JP2001014574A - Management system and security system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recognize an area where the first specified information transmitted to a host device after power supply is turned on is written by making a 2nd means read identification data and to set a prescribed specified information storage area as an area where specified information to be next received is written according to the existence/absence of the finding of a specified information storage area where the value of an identification bit changes. SOLUTION: When an identification bit read this time coincides with the previously read identification bit (S 16), whether or not the current retrieval address ADR is an address in an alarm information storage area where the hundredth address information is written is decided (817). In the case of YES, an address INI where data including identification bit is written among areas to which the 1st alarm information is written is set as an address where an input is next performed (S 19). In a step 16, in the case of noncoincidence, the current retrieval address ADR is set as an address where alarm information to be next inputted is written (S18).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a management system and a security system.

[0002]

2. Description of the Related Art A plurality of security devices are RS-4.
There is a security system connected by a communication control line (bus) based on a standard such as E.85 (EIA-485 standard). The security device includes, for example, a surveillance camera, a VTR that records video captured by the surveillance camera, a frame switcher, and the like. Each security device is assigned an individual address so that it can be distinguished from other security devices on the bus. The setting of the address is performed by, for example, a dip switch provided in each security device.

[0003] A controller for remotely controlling each security device and centrally managing the state of each security device is connected to a bus to which each security device is connected. From the controller, the address of the security device to be remotely controlled, for example, VTR address "1", "PLAY", "tape removal"
(EJECT) By transmitting a command including control contents such as "" to the bus, the VTR having the address "1" is remotely controlled.

[0004] Some security devices connected to the bus have a function of detecting that an important event may have occurred in security. Such a security device has a problem in security. If it is detected that an important event may have occurred, alarm information is transmitted to the controller via the bus.

[0005] When the alarm information is sent from the security device, the controller stores the sent alarm information in a nonvolatile memory such as an EEPROM. The alarm information includes, for example, the type of the alarm and the time (month, day, hour, minute) at which the alarm information was generated.

[0006] The nonvolatile memory includes, for example, the latest one.
00 alarm information is stored. That is, 100
If new alarm information is sent after the alarm information for the number of cases has been accumulated, the new alarm information is overwritten in order from the old alarm information.

When the power of the controller is turned on, the address at which the last alarm information is written is stored in the RAM in the controller. Can be recognized by the controller.

However, if the power of the controller is turned on after the power of the controller is turned off, the controller can recognize the address to which the alarm information first sent to the controller after the power is turned on should be written. There is a problem of disappearing.

Therefore, information relating to the write address of the alarm information, for example, the address where the next alarm information to be sent to the controller or the address where the last alarm information is written is written in a predetermined area of the nonvolatile memory. It is conceivable to keep it. However, in this case, the number of times of writing information to the area of the nonvolatile memory where the information related to the write address of the alarm information is written becomes much larger than the number of times of writing to the other area of the nonvolatile memory.

When the number of times of writing in the area for writing alarm information has a considerable margin with respect to the guaranteed number of times of writing in the nonvolatile memory, the number of times of writing in the area for writing information related to the write address becomes the number of times of guaranteed writing in the nonvolatile memory. And the life of the non-volatile memory is shortened.

[0011]

According to the present invention, the power supply of the host device is turned on after the power supply of the host device is turned off without storing the information of the area where the specific information is to be written in the nonvolatile memory. In this case, an object of the present invention is to provide a management system that allows the host device to recognize an area in which the specific information first sent to the host device after power-on is to be written.

According to the present invention, without storing information of an area in which alarm information is to be written in a nonvolatile memory,
Provided is a security system in which, when a controller is turned on after a controller is turned off, the controller can recognize an area in which alarm information first sent to the controller after the power is turned on should be written. The purpose is to:

[0013]

A management system according to the present invention includes one or a plurality of terminal devices and a host device for managing the terminal devices, and the terminal device includes means for transmitting predetermined specific information to the host device. And the host device is
A non-volatile memory having a plurality of specific information storage areas for storing a predetermined number of specific information, and means for sequentially and cyclically writing predetermined specific information sent from the terminal device to the non-volatile memory; In the management system including: the host device, the first means for writing the specific information sent from the terminal device to the nonvolatile memory together with the identification bit, and when the power is turned on after the power is turned off, Second means for retrieving a specific information storage area in which the transmitted specific information is to be written, the first means comprising:
From the specific information storage area to which the received specific information is to be written, read the identification bit, invert the identification bit, and add the inverted identification bit to the specific information,
The specific information is written in the specific information storage area from which the identification bit has been read. The second means reads the identification data sequentially from the first specific information storage area in the nonvolatile memory, and sets the value of the identification bit. Means for retrieving a specific information storage area in which the value of the identification bit changes. If a specific information storage area in which the value of the identification bit changes can be found, the found specific information storage area is replaced with an area in which the specific information to be received next is to be written. Means for setting the specific information storage area in which the value of the identification bit changes, and setting the first specific information storage area as the area to which the next specific information is to be written It is characterized by having.

