JPS60186149A - Data communication system with variable transmission speed - Google Patents

Abstract

PURPOSE:To improve the data reception rate of signals from plural slave stations at a master station and to shorten a communication time by varying the transmission rate of signals from slave stations to the master station at the slave station sides during the data communication between the slave stations and master station. CONSTITUTION:A signal is modulated 12 with a polling signal with a constant transmission rate from the signal processor 11 of the master station and transmitted through radio equipment 13 as for the automatic vehicle position display system of taxi radio transmission. A taxi as a slave station receives the polling signal by radio equipment 23, and this is demodulated and inputted to a signal processor 21. The processor 21 operates switch groups 30A, 30B, and 30C according to the distance of the taxi from the master station and an area signal generating circuit 29 sends a signal with a transmission rate of, for example, 1,200, 600, or 300 baud according to short, intermediate, or long distance, the motion signal of the taxi from the taxi meter 27, and the car number to the processor 21. The processor 21 controls switches 25 and 26 to select one of modulators 241-24n according to the transmission rate, and sends the signals to the master station. The master station receives and stores 19 the signals, which are displayed on a display device 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for connecting one station, for example, a plurality of slave stations, and another station,
For example, it is related to the data communication method between the master station and the slave station, and by arbitrarily changing the transmission speed (baud rate) of the signal transmitted by the slave station, the data of the signal from the slave station at the master station can be changed. This aims to improve the reception rate and shorten the communication time between the master station and the slave stations.

For example, in the AVM (Automatic Vehicle Location Display) system of taxi radio, when data communication is performed between a master station, which is a base station, and a plurality of slave stations, which are mobile stations, at least transmission signals from the slave station to the master station are transmitted. Since the transmission speed (baud rate) of the baud rate is constant, when a slave station sends a signal at will, the master station can reliably receive the signal from the slave station located far away. A situation had arisen that made it impossible to do so.

However, in the present invention, the slave station arbitrarily changes the transmission rate (baud rate) of the signal sent to the master station. )
This is a transmission method that aims to improve the data reception rate at the master station, while setting a fast signal transmission speed (baud rate) for nearby slave stations to shorten communication time. Change the degree of transmission to iiJ and change the data communication method to 11y.
This is Tozuruchino.

Hereinafter, an embodiment of the GATA communication system according to the present invention will be described with reference to the drawings and notes.

First of all, as shown in Figure 1 for an example of the ffi area,
. , the range within 10 K n+ beyond this is set as region B, and the range further beyond that within 15 km is set as region C. Maruko, for convenience, divide the territory into two, call it districts AI and A2, and divide territory 1 or B into four,
Areas B1, B2, B3, and B4 are divided into eight areas, and the areas are called areas 01, C2, . . ., C8.

Next, in Figure 2, 11! A block diagram of station 1 and a block diagram of slave station 2 are shown in FIG. 3, respectively.

Master station 1 is a signal processing device consisting of a microcomputer, etc.)
! :Installation 11 and the present invention [2 are not directly related, but (
88 places 1! I! A baud link (i [!) with a constant transmission speed VO1 of, for example, 300 baud from the equipment The radio 4m13 for receiving the radio waves from the station 2 is the first transmission speed for transmitting the receiving J1 output from the radio 13 that received the radio waves from the slave station 2 or I. The first demodulation circuit 141 is suitable for V i <300 baud), and the second demodulation circuit 141 is suitable for transmission speed V2 <600 baud.
The second demodulation circuit 142 is suitable for the second demodulation circuit 142, which is suitable for the third transmission speed V3 (1200ilK > 2 transmissions). A suitable Nth demodulation circuit 14n, etc., 1st demodulation circuit 141, 142 .
143 , . . . following i 4 n, 117]
Demodulation circuit 14+, 142.143ko...i
4. Judgment circuits 154, 152, 153 for determining whether the demodulated signal from n is a stop 111 and outputting only genuine 41 "JJ signal S bow" to the signal processing circuit 11,
...1511, an input device 17 such as a hair bow 1 connected to the signal processing device 11, an output device 18 such as a cathode ray tube, and an external storage device 19. ing.

On the other hand, each slave station 2 receives radio waves from the master station 1, and also has a radio device 23 that outputs radio waves to the master station 1, and a fixed radio signal from the radio device 23, which is not directly related to the present invention. Transmission speed v
O1 includes a demodulation circuit 22 suitable for demodulating the received output of, for example, 3'00 baud, and a demodulation circuit 22 that processes the demodulated output from the demodulation circuit 22, and transmits it to the master station 1 (mainly for processing No. 8). The signal processing device 21 consists of a monitor, etc., and the signal processing device 21 has different signal transmission speeds (
A first modulation circuit 241 suitable for a first transmission rate v1 (300 baud) and a second transmission rate V2 (600 baud) which modulates an output signal having a baud rate of 1~). The second modulation circuit 242 and the third transmission rate V3 (
33rd modulation circuit 243 suitable for 1200 baud).
...Nth modulation circuit 2 suitable for Nth transmission speed Vn
4n and the modulation circuit 241.2 from the signal processing device 21 based on the modulation circuit switching means from the signal processing device 21.
42.243, . l! Fitting F? Based on the modulation circuit switching output from 21, the modulation circuit 2/II, 242.2/13, etc.
- A second modulation circuit switching means 26 for switching and connecting the modulated output from the 24n to the radio 23, and a dynamic γ-event of empty cars, actual cars, and forwarding to the signal processing device 21. For example, the taxi meter device 27 for inputting data, and the I/O to each slave station 2 for the processing device 18 for Mr. 11M.
The car number signal 8 generation circuit 28, which inputs the fixed number of MI1, that is, the car number number, and the signal processing device 21,
Areas Ai, A2, B1, B2 shown in Figure 1 with L
, B3, B4, C1, C2, . . . district signal generation circuit 29 for outputting district data corresponding to C8.
and a switch group 30 for specifying the district for the district signal generation circuit 21 and the signal transmission speed (baud rate) for the signal processing circuit 21.

