JPH05227250A - Data transmission system and its equipment - Google Patents

Abstract

PURPOSE:To provide the data transmission system and its equipment with remarkably improved flexibility in which a hexadecimal number and an internal decimal number are freely sent by obtaining an information signal to be sent and a transmission control character signal through the coding of voltages of opposite polarity to each other. CONSTITUTION:A sender side receives a transmission control character signal resulting from coding a voltage of the same polarity as a voltage of an information signal to be sent, a signal inversion section 2 inverts the polarity and couples the signal with the information signal to be sent at a signal coupling section and the result is sent. The receiver side receives a reception signal including the information to be sent and the transmission control character used for the transmission control resulting from coding voltages of opposite polarity with respect to a reference value and uses a signal separate section 3 to separate the reception signal into the information signal to be sent and the transmission control character signal. The polarity of the transmission control character signal is inverted by a signal polarity decoding section 4 and the resulting signal is used for the transmission control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system and its device.

[0002]

2. Description of the Related Art In a conventional data transmission system, a transmission signal encodes a voltage in only one direction with respect to a reference value.

That is, as shown in the waveform diagram of FIG. 3, the voltage in only the + direction is encoded with respect to the reference value 10.
In FIG. 3, the information to be transmitted is 1732C0 (H).
(The data display is 16 as shown as (H).
It is represented by a decimal number), and in order to transmit this, it is necessary to add a transmission control character for transmission control. STX (start of tex) that indicates the beginning of the text
t), SA (station address) indicating the transfer destination to be transmitted
), UA (unit address) before the information to be transmitted, and ETB (end of trans) indicating the end of the block.
mission block) is added later. This is the transmitted signal 9 in FIG.

[0004]

In the above conventional data transmission method, for example, as shown in FIG. 3, 17 (H) in the information to be transmitted is the code 17 (H) of the transmission control character ETB. ET on the receiving side
B, that is, it is processed as the end of the block, and there is a drawback that the information to be transmitted is not normally recognized by the receiving side.

In order to prevent this drawback, in the conventional data transmission system, the code used for the transmission control character is specified, and the code is restricted so that it cannot be used in the information to be transmitted. In this case, there are no problems with alphanumeric characters, alphanumeric characters, kana characters, etc., but since hexadecimal numbers and internal decimal numbers may match the code of the transmission control character as described above, when using them However, there is a drawback that special processing such as using a special code for the information signal to be transmitted must be performed.

An object of the present invention is to be extremely flexible in that hexadecimal numbers and internal decimal numbers can be freely transmitted by encoding voltages having opposite polarities to the information signal to be transmitted and the transmission control character signal. An object is to provide an improved data transmission system and device.

[0007]

A data transmission method of the first invention is configured by encoding voltages to be transmitted and transmission control characters used for transmission control, with voltages having polarities opposite to each other with respect to a reference value. To be done.

The data transmission apparatus of the second invention is supplied with the information signal to be transmitted and the transmission control character signal in which the voltage having the opposite polarity to the information signal to be transmitted with respect to the reference value is encoded. It is configured to include signal combining means for combining to create a transmission signal.

In the data transmitting apparatus of the third invention, the information to be transmitted with respect to the reference value and the transmission control character used for the transmission control are transmitted by encoding voltages having polarities opposite to each other with respect to the reference value. And a signal separation means for separating the information signal to be transmitted and the transmission control character signal by receiving the received reception signal.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a data transmission apparatus of the present invention.

FIG. 2 is a waveform diagram showing an example of the waveform of the code used in the data transmission system of the present invention and the apparatus thereof.

As shown in FIG. 1, the data transmission apparatus of the present embodiment has a communication control unit 6 for generating a transmission control character in which a voltage having the same polarity as that of information to be transmitted is encoded, and a parity bit of a transmission control character. A line adapter unit 5 that performs addition and parity check, a signal polarity reversal unit 2 that inverts the polarity of the transmission control character signal, and a signal that creates a transmission signal by combining the information signal to be transmitted and the transmission control character signal. The information signal to be transmitted upon receiving the supply of the reception signal transmitted by the coupling unit 1, the information to be transmitted and the transmission control character used for transmission control being encoded with voltages having polarities opposite to each other with respect to the reference value. And a signal separation unit 3 for separating the transmission control character signal and a signal polarity restoration for inverting the polarity of the transmission control character signal to restore the same polarity as the information signal to be transmitted It is configured to include a 4.

First, the polarities of information and the like used in this embodiment will be described with reference to FIG. In this embodiment, FIG.
As shown in, the data 21 that is the information to be transmitted.
(17 (H)), data 22 (32 (H)) and data 23 (C0 (H)) are + with respect to the voltage reference value 10.
While the voltage in the (positive direction) is encoded, the transmission control characters STX (02 (H)) and SA (0
1 (H)), UA (01 (H)) and ETB (17
(H)) and the like have the opposite polarity to the information to be transmitted, that is, the voltage of − (negative direction) is encoded with respect to the reference value 10 of the voltage, and the information to be transmitted and the transmission control character Is differentiated from.

