KR100207721B1 - Data corresponding apparatus using fm modulation/demodulation method in unmanned guard system of group house - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication apparatus using an FM modulation method between a management room device and a security room device in an unmanned security system of a collective house, the data being started by a predetermined switching control signal and transmitted by a predetermined reset signal. The communication apparatus using the FM modulation method between the management room device and the guard room device, each having a microcomputer for receiving the signal, comprises: an FM modulator for modulating and outputting a TTL signal output from the transmitting microcomputer into an AMI signal; And an FM demodulator for receiving a modulated AMI signal, demodulating the initial TTL signal, and outputting the demodulated AMI signal to a receiving side microcomputer.

Therefore, according to the present invention as described above, even if the communication distance is far, the accurate data transmission and reception is possible.

Description

Data communication device using FM modulation / demodulation method of unmanned security system for apartment.

The present invention relates to a data communication apparatus of an unmanned security system for a multi-family house, and more particularly, to a data communication apparatus using an FM modulation and demodulation method in data communication between a management room device and a guard room device of a multi-family unmanned security system.

The multi-family unmanned security system allocates channels by processing the signals output through the multiple controllers, and the controllers that manage household devices installed in each house of each building of the apartment. Management room equipment to be loaded and transmitted, security room equipment for management equipment connected to the management room equipment, security room equipment installed in the security room that controls the access of external visitors and manages households and connected to the same controller, and common entrance equipment installed at the entrance of each building, etc. Is done.

In the case of data communication between the management room device and the guard room device of the collective unmanned security system configured as described above, in the conventional case, amplify the TTL signal output from the microcomputer and load it on the transmission path and receive the data transmitted through the transmission path. Use In this case, since a transmission path uses a general line such as a telephone line, an error signal is generated when the transmission distance is far, which makes it difficult to receive a complete transmission signal.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a data communication apparatus using an FM modulation / demodulation method in communication between a management room device and a security room device of an unmanned security system of a collective house.

1 is a view illustrating a data communication apparatus using the FM modulation method according to the present invention in a communication method between a management room device and a guard room device of a multi-family unmanned security system.

FIG. 2 is a diagram illustrating a detailed configuration of the FM modulator shown in FIG. 1.

3 is a diagram illustrating a detailed configuration of the FM demodulator shown in FIG. 1.

4 is a view for explaining a preferred embodiment according to the present invention.

In the unmanned security system for a multi-family house according to the present invention for achieving the above object, a management room each having a microcomputer that starts transmission by a predetermined switching control signal and receives data transmitted by a predetermined reset signal. A data communication apparatus using an FM modulation / demodulation method between a device and a guard room device includes: an FM modulator for modulating and outputting a TTL signal output from a transmitting side microcomputer into an AMI signal; and a modulated AMI signal corresponding to the FM modulator. It is preferable to include an FM demodulation unit for receiving and demodulating the initial TTL signal and outputting the demodulated signal to the receiving microcomputer.

In the present invention, in the case of data communication from the management room device to the guard room device, the data communication device using the FM modulation / demodulation method further comprises a frequency block converter for adjusting the transmission frequency band up.

In the present invention, the data communication path from the management room device to the guard room device is characterized by using a coaxial cable.

In the present invention, the FM modulator is an inverter for inverting the signal output through the TX terminal of the transmission side microcomputer, a transmission signal size adjusting unit for adjusting the inverted signal output from the inverter to a size suitable for FM transmission; An AMI signal converter for converting the signal output from the signal size adjusting unit into an AMI signal suitable for transmission, an FM transmitter for inputting the AMI signal output from the AMI signal converter and converting the signal into an FM transmission frequency; And a band pass filter for passing only a band of a transmission signal carried on the FM transmission frequency output from the FM transmitter and outputting the band to the transmission path.

In the present invention, the FM modulator is a switching control unit for intermitting the FM transmission signal so that only a desired transmission signal is output to the coaxial cable; and an impedance matching unit connected to a rear end of the switching control unit to reduce the return loss of the FM transmission signal. It further comprises.

