JPS61214832A - Method and device for gathering dynamic information - Google Patents

Abstract

PURPOSE:To shorten data gathering time without requiring a complicated circuit by ranking individual slave stations by the variance of circuit operation time among them and allowing them to respond. CONSTITUTION:A master station 1 transmits continuously the commands of plural frames for general data gathering. When each of slave stations 2a-2n receives any command, a timer circuit 9 which holds temporarily the transmission of a response signal starts the operation. The timer circuit 9 is turned off when it is detected that the transmission of data information on a data transmission line 3 is terminated. One of slave stations 2a-2n which detects first this termination transmits the response signal simultaneously with turning- off of the timer circuit 9. Therefore, slave stations of slow circuit operation out of slave stations 2a-2n detect continuously data information transmission of slave stations in quick circuit operation and are held till the end of transmission of slave stations in quick circuit operation and transmit the response signal thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention is applicable to vehicles such as taxis and delivery vehicles, as well as sales personnel, etc., who are scattered within a certain area and whose positions and movements are completely irregular. The present invention relates to a dynamic information collection method and device that enables a master station to collect information on a large number of changing slave stations with simple operations and in a short time.

"Prior Art" When a master station collects dynamic information of all slave stations, a time slot method and a polling method are known.

Among these, the time slot method has a problem in that it requires a dedicated data transmission channel, and the polling method has a problem in that it takes too much time to collect data. For this reason, a system that combines a time slot system and a polling system is currently employed.

In this method, as shown in Fig. 8, when the master station emits a polling signal as shown in (a), the first slave station assigned the time slot (Lo to 1) as shown in (b) responds, and when this is completed, the second slave station assigned the time slot (ts~2) as shown in (c) responds, and hereafter, (72~3)...(tn , ~n) to prevent collisions caused by simultaneous calls.

"Problems to be Solved by the Invention" As described above, even with the combination of the time slot method and the polling method, when the number of slave stations is tens or hundreds, it takes a long time to collect dynamic information. Moreover, the master station requires a device that recognizes the time slots assigned to each slave station to prevent malfunctions, but this device is extremely expensive. Furthermore, if time slots are allocated in advance, there is a problem that the order of responses is fixed and becomes unequal.In order to solve this problem, the applicant has already developed a variable time slot system (Japanese Patent Publication No. 57-29095). However, there was still a problem that the equipment was expensive.

"Means for Solving the Problems" The present invention was made to solve the above-mentioned problems by transmitting data collection signals from 11 stations all at once to a plurality of slave stations via data transmission lines.

In a dynamic information transmission method in which a response signal of dynamic data is transmitted from each slave station to a master station, each slave station has a frame verification circuit that receives a simultaneous data collection command from the master station, and a frame verification circuit that receives a simultaneous data collection command from the master station. a timer circuit for holding a response signal that starts operating upon output; a reception data end detection circuit that detects that there is no mutual response signal between the master station and other slave stations on the data transmission line and stops the timer circuit; The apparatus includes a response signal activation circuit that activates a response signal at the same time as the timer circuit is turned off, and a transmission data processing circuit that transmits transmission data using the response signal activation circuit.

"Operation" The master station continuously transmits multiple frame commands for simultaneous data collection. When each slave station receives any command, a timer circuit that temporarily suspends response signal transmission starts operating.

It is constantly detected whether data information is no longer being transmitted on the data transmission line, and when this is detected, the timer circuit is turned off. The time to detect whether this data information is gone, and the timer circuit turns off,
The rise and fall times, etc. vary in the circuits of each slave station and also vary randomly for each slave station, so these variations and differences are used to rank each slave station.

That is, a slave station that detects early that data information is no longer being transmitted transmits a response signal at the same time as its timer circuit is turned off. Therefore, the slower slave station continuously detects the data information transmission of the earlier slave station, is held on hold until the earlier slave station completes its transmission, and then transmits a response signal.

"Example" An embodiment of the present invention will be described below with reference to the drawings.

In Figure 2, (1) is the master station, (2) ((2a) (
2b)-...(2n)) are slave stations, and these master station (1) and each slave station (2a) (?b)...(2n) are connected to each other by a wired data transmission line (3). has been done. A printer (4) is coupled to the master station (1). Also,
Each of the slave stations (2a), (2b), . . . (2n) is configured as shown in FIG. In this Figure 1, the data transmission line (3) is connected to an A/D (analog/digital) converter that transmits received data to the receiving side via a transmission/reception switching circuit (5).
a received data processing circuit (6) for converting is coupled;
On the output side of this circuit (6), there is a frame verification circuit (7) for detecting a simultaneous data collection command from the master station (1);
A received data end detection circuit (8) is coupled to detect the end of received data in the data transmission line (3). On the output side of these circuits (7) and (8), a response signal temporary suspension timer circuit (9) is activated by the output of the frame verification circuit (7) and reset by the output of the received data end detection circuit (8). ) are combined and this timer circuit (
The output side of 9) is connected to the transmission/reception switching circuit (5) via a response signal activation circuit (10) and a transmission data processing circuit (11). A transmission data input circuit (12) for storing the station number, dynamic data, etc. of the station itself is coupled.

The operation of the above configuration will be explained.

In the flowchart of Fig. 5, at 1 o'clock, the master station (1)
When the switch for simultaneous data collection is turned on, each slave station (2
Data for simultaneous data collection is continuously transmitted for five frames from the first block to the fifth block as shown in FIG. 3(a) toward a)(2b)...(2n).

As shown in FIG. 4, the synchronized data format from the master station (1) is as shown in FIG. - Consists of a command mode pit and a dynamic information collection bit.

