JP2001358795A - Interruption communications equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide interruption communications equipment which allows interruption communication to be immediately performed without waiting even during a long passage communication and the previous communication to be immediately restored after completing the interrupting communication. SOLUTION: In the case of interruption communication during normal communication, a transmitting side is provided with an interruption transmission data pointer 7, an interruption transmission data buffer 8 where interruption communication data are memorized and a transmission switching circuit 9, and a receiving side is provided with a reception switching circuit 14, an interruption reception data pointer 13 and an interruption reception data buffer 12. The transmission switching circuit and the reception switching circuit are switched with a code showing the start and the end of the interruption communication included in the interruption communication data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a start-stop synchronous interrupt communication apparatus for performing interrupt communication during normal communication.

[0002]

2. Description of the Related Art A conventional communication device is shown in FIG. FIG. 3 is a block diagram thereof, where 1 is a transmission data pointer,
2 is a transmission data buffer, 3 is a transmission-side start-stop synchronization communication circuit, 4 is a reception-side start-stop synchronization communication circuit, 5 is a reception data buffer, and 6 is a reception data pointer. In the transmission data buffer 2 and the reception data buffer 5, STX,
Normal communication data including A, B, C,..., Z, and ETX are stored in the memory. Note that the start-stop synchronous data communication shown in FIG. 3 is a well-known technique in general, and thus the description thereof is omitted here.

[0003]

In such a start-stop synchronous communication apparatus, short-term communication (for example, when the normal communication data in FIG. 3 is composed of STX, A, B, C, ETX) is performed. When performing interrupt communication, the communication time from the first STX to the last ETX is short.
Even if interrupt communication is performed after completion of these communications, responsiveness is not impaired, but long-length communications (for example, normal communication data in FIG. 3 is composed of STX, A, B, C,..., Z, ETX) In case (2), responsiveness is impaired due to the occurrence of a waiting time, which causes a problem particularly when it is desired to suddenly change the operation of the device by remote control. The present invention has been made in view of the above points, and aims to eliminate these disadvantages and to interrupt normal communication without requiring a waiting time even during long-length communication. The present invention is to provide an interrupt communication device configured to start interrupt communication and resume normal communication immediately after the end of the interrupt communication.

[0004]

Means for achieving the object is that, on the transmitting side, point data from a transmission data pointer is transmitted to a transmission data buffer in which communication data is normally stored and specified. The normal communication data is transmitted to a transmission-side start-stop synchronization communication circuit that performs serial communication by performing start-stop synchronization, and the reception-side reception-side reception-side serial data from the transmission-side start-stop synchronization communication circuit is received and received. Point data from a data pointer is transmitted to a reception data buffer in which normal communication data is stored, and in the start-stop synchronous communication device so that the received normal communication data is transmitted to a specified reception data buffer, When performing interrupt communication during normal communication, the transmitting side indicates the interrupt transmission data pointer and the start of interrupt communication. An interrupt transmission data buffer for storing interrupt communication data including a code and a code indicating the end of interrupt communication, a transmission switching circuit for switching communication data input to a transmission-side start-stop synchronous communication circuit, an interruption reception data pointer on a reception side, An interrupt reception data buffer that stores interrupt communication data and a reception switching circuit that switches communication data output from the reception start-stop synchronization communication circuit are provided. When an interrupt communication request occurs, the transmission switching circuit on the transmission side sets the transmission-side start-stop synchronization. Switching the communication data input to the communication circuit from the normal communication data from the transmission data buffer to the interrupt communication data from the interrupt transmission data buffer to interrupt the normal communication,
When a code indicating the end of interrupt communication is input to the transmission-side start-stop synchronization circuit, the communication data input to the transmission-side start-stop synchronization circuit is switched from interrupt communication data from the interrupt transmission data buffer to normal communication data from the transmission data buffer. If the communication data output from the reception start-stop synchronous communication circuit is a code indicating the start of interrupt communication, the reception switching circuit controls the communication output from the reception start asynchronous communication circuit. When the data is switched to be input to the interrupt reception data buffer and the interrupt communication data is received, and the communication data output from the reception-side start-stop synchronous communication circuit is a code indicating the end of the interrupt communication, the reception switching circuit sets the reception-side start-up synchronization circuit. The communication data output from the synchronous communication circuit is now input to the reception data buffer. Toggles Te an interrupt communication apparatus characterized by being adapted to receive normal communication data. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0005]

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, the same reference numerals as in FIG. 2 denote portions having the same configuration and function. In FIG. 1, 7 is an interrupt transmission data pointer, 8 is a code ESC indicating the start of interrupt communication and a code EO indicating the end of interrupt communication.
An interrupt transmission data buffer for storing interrupt communication data including T, 9 is a transmission switching circuit, 10 is a transmission-side start-stop synchronous communication circuit, 11 is a reception-side start-stop synchronous communication circuit, and 12 is a memory for received interrupt communication data. An interrupt reception data buffer 13 is an interrupt reception data pointer. The transmission switching circuit 9 switches communication data to be input to the transmission-side start-stop synchronous communication circuit 10. During normal communication, the transmission switching circuit 9 inputs normal communication data from the transmission data buffer 2 to the transmission-side start-stop synchronous communication circuit 10. Is generated, interrupt communication data is input from the interrupt transmission data buffer 8 to the transmission-side start-stop synchronous communication circuit 10. The reception switching circuit 14 switches communication data output from the reception-side start-stop synchronous communication circuit 11. The normal communication data output from the reception-side start-stop synchronous communication circuit 11 is input to the reception data buffer 15 during normal communication. If the communication data output from the receiving-side asynchronous communication circuit 11 is the code ESC indicating the start of interrupt communication, the communication data output from the receiving-side asynchronous communication circuit 11 is the code EOT indicating the end of interrupt communication. The interrupt communication data is input to the interrupt reception data buffer 12 until the time is reached.