In the present invention, the FM demodulation unit is a band pass filter for passing only the transmission band signal of the signal received through the coaxial cable, FM receiver for demodulating only the AMI signal of the initial transmission by inputting the signal passed through the band pass filter A low pass filter for filtering the AMI signal output from the FM receiver; a non-inverting amplifier for modifying the signal passing through the low pass filter; comparing the signal output from the non-inverting amplifier with a predetermined reference signal A comparator for outputting a TTL signal; And an inverter inverting the signal output from the comparator and outputting the complete TTL signal.

In the present invention, the FM demodulator further comprises a comparator reset unit for initializing the output of the comparator to prevent malfunction of the comparator.

In the present invention, the switching control unit transmits data only when the switching control signal is high.

In the present invention, the switching control unit and diodes connected in a reverse direction from a predetermined node. And a resistor and a capacitor connected in series between the predetermined node and ground.

In the present invention, the resistor and the capacitor is a protective element that prevents the diodes from being turned on due to ambient noise, even if the switching control signal is not input.

In the present invention, the comparator reset unit is connected to a predetermined node at the rear end of the comparator, a collector terminal connected to the node, a base terminal connected to the COM-RESET terminal side, and an emitter terminal connected to the ground side, It characterized in that it comprises a resistor and a capacitor connected in parallel between the base terminal and the COM-RESET terminal.

In the present invention, the resistor and the capacitor are characterized in that the active element for removing noise used to prevent the transistor is turned on by the noise.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail.

1 is a view illustrating a data communication apparatus using the FM modulation method according to the present invention in a communication method between a management room device and a guard room device of a multi-family unmanned security system.

In the apparatus shown in FIG. 1, reference numeral 10 denotes a guard room device, reference numeral 12 denotes a management room device, and reference numeral 14 denotes a coaxial cable, which is a data communication path between the guard room device 10 and the management room device 12, respectively.

The guard room device 10 inputs a switching control signal to output a signal to be transmitted through the TX terminal, and outputs a signal output through the TX terminal of the microcomputer 102 and the microcomputer 102 to input a signal received through the RX terminal. FM demodulates the received signal transmitted from the management room device 12 through the FM modulator 104 and the coaxial cable 14 and outputs the FM modulation to the coaxial cable 14 and transmits to the coaxial cable (12). And an FM demodulation unit 106 output to the RX terminal.

The management room device 12 inputs a switching control signal to output a signal to be transmitted through the TX terminal, and a transmission output through the TX terminal of the microcomputer 122 and the microcomputer 122 to input a signal to be received through the RX terminal. FM modulator 126 for FM modulation and outputting the signal, frequency block converter 128 and coaxial cable 14 for converting the frequency block of the signal modulated by the FM modulator 126 and outputting the same to the coaxial cable 14. And an FM demodulator 124 for FM demodulating the received signal transmitted from the guard room device 10 and outputting the received signal to the RX terminal of the microcomputer 122. Here, the frequency block converter 128 may be configured as an independent circuit without being included in the management room device 12. In a preferred embodiment according to the present invention will be described a case consisting of an independent circuit.

2 is a view showing a detailed configuration of the FM modulator 104, 126 shown in Figure 1, the operation of the FM modulator 104, 126 included in the guard room device 10 and the management room device 12 The same will be described with reference to the configuration of the elements around the FM modulator 126 of the management room device 12 as the same.

An inverter 1262 for inverting the signal output through the TX terminal of the microcomputer 122, a transmission signal size adjusting unit 1264 for adjusting the inverted signal output from the inverter 1262 to a size suitable for FM transmission, and a transmission signal size adjusting unit AMI signal conversion unit 1266 and AMI signal conversion unit 1266 for converting the signal output from the (1264) into an AMI (Alternative Mark Inversion) signal suitable for transmission, and converts it to the transmission FM carrier frequency And a band pass filter 1270 for passing only the band of the transmission signal output from the FM transmitter 1268 and the FM transmitter 1268, that is, the transmission signal carried on the FM carrier frequency, and outputting the same to the coaxial cable 14. Here, the switching control unit 1272 for controlling the FM transmission signal so that only the desired transmission signal is output to the coaxial cable 14, and further includes an impedance matching unit for reducing the return loss.

