KR100222780B1 - Data communication circuit in the home automation - Google Patents

Abstract

The present invention relates to a home automation system for connecting a wireless response device and a receiving end (Rx) of an image storage device from a transmitting end (Tx) of the home automation main body to serial data of a home automation main body, And buffering means so as not to be affected by mutual influences between the bodies.

Description

In the home automation system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission circuit in a home automation system (hereinafter referred to as "HA") and particularly relates to a data transmission circuit for communicating data between a storage device storing an image of a visitor and a wireless device, And more particularly, to a data communication circuit in a home automation system that enables data communication between modules that are close in distance in serial data communication between the modules.

Since the length of the serial data communication line between the HA main body and the telephone period is at least 2M to 50M in the conventional generation, many circuits have been used for serial data communication. In order to implement the unmanned security system, the length of the serial data communication line can be very long depending on the size of the apartment complex and the distance between each generation and the unmanned security system. Therefore, various circuits are used for data stability. In the conventional HA system, there is no module used for short-distance data communication between modules, and even if it is used, it is not used because of a complicated configuration and a problem of cost increase.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a circuit capable of performing stable data communication with a simple structure in data communication between a main body of a home automation system, an image storage device, and a wireless response device.

In order to achieve the above object, the present invention provides a home automation system, which connects a wireless response device and a receiving end (Rx) of an image storage device from a transmitting end (Tx) of a main body of a home automation system, And buffering means so as not to be influenced.

FIG. 1 is a circuit diagram according to an embodiment of the present invention; FIG.

FIG. 2 is an operational waveform diagram according to an embodiment of the present invention; FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram according to an embodiment of the present invention in which a wireless response device 102 and a receiving end Rx of an image storage device 104 are connected from a transmitting end Tx of a home automation main body 100 to an image storing device Resistors R1 and R2 are connected from the transmitting end Tx of the wireless response device 102 and the base of the PNP transistors Q1 and Q2 is connected from each of the resistors R1 and R2 A receiving end Rx of the emitter home automation body 100 of the transistors Q1 and Q2 is connected and a pull-up resistor R3 is connected to the receiving end Rx of the home automation body 100. [

FIG. 2 is an operation timing diagram according to an embodiment of the present invention, in which (2a) is a signal waveform of the transmitting terminal Tx and (2b) is an example of a signal waveform of the receiving terminal Rx.

1 and 2, serial data communication between the three modules of the home automation main body 100, the wireless response device 102, and the image storage device 104 is described. (Rx, Tx) of central processing units (CPUs) in each of the three modules is connected to the home automation main body 100 as a master and the image storage device 104, , And the wireless response device 102 become the first and second slaves. In the home automation main body 100, an ID is assigned to each module of the first and second slaves so that 3-byte transmission data is transmitted to the transmitting terminal Tx and 3-byte receiving data is transmitted to the receiving terminal Rx. The transmission baud rate (baud rate) is selected as 4800 bps. However, in the first and second slaves, data is transmitted to the home automation main body 100. When data is transmitted from the first slave, the second slave receives data from the second slave due to the influence of the transmitting terminal Tx of the second slave, It does not work. In order to solve this problem, it is specified that data can be transferred from either the image storage device 104 or the wireless response device 102 by the ID data by the home automation main body 100, Each of the emitters of the transistors Q1 and Q2 is connected through the pull-up resistor R3 so as to receive data from the image storage device 104 or the wireless response device 102 at the time Tx. When receiving the data designated and transmitted from any one of the image storage device 104 and the wireless response device 102, the other transistor is off, so that it is not influenced by other devices during data transfer, Even if the image storage device 104 or the wireless response device 102 is connected together with the home automation main body 100, the mutual influences are not affected by the configuration of the transistors Q1 and Q2. The data transmitted from the image storage device 104 or the wireless response device 102 is buffered in the transistors Q1 and Q2 and pulled up from the resistor R3 by the power source supplied from the power supply terminal Vcc, Data can be transmitted. The data is applied to the bases of the transistors Q1 and Q2 through the resistors R1 and R2 when the data is transmitted from the wireless response device 102 or the image storage device 104 as shown in the second example, The buffered signal passing through the transistors Q1 and Q2 is pulled up by the resistor R3 and input to the receiving end Rx of the home automation main body 100. [ On the other hand, in the home automation main body 100, in order to perform data communication with any one of the wireless response device 102 and the image storage device 104, the home automation main body 100 transmits the wireless response device 102 to the receiving end Rx of the corresponding module corresponding to any of the devices in the image storage device 104 so as to designate the communication with the home automation main body 100 and communicate with any one of the devices . Therefore, the data outputted through the wireless response device 102 or the image storage device 104 by inserting the transistors Q1 and Q2 in order to prevent the serial data bus from being affected by data communication with other modules is transmitted through the transistors Q1 and Q2, And the level of the transmission data is stabilized by the pull-up resistor R3.

As described above, since the serial data line between the main body, the wireless response device, and the image storage device is used in common, the serial data bus is inserted with the transistor to prevent the serial data bus from being affected by data communication with the other module, There is an advantage in that serial data between the main bodies can be operated without being influenced by each other.

Claims (1)

A serial data transmission circuit with a home automation main body 100 having a wireless response device 102 and an image storage device 104 is characterized in that the wireless response device 102 and the wireless communication device 100 are connected from the transmitting end Tx of the home automation main body 100, The receiving end Rx of the image storage device 104 is connected and the resistors R1 and R2 are connected from the transmitting end Tx of the image storing device 104 and the wireless response device 102, And R2 are connected to the bases of the transistors Q1 and Q2 and the receiving end Rx of the home automation body 100 is connected to the emitters of the transistors Q1 and Q2, Up resistor (R3) to the receiving end (Rx) of the data communication circuit.