JPH0423640A - Polling system in data transmission system - Google Patents

Abstract

PURPOSE:To simply connect/disconnect a terminal equipment to/from the system by adding a code representing enabled reply by a terminal equipment not registered to a part or all of a polling signal, providing a reply time slot of the unregistered terminal equipment and incorporating the unregistered terminal equipment to a polling period. CONSTITUTION:A code G representing it that an unregistered terminal equipment is able to be registered to a master station is added to a signal POL polled from the master station to a terminal equipment No.2. An unregistered terminal equipment No.n is added newly to a polling period and the terminal equipment number No.n receives a polling signal with unregistered terminal equipment calling function and does not immediately reply the signal but sends a reply signal to the master station after lapse of a reply time (R time) of a terminal equipment No.2 set in advance. The master station receiving this signal registers the terminal equipment No.n at that point of time and sends a polling signal to the terminal equipment No.n.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a polling method in a data transmission system.

As is well known, the polling method is a means for a master station called a central station or control station to sequentially and constantly check whether or not there is a data transmission request from each terminal device. It is.

When transmitting data using the polling method, the master station
The identification number of each terminal device to be polled is registered in advance, and the master station sequentially transmits polling signals to these registered terminal devices.

Such a polling method is also applied to mobile communication such as a car equipped with a terminal device.

rProblem to be Solved by the Invention J In the above-mentioned mobile communication, when performing data communication by polling, the mobile unit is not always in an area where it can communicate with the master station, so the master station It is necessary to transmit the boring signal to the terminal device in a timely manner, resulting in poor data transmission efficiency.

Furthermore, since the master station polls only registered terminal devices, this is not necessary when a new terminal device is added to these transmission paths or when a mobile terminal device is added to the communication area with the master station. Such terminal devices also need to be registered in advance with the master station.

In view of such technical problems, the present invention enables terminal devices to be easily connected and disconnected during data communication by polling. In particular, in the case of a mobile terminal device, if it is in the communication area with the master station, The purpose of this project is to provide a polling method that can efficiently transmit boring signals only when a new terminal device is added, and can also be incorporated into the polling cycle even when new terminal devices are added without having to be registered in advance with the master station. .

1 Means for Solving the Problem 1 In order to achieve the intended purpose, the present invention has a plurality of terminal devices connected to a master station, and when polling is performed between the master station and each terminal device, the master station In a polling method in which a boring signal is sent to a terminal device, and each terminal device returns data or a response (including no response) to the master station based on the corresponding boring signal, some or all of the boring signals may contain unregistered data. A code indicating that the terminal device can respond is added, and a response time slot for unregistered terminal devices is provided in addition to the response time slots for each of the above-mentioned terminal devices as response time slots to the boring signal. The feature is that while polling each terminal device, unregistered terminal devices are included in the polling cycle.

r Effect j In the case of the polling method according to the present invention, an unregistered terminal device can respond to some or all of the boring signals so that any terminal device that is not registered with the master station can respond to the master station. Add a code indicating that it is possible (hereinafter referred to as polling with unregistered terminal calling function).

After transmitting this boring signal with the unregistered terminal calling function, the master station waits for responses from each terminal device, including specific terminal devices and unregistered terminal devices, until it issues the next boring signal. Receive in parts.

With this method, while polling a specific terminal device, it is possible to efficiently register an unregistered terminal device with the master station and add it to the polling cycle.

Embodiment J An embodiment of the polling method according to the present invention will be described with reference to the drawings.

FIG. 1 shows the polling cycle in the present invention.

This polling cycle is a polling signal that calls a terminal device registered in advance in the master station, that is, a normal polling signal POL No. 1, POL No.
, 2, POL No., 3... and a boring signal POL-G Na for polling with an unregistered terminal calling function.
, 1, POL-G No. 2, POL-G 14o, 3
The polling cycle in combination with . . . and the normal polling signal POL Na, 1. P.O.
It consists of a polling cycle that is a combination of only L N(+, 2, POL No., 3...).

Polling with an unregistered terminal calling function polls a specific terminal device and also polls unregistered terminal devices.

FIG. 2 shows an example in which an unregistered terminal device newly joins the polling cycle.

In FIG. 2, for example, from the master station to the terminal device N002
A code G indicating that an unregistered terminal device can be registered with the master station is added to the polling signal POL.

In this example, terminal device No. 2 has no data to transmit to the master station or is not responding, and unregistered terminal device No. n newly joins the polling cycle, but at this time terminal device No. , n does not respond immediately upon receiving the boring signal with the unregistered terminal calling function, but rather waits for the preset response time (Rt
After i*e) has elapsed, a response signal is sent to the master station.

The master station that received this signal at that point
! + is registered, and a polling signal is sent to the terminal device iNo,n.

FIG. 3 shows an example in which there is data in a specific terminal device No. 12, but there is no new connection request for the polling cycle of an unregistered terminal device.

During a normal polling cycle, a particular terminal receives its own paging polling signal and, in response, sends back data or a response message.

However, when the master station issues a polling signal with an unregistered terminal calling function, it is required to receive a response not only from a specific terminal device but also from the unregistered terminal device within a fixed period of time on a time-sharing basis.

In such a case, the specific terminal device N002 can return a short response message within a certain period of time, but cannot return long data or the like within a certain period of time.