The frequency block converter 128 converts a signal modulated from the FM modulator 126 into an uplink frequency band for easy transmission and transmits the data from the management room device 12 to the guard room device 10 to the coaxial cable 14. Output

FIG. 3 is a diagram showing a detailed configuration of the FM demodulator 106 and 124 shown in FIG. 1, and the operation of the FM modulator 106 and 124 included in the guard room device 10 and the management room device 12. The same will be described with reference to the configuration of the elements around the FM modulator 124 of the management room device 12 as the same.

A bandpass filter 1242 for filtering only a reception band of a signal received through the coaxial cable 14, an FM receiver 1244 for inputting a signal passed through the bandpass filter 1242 to demodulate an AMI signal at the beginning of transmission; Low-pass filter 1246 for filtering the AMI signal output from the FM receiver 1244, non-inverting amplifier 1248 for transforming the signal passed through the low-pass filter 1246, the signal output from the non-inverting amplifier 1248 And a comparator 1250 for comparing the predetermined reference signal and outputting a TTL signal, and an inverter 1252 for inverting the signal output from the comparator 1250 and outputting the complete TTL signal. Here, the apparatus further includes a comparator reset unit 1254 for initializing the output of the comparator 1250 to prevent a malfunction of the comparator 1250.

4 is a view for explaining a preferred embodiment according to the present invention, a view for explaining a data transmission apparatus using the FM modulation and demodulation method from the management room device 12 to the guard room device 10 in the multi-family unmanned security system. In this embodiment, the case where the frequency converter converter 128 is configured by an independent circuit will be described.

Data to be transmitted through the TX terminal of the microcomputer 122 passes through the anti-noise capacitor C1 used to prevent the transistor Q1 from being turned on by the base resistor R1 for driving the transistor Q1 and various noises. do. Here, the transistor Q1 is an inverter 1262 used to invert the transmission data, and the inverted signal is scaled to make the inverted signal a size suitable for transmission as an FM signal by the resistors R2 and R3. At this time, the size is determined by (R3 / (R2 + R3)) * VCC. That is, when R2 is constant, increasing the value of R3 increases its size, and decreasing R3 decreases its size.

The FM transmission signal adjusted to a size suitable for transmission by the resistors R2 and R3 becomes a square wave AMI signal through an AMI signal converter 1226 composed of a coupling capacitor C3 and a resistor R4. The capacitor C4 connected in parallel to the rear end of the AMI signal converter 1226 is used for noise prevention. The FM transmission signal converted into the AMI signal is converted into the FM carrier frequency by the FM transmitter 1268 through the coupling capacitor C5. In this case, the FM transmission signal converted to the carrier frequency passes through the first impedance matching unit 1269 and passes through a band pass filter 1270 that passes only the FM transmission signal band, and only the FM transmission signal can be loaded on the coaxial cable 14. have. Wherein C8, C9, C10, C12 are coupling capacitors. On the other hand, the size of the FM transmission signal is adjusted by the resistor R10. The smaller the resistance R10, the smaller the FM transmission signal, and the larger the resistance R10, the larger the FM transmission signal.