[0014] The security system according to the present invention comprises:
A security device and a controller for controlling the security device, wherein the security device includes means for transmitting alarm information to the controller when there is a possibility that an important event in security may have occurred; A nonvolatile memory having a plurality of alarm information storage areas for storing several minutes of alarm information; and a means for sequentially and cyclically writing the alarm information transmitted from the security device to the nonvolatile memory. In some security systems,
The first means for writing the alarm information sent from the security device to the nonvolatile memory together with the identification bit in the nonvolatile memory, and the alarm information to be written next when the power is turned on after the power is turned off. Second means for searching the information storage area, wherein the first means reads an identification bit from the alarm information storage area in which the received alarm information is to be written,
After inverting the identification bit, adding the inverted identification bit to the alarm information, and writing the alarm information in the alarm information storage area from which the identification bit has been read, the second means is provided in the nonvolatile memory. Means for reading the identification data in order from the first alarm information storage area and searching for the alarm information storage area in which the value of the identification bit changes, and detecting the alarm information storage area in which the value of the identification bit changes. Means for setting the found alarm information storage area as an area to which the next received alarm information should be written, and the first alarm information storage area in which the value of the identification bit changes cannot be found. Means for setting the alarm information storage area as an area to which the next received alarm information should be written Characterized in that it comprises.

As a security device, for example, a surveillance camera is used. The surveillance camera determines, for example, based on the input image whether or not a security-important event may have occurred, and determines that the security-important event may have occurred. Has means for sending alarm information to the controller.

As the security device, for example, a video recording device for recording a video taken by a surveillance camera is used. The video recording device includes, for example, a unit that sends alarm information to a controller when an object detection signal is input from an external object detection sensor.

[0017]

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

FIG. 1 shows the configuration of the security system. This security system includes one controller 11, three surveillance cameras 21, 22, and 23,
It is provided with three VTRs 31, 32, and 33 for recording images captured by the monitoring cameras 21, 22, and 23. Each of these devices is connected to a daisy chain (dasy chai) by a communication control line (bus) 1 of RS-485.
n) Connected in a manner.

Each of the security devices, that is, the monitoring cameras 21, 22, and 23 and the VTRs 31, 32, and 33 have a function of detecting that an important event may have occurred on the security. When it is detected that an important event may have occurred, alarm information is transmitted to the controller 11 via the bus 1.

Each of the monitoring cameras 21, 22, and 23 generates alarm information when, for example, a motion vector of an input image becomes a predetermined value or more. In addition, each VTR 31, 3
2, 33 generate alarm information when, for example, an object detection signal is input from an externally provided object detection sensor.

When alarm information is sent from each security device, the controller 11 sequentially and cyclically writes the sent alarm information in a nonvolatile memory such as an EEPROM. The alarm information includes the type of alarm and the time (month, day, hour, minute) when the alarm information was generated.
Consists of As the type of alarm, for example, the address of the security device that has generated the alarm information is used.

It is assumed that the latest 100 pieces of alarm information can be stored in the nonvolatile memory. That is, it is assumed that the nonvolatile memory has 100 alarm information storage areas.

FIG. 2 shows the contents of the alarm information written in each alarm information storage area in the nonvolatile memory.

Each alarm information storage area E is composed of five small areas e1 to e5 each having a capacity of 1 byte. Month data is stored in the first small area e1,
Day data is written in the small area e2, hour data is written in the third small area e3, minute data is written in the fourth small area e4, and data indicating the type of alarm is written in the fifth small area e5.

These five types of data are represented in BCD (Binary Decimal Number) notation. You. Month data is 1
This is data representing months to December. For example, October is 1
When expressed in BCD notation of bytes, it becomes "00010000". In addition, November becomes “00010001” and December
The month is "00010010". Therefore, the most significant bit of the month data is always "0".

Therefore, in this embodiment, the most significant bit of the month data is used as an identification bit for identifying an address to which the alarm information received first after the power supply of the controller 11 is to be written is to be written. The identification bit takes a value of “0” or “1”. The initial state of each small area in each alarm information storage area is all "
00000000 ".

