TWI395161B - Communication method of an alarm system - Google Patents

Description

Alarm system communication method

The invention relates to a communication system communication method, in particular to a method for determining whether an address of a detection module is repeatedly allocated, and for quickly searching for an address of a detection module that detects an alarm signal.

With the advancement of technology, large and diverse public spaces are becoming more and more common, so it is important to monitor the security of every corner of a large space in real time.

The types of alarms monitored by the detection module usually include fire-related signals such as smoke, flame or gas, or signals related to security such as infrared, image or mechanical touch. If it is necessary to monitor the alarm signals separately or simultaneously, Complex power and transmission lines must be set up.

Conventional Alarm System As shown in the first figure, the alarm system 1 includes a host 60 and a plurality of alarms 70a, 70b, 70c, wherein each of the alarms 70a, 70b or 70c is in a one-to-one manner with the host 60. In connection, the host 60 can monitor various alarm signals. However, the one-to-one method requires not only more lines, but also higher cost and slower signal transmission.

The technical problem to be solved by the present invention is to provide a simple circuit for connecting the monitoring host end and the complex detecting sub-machine end to solve the complicated cost of the conventional complicated circuit. Therefore, the object of the present invention is to avoid using too many power lines and transmission lines in a simple connection manner.

In view of this, the present invention provides an alarm system in which a plurality of detection sub-machine ends are connected to each other in parallel, so that the detection sub-machines synchronously receive and emit signals to achieve fast signal transmission.

In order to solve the above technical problem, one technical solution of the present invention provides an alarm system including a control module and a plurality of detection modules. The plurality of detection modules are connected in parallel with each other and connected to the control module.

The control module sends a request signal to a plurality of detection modules. The plurality of detection modules synchronously receive the request signal and send a reply signal according to the request signal and detect the alarm signal. The control module determines whether there is a duplicate address according to the reply signal. When more than one of the plurality of detection modules detects the alarm signal, the control module can quickly find the address where the alarm signal is generated.

Another object of the present invention is to provide a communication method for an alarm system that determines whether an alarm system has a duplicate address in a simple communication format and quickly searches for an address at which an alarm signal occurs.

In order to achieve the above technical features, one technical solution of the present invention provides a communication method for an alarm system. When a user activates a control module of a host terminal, the control module sends a request signal to a plurality of detection modules, and multiple detection modes. The group synchronously receives the request signal and sends a reply signal to the control module according to the request signal. The control module determines whether the plurality of detection modules have duplicate allocation addresses. If there is no repeated allocation address, the plurality of detection modules are determined. Is there an alarm signal detected? When more than one of the multiple detection modules detects an alarm signal, the control module searches for the address at which the alarm signal is generated and controls the detection module that detects the alarm signal. Warning response.

In this way, by confirming whether the allocation of the address is wrong, the probability of erroneous reply can be reduced, and the least frequent search algorithm can be used to correctly and quickly search for the address where the alarm signal is generated, so as to synchronously monitor multiple detections. Module.

The above summary and the following detailed description are exemplary in order to further illustrate the scope of the claims. Other objects and advantages of the present invention will be described in the following description and drawings.

The invention adopts a simple line connection monitoring host end and a detecting sub-machine end as an alarm system, and uses a simple communication format as a communication protocol between the host and the slave machine, so as to achieve fast transmission and high accuracy.

The present invention will be described with reference to the accompanying drawings and drawings, in order to illustrate the embodiments of the invention The effect that can be achieved.

Please refer to the second figure, which is a schematic diagram of an embodiment of an alarm system provided by the present invention. As shown in the second figure, the alarm system 2 includes a control module 10 and a plurality of detection modules 20a, 20b, and 20c. The control module 10 has a reference level line p and a signal line q, and multiple detections. The modules 20a, 20b, and 20c are connected to each other in parallel, and are coupled to the control module 10 through the reference level line p and the signal line q. The plurality of detection modules 20a, 20b, and 20c are associated with the detection side alarm signals. The detection module provides a reference voltage or current reference level by reference to the reference line p. The control module 10 performs bidirectional signal transmission through the signal line q and the plurality of detection modules 20a, 20b, and 20c. In an embodiment, the control module 10 and the plurality of detection modules 20a, 20b, and 20c are wirelessly transmitted, and each has an independent power supply source.

