JPH01213095A - Data transmission equipment - Google Patents

Abstract

PURPOSE:To obtain the data of present time immediately, and to prevent the data during the period of trouble from being lost by obtaining measured data automatically by using a host for backup off-line even if a data gathering host can not gather the data on account of the trouble. etc. CONSTITUTION:A processing part 2 monitors always call time from the data gathering host 31, and when lapse time from the call time stored in a host station number, etc., storage circuit 5 elapses, it reads the latest data preserved in a data storage circuit 4, and reads a telephone number to which the host 32 for backup off-line is connected, and originates a call, and on a reply from the host 32, it edits and transmits the data. Therefore, even if the host 31 goes wrong, a central monitoring station 33 can obtain the measured data at every definite time by the host 32 without using human power, and in addition, even if the host 31 is stopped for a long period and it exceeds the storage capacity (period) of the circuit 4, the measured data is never lost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a data transmission device for centrally monitoring an air pollution monitoring system or the like.

(Prior art) A conventional central monitoring station has a collection master connected to the subscriber telephone network, a standby machine for manual replacement when the collection master breaks down, and a backup machine for manually replacing the collection master when the collection master is offline during normal operation. A standby/offline master is installed for the purpose of batch processing, and the collector calls one measuring station at regular intervals, for example once every hour, and collects data. When the data transmission device of the measurement station receives a call from the collection parent, it reads measurement signals from the measuring device at regular intervals, edits the data corresponding to the call from the stored data, and transmits the data.

In general, simple systems include a collection parent at a central monitoring station;
Computer systems are used for backup and offline parents. Furthermore, the measurement station data transmission device has a limited capacity to store measurement data.

(Problem to be Solved by the Invention) However, personal computers are less reliable than industrial minicomputers, have a much lower abnormality monitoring function, and generally do not have an external output for abnormalities. In the conventional simple system, only the data collection parent is connected to the subscriber telephone network, and the data collection parent calls the data transmission device of the measurement station at regular intervals to collect data.

If the data collection master malfunctions and stops or the calling operation stops, the abnormality can be recovered manually, but it is necessary to replace it with a spare machine and restart it. If data cannot be collected due to an abnormality or the like, there is a limit to the storage capacity of the data transmission device, and data may be lost at regular intervals. Further, after an abnormality recovery, the longer the suspension period is, the more time it takes to collect data stored in the storage device of the data transmission device during the suspension period, which also causes problems in data monitoring at the time of recovery.

Furthermore, it is only possible to take measures against abnormalities in the data collecting parent after humans detect abnormalities in the data collecting parent, which requires manpower.

In order to solve the problems of the prior art, the present invention provides a central monitoring station with a collection parent and a backup/offline parent,
If the collection parent is unable to call the data transmission device at regular intervals due to an abnormality, etc., the data transmission device monitors the call time and does not receive a call even after a certain period of time has passed. By confirming that this is the case and transmitting data from the data transmission device to the backup/offline parent, even if the collection parent is abnormal, the central monitoring station can automatically obtain measurement station data, and the data transmission device's memory The purpose is to ensure that data is not lost even if the memory capacity of the circuit is limited, and to improve the reliability of the system.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a central monitoring station with a collection parent and a backup/offline parent, and the backup/offline parent performs offline batch processing as necessary while the collection parent is in operation. , has the function of receiving, processing, and storing data transmitted from the slave station, and the processing unit of the data transmission device of the slave station receives calls from the master for collection at a fixed period from a predetermined time to a time determined for each measurement station. When the time has elapsed, an alert is sent to the phone number stored in the master station number storage circuit, and the stored data to be sent to the data collection parent is backed up.
This is a data transmission device that has the function of transmitting data to a parent for offline use.

(Function) The processing unit of the data transmission device receives calls from the collection parent at regular intervals based on the determined time.
When the time set for each measuring station has elapsed, the data to be sent to the collection parent is transmitted to the backup and offline parent connected to the subscriber line whose number is stored in the parent station number storage circuit. Even if the collection master stops due to an abnormality and cannot be called and collected, the central monitoring station monitors the current measurement data using the back amplifier/offline master.

