apparatus can mutually transmit and receive data to and from the second station apparatus by radio through a 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 transmission / reception data. The communication adapter is communicably connected to an input / output port of the terminal device by wire, and is capable of wirelessly transmitting and receiving data to and from a digital wireless network. The digital wireless network notifies a failure when a communication failure occurs. The communication adapter notifies the terminal device of a failure with a signal indicating the type of the failure when receiving the failure communication and detecting a communication failure with the terminal device. When 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, the communication adapter or the input / output port shifts to a predetermined operation state. When the communication adapter or the input / output port falls into a locked state and causes a communication failure, the cause is eliminated.

Further, according to the present invention, when a type of failure occurs between the communication adapter and the terminal device itself, both the own input / output port and the communication adapter can be initialized to recover from the communication failure. Sex can be increased.

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

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

According to the present invention, when a call is received 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 terminal device is not notified of the failure due to the failure of the communication adapter.

[0016]

FIG. 1 is a block diagram showing an electrical configuration of an embodiment of the present invention. Radio station device 1 as the first station device
Is a wireless station device (hereinafter sometimes abbreviated as “UC-R”) 3 or a wired station device (hereinafter sometimes abbreviated as “UC-W”) via a digital radio network (TT) 2. 4 can exchange data with each other. The wireless station device 1 and the digital wireless network 2 are connected by an 800 MHz band radio wave. The digital wireless network 2 and the wireless station device 3 are also connected by an 800 MHz band radio wave. The digital wireless network 2 and the wired station device 4 are connected by a wired line 5. In the digital wireless network 2, a management mechanism (hereinafter, sometimes abbreviated as "CC") for managing transmission and reception of data via the digital wireless network so as to be performed smoothly and reliably.
6 are provided.

The wireless station device 1 includes a terminal device (DTE) 1
0, a receiving 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 of America). An antenna 12 is connected to the communication adapter 11 to transmit and receive data to and from the digital wireless network 2. Similarly, the wireless station device 3 is 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 a program stored in the memory 16, and the memory 16 also functions as a work area for the operation of the CPU 15. The CPU 15 has a timer 1
7 is also connected, and a signal is given to the CPU 15 when the time set by the CPU 15 has elapsed. 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 supply 13 includes a rectified output from an AC power supply (AC 100 V) and a backup battery.
Power can be supplied even when 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.
2C driver 24 is included. The CPU 20 is a memory 2
1 operates according to the stored contents 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 on the way to supply power from the power supply 13 to the CPU 20. CPU
When the power supplied from the power supply 13 is cut off by the relay 22 and the power is supplied again, the unit 20 performs a predetermined initialization operation according to the contents stored in 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 set to a state in which various parameters are given and 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 indicating that the signal S is started, it indicates what kind of procedure the signal S represents. For example,
It represents the type of signal 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 from which the signal S was derived. A partner identification signal (hereinafter sometimes abbreviated as "R-ID") S3 indicates an identification code given to the terminal device on the partner side in advance.

The data signal S4 has a maximum of 256 bytes per packet and is data to be transmitted and received. A part of the data signal S4 indicates whether the data is continued or not.
A signal indicating whether the data ends is attached. 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 based on the signal S in accordance with the rules of the digital wireless network 2. The communication adapter 11 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 which hinders data transmission / reception via the digital wireless network 2, the digital wireless network 2 or the management means 6 sends a signal indicating a predetermined reason code to the wireless station apparatuses 1 and 3 or the wired station apparatus 4 And issue a failure notification. The communication adapter 11 that has received the failure notification
A signal representing the reason code is transmitted to the terminal device 10 via the S-232C transmission line 14. When detecting that a communication failure has occurred with the terminal device 10, the communication adapter 11 transmits a signal representing 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, the UC indicates a user station such as the wireless station device 1.3 and the wired station device 4 which are users as viewed from the digital wireless network 2. A 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 and receiving signals.

Digital wireless network 2 or communication adapter 11
Thereafter, when a communication failure is detected, a failure notification with a reason code as shown in Table 1 is performed. Although many of the reason codes in Table 1 are caused by TT and CC related to the inside of the digital radio network 2, the digital radio network 2 itself is constantly managed and maintained, and the possibility of failure is small, Moreover, even if it occurs, it is 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 for performing program operations, and the program is likely to be in a so-called locked state by a combination of various conditions. In particular, since the communication adapter 11 must asynchronously process signals from the transmission / reception circuit 23 and the RS-232C driver 24, it is easy to lock when signals from both are simultaneously received.

FIG. 3 shows that the radio station apparatus 1 is operated unattended,
5 is a flowchart illustrating 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 of the failure notification is a digital wireless network (TT) or a communication adapter (T
In the case of E), that is, when it is considered to be caused by either TT or TE, the process proceeds from step a3 to step a4, where the terminal device (DTE) resets and restarts the communication adapter (TE). To reset the communication adapter, turn off the CPU 20
This is performed by setting the state to N. For this purpose, the relay 22 is turned off / on via the signal line 25.