When the control module 10 and the plurality of detection modules 20a, 20b, and 20c are wired for transmission, since the control module 10 transmits only one signal line q as the output and input transmission interface of the signal, the control module 10 issues The request signal is received by the plurality of detection modules 20a, 20b, and 20c. After the request signal is sent, the plurality of detection modules 20a, 20b, and 20c respectively send the reply signal to the control module according to the request signal. 10, instead of sequentially returning the reply signal, the control module 10 determines whether there is a duplicate allocation address according to the reply signal, and when more than one of the plurality of detection modules 20a, 20b, 20c detects the alarm signal, the search occurs. The address of the alarm signal.

Please refer to the third figure, which is a block diagram of an embodiment of a control module of an alarm system provided by the present invention. As shown in the third figure, the control module 10 includes a processing unit 11, a control unit 13, a signal transceiving unit 15 and a memory unit 19, wherein the processing unit 11 and the control unit 13, the signal transceiving unit 15 and the memory unit respectively The control unit 13 receives an operation command from the user, and the operation command includes searching for an address, adjusting sensitivity, security authentication, and alert response, etc., so that the control module 10 operates in different modes; the memory unit 19 stores the request. The data processing unit 11 converts the request data into the corresponding request signal after adding the request data to the header according to the operation instruction; the signal transceiver unit 15 modulates the request signal through the pulse wave and sends the request signal to the plurality of detection modules. 20a, 20b, 20c, the pulse wave modulation may be composed of pulse width modulation (PWM), pulse position modulation (PPM) or both; the signal transceiving unit 15 receives and detects a plurality of detection modules 20a, The reply signal of 20b, 20c; the processing unit 11 determines whether the plurality of detection modules 20a, 20b, 20c have duplicate allocation addresses according to the reply signal, and uses a search algorithm to search for the bit where the alarm signal is generated. . The request signal includes a header A and a data frame A. The data frame A describes the request data, and the reply signal includes a header B and a data frame B.

The request signal can be a polling signal, a search alarm address signal, a sensitivity adjustment signal, a security authentication signal, and an alarm response signal. The request signal and the reply signal are packet signals of a specific format, including a header and a data frame, respectively, and the control module 10 and the plurality of detection modules 20a, 20b, and 20c are mutually hand-held through the header. For example, the request signal of the control module 10 includes the header A, and the response signals of the plurality of detection modules 20a, 20b, and 20c include the header B, and the header A and the header B are mutually authenticated bytes. The control module 10 and the plurality of detection modules 20a, 20b, and 20c can communicate with each other. The plurality of detection modules 20a, 20b, and 20c send corresponding response signals according to different data frame A formats of the request signals, that is, different request signals, and the format of the data frame B of the reply signals is also different.

In an embodiment, the data frame A bit length of the request signal may be 16 bits, including a set of frame descriptors, a set of address fields, and a set of command bits (command) Field), etc., the bit allocation can be as shown in Table 1, the position order of the above-mentioned byte groups can be arbitrarily adjusted. As the control module 10 operates in different modes, the description bits are composed of different 0s or 1s, as shown in Table 2, which are polling signals and search alarm address signals, respectively. Sensitivity adjustment signal, security authentication signal, and description bit of the alarm response signal. The type of the request signal can be changed according to the bit length of the description bit, and the bit length of the bit is described. The longer, the more types of request signals can be.

The bit length of the address bit represented by the address bit determines that the control module 10 can control the number of the plurality of detection modules 20a, 20b, and 20c, for example, the bit length of the address bit is 8 The number of the plurality of detection modules 20a, 20b, and 20c may be up to 28; and the different command bits control the plurality of detection modules 20a, 20b, and 20c to issue corresponding response signals.

When the user needs to confirm the identity of the plurality of detection modules 20a, 20b, and 20c, the control module 10 sends a security confirmation signal, wherein the data frame A of the security confirmation signal may include a 12-bit correction code. After receiving the security confirmation signal, the plurality of detection modules 20a, 20b, and 20c send a reply signal including the same bit confirmation code, wherein the confirmation code can be set by the user or preset by the factory, and the control module 10 is preset. Determining whether the confirmation code conforms to a preset identification code. If yes, the control module 10 and the plurality of detection modules 20a, 20b, and 20c can communicate with each other through the header A of the security confirmation signal and the data having the authentication code. Box A and the data frame B of the reply signal and the data frame B with another authentication code are double-confirmed to ensure that they are not interfered with by other brands or electronic products of the same communication protocol. In an embodiment, the control module 10 can The safety confirmation signal is sent twice in succession or separately, so that the correction code changes more and the safety confirmation is more accurate.