This district designation switch group 30 that also serves as signal transmission speed setting includes switches 30Δ1, 30A2, and IMB1, B2, B3, corresponding to districts Δ1 and A2 shown in FIG.
Switches 30B1, 30B2.30B3 corresponding to B4
．． 30134, ground t, > ci, c- 2, ......Swissob-30G responding to C8 at evening j
1.30G2. ...30C8, switch 3.0/\iY has a signal transmission speed of 1200
The switch 3013 Iff sets the powder input speed of the signal to 600 baud, and the switch group 30C sets the signal transmission speed to 300 baud.

- In such a configuration, when the slave station 2 makes a call arbitrarily and sends its own car number and dynamic data, for example, to the master station 1 to register that there is an empty car in the state, first A crew member operates one of the switch groups 30 corresponding to district 1 where the slave station 2 is located.For example, if the district where the slave station 2 is located is
If you set it to 8, you would press switch 30 C8. This operation completes the 1st issue! The timer for signal transmission in 1iJ21 is switched, and the transmission rate of the signal transmitted to master station 1 becomes 300 baud. Also, switch 30
The first and second modulation circuit switching means 25 are activated by the modulation circuit switching output from the signal processing device 21 that has arrived at C8.
．． 26 is the first modulation-1 path 24 as shown in FIG.
1) selects the signal [31 first modulation circuit 241J
5J: Radio 1! ! 23 to the master station 1 (, Nita, J
L, Uj will be issued.

Here, an example of the tel signal transmitted from the slave station 2 to the master station 1 is shown in Fig. 4.
j) Pitch 1 to synchronization signal, frame l) synchronization signal, and 3"
4T is generated from dynamic codes such as vehicles, actual vehicles, forwarding, etc., ground 18 data, used data, and correction signals. kj number processing t
)! In 21, No. 1a for dynamic vehicles such as empty vehicles, actual vehicles, forwarding vehicles, etc. is the taxi meter device 27.
From there, the vehicle number data is manually generated by the vehicle quantity signal generation circuit 2 q
The 3rd signal is inputted from the hth signal, and the ground signal is inputted from the district signal generation circuit 29.

The radio wave transmitted from the slave station 2 is received by the radio 13 of the master station 1, and each demodulation circuit 1/11, "142, 143, . . .
. . . Each determination circuit 151.152.
153, . . . 15T1. Each judgment circuit 151 , '152.1 i'j3 , .
...15n has 14 demodulation circuits, 142.1/
13, .
1 will output the demodulated signal to the signal processing device 11 again, so Shinkyujo] 8! In the device 11, the car number and movement of the slave station 2 are displayed directly on the output device 18, or are stored in a storage circuit within the signal processing device 11 or an external storage device 19. By the way, even if the transmission speed of the signal from the slave station 2 is different from 300 baud, 600 baud, 1200 baud, the determination circuits 151, 152, 153, . . .
...15n is compatible with each ho rate, and determines whether the prefix 1-direction 1 path signal or the frame 1113 signal in the signal from slave station 2 is normal. Therefore, only demodulated signals determined to be normal are output to the signal processing device @11.

Furthermore, when slave station 2 located in area A1 makes a call by operating switch 30Δ1, the timer for signal transmission in processing unit 15 is switched and 1200 baud is specified as the signal transmission rate. At the same time, the first and second modulation circuit switching means 25 and 26 select the third modulation circuit 243 by the modulation circuit switching output from the signal processing device 21, so that the vehicle number data and district of the slave station 2 are The signal containing the f-ta, dynamic code is sent to the radio 23 at a transmission rate of 1200 baud.
It will be transmitted to the master station 1 via.

In this invention, in the present invention, the transmission speed of the signal that calls the master station 1 is arbitrarily changed on the slave station 2 side.In other words, the slave station 2 located close to the master station 1 is faster. The signal transmission speed is set, and the slave station 2 located at a long distance C1 from the master station 1 is configured to set a slow signal transmission speed. The signal transmission speed from 2 is slow, so the signal can be reliably received and processed, and the signal transmission speed from 2 to the slave station, which is located close to the station, is fast, so it takes a lot of time to transmit 1t8. This can be shortened to .

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of the communication area according to the present invention, Fig. 2 is a block diagram showing a master station, Fig. 3 is a block diagram showing a slave station, and Fig. 4 is a block diagram showing a master station. To the station (This is a diagram showing the structure of the signal to be sent. In the figure, 1...master station, 2...slave station, 11, 21...
Shinkai processing equipment, 12.24.1.242.243,・
...2411...Modulation circuit, 13.23...
Radio, 141.142.1/13.・・・・・・14
11.22... Demodulation circuit, 151.152.1/53
, 15n... Judgment circuit, 17... Input device, 18... Output device, 19... External storage device,
25.26...Switching means, 27...Taxi meter device, 28...Car number signal generation circuit, 29...District signal generation circuit, 30...Switch group. Patent applicant General Co., Ltd. Figure 1 Figure 3

Claims (1)

[Claims] (1) In a data communication system between one station and another station, the transmission speed of signals from one station to the other station is changed on the one station side. A data communication method with variable transmission speed characterized by: (2. In claim (1), a data communication system with variable transmission speed characterized in that one station is a plurality of slave stations and the other station is a master station. (3) Patent Claim (2): A data communication system with variable transmission speed, wherein each of the plurality of slave stations is provided with signal transmission speed switching means for switching the signal transmission speed.