Therefore, when a specific terminal device N092 has transmission data, the terminal device N022 does not immediately send it back to the master station, but instead sends a short response message to the master station indicating only that there is transmission data. Send.

Upon receiving this message, the master station again issues a normal polling signal to this specific terminal device No. 2 and receives the data.

FIG. 4 shows an example in which a specific terminal device No. 2 has transmission data and one unregistered terminal device newly joins the polling cycle.

In this case, after a response is received from each terminal device to the master station, the master station sequentially performs normal polling on the terminal devices N002, No., and n.

FIGS. 5 and 6 show an example in which a plurality of unregistered terminal devices newly join the polling cycle.

In this case, each unregistered terminal device No., n, No., m responds to the polling signal with the unregistered terminal calling function at the same time, so a call collision occurs and the master station cannot correctly confirm the terminal device. Therefore, these terminal device No.
n and No-m are unregistered.

As mentioned above, in the normal case of registration,
A balling signal should be sent from the master station to each terminal device No., n, No-m, but in this case, this is not done because a call collision has occurred.

In such a case, each terminal device No., n, No., m is,
A registration error is recognized when a polling signal (registration completion data) cannot be received from the master station even after a preset time has elapsed.

Each terminal device No., n, No., m that recognized the registration error
After a preset time has elapsed in a random time domain, each terminal responds to the first received polling signal with a calling function for unregistered terminals, and is newly registered with the master station.

FIG. 7 shows an example in which a terminal device registered with the master station leaves the polling cycle.

In FIG. 7, for example, if registered terminal device No. 2 closes its station, or if it is mounted on a mobile body and moves away from the data communication area from the master station, there is no response to polling of its own station. It becomes a response.

When this non-response state is repeated a predetermined number of times or a random number of times, the master station cancels the registration of terminal device N092, advances the polling to terminal device No. 3, and further reduces the total number of polls.

1g8 and 9 show examples where not all terminal devices are registered in the master station.

As shown in FIGS. 8 and 9, when all terminal devices are not registered in the master station, as described above, only the code indicating that unregistered terminal devices can access the master station is sent to the polling signal. , or continue to send a polling signal that includes the temporarily set data terminal device numbers No. and S.

At this time, if there is a connection request from an unregistered terminal device to the master station, the master station registers the terminal device making the request and performs data transmission by polling according to the same procedure as described above.

As shown in FIGS. 10 and 11, the order of responses from multiple terminal devices after the polling signal with the unregistered terminal calling function is transmitted is that the response from the unregistered terminal device comes first, and the response from the registered terminal device comes first. may be followed by a response.

In this case, especially if a specific terminal device has data to be transmitted to the master station, it sends a response message to the master station in advance indicating that there is data to be transmitted as described in Figs. 3 and 4. There's no need.

That is, since the unregistered terminal device only needs to respond immediately after receiving the polling signal and register only the terminal number in the master station, the response time can be shortened.

After that, the specific terminal device transmits data to the master station without worrying about the data transmission time, and after the master station finishes receiving this data, it is sufficient to poll the unregistered terminal device that received the previous response.

r Effects of the Invention j As explained above, in a polling method in a data transmission system, the present invention adds a code indicating that an unregistered terminal device can respond to some or all of the polling signals, and As response time slots, in addition to the response time slots for each of the above-mentioned terminal devices, a response time slot for unregistered terminal devices is provided, and while polling each of the above-mentioned terminal devices, unregistered terminal devices are included in the polling cycle. .

Therefore, when using the polling method according to the present invention, not only can terminal devices be easily connected and disconnected, but even mobile terminal devices can be polled efficiently if they are within the communication range with the master station. In addition, when new terminal devices are added, they can be incorporated into the polling cycle without having to be registered in advance with the master station.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram illustrating the polling cycle in the polling method of the present invention, and FIGS. 2, 3, and 4 are each polling diagram when a single unregistered terminal device participates in the polling cycle in the polling method of the present invention. An explanatory diagram showing an example,
5 and 6 are explanatory diagrams showing each polling example when a plurality of unregistered terminal devices participate in the polling cycle in the polling method of the present invention, and FIG. 7 shows the polling cycle for registered terminal devices in the polling method of the present invention. FIGS. 8 and 9 are explanatory diagrams showing an example of the case where the terminal device is deleted from the master station, and FIGS. The figure is an explanatory diagram showing each polling example when an unregistered terminal device participates in the polling cycle in the polling method of the present invention. POL No., 1....Registered terminal device POL
No. 2...Registered terminal device POL No.
3....Registered terminal device No-n...
...Unregistered terminal device No. m...
...Unregistered terminal device POL-G No. 1...
... Polling signal with unregistered terminal calling function POL-G No, 2 ... Polling signal with unregistered terminal calling function POL-G No. 3 ... Polling signal with unregistered terminal calling function

Claims (1)

[Claims] A plurality of terminal devices are connected to a master station, and when polling is performed between the master station and each terminal device, the master station transmits a polling signal to each terminal device, and each terminal device transmits a polling signal to the terminal device based on the corresponding polling signal. In a polling method that returns data or responses (including no responses) to a station, a code indicating that an unregistered terminal device can respond is added to some or all of the polling signals, and a time limit for responding to the polling signal is added. In addition to the time slots for responses from each of the terminal devices, a time slot for responses from unregistered terminal devices is provided as a slot, and while polling each of the terminal devices, the unregistered terminal devices are included in the polling cycle. A polling method in a data transmission system.