The reason code of the failure notification is the terminal device (DT
E) or due to the communication adapter (TE), the process moves from step a5 to step a6,
The S-232C driver 18 is once closed and reopened. For the closing / opening, the port for the ER signal is turned off and then turned on. ER
The signal is a signal represented by the pin number 20 of C6361 of Japanese Industrial Standard (JIS). This signal is a control signal indicating that data can be input / output from the DTE to the TE. The TE is connected to the line when the ER signal is turned on, and is disconnected from the line when the ER signal is turned 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 in. The time required for these initializations is, for example, about 10 seconds.

When the failure notification is another reason code,
The process proceeds from step a8 to step a9, and waits for a predetermined time T1. This T1 time is, for example, 30 seconds, and is a time when it is considered that the failure removal by the management means (CC) 6 of the digital wireless network 2 itself is completed. When the processing in 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 off the power once and turning it on, and the transmission / reception circuit 23, the RS-232C driver 24, etc. Initialize and reset. The lock state of the CPU 20 hardly actually occurs. If it occurs at a considerable frequency, it is possible to take countermeasures in advance. What actually poses a problem is a lock state that occurs at such a frequency that it is difficult to reproduce the lock state and take measures. Therefore, in a state in which the communication adapter 11 is reinitialized, the condition that caused the lock is not satisfied. Therefore, by reinitializing the communication adapter 11, data can be transmitted and received normally. . Moreover, as described above, the initialization can be attempted about three times before the elapse of about 30 seconds in which the digital wireless network 2 performs the failure removal.

FIG. 4 is a flowchart 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.
, The same number as the number added 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 a timeout has occurred. If it is determined that a timeout has occurred, the process proceeds to step b4, where the communication adapter (TE) 11 is reinitialized. The timeout occurs when the wireless station device 1 receives a call by the polling method at a predetermined cycle and the call is not performed within the cycle. The CPU 15 sets the timer 17 to a time slightly longer than the polling cycle after the previous 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 generated for the CPU 15. CPU1
When the timer 5 is capable of processing a plurality of interrupts, the timer 17
Of course, may be given as an interrupt signal having a higher priority, and the operation corresponding to step b4 may be performed directly.

According to the present embodiment, the communication adapter 11 (T
By the lock state of E), the lock state can be canceled even when no communication failure occurs in the terminal device (DTE).

In each of the above embodiments, although the power supply from the power source 13 is temporarily turned off by the relay 22 in order to initialize the CPU 20 of the communication adapter 11, the CPU 20 is provided with a reset input terminal. Of course, the reset signal may be supplied to the reset input terminal. Also, DTE
Although the RS and the TE are connected by an RS-232C transmission line, the transmission line may be connected by a 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 its own input / output port and the communication adapter according to the contents of the failure notification. Therefore, even if the operation is performed unattended, it is possible to reliably and quickly recover from a communication failure.

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 likelihood 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. .

According to the present invention, the initialization of the communication adapter is performed by stopping the power supply to the communication adapter.
Recovery from a failure can be reliably performed.

According to the present invention, when a call is received by the polling method at a predetermined cycle, the communication adapter is initialized when there is no call. Even when not performed, the function of the communication adapter can be restored.

[Brief description of the 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. 1;

FIG. 3 is a flowchart showing an operation in the embodiment shown in FIG. 1;

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.

[Explanation of symbols]

 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 Transmission / Reception Circuit

Claims (5)

(57) [Claims] 1. A first station device can mutually transmit and receive data to and from a second station device by radio via a digital wireless network. When a communication failure occurs, the digital wireless network uses a digital wireless network for notifying a failure. In the data transmission device, the first station device is connected to a terminal device having an input / output port for performing data processing and for inputting / outputting transmission / reception data, and is communicably connected to the input / output port of the terminal device,
Data can be transmitted and received wirelessly with 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, the terminal device is notified of the failure by a signal indicating the type of the failure, and can be initialized from the terminal device. A communication adapter that shifts to a predetermined operation state when initialized, and 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, wherein both the input / output port and the communication adapter are initialized. 2. The terminal device according to claim 1, wherein 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, both the input / output port and the communication adapter are used. 2. A data transmission apparatus using a digital wireless network according to claim 1, wherein: 3. The terminal device initializes only the communication adapter when the type of the failure indicated 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 apparatus using a 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, when receiving a call by the polling method at a predetermined cycle, has a means for determining the presence or absence of a call within the cycle. When there is no call, the first station apparatus initializes the communication adapter. The data transmission device using a digital wireless network according to any one of claims 1 to 4, wherein the data transmission device performs data conversion.