Next, the operation of this embodiment will be described first with reference to FIGS. 1 and 3 on the transmitting side.

The communication control unit 6 transmits an information signal (1732C0 (H)) to be transmitted via the bus 7 and a transmission control character signal (STX, SA, UA, ET) for the information signal.
B) is supplied to the line adapter section 5 via the bus 8. The sign supplied here has the same polarity with respect to the reference voltage value and is in the + direction (this means that the conventional communication control unit is used).

The line adapter section 5 adds start / stop bits, parity bits, etc., as necessary, and supplies the information signal to be transmitted to the signal combining section 1 and the transmission control character signal to the signal polarity inverting section 2 ( The start / stop bit and the parity bit are omitted in the waveform diagram of FIG. 2).

The signal polarity reversing unit 2 inverts the voltage polarity of the supplied transmission control character signal from + to − and supplies it to the signal combining unit 1. That is, here, the polarity of the transmission control character signal is opposite to the polarity of the information signal to be transmitted.

In the signal combination unit 1, the information signals to be transmitted and the transmission control character signal, which are supplied in opposite polarities, are arranged and coupled at a predetermined position, and the waveforms as shown in FIG. 2 are transmitted as a series of serial signals. Create a signal.

Next, the receiving side will be described.

Information to be transmitted and a transmission control character used for transmission control as shown in FIG. 2 are encoded by voltages having polarities opposite to each other with respect to a reference value, and a signal separation unit 3 which receives a reception signal transmitted. Separates the information signal to be transmitted from the transmission control character signal, supplies the information signal to be transmitted to the line adapter section 5, and supplies the transmission control character signal to the signal polarity restoration section 4.

The signal polarity restoring unit 4 which has been supplied with the transmission control character signal inverts its polarity to restore the same polarity as the information signal to be transmitted and supplies it to the line adapter unit 5.

In the line adapter section 5, after performing a parity check, an overrun and other communication error checks, an information signal to be transmitted via the bus 7 and a transmission control character signal via the bus 8 are respectively transmitted to the communication control section. 6
Supply to.

The communication control unit 6 can perform a predetermined transmission control process by a transmission control character signal separated from the information signal to be transmitted, and the separated information signal to be transmitted is a transmission control character and a code. Are identical but are not used here for transmission control.

In the present embodiment, the communication control unit 6 encodes the transmission control character signal with a voltage having the same polarity as that of the information signal to be transmitted, and the reception side controls the transmission with such a signal. If the communication control unit 6 generates a transmission control character signal in which a voltage having a polarity opposite to that of the information signal to be transmitted is encoded and the transmission control is performed by the signal on the receiving side, the signal of the present embodiment. The polarity reversing unit 2 and the signal polarity restoring unit 4 are unnecessary. This corresponds to claims 2 and 4.

[0026]

As described above, according to the data transmission system and the apparatus thereof of the present invention, the information to be transmitted and the transmission control character used for the transmission control encode the voltages having the polarities opposite to each other with respect to the reference value. When converted and transmitted, even the same code as the transmission control character can be used for the information to be transmitted and transmitted, and the flexibility can be significantly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a data transmission device of the present invention.

FIG. 2 is a waveform diagram showing an example of a transmission signal in the data transmission system of the present embodiment and its device.

FIG. 3 is a waveform diagram showing an example of a transmission signal of a conventional data transmission system.

[Explanation of symbols]

 1 signal combining unit 2 signal polarity reversing unit 3 signal separating unit 4 signal polarity restoring unit 5 line adapter unit 6 communication control unit 7 and 8 bus 9 transmission signal 10 reference value

Claims (6)

[Claims] 1. A data transmission method, wherein information to be transmitted and a transmission control character used for transmission control are transmitted by encoding voltages having polarities opposite to each other with respect to a reference value. 2. A transmission signal is generated by receiving a supply of a transmission control character signal, which is a voltage having a polarity opposite to that of an information signal to be transmitted with respect to a reference value, and the information signal to be transmitted, and combining these. A data transmission device comprising a signal coupling means for performing the same. 3. A signal polarity inverting means for receiving a supply of a transmission control character signal encoding a voltage having the same polarity as an information signal to be transmitted with respect to a reference value and creating a transmission control character signal having the polarity inverted. And a signal combining means for receiving the information signal to be transmitted and the transmission control character signal of which the polarity is inverted to combine the information signals to create a transmission signal. 4. An information signal to be transmitted upon receiving a supply of a reception signal transmitted by encoding voltages having polarities opposite to each other with respect to the information to be transmitted and a transmission control character used for transmission control. And a signal separating means for separating the transmission control character signal. 5. An information signal to be transmitted by receiving a received signal transmitted by encoding voltages having polarities opposite to each other with respect to information to be transmitted and a transmission control character used for transmission control. And data transmission control character signals, and signal recovery means for separating the transmission control character signals, and polarity recovery means for receiving and supplying the separated transmission control character signals to invert and restore the voltage polarity of the signals. apparatus. 6. A data transmission system comprising the data transmission device according to claim 2 or 3 and the data transmission device according to claim 4 or 5.