In a state of general monitoring, the user may select to monitor one or more detection modules 20a, 20b, 20c, and the control module 10 continuously sends a polling signal to the plurality of detection modules 20a, 20b, 20c, in one In an embodiment, the reply signals of the plurality of detection modules 20a, 20b, and 20c include a set of detection type bits, an interrupt bit, a set of data description bits, a repeated address confirmation bit, and an information bit. The format of the element is as shown in Table 3. The longer the bit length of the detection type bit, the more detection types the plurality of detection modules 20a, 20b, and 20c can have. The type of detection can be smoke and temperature. One or a combination of the flame or light alarm signals, when the type of the detection module 20a is a composite type, that is, a single detection module 20a can sense various alarm signals, and the data description bit indicates the detection module. The detected data detected by 20a, the data bit corresponds to the data description bit, indicating that the data describes the data strength of the bit, such as the temperature level or the gas concentration. The detection type bit and the data description bit can be respectively shown in Table 4 and Table 5.

When one or more of the plurality of detection modules 20a, 20b, and 20c detect an alarm signal, and the bit value of the interrupt bit of the reply signal is 1, the control module 10 is based on the plurality of detection modules. The reply signals of 20a, 20b, and 20c stop issuing the polling signal, and issue an alarm address search signal to the plurality of detecting modules 20a, 20b, and 20c. The alarm address search signal includes a set of comparison address information bits and a group. The comparison command bit has a format as shown in Table 6. The comparison address information bit corresponds to the address information of the reply signal, and is used to compare with the address information of the reply signal; and the comparison command bit and detection Type-related, used to compare different types of detection, the user sets the priority of the alarm address search, such as flame detection and smoke detection first.

The plurality of detection modules 20a, 20b, and 20c simultaneously send a reply signal including a set of address information bits and a set of inverted address information bits, and the format thereof is as shown in Table 7. Only one of the groups 20a, 20b, and 20c detects the alarm signal. After confirming the address information by the control module 10, it is confirmed whether the inverted address information bit and the address information bit are mutually inverted, if the confirmation is correct. The control module 10 can identify the address of the alarm signal by using the address information of the reply signal; if more than one detection module detects the alarm signal, the control module 10 that receives the plurality of reply signals at the same time cannot recognize the address. When the address of the alarm signal occurs, or one of the detection modules cannot be confirmed by the address information, the control module 10 searches for the address where the alarm signal is generated by using the least number of search algorithms.

The least number of search algorithms can be a binary search method, which has the advantage of being fast and accurate compared to the sequential search method, and can process a large number of sorted data. In one embodiment, multiple detection modules 20a, 20b There are 250 of 20c, and at least 1 search is performed by sequential search method. The maximum search is 250 times, and the average search is performed. Second, and search for at least 1 by binary search. The search range is searched for by the first 26=256, then each range is reduced to half of the original, and the maximum search is performed. Average search Times, so the maximum number of searches is reduced from 250 to 8.

When the control module 10 searches for the address where the alarm signal is generated, the alarm signal includes one of a combination of smoke, temperature, flame or light alarm signals. In one embodiment, the single detection module 20a can have various sensing functions. The function, that is, the composite detection module, the control module 10 sends a warning reaction signal to control the warning response of the plurality of detection modules 20a, 20b, 20c, including a ringing sound, a flashing light or a marquee subtitle warning. One or a combination. After searching for the address where the alarm occurs, the user judges whether there is a false detection, that is, whether the multiple detection modules 20a, 20b, 20c are mis-responsive or the detection is too sensitive, and if multiple adjustments need to be adjusted In response to the detection of the modules 20a, 20b, 20c, the control module 10 sends a sensitivity adjustment signal to the plurality of detection modules 20a, 20b, 20c to adjust the sensitivity of the plurality of detection modules 20a, 20b, 20c, wherein the sensitivity The command bits for adjusting the signal can be as shown in Table 8.

