JPS60134646A - Data transmission system - Google Patents

Abstract

PURPOSE:To enable data transmission to personal stations even they are in remote places by transmitting data sent from a center station to a local station and sending the data from the local station to a personal station by FM waves. CONSTITUTION:The center station 1 is provided with two sending systems, i.e. a system that performs data transmission from a sending section 1d by FM waves and a system that performs data transmission from a modulator section 1c through a signal line l1 using a lamp wire. The transmission frequency of the sending section 1d consists of four channels, and can send different data simultaneously to each personal station for each frequency. There are the center station for character type and for LED type. When sending a message to a specific personal station, the content is selected by a CPU and sent out from the center station 1 as a data signal. In this case, if the objective personal station is in remote place, the message can be transmitted through a local station 2 that acts as a repeater. If the objective station is near, transmission is made possible by receiving radio waves transmitted from the center station 1.

Description

[Detailed Description of the Invention] This invention relates to a data transmission system, and in particular, data sent from a center station is transmitted to a local station, and the local station further transmits data to a personal station using 1M waves. This makes it possible to transmit data to each personal station regardless of location.

The following will explain the embodiments shown in the drawings.

FIG. 1 shows a block diagram of a center station and a plurality of local stations that receive data from the center station. Here, the center station 1 is composed of a control section 1a, a modulator section 1b11c1, and a transmitting section 1d that transmits a modulated data signal. It is equipped with two transmission systems for transmitting data through signal lines 1 and 2 using electric power lines.

The transmission frequency of the transmitting section 1d is composed of four channels, and different data can be simultaneously transmitted to each personal station for each frequency. There are two types of center station 1: character type and LED type.
They are distinguished as shown in Figures (a) and (b). That is,
For the character type shown in (a), the signals from group 1 to group 4 transmitted in four channels are respectively start code, group, address, data 1, data 2, . . . Data 64, the last end code, and further data 1 to data 6
The codes up to 7I include codes from the start bit to the stop bits 1 to 1, to 7I, and to b.

On the other hand, data transmission between the center station 1 and the local station 2 uses the data format shown in FIG. In other words, (a) is transmission by radio waves, and (b) is a signal line! , to the local station. (c) shows data processing within the center station, and when data is being transmitted to the center or to a local station, the transmission data R
AM should not be rewritten.

The control block 1a includes a computer unit (
For example, a personal computer (called a CPU) stores pre-programmed data and data for personal station registration and management. data is sent to the control block 1a.

The data signals sent out through the signal line II are received by a plurality of local stations 2, amplified there, and have a function as a repeater for further sending out data signals to personal stations.

The local station 2 includes an amplifier 2a1 that amplifies the data signal transmitted from the center station 1 through the signal line 11, a noise removal filter 2b, and a control block that reorganizes the signal data transmitted from the center station 1 into a transmission data RAM. 2c, a modulator 2d that modulates the data signal, and a transmitter 2e that transmits the data to the personal station.The reorganized data is then transmitted together with the transmitter of the printer station 1. It's Nishide. Note that this transmission format is the same as that of the center station 1.

FIG. 2 is a block diagram of an LED type personal station, which includes a demodulator 3a that demodulates the received signal and sends it out as serial data, and a demodulator 3a that is activated when the serial data is obtained and there is data at the address of the local station. It has a control block 3b that sends out signals. 3e is a control program that controls L at the specified location by the specified drive signal of the J-tsuku.
3f is a buzzer that generates a signal sound when used in conjunction with the display section 3e; 3C is an address switching section; 3
A switch d is used to stop driving the display section 3e.

This LED type uses five LEDs, and five types of messages can be transmitted depending on the lighting position.

Fig. 3 is a block diagram of a personal station of Kir17 type, which includes a demodulator 4a that demodulates the received signal and sends it out as serial data, and a demodulator 4a that demodulates the received signal and sends it out as serial data. The liquid crystal display section 4 has a control block 4b that sends a drive signal to the LCD panel 4, and uses this drive signal to display a dot matrix display.
d is connected via its controller 4C. Note that 4e is an address switching section of the control block 4b;
4f is a switch having a function of stopping driving of the liquid crystal display section 4d and shifting the display.

In the LFD type, the message 4- is displayed by its lighting, but in the character type, the message is displayed in text, and the content of the message can be made clear by shifting the display content.

Therefore, according to this system, when sending a message to a specific personal station, the content is selected from CPjJ and sent from the center station 1 as a data signal. In this case, the target personal station can transmit the message via the local station 2 that acts as a repeater at a remote location, while at a nearby location it can receive the radio waves transmitted from the center station 1. transmission is possible.

As described above, since this invention allows messages to be transmitted between a center station and a personal station directly or via a local station serving as a relay station, it has the advantage that necessary messages can be transmitted reliably. There is.

Especially when the center station and personal station are far apart,
We installed multiple local stations that receive data transmitted using signal lines and transmit that data via radio waves.
Reliable transmission and high reliability can be achieved.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the main part of this invention, Figs. 2 and 3 are block diagrams of a personal station, Fig. 4 is a data format from the center station to the personal station, and Fig. 5 is a block diagram from the center station to the local station. This shows the data format for . 1: Center Bureau 2 Local Bureau 3: Personal Bureau 4: Personal Bureau Patent applicant Harumi Uno, patent attorney representing Kagaku Giken Co., Ltd.

Claims (1)

[Claims] In a data transmission system that transmits data from a center station to a personal station located far away, there is a transmission system that transmits the data signal of the center station using radio waves, and a transmission system that transmits the data signal of the center station via a signal line using electric power lines. What is claimed is: 1. A data transmission system comprising two transmission systems: a transmission system for transmitting data to a local station, and a transmission system for transmitting from the local station via radio waves.