JP3063319B2 - Data collection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a data collection method in a data collection system in which a monitoring station collects data by a polling method from a plurality of observation stations using a single radio line.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram of an example of a monitoring station, and FIG.
FIG. 7 is a block diagram of an example observation station, FIG. 7 is a diagram showing an example of a transmission format, FIG. 8 is a flowchart of processing of a conventional monitoring station, and FIG. 9 is a flowchart of processing of a conventional observation station.

The configuration of the monitoring station will be described with reference to FIG.
A wireless device 21 including a receiver 22 and a transmitter 23 for switching between transmission and reception by the press talk switch 20, a CPU 24 for controlling processing of each unit, and data from the receiver 22 connected to a bus of the CPU 24 are temporarily stored. Receiver 2
6, a transmission unit 27 for temporarily storing data transmitted from the transmitter 23, a digital output unit 28 for switching the press-talk switch 20 and transmitting a signal for transmitting data from the transmitter 23, for example, 1; A digital input unit 29 for reading and inputting a calling station (observation station) set in the above and an observation time such as an hour, a clock 30, a printer output unit 31 for outputting data to be printed by the printer 34, It comprises an external output unit 32 for outputting data to an external host computer, and a memory 25.

The configuration of the observation station will be described with reference to FIG. 6 taking a water level observation station as an example. A radio device 36 comprising a receiver 37 and a transmitter 38 for switching between transmission and reception by a press talk switch 35, and processing of each unit A CPU 39 for controlling
A receiving unit 41 connected to the bus of the CPU 39 for temporarily storing data from the receiver 37, a transmitting unit 42 for temporarily storing data transmitted from the transmitter 38, and a press-talk switch 35 for switching the data from the transmitter 38. A digital output unit 43 for transmitting a signal for transmitting
And a digital input unit 44 for reading and inputting data from the water level gauge 45.

Next, the transmission format will be described with reference to FIG. 7. The word arrangement is such that a synchronization word (SYN) and up to 15 data words (W1 to W) are arranged as shown in FIG.
n), and the data word consists of a start bit (ST) and a stop bit (SP), as shown in (B).
A 32-bit initial transmission having a station address area (SA), a word address area (WA) indicating the number of a word, a data area, and a parity bit area (P), and an inverted continuous transmission in which 1 and 0 are inverted. They are more than a pair.

As shown in FIG. 2C, a call signal for calling a monitoring station from a monitoring station includes a station address area (SA) and a return request flag area between a start bit (ST) and a stop bit (SP) of a data word. (BF), a word address area (WA) to be numbered 0, a start address area that is always set to 1 to specify the number of data to be returned, and 1 to 1
5 stop address areas.

[0007] As shown in (D), a signal returned from the observation station to the monitoring station has a station address area (S) between the start bit (ST) and the stop bit (SP) of the data word.
A), a word address area (W
A), a 16-bit data area and a parity bit area (P).

Next, taking the case of the data collection system shown in FIG. 1A as an example, the processing flow of the monitoring station 10 is shown in FIG.
This will be described with reference to FIG. Since the case where the observation data from the observation stations 4 is collected is described in detail as a representative example, the collection of the observation data from the observation stations 1 to 3 is simply shown.

In step 1, the time is read from the clock 30. In step 2, an observation station for collecting observation time and data is read from the operation device 23. When the observation time is reached in step 3, a boring method is used. The data collection processing of the observation station 1 is performed, the data collection processing of the observation station 2 is performed in Step 5, and the data collection processing of the observation station 3 is performed in Step 6.

Next, the data collection process will be described in detail using the observation station 4 as a representative example. In step 7, the station address 4 is set in the transmission section 27 of FIG.
, The pre-talk switch 20 is set to the transmission state on the dotted line side in step 8, the calling signal shown in FIG. 7C is transmitted from the transmitter 23, and when the transmission is completed in step 9, , A signal of 0 is sent through the digital output unit 28, and the
Is set to the receiving state with the solid line side, and if there is received data in step 11, the receiving unit 26 reads the received data, and if the address is the same as the transmission address in step 13,
In step 14, the data is sent to the printer 34 via the printer output unit 31 for printing, and output to an external computer or the like via the external output unit 32.