Please refer to the fourth figure, which is a waveform diagram of an embodiment of a communication protocol of an alarm system provided by the present invention. As shown in the fourth figure, the voltage pulse wave and the current pulse wave waveform change with time. In an embodiment, the request signal sent by the control module 10 is a voltage pulse wave, and the voltage value thereof is about 18~. 24V, the pulse wave intensity is about 5~9V, and the basic time length of each pulse wave is about 500μs. The time length of the pulse wave is different depending on the request signal, and the signal transceiving unit 15 will request the signal pulse wave. After the position modulation, the request signal including the header A and the data frame A is continuously issued, wherein the data frame A has a bit size of about 16 bits, and then the signal transceiving unit receives the plurality of detection modules 20a, 20b, 20c. The reply signal sent by the synchronization, wherein the reply signal includes the current pulse of the header B and the data frame B, the current value is about 22 mA, and the intensity of the pulse wave is about 22 mA.

The response signal is converted into a received signal by the processing unit 11, and the signal transceiving unit 15 adjusts the received signal to the header B and the received data frame, wherein the received data frame is the clock signal 40 of the control module and the inverted phase of the data frame B. Synthesis, as shown in the fourth figure, when data frame B has a current pulse 41, the received data will also have an inverted voltage pulse 41' at the opposite clock signal bit.

When the user checks whether the plurality of detection modules 20a, 20b, 20c have a double address, the control module 10 continuously sends a polling signal, and the data frame A of the polling signal may include address information. The control module 10 polls each detection module with different address information, and the plurality of detection modules 20a, 20b, and 20c synchronously receive each different polling signal, when the address information of the polling signal is received. When one of the detection modules corresponds to one of the detection modules, one of the detection modules sends a reply signal, wherein the data frame B of the reply signal includes an address confirmation bit, and the address confirmation bit has a pulse wave. The address acknowledgment bit corresponding to the received data frame also has a pulse wave with an intensity of about 1.

If the intensity of the pulse wave value of the corresponding data frame in the corresponding data frame exceeds a preset intensity, as indicated by the pulse wave 43', it means that more than one detection module sends a reply signal, that is, the signal transceiver unit 15 receives the signal. A data frame B containing an address acknowledgment bit value whose intensity exceeds a predetermined intensity. In an embodiment, the address acknowledgment bit of the received data frame has a pulse strength of 2, indicating that there are two detection modes simultaneously. The group has the same address information, so that the processing unit 11 can determine that the plurality of detection modules 20a, 20b, and 20c have duplicate allocation addresses, and the control module 10 prompts the user to make settings by sound or subtitle, or It is controlled to control the plurality of detection modules 20a, 20b, 20c to emit sounds or subtitles to prompt the user to make settings.

Please refer to the fifth figure, which is a flowchart of an embodiment of a communication method of an alarm system according to the present invention. As shown in the fifth figure, firstly, for the sake of security, the control module 10 determines whether the plurality of detection modules 20a, 20b, 20c have passed the security verification, that is, the control unit 10 issues a security confirmation signal, and multiple detections. The module 20a, 20b, 20c sends a reply signal including the confirmation code according to the security confirmation signal, and the control module 10 determines whether the confirmation code is correct, and sends a reply through the header A of the security confirmation signal and the data frame A with the authentication code. The data frame B of the signal and the data frame B with another authentication code are double-confirmed to avoid interference from other brands or to prevent malicious invasion by others, to ensure the normal operation of the alarm system 2 (S501), and if not, control The module 10 cannot recognize the reply signal sent by the undetected detection module, and the alarm system 2 will not operate; if it is correct, the control module 10 and the plurality of detection modules 20a, 20b, 20c can communicate with each other. .

After the verification, the control unit 10 continues to send the request signal. At this time, the request signal is a polling signal, and the control unit 10 polls the plurality of detecting modules 20a, 20b, and 20c one by one, and the control module 10 is based on the reply signal. The strength of the repeated address bit determines whether the plurality of detection modules 20a, 20b, 20c have a double address (S503). When a duplicate allocation address occurs, the control module 10 controls the repetition. The address detection module sends a warning, such as a sound or a subtitle, to remind the user to reset the address information of the detection module, or the control module 10 sends an address signal to reset the plurality of detection modules 20a. The address information of the 20b, 20c (S505), after resetting, returns to determine whether the plurality of detection modules 20a, 20b, 20c have a double address (S503).