Each time the alarm information is sent, the controller 11 stores the alarm information in the alarm information storage area next to the alarm information storage area in which the previous alarm information is written.
Write alarm information. Each time the alarm information is written in the alarm information storage area, the head address of the alarm information storage area is set to the RA which is a volatile memory.
M is written.

Therefore, when the power of the controller 11 is turned on, the head address of the alarm information storage area in which the received alarm information is to be written is the RAM.
Is determined based on the head address of the alarm information storage area in which the previous alarm information stored in the area is written. Every time 100 pieces of alarm information are written,
New alarm information is overwritten in order from the old alarm information.

When new alarm information is sent to the controller 11, the controller 11 reads an identification bit from the alarm information storage area in the nonvolatile memory where the currently sent alarm information is to be written, and reads the identification bit. After adding the inverted bit to the month data in the new alarm information as an identification bit, the new alarm information is written to the alarm information storage area where the new alarm information is to be written.

For example, as shown in FIG. 3, it is assumed that the month data in the previously transmitted address information has been written to address X. In this state, when new alarm information is sent, the identification bit “0” written at the address (X + N) (where N = 5) is read. Then, the value obtained by inverting the identification bit “
After "1" is added to the month data in the new alarm information as an identification bit, the new alarm information is written to addresses (X + N) to (X + 2N-1). As a result, as shown in FIG. , The month data in the new alarm information is written to the address (X + N).

When the power is turned on after the power of the controller is turned off, the identification bits added to the month data are sequentially read from the first alarm information storage area of the nonvolatile memory, and the identification data is read. Each time a bit is read, the value of the currently read identification bit is compared with the value of the previously read identification bit. If the value of the currently read identification bit is different from the value of the previously read identification bit, the address in which the currently read identification bit is stored is replaced with the alarm information to which the next transmitted address information is to be written. It is determined that this is the start address of the storage area.

If the contents of the non-volatile memory are as shown in FIG. 4 when the power is turned on after the power of the controller is turned off, the address (X +
2N) is determined to be the head address of the alarm information storage area in which the next transmitted address information is to be written.

Even if the identification bits are read from all the first to 100th alarm information storage areas, if there is no identification bit having a value different from the previously read identification bit, that is, if all the alarm information storage areas are present, If the values of the identification bits read from the area are the same, the first address of the first alarm information storage area is the first address of the alarm information storage area where the next transmitted address information is to be written. Is determined.

FIG. 5 shows a case where alarm information is received.
4 shows an alarm information writing processing procedure executed by the controller 11.

When receiving the alarm information, the controller 11 reads the month data including the identification bits stored in the area where the currently received alarm information is to be written in the nonvolatile memory (step 1).

After inverting the read identification bit (step 2), the inverted identification bit is added to the most significant bit of the month data in the alarm information received this time (step 3).

Then, the alarm information to which the identification bit has been added is written to an area in the nonvolatile memory where the currently received alarm information is to be written (step 4).

FIG. 6 shows an alarm information write address search procedure executed by the controller 11 when the power of the controller 11 is turned on.

It is assumed that the nonvolatile memory has 100 alarm information storage areas for storing 100 pieces of alarm information.

When the power supply of the controller 11 is turned on, the address INI to which the data including the identification bit is to be written is stored in the alarm information storage area in the nonvolatile memory where the first alarm information is to be written.
It is set as a search address ADR (step 11).

In this example, as shown in FIG. 3, the most significant bit of the month data is used as an identification bit, and the month data is written in a small area specified by the head address of each alarm information storage area. The case will be described. In this case, in step 11, the head address INI of the alarm information storage area in which the first alarm information is to be written is set as the search address ADR.

The data including the identification bit in the first alarm information is read (step 12), and the read identification bit is temporarily stored in, for example, a buffer (step 13).

Next, the search address ADR is updated to an address where data including an identification bit in the alarm information storage area where the next alarm information is to be written is written (step 14). Assuming that one piece of alarm information is composed of N types of data of 1 byte each, the search address ADR is the search address A up to that time.
It is updated to a value obtained by adding N to DR.

Data including an identification bit is read from the updated search address ADR (step 15). Then, it is determined whether the identification bit read this time matches the identification bit read last time (the identification bit stored in step 13) (step 16).

If they match (YES in step 16), it is determined whether the current search address ADR is an address in the alarm information storage area where the 100th address information is to be written (step 17). If the search address ADR is not an address in the alarm information storage area where the 100th address information is to be written, the process returns to step S13. Thus, the search address ADR
Are updated one by one, and the identification bits read from the previous search address ADR are compared with the identification bits read from the current search address ADR.