(Embodiment) FIG. 1 is an example of a block diagram of the configuration of a data transmission device 2 according to the present invention. The data transmission device is connected to a modem 24 with a network control device connected to a subscriber telephone network 22 and a modem interface 1, and a processing unit 2 having functions such as processing functions.
, the system time of the data transmission device is measured, and the processing unit 2
A clock circuit 3 that can change the current time from the processor 2, a data storage circuit 4 that can write, read, and erase measurement data from the processing unit 2 at regular intervals, and a backup/offline parent 3.
] A storage circuit 5 for storing the number and parameters of the subscriber line connected to which the main station number, parameters, etc. can be written and read; a panel interface 6 for connecting the input/output maintenance panel 7 and the processing section 2; a main station number, parameters, etc. It consists of an input/output maintenance panel 7 that performs input/display and other input/output necessary for maintenance, an analog input pulse input that reads measurement signals from a plurality of measuring instruments 23 according to commands from the processing section 2, digital input, etc. input circuit 8,
The output circuit 9, which performs control output etc. to the measuring instrument 23 in response to commands from the processing unit 2, supplies DC power to the clock circuit 3, data storage circuit 4, and master station number storage circuit 5 even during a power outage, and serves as a power supply circuit during normal operation. The device is composed of a backup power supply circuit 10 which receives power from a battery 11 and which floats charges the battery, and a power supply section 11 which supplies stable DC power to each part.

The processing unit 2 reads the current time from the clock circuit 3, issues a command to the input circuit 8 at the time when data should be read and controlled,
A measurement signal is read from the measuring device 23, data is received, and the data is written into the data storage circuit 4.

Further, a command is issued to the output circuit 9 to perform control output to the measuring instrument 23.

When the processing unit 2 receives a call from the data collection parent 3I, it reads the data of the time to be transferred included in the call information stored in the data storage circuit 4, edits it, and sends the data to the modem interface 1 and the network control device. The data is transferred to the data collection parent 31 via the attached modem 24, and when the communication is completed, the line is cut off. If the call information includes time adjustment information, the time is passed to the clock circuit 3 to correct the current time. Further, when the processing section 2 receives parameters such as the master station number and various fixed times from the attendance maintenance panel 7, it writes the information into the master station number etc. storage circuit 5.

Further, if there is any other request necessary for maintenance from the input/output panel 7, the processing section 2 performs an operation according to the request.

The processing unit 2 constantly monitors the call time from the data collection parent 31 at regular intervals, and when the elapsed time α from the call time stored in the master station number etc. storage circuit 5 has passed, the data storage circuit 4 Data collection parent 31 stored in
A backup/offline master 32 reads the latest data to be sent to the master station number, etc. and stores it in the master station number storage circuit 5.
reads the telephone number of the subscriber line to which it is connected, issues an alert, and when a response is received from the backup/offline parent 32, the data is edited, transmitted, and communication is terminated.

In addition, 41a, 41b to 41n are measurement stations (slave stations), 42 is a signal line, 43a, 43b to 43n are data transmission devices, and 4
4 is an uninterruptible power supply.

An example of the processing flow for these processes is shown in FIG.

Even if the data collection parent 31 stops due to an abnormality, etc., the data transmission device of the measuring station will transfer the data to the backup/offline parent 32 when the call time passes the parameter elapsed time value input for each measuring station. 7- Can.

Therefore, in the central monitoring station 33, even if the data collection parent 31 fails, the backup offline parent 32 can obtain measurement data at regular intervals without having to go through the acquisition process.
Moreover, even if the data collection master 31 is stopped for a long period of time, the measured data will not be lost even if the stop exceeds the storage capacity (period) of the data storage circuit 4 of the data transmission device.

In addition, since the input of the parameter elapsed time value can be changed for each measuring station, if you set a different value for each measuring station, you can simultaneously input the elapsed time value from multiple measuring stations to the backup offline master 32.
will not be reported.

The parameters etc. stored in the storage circuit 5 such as the master station number of the data transmission device may be held as fixed values in the ROM of the processing section 2 and cannot be changed. Alternatively, a method of setting using a switch or the like may be used.

The backup/offline host 32 does not have to be located at the same location as the central monitoring station where the collection host 31 is installed, but may be installed wherever necessary for operational purposes.

〔Effect of the invention〕

In a simple data collection system that uses a personal computer as the data collection parent using a subscriber telephone network,
By adopting the data transmission device of the present invention, even if the data collection parent is unable to collect data due to a malfunction, etc., the backup and
You can automatically obtain measurement data using the offline device, so you don't have to worry when you need the current data immediately, and you can use it to collect data even if the data transmission device fails to store measurement data for a longer period of time. data for that period will not be lost.

Therefore, reliable data collection can be achieved at a low price.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a data transmission device showing one embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment, and FIG. 3 is an explanatory diagram of the operation flowchart of FIG. 1.

Claims (1)

[Claims] In a data transmission device using a polling digital transmission method using a telephone subscriber network, etc., there are multiple master stations installed in parallel, and one of these master stations that is always in operation transmits a polling signal for measurement. A data transmission device comprising a first function and a second function of transmitting data to another master station when the polling signal does not arrive for a certain period of time.