JPS5825733A - Data transferring method - Google Patents

Abstract

PURPOSE:To reduce the number of wirings between a data input device and a machine mounted on a car and make a buffer memory or the like unnecessary, by inputting data to the main body of the machine mounted on the car as serial data synchronously with clocks used for data transmission. CONSTITUTION:In a data input device 4, punched holes on data cards are detected by, for example, light emitting diode groups L (L1-Ln) and phototransistor groups D (D1-Dn). A transmitting device 2 supplies clocks from an oscillating circuit 204 to a counter 401 of the input device 4 at, for example, the data transmission time, and the input device 4 sets n-number of output lines to ''1'' successively in a decoder 402, and light emitting diode groups L emit the light successively. Data read by phototransistor groups D is transferred to the transmitting device 2 through a signal line 61 and is transmitted from an antenna 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transfer method between an in-vehicle communication device or the like and a data input device.

A bus location system for the purpose of passenger service and operation management collects individual data about vehicles on the ground side by performing individual wireless data communication between onboard vehicles and on the ground at specific points. . On the vehicle side, it is necessary to input information to an on-board communication device (on-vehicle device), and the conventional method for doing so is to use a digital switch. This involves inputting a code corresponding to the desired information content into a digital switch by referring to a comparison table or the like. Therefore, incorrect settings or forgotten settings are common, and to compensate for this drawback, methods have been proposed in which data is input using an information medium such as a card. In this case, the data input device is often installed away from the vehicle-mounted device body in consideration of operability and confirmability. Therefore, there is a problem in that the number of wires between the main body and the data input device increases depending on the amount of information.

The present invention has been made in consideration of the above points.

An object of the present invention is to provide a method for easily realizing data transfer between a data input device and an on-vehicle device.

The present invention was made by focusing on the fact that data transfer from a data input device to an on-vehicle device is necessary only when transmitting data to the ground, and moreover, it is transmitted as serial data. The above object is achieved by transferring data serially in accordance with the transmission timing during transmission.

Next, an embodiment according to the present invention will be described using the drawings.

FIG. 1 shows the connection relationship of the on-vehicle equipment of this embodiment. The data input device 4 is installed separately from the vehicle-mounted device main body 2, and a cable 6 connects the two. Data contents 51 are written on the data card 5 for visual confirmation. Here, the destination and system number are shown as an example of the data necessary for the one-pass location system, but other information may be used. Also, on the data card, a binary decoder 52 corresponding to the data content 51 is displayed.
As such, it is perforated. The following explanation will be given by taking a binary data display method using punching as an example, but this is not intended to narrow the scope of application of the present invention.

The data content 51 of the data card 5 inserted into the data input device 4 is visible through the transparent window 41. Antenna 1 is connected to vehicle-mounted device main body 2 via cable 3.

FIG. 2 explains the circuit configuration of this embodiment.

In the data input device 4, a group of light emitting diodes, ~D11
The presence or absence of the perforation 52 on the data card 5 is detected by the phototransistor groups D1 to DIl.

When transmitting data, the in-vehicle device main body 2 receives the following information from the control circuit 201.
A control signal is output onto the signal line 63 to release the reset of the counter 401 and divide the clock output from the oscillation circuit 204 onto the signal line 62.

The output of the counter 401 is input to the decoder 402 and is 0
Only one of the book outputs is set to the "1" level. 1"
The level output turns on transistors Q and Q1 via resistors R11 to R1n. Therefore, current flows through the light emitting diodes D, ~D, corresponding to the turned-on transistors Q1 to Q1 via the resistors R1 to R3.
Emits light. The light is received by the phototransistors D, -DIl, generates a voltage across the load resistor KL, and transmits data to the vehicle-mounted device main body 2 via the buffer 403 as necessary. Every time a clock pulse is input to the counter 401, the output of the decoder 402 changes, and the corresponding data on the data card 5 is read.

Therefore, in the order of reading, the light emitting diodes L1 to L
1 and phototransistors D, ~D, may be arranged. The read data is input to the data switching circuit 203 via the signal line 61, modulated by the modulator 207, amplified by the amplifier 208, and output to the antenna 1.

When transmitting data, a data format as shown in FIG. 3 is normally used. In other words, synchronization characters 5YNC, parity pits P, etc.
Data transmission is performed by adding to I to DATAm. When transmitting data from the data input device 4, the control circuit 201 cancels the reset of the counter 401 to perform the data transfer, but when adding parity pits to the input data,
The oscillation circuit 204 is controlled to stop the clock transmission to the color/receiver 401 by one bit, and during this period, the output of the validity generator 202 is input to the modulator 207 via the switching circuit 203. The timing at this time is shown in FIG. A is an input to the counter 401, and C is a parity pit addition timing. The decoder output changes every clock pulse, and data is transferred bit by bit. For example, when parity pits are added every 8 bits, the clock is stopped at timing B8.

When the data transfer from the data input device 4 is completed in this manner, the control device 201 resets the counter 401 to initialize it.

206 is an input circuit for directly inputting data to the vehicle-mounted device main body 2, and data is transmitted via the switching circuit 203. Further, 205 is an oscillator.

As explained above, according to this embodiment, data can be serially transferred from the data input device 4 in accordance with the timing of the transmission clock during transmission, so that the wiring between the data input device 4 and the vehicle-mounted device main body 2 is The number of storage devices is reduced, and storage devices are also not required. Since the light emitting diodes L and L8 are not turned on while the counter 401 is still in the reset state, power consumption can be significantly reduced.

As described above, according to the present invention, since the data is transferred as serial data from the data input device at the time of transmission, the number of wires required is small, and data is transferred in synchronization with the transmission clock, so buffer memory, etc. is also required. Instead, the configuration of the vehicle-mounted device is simplified.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining an in-vehicle device according to an embodiment of the present invention, FIG. 2 is a diagram for explaining a circuit configuration of an embodiment according to the present invention, and FIG. 3 is a diagram for explaining an example of a transmission data format. 4 are diagrams for explaining the timing of parity bit addition.

Claims (1)

[Scope of Claims] 1. In an in-vehicle transmitter that serves as a data input device separate from the main body, when the in-vehicle transmitter is in a transmitting state and the data input to the data input device by a data recording medium is transmitted to the in-vehicle A data transfer method characterized by inputting data from a transmitting device to the vehicle-mounted device main body as serial data in synchronization with a clock used for data transmission. λ In the above clock, when adding a parity bit,
1. The data transfer method according to claim 1, wherein a pause period of 1) f is provided.