When such a simultaneous data collection command from the master station (1) is sent to each slave station (2a) (2b)...(2n), each slave station (2a) (2b)...( 2n) Then, as shown in FIG. 7, do you receive the simultaneous data collection command? is judged. That is, in FIG. 1, when received through the transmission line (3), the signal from the master station (1) is A/D converted by the reception data processing circuit (6) and sent to the frame verification circuit (7). . Here, it is assumed that among the signals from the master station (1), the first block signal is detected only by the first slave station (2a) as shown in FIG. 3(b).

In this first slave station (2a), the frame verification circuit (7) outputs an output at the same time as 2 o'clock after the signal reception of the first block is completed, and at p 2 after the unique rising characteristic time, the timer circuit ( 9) starts. Then, the response signal is not transmitted immediately, but transmission of the response signal is temporarily suspended until there is no signal on the transmission line (3).

Next, the data of the second block from the master station (1) is transferred to the second block.
It is assumed that the received data is received by the second slave station (2b) and the third slave station (2c). Then, the timer circuit of each slave station (2b) (2c) (
9) (9) starts almost simultaneously. However, due to variations in the circuits and transmission lines, such as differences in the characteristics of the elements of the frame verification circuit and timer circuit and the rise and fall characteristics between the second and third slave stations (2b) (2c), , second
It is assumed that the timer circuit (9) of the slave station (2b) starts at 31:00, and the timer circuit (9) of the third slave station (2c) starts a little later than 32:00. Other slave stations (
Regarding 2d)...(2n), after detecting any of the signals of the first to fifth blocks, the respective timer circuits start sequentially with a time difference due to the characteristics of the circuits.

At L4 time when the data collection signal from the master station (1) disappears, the received data end detection circuit (8) of the first slave station (2a), which has the fastest operating characteristics, detects the end of data and the timer circuit (9 ) to reset. Then, the response signal activation circuit (10) is activated, and the data stored in the transmission data input circuit (12) is transferred to the transmission data processing circuit (11).
Processing such as D/A conversion is carried out at the main station (1) and the Kaneko other than the own station via the data transmission line (3). (2b)...(
2n). As shown in Figure 5, the data format of the response signal from the slave station (2a) is as follows: bit synchronization bit, frame synchronization bit, own station number bit, bit synchronization bit, followed by the first to fifth blocks. Each block consists of a frame synchronization bit, a local station number bit, and a dynamic information bit. This response signal from the first slave station (2a) is received by the master station (1) and printed out by the printer (4). When the first slave station (2a) finishes transmitting at time t5, the timer circuit (9) of the slave station (2b) that operates earliest among the remaining slave stations (2b)...(2n) is reset. , sends a response signal. This is also received by the master station (1) and printed out. This second slave station (2b)
At 6 o'clock, the third slave station (2c), which was further put on hold for transmission, resets its timer circuit (9) and transmits a response signal. Similarly, slave stations with fast operating characteristics (2
d)...Send response signals sequentially from (2n).

Note that when a signal collision occurs between a plurality of slave stations and there is no response, information is collected individually for the slave stations that have not responded, as shown in the flowchart of FIG. And has data collection been completed for all slave stations? When becomes YES, data collection ends.

"Effects of the Invention" As described above, the present invention actively utilizes the variation in circuit operation time of each slave station, and uses this variation to rank each slave station and make it respond.

Therefore, there is no need for a particularly complicated circuit for setting the response order, and since the order changes randomly each time the order is used, inequality is also eliminated. Moreover,
Since there is no need to provide time slots, data collection time can be greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the dynamic information collecting device according to the present invention, FIG. 2 is a block diagram showing a combined state of a master station and a slave station, and FIG. 3 is a block diagram showing the operation of the master station and slave stations. Time chart, Figure 4 is the format of the simultaneous data collection data of the master station, Figure 5 is the format of the response signal of the slave station, Figure 6 is the flowchart of the master station, Figure 7 is the flowchart of the slave station, Figure 8 is an explanatory diagram of a conventional combination method of a time slot method and a polling method. (1)... Master station, (2) ((2a) to (2n))
...Slave station, (3)...Data transmission line, (4)...
・Printer, (5)...Transmission/reception switching circuit, (6)...
Received data processing circuit, (7)...frame verification circuit,
(8)...Reception data end detection circuit, (9)...Timer circuit, (10)...Response signal activation circuit, (11)
. . . Transmission data processing circuit, (12) . . . Transmission data input circuit.

Claims (2)

[Claims] (1) In a method in which a master station transmits a data collection signal all at once to multiple slave stations, the master station receives response signals from each slave station that received the signal, and collects dynamic information signals from each slave station. , After each slave station receives the simultaneous data collection signal from the master station, it sequentially transmits response signals to the master station starting from the one that detected the end of data transmission between the master station and all slave stations earlier. A dynamic information collection method characterized by: (2) In a dynamic information collection device in which a master station transmits a data collection signal all at once to a plurality of slave stations via a data transmission line, and each slave station transmits a response signal of dynamic data to the master station, Each slave station has a frame verification circuit that receives the simultaneous data collection command from the master station, a timer circuit for suspending a response signal that starts operating based on the output of this frame verification circuit, and a data transmission line between the master station and other slave stations. a reception data end detection circuit that detects that there is no mutual response signal and stops the timer circuit; a response signal activation circuit that activates the response signal at the same time as the timer circuit is turned off; and a response signal activation circuit that activates the response signal. 1. A dynamic information collection device comprising a transmission data processing circuit for transmitting data.