In step 11, for example, if noise is generated in the propagation path and normal reception is not possible and time out occurs, the process proceeds to step 17 and in the case of the first call, step 8
In the case of the second call, missing data is processed and the process returns to step 1.

Next, the processing flow of the observation station 4
An example will be described with reference to FIG. If there is received data in step 1, in step 2, the receiving unit 41 of FIG. 6 reads the received data. In step 3, if the address is 4, the process proceeds to step 4, and the water level meter is inputted via the digital input unit 44. The water level value of 45 is read, 1 data is sent through the digital output unit 43, the press talk switch 35 is set to the transmission state on the dotted line side in step 5, and the water level data is set in the transmission unit 41 in step 6. And FIG.
The return signal shown in (D) is transmitted from the transmitter 38. When the transmission is completed in step 7, a signal of 0 is transmitted through the digital output unit 43, and in step 8, the pre-talk switch 35 is set to the solid line side and received. State.

In step 3, if the address is not 4, the process returns to step 1. Observation stations 1-4 operate in the same manner as described above. In other words, the conventional monitoring station 10 prevents the missing data by calling up again when the data is missing due to the occurrence of noise in the propagation path or the like.

[0014]

However, if continuous external noise such as noise due to the operation of a machine tool or discharge due to insulation failure of a high-voltage line or continuous interference due to abnormal propagation occurs in the propagation path, the conventional method will be used. There is a problem that missing measurement cannot be prevented by calling the data collection method again.

An object of the present invention is to provide a data collection method capable of preventing missing data even when continuous noise occurs in a propagation path.

[0016]

FIG. 1 is a diagram illustrating the principle of the present invention. As shown in FIG. 1A, in a data collection system in which a monitoring station 10 collects data from a plurality of monitoring stations 1, 2, 3, and 4 by a polling method using a single wireless line, the monitoring station 10 For example, when first instructing the observation station 4 to transmit data, as shown in FIG. 1B, the first code 0 is added before the address 4 of the observation station as an address code, and the transmission is performed. When the signal of the same address code 04 can be received within a predetermined time, the signal is received. When the signal cannot be received within the predetermined time due to noise or the like,
As shown in FIG. 1C, the address code of the observation station 2 to be relayed is added before the address 4 of the observation station as shown in FIG. If a signal can be received within a predetermined time, it is received.

As shown in FIG. 1B, the observation station 4 receives an address code signal with the first code 0 added before its own address 4 and receives the address code. The observation data with the same address code 04 as that of the observation data is transmitted.

As shown in FIG. 1 (C), the observation station 2 of the relay station receives a signal of an address code having its own address 2 added before the address 4 of another station, and receives the signal. The address 2 of the own station is converted into the first code 0 and transmitted. When the signal of the same address code 04 as the transmitted signal can be received within a predetermined time, the signal is received and converted to the address code 24 before the conversion. Convert and send.

[0019]

According to the present invention, the monitoring station 10 is, for example, the observation station 4
1B, a data transmission command is issued with the address code set to 04 as shown in FIG. 1B. When data cannot be received within a predetermined time due to continuous noise or the like, for example, the observation station 2 is relayed. As shown in FIG. 1 (C), an address code is set to 24 and a data transmission command is issued in order to change the propagation path so that the data of the observation station 4 is collected.

Then, the observation station 2 receives this, converts the address code to 04, and transmits a data transmission command. Then, the observation station 4 receives the address code because it is addressed to the own station, and returns the data as the address code 04 that received the address code.

Then, the observation station 2 receives the address code 04, which is the same as the transmitted address code, converts the address code into the received address code 24, and transmits the return data. Then, since the monitoring station 10 has the same address code as the one transmitted, the monitoring station 10 receives it and collects data.

That is, if the monitoring station 10 cannot receive the propagation path with the observation station 4 due to continuous noise or the like, the monitoring station 10 changes the path and collects data, thereby preventing missing data.

[0023]

FIG. 2 is a flowchart of a process of a monitoring station according to an embodiment of the present invention, FIG. 3 is a flowchart of a process of an observation station according to an embodiment of the present invention, and FIG. 4 is a case of two-stage relay according to the embodiment of the present invention. 3 is a diagram showing address code conversion of FIG.

