JPS61262337A - Data collecting method - Google Patents

Abstract

PURPOSE:To reduce a collection time when the information of all data terminal equipment is to be collected by allowing a data terminal equipment to send a data after a prescribed time specified for each data terminal equipment from the reception of a polling sent from a master station. CONSTITUTION:A polling signal detection circuit 2 detecting a polling signal from a master station activates a timer circuit 3 setting in advance a different at every data terminal. When the timer circuit 3 reaches time-over, it is informed to an information transmission control circuit 4. The information transmission control circuit 4, through the said time-out notice, sends the information presenting that the own station address is set to the address part. For example, the polling signal from the master station is received by data terminal equipment A1-AN and sends the information representing that the own station address is set to the address part to the master station after a prescribed time elapses, that is, T1 for the data terminal equipment A1, T2 for the data terminal equipment A2, T3 for the data terminal equipment A3 and TN for the data terminal equipment AN.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a data collection method in which a master station receives data from data terminal devices connected in a multi-drop format such as a CATV system. .

[Conventional technology]

Conventionally, in a system for collecting data from a data terminal device connected to a master station in a multi-drop manner, the master station and the data terminal device are connected as shown in FIG. When the master station M receives data from the data terminal devices A1 to AN, the master station M sends a polling signal with the terminal address assigned to each data terminal device set in the address part, as shown in FIG. The data terminal device that transmitted the polling signal and received the polling signal transmitted information with its own address set in the address field.

[Problem that the invention seeks to solve]

However, in the data collection method described above, the master station M is 1
Since polling signals are sent out for each station, there is a problem in that it takes time to collect information on all data terminal devices A1 to AN.

[Means for solving problems]

In order to solve such problems, the present invention provides a data collection method in which a master station receives data from data terminal devices connected in a multi-drop manner. Data is transmitted from the data terminal device after a predetermined period of time specified for each data terminal device.

[Effect]

In the present invention, it is possible to shorten the collection time when attempting to collect information on all data terminal devices.

〔Example〕

An embodiment of the data collection method according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a data terminal device to which this method is applied, in which 1 is a transmission/reception interface circuit, 2 is a polling signal detection circuit, 3 is a timer circuit, and 4 is an information transmission control circuit.

Next, the operation of the data terminal device configured as described above will be explained. A polling signal received from a master station M shown in FIG. 3 is input to a polling signal circuit 2 via a transmitting/receiving interface circuit 1. The polling signal detection circuit 2 that has detected the polling signal from the master station operates the timer circuit 3 to operate a timer that is preset for a different time for each data terminal device. When the timer circuit 3 times out, it notifies the information transmission control circuit 4. In response to this notification, the information transmission control circuit 4 transmits information with its own address set in the address section.

These temporal relationships are shown in FIG. 2. As shown in FIG. 2, the polling signal from the master station is sent to the data terminal device A1
~AN, and after a certain period of time has elapsed, that is, Tl in the case of data terminal device A1, T2. in the case of data terminal device A2. In the case of data terminal device A3, T3. In the case of the data terminal device AN, after TN has elapsed, it transmits information with its own address set in the address field to the master station.

〔Effect of the invention〕

As explained above, the present invention collects information on all data terminal devices by transmitting data from the data terminal device after a certain period of time specified for each data terminal device after receiving a polling signal transmitted from the master station. This has the effect of shortening the collection time when attempting to do so.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing a data terminal device to which an embodiment of the data collection method according to the present invention is applied, Fig. 2 is an explanatory diagram for explaining its operation, and Fig. 3 is a general data collection method. FIG. 4, a system diagram showing the system, is an explanatory diagram for explaining a conventional data collection method. M...Master station, A1~AN...Data terminal device,
1... Transmission/reception interface circuit, 2... Polling signal detection circuit, 3... Timer circuit, 4...
・Information transmission control circuit.

Claims (1)

[Claims] In a data collection method in which a master station receives data from data terminal devices connected in a multi-drop configuration, after a certain period of time specified for each data terminal device from the time when a polling signal transmitted from the master station is received. A data collection method comprising transmitting data from the data terminal device.