Until the plurality of detection modules 20a, 20b, and 20c are corrected, the control module 10 determines that the plurality of detection modules 20a, 20b, and 20c have no repeated address allocation, and the control module 10 continues to poll with different address information. The signals are polled one by one to the plurality of detection modules 20a, 20b, and 20c (S507). The plurality of detection modules 20a, 20b, and 20c send corresponding response signals according to different polling signals and simultaneously detect the alarm signals. (S509), the control module 10 determines whether the plurality of detection modules 20a, 20b, 20c have one or more detected alarm signals (S511). If no alarm signal is detected, the control module 10 continues. The polling signal (S507) is continuously sent. If the alarm signal is detected, the control module 10 interrupts the polling signal, and when a detecting module detects the alarm signal, the control module 10 detects the alarm signal. If the address information included in the reply signal of the detection module cannot be confirmed by the address of the control module 10, that is, the address information is incorrect, or when the plurality of detection modules 20a, 20b, 20c detects the alarm signal at the same time, the control module 10 sends an alarm address search signal, and utilizes the most The search algorithm 10 sends a warning response signal to the plurality of detection modules 20a, 20b, and 20c to control the detection mode of the alarm signal. The group issues a warning response, including a bell sound, a flashing light, or a marquee subtitle (S515).

After the multiple detection modules 20a, 20b, and 20c issue a warning response, the user determines whether there is a false detection, that is, whether the multiple detection modules 20a, 20b, and 20c are mis-responsive or the detection is too sensitive ( S517); if there is no false detection, the control module 10 continues to send a request signal to the plurality of detection modules 20a, 20b, 20c (S507), and if there is a false reaction, the user operates the control module 10 to make control The module 10 sends a sensitivity adjustment signal to the plurality of detection modules 20a, 20b, and 20c to adjust the detection sensitivity of the plurality of detection modules 20a, 20b, and 20c (S519).

In view of the above-described embodiments, it can be seen that the present invention achieves the purpose of quickly searching for an alert address by using a simple communication protocol. Thus, the alarm system and the communication method thereof of the present invention can solve the problem of cost increase caused by the conventional complicated circuit.

The drawings and the descriptions of the present invention are only examples of the present invention, and are not intended to limit the present invention. Anyone skilled in the art can make various changes and refinements according to the above description, if any other. The spirit of the present invention and the technical means for not substantially changing the present invention are within the scope of protection covered by the present invention.

Convention:

1. . . Alarm system

60. . . Host

70a. . . Alarm

70b. . . Alarm

70c. . . Alarm

this invention:

2. . . Alarm system

10. . . Control module

11. . . Processing unit

13. . . control unit

15. . . Signal transceiver unit

19. . . Memory unit

20a. . . Detection module

20b. . . Detection module

20c. . . Detection module

p. . . Reference level line

q. . . Signal line

41, 41', 43, 43'. . . Pulse wave

40. . . Clock signal

S501~S519. . . Step flow of the communication method of the alarm system

The first figure is a schematic diagram of one embodiment of a conventional alarm system;

The second figure is a schematic diagram of an embodiment of an alarm system of the present invention;

The third figure is a block diagram of an embodiment of a control module of the alarm system of the present invention;

Figure 4 is a waveform diagram of an embodiment of a communication protocol of the present invention; and

The fifth figure is a flow chart of an embodiment of a communication method of the alarm system of the present invention.

2. . . Alarm system

10. . . Control module

20a. . . Detection module

20b. . . Detection module

20c. . . Detection module

p. . . Reference level line

q. . . Signal line

Claims (33)