Also in the case of the present invention, the monitoring station 10 and the observation stations 1 to 1
4 is as shown in FIGS. 5 and 6, and the transmission format is also as shown in FIG. 2 and 3 show the case of the data collection system of FIG. 1A. The flowchart of the processing of the monitoring station 10 of FIG. 2 differs from the conventional example of FIG. That the station address 4 of FIG.
3 is different from the conventional example in FIG. 9 in the flowchart of the observation station in FIG.
FIG. 9 shows the point of the observation station 4, the point where the address 4 in step 3 is changed to the address code 02, and the point where steps 9 to 23 are added. This will be described below.

The observation station will be described first for the relay observation station 2, and then the data collection observation station 4 will be described. In the data collection system shown in FIG. 1A, the observation station 4 is farthest from the monitoring station 10 and has a high possibility of missing due to noise. In the case of the observation station 3, there is a peak in the propagation path and the loss is large. Since the monitoring station 2 is close to the monitoring station 10 and the observation station 4, the monitoring station 10 is preset to use the observation station 2 as a relay station when data cannot be collected from the observation station 4.

The processing of the monitoring station 10 will be described with reference to FIG.
When the data of the observation station 4 is collected, the address code 04 is set in the transmission unit of FIG. 5 in step 7 and the station address (SA) of the calling signal in FIG. Is set to 04 and the data transmission request is transmitted. If there is received data in step 11, it is read in step 12, and in step 13, if the address code is the same as the address code 04 at the time of transmission, it proceeds to steps 14 and 15 and outputs it to the printer 34 in FIG. And print it out, output it to the outside, and output it to the host computer.

When the address code at the time of transmission is, for example, 24, in step 13, if the address code is the same 24,
Proceeding to steps 14 and 15, the data is output to the printer 34 shown in FIG. 5, printed, output to the outside, and output to a host computer or the like.

If it is determined in step 11 that the reception is not possible and the time is over in step 16, the process proceeds to step 17. In step 17, if the call is the first time, the observation station 2
Is set as the relay station, the address code 24 is set in the transmitting section 27, the station address of the calling signal in FIG. If the call is the second call in step 17, the missing data processing is performed as in the conventional case.

Next, the case of the observation station 2 will be described with reference to FIG. If the address code is 02 in step 3, the water level data is read as in the conventional case, and the station address of the return signal in FIG.

If the address code is not 02 in step 3, the process proceeds to step 9, and if the address code is 2 "" in step 9, the process proceeds to step 10. This time is 24, so go to step 10. In step 10, the address code 2 is changed to 0 to change it to 04. In step 11, the press-talk switch 35 of FIG. 6 is set to the transmission state with the dotted line side. In step 12, 04 is set in the transmission section 42, The station address of the call signal of FIG. 7 (C) is set to 04, transmitted via the transmitter 33, and when the transmission is completed in step 13, the pre-talk switch 35 is set to the solid line side in step 14, the receiving state is set, and the step goes to step 15. move on.

If there is received data in step 15, the process proceeds to step 17, where the receiving unit 26 of FIG. 6 reads the data. In step 18, if the address code is the same as 04 at the time of transmission, the process proceeds to step 19. move on. In step 19, 0 of "" is converted into 2 and converted to 24, and the station address of the return data shown in FIG. 7D is set to 24. In step 20, the press talk switch 35 is set to the dotted line side to make the transmission state. At 21, reception data (return data) is set in the transmission section 42 and transmitted via the transmitter 33. When transmission is completed at step 22, the pre-talk switch 35 is set to the solid line side at step 23 and the reception state is set. And return to step 1.

If there is no received data in step 15,
Proceed to step 16 and return to step 1 if the time is over. In step 18, the address code is
If not, the process returns to step 15.

The observation station 4 proceeds to step 3 via steps 1 and 2 in FIG.
4, the process proceeds to step 4, where the water level is read from the water level gauge 45 via the digital input unit 44 in FIG. 6, and a signal of 1 is transmitted via the digital output unit 43 at step 5 to switch the press-talk switch 35 on. In step 6, the water level data of the address code 04 is set in the transmitting section 42 in step 6 and transmitted from the transmitter 38. When the transmission is completed in step 7, in step 8, 0 is set via the digital output section 43. , And the press-talk switch 35 is set to the receiving state with the solid line side, and the process returns to step 1.

That is, when the monitoring station 10 cannot normally receive the return signal from the monitoring station 4 due to external noise or the like, the monitoring station 10 recalls via another monitoring station. The address code at this time is, for example, 24.

