JPS60227546A - Polling equipment - Google Patents

Abstract

PURPOSE:To eliminate the need for a high speed and inexpensive transmission circuit by transmitting an input data at each character to a polling issued through scanning so as to make the period of polling constant. CONSTITUTION:A controller 1 of a terminal system using a polling equipment is provided with a transmission control section 2 and plural input devices 4 are connected by an interface cable 3. A polling 6 is issued in a predetermined interval and order from the control section 2 of the terminal system and a reply 7 is returned from the input device 4 to the polling 6. Then an input data series 8 generated by each input device 4 is formed, the period of polling is made constant, any high speed and inexpensive transmission circuit is not required and the series of the input data generated by the plural input devices 4 is reproduced by the controller 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a polling device, and particularly to an improvement in a procedure for inputting input data generated by a plurality of input devices into a control device when the control device is activated.

[Background of the invention]

Conventionally, as a procedure for input data generated by a plurality of input devices into a single control device upon activation of the control device, a transmission control section polls each input device in a predetermined order at regular intervals. In response to polling, each input device responds with no data or, when input data is present, transmits the input data in a block manner.

Since the control device stops polling while this block transmission is being performed, the input data generated by the other input devices during this time is taken into the control device in the order in which polling is issued. Therefore, even if input data is generated in the input device in the opposite order to the polling issue order, the input data occurrence order seen from the control device is the polling issue order.
The actual sequence of occurrence of input data cannot be reproduced. As a countermeasure to this problem, the transmission speed may be increased so that the data transmission is completed within the polling cycle, but the transmission circuit becomes expensive.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned conventional problems, and to provide an effect that allows a control device to reproduce the permutations of input data generated by a plurality of input devices without using a high-speed transmission control section. An object of the present invention is to provide a polling device having the following features.

[Summary of the invention]

A feature of the present invention is that input data is transmitted character by character in response to polling issued by scanning.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows the configuration of a terminal device using the present invention. A control device 1 has one transmission control section 2, and is connected to input devices 4 of a plurality of aNe through interface cables 3.

FIG. 2 shows the procedure of the present invention in the form of a time chart. The transmission control unit 2 issues polling 6 at predetermined intervals and in a predetermined order. The input device 4 of ae returns a response 7 to the poll.

If the input data permutation 8 occurring at the input device occurs as shown, in the first polling cycle the C input device returns the first character of the input data. The transmission control section 2 receives this and notifies the control device IK that the data of the C input device is number 1 in the permutation. On the next polling cycle, the C input device returns the second character of the input data. The C input device returns the first character of the input data. The transmission control section 2 receives these and notifies the control device 1 that the data of the C input device is the second in the permutation. Thereafter, the above-described procedure is repeated, and when the transmission control unit 2 receives a character indicating the end of data as a response from the input device, the data from the input device 4 is passed to the assembly control device 1.

According to this embodiment, there is an effect that the polling cycle becomes constant.

〔Effect of the invention〕

According to the present invention, since a one-character response is made to polling, the polling cycle can be made constant, an expensive high-speed transmission circuit is not required, and the permutation of input data generated by multiple input devices can be reproduced by the control device. effective.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a terminal system using a polling device, and FIG. 2 is a time chart showing a procedure performed by the polling device. 1: Control device, 2: Transmission control unit, 3: Interface cable, 4: Input device, 5: Input data sequence in the control device, 6: Polling issued by the transmission control unit, 7: Response of each input device, 8 : An input data permutation that occurs on an input device. talent f figure i Z figure

Claims (1)

[Claims] 13 In a polling device that performs data transmission between multiple input devices and a control device that multi-controls these input devices, in response to polling from the control device, the input device returns one character at a time without disturbing the polling cycle. A polling device that performs data transmission and is capable of detecting a data generation sequence between input devices.