During normal communication, normal communication data composed of STX, A, B, C,..., Z, ETX is stored in the transmission data buffer 2 as shown in FIG. The data are sequentially read out based on the data, and the transmission switching circuit 9, the transmission-side start-stop synchronous communication circuit
0, reception start-stop synchronous communication circuit 11, reception switching circuit 1
4, the data is sequentially written and stored in the reception data buffer 15 based on the point data from the reception data pointer 16. During interrupt communication, ESC, A1, B2, C3,.
0, EOT is stored in the memory, and sequentially read out based on the point data from the interrupt transmission data pointer 7, the transmission switching circuit 9, the transmission start-stop synchronous communication circuit 10, the reception start-stop synchronous communication. After passing through the circuit 11 and the reception switching circuit 14, the data is sequentially written and stored in the interrupt reception data buffer 12 based on the point data from the interrupt reception data pointer 13.

If an interrupt communication request occurs when the point data from the transmission data pointer 1 points to the normal communication data B in the transmission data buffer 2,
The communication data input to the transmission-side start-stop synchronous communication circuit 10 after being switched by the transmission switching circuit 9 becomes the interrupt communication data from the interrupt transmission data buffer 8, and the normal communication is interrupted. The interrupt communication data ESC, A1, B2, C3,..., Z0, EOT are stored in the interrupt reception data buffer 12 based on the data and the point data from the interrupt reception data pointer 13. When the code EOT indicating the end of the interrupt communication is input to the transmission-side start-stop synchronous communication circuit 10, the transmission switching circuit 9 is switched and the communication data input to the transmission-side start-stop synchronous communication circuit 10 is transmitted from the transmission data buffer 2. , And the remaining normal communication data B, C,..., Z, and ETX are transmitted based on the point data from the transmission data pointer 1. When the code EOT indicating the end of the interrupt communication is output from the reception-side asynchronous communication circuit 11, the reception switching circuit 14 switches the communication data output from the reception-side asynchronous communication circuit 11 to be input to the reception data buffer 15. Therefore, based on the point data from the reception data pointer 16, the remaining normal communication data B, C,..., Z, ETX are written to the reception data buffer 15 and stored.

[0008]

According to the present invention as described above,
Even during long text communication, normal communication can be interrupted and interrupted communication can be started without requiring a waiting time, and normal communication can be resumed immediately after interrupted communication, which is extremely useful in practical use. It is highly likely.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a conventional block diagram.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmission data pointer 2 transmission data buffer 3 transmission-side start-stop synchronization communication circuit 4 reception-side start-stop synchronization communication circuit 5 reception data buffer 6 reception data pointer 7 interrupt transmission data pointer 8 interrupt transmission data buffer 9 transmission switching circuit 10 transmission-side start-stop synchronization communication Circuit 11 Reception-side start-stop synchronous communication circuit 12 Interrupt reception data buffer 13 Interrupt reception data pointer 14 Reception switching circuit 15 Reception data buffer 16 Reception data pointer

Claims (1)

[Claims] 1. On the transmission side, point data from a transmission data pointer is transmitted to a transmission data buffer in which normal communication data is stored, and designated normal communication data performs start-stop synchronization and performs serial communication. The transmission data is transmitted to the start-stop synchronous communication circuit, and the reception side receives serial data from the transmission-side start-stop synchronous communication circuit at the reception-side start-stop synchronous communication circuit, and receives the point data from the reception data pointer, where the normal communication data is stored. In the start-stop synchronous communication device which is transmitted to a data buffer and the received normal communication data is transmitted to a designated reception data buffer, when interrupt communication is performed during normal communication, interrupt transmission data is transmitted on the transmission side. An interrupt including a pointer, a code indicating the start of interrupt communication, and a code indicating the end of interrupt communication An interrupt transmission data buffer for storing communication data, a transmission switching circuit for switching communication data input to a transmission side start-stop synchronous communication circuit, an interruption reception data pointer on the receiving side, an interruption reception data buffer for storing interruption communication data, A reception switching circuit for switching communication data output from the reception-side asynchronous communication circuit is provided. When an interrupt communication request is generated, the transmission switching circuit on the transmission side transmits communication data input to the transmission-side asynchronous communication circuit from the transmission data buffer. The normal communication data is switched to the interrupt communication data from the interrupt transmission data buffer to interrupt the normal communication, and when a code indicating the end of the interrupt communication is input to the transmission-side start-stop synchronization circuit, the code is input to the transmission-side start-stop synchronization circuit. Transfer communication data from interrupt transmission data buffer Switch from the interrupt communication data to the normal communication data from the transmission data buffer to resume the normal communication. On the receiving side, if the communication data output from the receiving-side start-stop synchronous communication circuit is a code indicating the start of the interrupt communication, receive the data. The switching circuit switches the communication data output from the reception start-stop synchronous communication circuit to be input to the interrupt reception data buffer, receives the interrupt communication data, and outputs the communication data output from the reception start-stop synchronous communication circuit to the interrupt communication. Interrupt communication characterized in that the reception switching circuit switches the communication data output from the reception start-stop synchronization communication circuit to the reception data buffer and receives the normal communication data if the code indicates the end. apparatus.