A communication system for an alarm system, the alarm system includes a control module and a plurality of detection modules, wherein the detection modules are connected in parallel with each other and connected to the control module, and the communication method steps of the alarm system include: determining Whether the detection modules pass the verification; determine whether the detection modules have duplicate allocation addresses; the control module sends a request signal to the detection modules; the detection modules synchronously receive the request And send a reply signal to the control module based on the request signal; determine whether the detection module detects an alarm signal; and when a plurality of the detection modules detect an alarm signal , the control module searches for the address where the alarm signal occurs. The communication method of the alarm system according to claim 1, wherein the control module searches for an address at which the alarm signal is generated to use a minimum number of search algorithms. The communication method of the alarm system as described in claim 1, wherein the request signal is a polling signal, an alarm address search signal, a sensitivity adjustment signal, a security authentication signal or a warning response signal. For example, the communication method of the alarm system described in claim 1 further includes the control module controlling the alert response of the detection modules. For example, in the communication method of the alarm system described in claim 1, if the detection modules have duplicate allocation addresses, the control module corrects the address data of the detection modules. The communication method of the alarm system as described in claim 3, wherein the determining whether the detection modules pass the verification is that the security authentication signal is sent by the control module, and then according to the detection modules. Reply to the signal to determine whether it meets a preset ID. The communication method of the alarm system according to claim 6, wherein the preset identification code is factory built or set by a user. In the communication method of the alarm system described in claim 6, when one of the detection modules does not meet the preset identification code, the control module cannot recognize the reply signal sent by the control module. In the communication method of the alarm system described in claim 3, if the detection module does not detect the alarm signal, the control module continuously sends the request signal to the detection modules. In the communication method of the alarm system described in claim 9, if the detection module detects the alarm signal, the control module stops issuing the request signal and sends the alarm address search signal to The detection modules. For example, the communication method of the alarm system described in claim 3 includes determining whether the detection modules are erroneously detected. For the communication method of the alarm system described in claim 11, if the detection modules are detected by mistake, the sensitivity adjustment signal is sent by the control module to adjust the sensitivity of the detection modules. For the communication method of the alarm system described in claim 12, if the detection modules are detected correctly, the control module continuously sends the polling signal. The communication method of the alarm system as described in claim 1, further comprising: when one of the detection modules detects the alarm signal, the control module provides address information for the detection module confirm. For example, in the communication method of the alarm system described in claim 14, wherein the address information is confirmed as based on a reverse address information. The communication method of the alarm system of claim 1, wherein the request signal comprises a description bit, an address bit, and a command bit. A communication system for an alarm system, the alarm system includes a control module and a plurality of detection modules, wherein the detection modules are connected in parallel with each other and connected to the control module, and the communication method steps of the alarm system include: The control module sends a security authentication signal to the detection modules; the detection modules send a reply signal according to the security authentication signal; and the control module determines whether the detection modules pass according to the reply signal verification. The communication method of the alarm system according to claim 17, wherein the security authentication signal includes a first identification code. The communication method of the alarm system of claim 18, wherein the reply signal comprises a second identification code, the second identification code corresponding to the first identification code. A communication system for an alarm system, the alarm system includes a control module and a plurality of detection modules, wherein the detection modules are connected in parallel with each other and connected to the control module, and the communication method steps of the alarm system include: The control module sends a polling signal to the detection modules. The detection modules send a reply signal based on the polling signal. The control module determines whether the detection modules are duplicated based on the reply signal. Assign an address. The communication method of the alarm system of claim 20, wherein the polling signal comprises a description bit, an address bit, and a command bit. For example, in the communication method of the alarm system described in claim 20, when the detection modules have duplicate allocation addresses, the address data of the detection modules are corrected. The communication method of the alarm system of claim 20, wherein the control module determines, according to the reply signal, whether the detection modules have a duplicate allocation address based on a repeated address bit in the reply signal The signal strength of the yuan is judged. For example, in the communication method of the alarm system described in claim 23, when the signal strength of the repeated address bit exceeds a predetermined intensity, it is determined that the detection modules have duplicate allocation addresses. A communication system for an alarm system, the alarm system includes a control module and a plurality of detection modules, wherein the detection modules are connected in parallel with each other and connected to the control module, and the communication method steps of the alarm system include: The detection module detects an alarm signal; the control module sends an alarm address search signal to the detection modules by using a search algorithm; the detection modules send a reply signal to the control module And the control module determines the address of the alarm signal according to the reply signal. The communication method of the alarm system of claim 25, wherein the alarm address search signal comprises a description bit, an address bit, and a command bit. The communication method of the alarm system according to claim 26, wherein the reply signal comprises an address information bit and a reverse address information bit. The communication method of the alarm system according to claim 25, wherein the search algorithm is a minimum number of search algorithms. The communication method of the alarm system according to claim 25, wherein the search algorithm is a binary search method. The communication method of the alarm system as described in claim 25, further comprising the control module controlling the reaction of the detection modules that detect the alarm signal. A communication system for an alarm system, the alarm system includes a control module and a plurality of detection modules, wherein the detection modules are connected in parallel with each other and connected to the control module, and the communication method steps of the alarm system include: The control module issues a request signal; the detection module simultaneously sends a reply signal to the control module; and the control module determines an address at which the alarm occurs based on the reply signal; wherein the request signal includes a first table And the first data frame, the reply data signal includes a second header and a second data frame, the first data frame including a description bit, an address bit, and a command bit, the second data The frame includes a detection type bit, an interrupt bit, and a repeated address confirmation bit. The communication method of the alarm system according to claim 31, wherein the second data frame further comprises a data description bit. The communication method of the alarm system of claim 32, wherein the second data frame further comprises an information bit, the information bit corresponding to the data description bit.