If it is determined in step 16 that the currently read identification bit does not match the previously read identification bit, the current search address ADR
Is set as the address to which the next input alarm information is to be written (step 18), and the alarm information writing address search processing is terminated.

If it is determined in step 17 that the current search address ADR is an address in the alarm information storage area in which the 100th address information is to be written, the address of the area where the first alarm information is to be written is set. Then, the address INI to which the data including the identification bit is to be written is set as the address to which the next input alarm information is to be written (step 19), and the alarm information writing address search processing is terminated.

[0048]

According to the present invention, when the power of the host device is turned on after the power of the host device is turned off without storing the information of the area where the specific information is to be written in the nonvolatile memory, Thus, the host device can recognize the area in which the specific information first sent to the host device after the power is turned on should be written.

According to the present invention, when the power of the controller is turned on after the power of the controller is turned off without storing the information of the area in which the alarm information is to be written in the nonvolatile memory, The controller can recognize the area in which the alarm information first sent to the controller should be written.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a security system.

FIG. 2 is a schematic diagram showing contents of alarm information.

FIG. 3 is a schematic diagram showing an example in which alarm information is written with an identification bit added.

FIG. 4 is a schematic diagram showing a method for writing new alarm information in the state of FIG. 3;

FIG. 5 is a flowchart illustrating an alarm information writing process performed by a controller when alarm information is received;

FIG. 6 is a flowchart illustrating an alarm information write address search processing procedure executed by the controller 11 when the power of the controller 11 is turned on.

[Explanation of symbols]

 1 Communication Control Line 11 Controller 21, 22, 23 Surveillance Camera 31, 32, 33 VTR

Claims (4)

[Claims] 1. A terminal device comprising: one or a plurality of terminal devices; and a host device for managing the terminal devices. Each terminal device includes means for transmitting predetermined specific information to the host device. A nonvolatile memory having a plurality of specific information storage areas for storing minute specific information, and means for sequentially and cyclically writing predetermined specific information sent from the terminal device to the nonvolatile memory. In the management system described above, the host device performs a first operation for writing the specific information sent from the terminal device together with the identification bit into the nonvolatile memory.
Means, and when the power is turned on after the power is turned off, a second means for searching for a specific information storage area to which the next specific information is to be written is provided. Is read from the specific information storage area to be written, the identification bit is inverted, the inverted identification bit is added to the specific information, and the specific information is written to the specific information storage area from which the identification bit is read. The second means reads identification data in order from the first specific information storage area in the nonvolatile memory and searches for the specific information storage area in which the value of the identification bit changes. If a specific information storage area whose value changes can be found, the found specific information storage area is set as an area to which the next received specific information should be written. Means for setting the specific information storage area in which the value of the identification bit changes, and setting the first specific information storage area as an area to which the next specific information is to be written. Management system characterized by the fact that: 2. A security device, comprising: a security device; and a controller for controlling the security device.
A means is provided for transmitting alarm information to the controller when there is a possibility that an important event has occurred in security.The controller has a plurality of alarm information storage areas for storing a predetermined number of alarm information. In a security system comprising: a nonvolatile memory provided; and means for sequentially and cyclically writing alarm information transmitted from the security device to the nonvolatile memory. Means for writing in the nonvolatile memory together with the identification bit, and second means for searching for an alarm information storage area in which the next received alarm information is to be written when the power is turned on after the power is turned off. The first means is an alarm for writing the received alarm information. Reading the identification bit from the system information storage area, inverting the identification bit, adding the inverted identification bit to the alarm information, and writing the alarm information in the alarm information storage area from which the identification bit was read. The second means reads identification data in order from the first alarm information storage area in the nonvolatile memory and searches for an alarm information storage area in which the value of the identification bit changes. Means for setting the detected alarm information storage area as an area where the next received alarm information should be written, and an alarm information storage area in which the value of the identification bit changes. If not found, the first alarm information storage area is replaced with the next received alarm information. Security system characterized in that it comprises means for setting the area to be written beam information. 3. The security device is a surveillance camera,
The surveillance camera determines, based on the input image, whether or not a security-important event may have occurred.If the monitoring camera determines that a security-important event may have occurred, 3. The security system according to claim 2, further comprising means for sending alarm information to a controller. 4. A security device is a video recording device for recording a video imaged by a surveillance camera,
3. The security system according to claim 2, wherein the video recording device includes a unit that sends alarm information to a controller when an object detection signal is input from an external object detection sensor.