When the FM transmission signal is loaded with data on the coaxial cable 14, the FM transmission signal is interrupted in order to transmit only desired data through the TX terminal of the microcomputer 122. This is because, in the case of the management room device 12 in which many terminals such as the guard room device 10 are connected, unwanted FM transmission signals are carried on the coaxial line 14, which may adversely affect the communication channel. Accordingly, the FM transmission signal is intercepted by the switching control unit 1272 composed of R12, C11, D1, D2, R11, and R13 and to which the switching control signal SW-CTRL is applied. That is, when data is transmitted through the TX terminal of the microcomputer 122, when the switching control signal is applied as a high signal, the diodes D1 and D2 of the switching control unit 1272 are simultaneously turned on by the control signal to form a path. Therefore, this control signal is applied to the base of the buffer transistor Q3. However, when the switch control signal is applied low, the diodes D1 and D2 are turned off so that no path is formed. Therefore, data is transmitted only when the switching control signal is high. Here, the diodes D1 and D2 used must be fast switching speeds. On the other hand, the role of C11 and R12 is a protection element which prevents the diodes D1 and D2 from turning on due to ambient noise even when no control signal is input to the switching control port of the microcomputer 122.

The FM transmission signal passing through the switching control unit 1272 is applied to the second impedance matching unit 1274, where the transistor Q3 is for a buffer. In addition, the FM transmission signal biased to 1/2 of the VCC by the resistors R14 and R15 is output through the emitter terminal of the transistor Q3. Here, the resistor R17 is an impedance matching resistor used to reduce the return loss when the FM transmission signal is carried on the coaxial line. In addition, only the FM transmission signal is loaded on the coaxial line BNC1 by a one-pole bandpass filter including L1 and C13.

R8, R7, C2, C7, and C24, which are not mentioned in the above-described FM modulator 12, are noise removing active elements for supplying pure power to the power supplied to each transistor.

The modulated FM transmission signal is loaded on the coaxial line BNC1, and the frequency block converter 128 converts the frequency into an uplink frequency band which is easy for transmission. The FM transmission signal converted into an uplink frequency band that is easy to transmit is loaded on the coaxial line BNC2 through the coupling capacitor C14 and applied to the guard room apparatus 10. From this point on, the signal changes to an FM reception signal. The signal passes through the bandpass filter 1242 through the coupling capacitor C15, passes through the coupling capacitor C16, and is then input to the FM receiver 1244. The initial transmission is performed by removing the RF signal from the signal in the uplink frequency band. Only the AMI signal is demodulated.

The demodulated AMI signal is filtered by a bandpass filter 1246 consisting of R18 and C17, and then passed through a coupling capacitor C18 to appropriately transform it into an input signal of the comparator 1250 (R19) (R20) ( An input of the non-inverting amplifier 1248 composed of R21 (R22) and capacitor C19 is provided. Here, the role of the resistors R18 and R19 is a bias adjustment resistor used to enable full swing when the input signal becomes the output signal, and the resistors R21 and R22 are non-inverting amplifiers ( 1248 is a resistor used to adjust the output gain, and capacitor C19 is for alternatingly coupling. The ANI signal, scaled to a size that is easy to recover the FM transmission signal, is input to the positive terminal of the comparator 1250. The resistors R25 and R26 are resistors used to provide a margin of hysteresis of the comparator 1250. And resistors R23 and R24 are resistors used for the reference voltage of the comparator 1250, and the capacitor C20 is a smoothing capacitor used to prevent the reference voltage from being shaken by the voltage variation. The AMI signal passing through the comparator 1250 is converted into a TTL signal, where the magnitude of the signal is determined by the resistor R27 and the capacitor C22 is a capacitor used for noise removal.

After the signal is inverted in the inverter 1252 constituted by the transistor Q5 and the resistors R27 and R28, the FM received signal adjusted to a predetermined size is converted into a complete TTL signal, so that the microcomputer 102 of the guard room device 10 is changed. It is input to the RX terminal, and this signal becomes a reception signal. Here, the role of the capacitor C23 is an active noise removing element for supplying pure power to the power supplied to the transistor Q5. On the other hand, the role of the transistor Q4 of the comparator reset part 1254 initializes the output of the comparator 1250 to prevent malfunction of the comparator. That is, when the TX terminal of the microcomputer 102 is activated and the RX terminal does not operate. When the COM-RESET port of the microcomputer 102 is made high, the output of the comparator is tied low, and the RX terminal of the microcomputer is always high. Accordingly, the COM-RESET signal is applied as a low signal only when the microcomputer 102 intends to receive data. Here, C21 and R30 are noise removing active elements used to prevent the transistor Q4 from being turned on by the noise.