Observing station 2 recognizes that it relays itself in the upper 2 and, after receiving this signal, converts the address code to 04 and transmits it. The observation station 4 returns a return signal of the address code 04 upon receiving the retransmitted calling signal.

Before the calling signal from the observation station 2, the monitoring station 10
Address code is 24 even if a call signal from
Therefore, there is no response, and the call signal from the observation station 2 and the return signal from the observation station 4 do not overlap.

In the observation station 2, the address code 04 at the time of transmission is used.
Therefore, the return signal from the observation station 4 is received, converted to the address code 24 when the paging signal was received, and retransmitted.

The monitoring station 10 receives this return signal because it is the same as the address code 24 when the call signal was transmitted.
Collect data. In this case, even if the return signal from the observation station 4 can be directly received, it is ignored because the address code is 04.

In other words, the monitoring station 10 and the relay observation station do not receive signals other than the address code transmitted by the own station. Although the above description has been given of the case of one-stage relay, for example, in the case of a two-stage relay of the observation station 1 and the observation station 2, and collecting data of the observation station 4, as shown in FIG. The address code of the calling signal is transmitted as 124, and the observation station 1
Then, 1 is converted to 0 and transmitted. Observation station 2 converts 2 to 0 and transmits. Observation station 4 returns the station address of the return signal as the received address code 004. Is received, the address code is converted into the same 024 as that received, and transmitted. The observation station 1 receives this, converts it into the same 124 as the received address code, and transmits it.

Then, the monitoring station 10 receives the address code of the return signal from the observation station 4 because it is the same as the address code 124 when the calling signal was transmitted. That is, the return signal from the observation station 4 is received via the observation stations 2 and 1.

Therefore, even if noise occurs in the propagation path,
Since reception is performed through another route, missing data can be eliminated even if continuous noise or the like occurs.

[0042]

As described in detail above, according to the present invention, even if continuous noise or the like occurs in the propagation path, transmission / reception is performed on another path, so that the effect of eliminating missing data can be eliminated. is there.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention,

FIG. 2 is a flowchart of a process of a monitoring station according to the embodiment of the present invention;

FIG. 3 is a flowchart of a process of the observation station according to the embodiment of the present invention;

FIG. 4 is a diagram showing address code conversion in the case of two-stage relay according to the embodiment of the present invention;

FIG. 5 is a block diagram of an example monitoring station;

FIG. 6 is a block diagram of an example observation station;

FIG. 7 is a diagram showing an example of a transmission format;

FIG. 8 is a flowchart of a process performed by a monitoring station in a conventional example;

FIG. 9 is a flowchart of a process performed by a conventional observation station.

[Explanation of symbols]

1-4 are observation stations, 10 is a monitoring station, 20 and 35 are press-talk switches, 21 and 36 are wireless devices, 22 and 37 are receivers, 23 and 38 are transmitters, 24 and 39 are CPUs,
Reference numerals 5 and 40 denote memories, 26 and 41 are receivers, 27 and 42 are transmitters, 28 and 43 are digital output units, 29 and 44 are digital input units, 30 is a clock, 31 is a printer output unit, and 32 is an external output. Reference numeral 33 denotes an operation device, and 34 denotes a printer.

Claims (1)

(57) [Claims] In a data collection system, a monitoring station (10) collects data from a plurality of observation stations (1, 2, 3, 4) by a polling method using a single wireless line. ) Is the same as when the first data transmission is commanded to the observation station (4) with the first code (0) added before the address (4) of the observation station as the address code and transmitted. If the signal of the address code (04) can be received within a predetermined time, the signal is received. If the signal cannot be received within the predetermined time, the address code is relayed before the address (4) of the observation station. Assuming that the address of the observing station (2) is attached, the data transmission is instructed, and the same address code as that transmitted (24)
The observation station (4) receives the signal of the address code in which the first code (0) is added before the address (4) of the observation station. Is received, the observation data with the same address code (04) as the address code is received is transmitted, and the signal of the address code in which the address of the own station is added before the address of the other station is transmitted. When input, it receives and converts the address of its own station into the first code (0) of the address code and transmits it. When the signal of the same address code as the transmitted one can be received within a predetermined time, it is received. A data code which is converted into an address code before conversion and transmitted.