As described above, according to the data communication apparatus using the FM modulation and demodulation method of the unmanned housing security system according to the present invention, even if the communication distance is far, accurate data transmission and reception is possible.

Claims (13)

In an unmanned security system for a multi-family house, in a two-way data communication device between a management room device and a guard room device each having a microcomputer that starts transmission by a predetermined switching control signal and receives data transmitted by a predetermined reset signal, An FM modulator for modulating and outputting a TTL signal output from a transmitting microcomputer into an AMI signal; and Corresponding to the FM modulator, data communication using the FM modulation / demodulation method for receiving the modulated AMI signal, demodulating the initial TTL signal, and outputting the demodulated AMI signal to the receiving side microcomputer to perform bidirectional data communication. Device. The data communication apparatus using the FM modulation / demodulation method according to claim 1, further comprising a frequency block converter for adjusting a transmission frequency band in the case of data communication from the management room device to the guard room device. The data communication apparatus using the FM modulation / demodulation method according to claim 1, wherein the data communication path from the management room device to the security room device uses a coaxial cable. 2. The apparatus of claim 1, wherein the FM modulator comprises: an inverter for inverting a signal output through the TX terminal of the transmitting microcomputer; A transmission signal magnitude adjusting unit for adjusting the inversion signal output from the inverter to a magnitude suitable for FM transmission; An AMI signal conversion unit converting the signal output from the transmission signal amplitude adjusting unit into an AMI signal suitable for transmission; An FM transmitter for inputting an AMI signal output from the AMI signal converter and converting the signal into an FM transmission frequency; And And a band pass filter for passing only a band of a transmission signal carried on the FM transmission frequency output from the FM transmitter and outputting the signal to the transmission path. 5. The apparatus of claim 4, wherein the FM modulator comprises: a switching controller for controlling the FM transmission signal such that only a desired transmission signal is output to the coaxial cable; And an impedance matching unit connected to a rear end of the switching control unit to reduce return loss of the FM transmission signal. According to claim 1, wherein the FM demodulation unit A bandpass filter for passing only a transmission band signal of the signal received through the coaxial cable; An FM receiver which inputs a signal passed through the band pass filter and demodulates only the AMI signal at the beginning of transmission; A low pass filter for filtering the AMI signal output from the FM receiver; A non-inverting amplifier for modifying the signal passing through the low pass filter; A comparator for comparing a signal output from the non-inverting amplifier with a predetermined reference signal and outputting a TTL signal; And And an inverter for inverting the signal output from the comparator and outputting the signal as a complete TTL signal. The apparatus of claim 6, wherein the FM demodulator further comprises a comparator reset unit for initializing the output of the comparator to prevent malfunction of the comparator. The apparatus of claim 5, wherein the switching control unit transmits data only when the switching control signal is high. The diode of claim 8, wherein the switching controller is connected to the diodes in a reverse direction from a predetermined node. And a resistor and a capacitor connected in series between the predetermined node and ground. 10. The apparatus of claim 9, wherein the diodes have a high switching speed. 10. The data communication device of claim 9, wherein the resistor and the capacitor are protection elements that prevent the diodes from turning on due to ambient noise even when the switching control signal is not input. The transistor of claim 7, wherein the comparator reset unit is connected to a predetermined node at a rear end of the comparator, a collector terminal connected to the node, a base terminal connected to a COM-RESET terminal side, and an emitter terminal connected to a ground side, and the transistor. And a resistor and a capacitor connected in parallel between the base terminal and the COM-RESET terminal of the FM modulation / demodulation method. The apparatus of claim 12, wherein the resistor and the capacitor are noise removing active elements used to prevent the transistor from turning on by noise.

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