How Do Large Security Projects Combine Security System Integration

Before the integration of the security engineering system, the project owners of each stage must first understand the stage work and content of the entire project in order to clearly understand the details of the system integration in the project. First of all, in terms of general public works, after the equipment enters the market, equipment inspection will be carried out first, and then the equipment will be further assembled and tested in the place where it is placed and tested on the site, and the equipment will be assembled and fixed at the installation site. After completing all line connections and power supply, it is possible to enter the system integration test and overall system integration test phase. However, the general engineering is completed after the installation of the equipment, and after the operation test, it directly enters the acceptance stage. Therefore, the engineering personnel must master the two different integration phases of the engineering system and do the next system integration project work. And how must these integrated execution steps work?

When implementing security system integration project, we must first consider the possibility of software integration, and then determine the hardware interface. When integrating software, you can start with the most basic communication protocols, or use an integrated software platform written by software vendors based on open APIs. At present, due to the compatibility or consistency of the integration methods released by most software platforms, they are all oriented towards the test results of partners in ONVIF or PSIA or other third and fourth standard protocol organizations. Therefore, this article only provides soft software. System integration steps for hardware on communication protocols.

Software communication protocol integration

In order to implement consolidation and integration of communications, it is necessary to first consider the consistency of the software work platform (OS), such as the compatible use of Windows and Linux, and to consider the data transmission format when integrating subsystems. Because the system and the system must communicate with each other through the same language, such a method is to use the standards set by the communication protocol as the same language to carry out command formats for data transmission commands and responses.

After completing the software protocol integration, it is much easier to integrate hardware devices between systems. Many security hardware devices in the market are uniquely designed or have unique specifications. However, system integration is basically implemented in a common standard architecture. Therefore, the uniqueness of some products may be overlooked in system integration.

Based on this integration model, security control systems such as surveillance, access control, security, alarm, fire radio, intercom, and remote data collection can be integrated and operated on the same work platform. These system integration tasks all have certain rules and regulations. Whether they are linked or triggered, or logical sequence scheduling, they can be achieved through certain system integration steps.

Non-negligible details

When performing engineering system integration steps, the details of collocation between each subsystem must be considered. For example, between the surveillance system and the access control system, in the past, video was not selected as a switch gate, and video switching was used to determine the opening and closing of the door. In fact, effective access control and monitoring and integration should not only be linked to each other, but should be more actively consider the damage caused by a mistake in the access control, how to use the monitoring system to help complement tracking, but also let the monitor not only stop at the presentation of video , And should be able to actively control all relevant access control area video, real-time control of errors and incidents.

In addition, the integration between firefighting and alarm broadcasting should not only generate alarm sounds and trigger prerecorded broadcasts, but should also be in the fire zone alarms where alarms occur, play evacuation escape guide broadcasts, start guide indicators or billboards, or even incorporate video. The monitoring system provides life-saving personnel with disaster relief status. In this system integration process, there are some small details that are easily overlooked.

　 Compatibility in power conversion: for example, neglecting the use of AC/DC dual-use equipment; interchangeability in letter format: eg ignoring the interchangeability of RS-485 and RS-422; isomorphism in positioning: eg communication protocol Frequently, due to the neglect of check-bit coordination, there are indeed transmission signals between the integrated systems, but they are not controlled; compatibility in transmission conversion: for example, ignoring the interchangeability of multi-mode, single-mode optical signal transmission, resulting in Unnecessary wire replacement In order to avoid the above details being ignored during execution, the engineering personnel should develop a set of system function checklists and confirm the function integration items to be performed one by one.

Eight "miscellaneous diseases" and solutions

System integration is the key to the success of the project. The negligence of any small details may become a big problem. Therefore, before implementation, it is necessary to think in advance of all possible problems and to anticipate solutions in advance so that they can deal with them at any time. The following are eight common system integration issues and propose solutions.

1, the voltage drop or current is insufficient

When the system is operating alone, it can provide enough power, but after the system is integrated, voltage drop and current shortage occur, causing the system to assume an unstable state. solution:

Calculate the power demand and form categories for all system integrations; separate the same DC and AC power, and re-arrange the power bus junctions, fuse switch capacity, and power control loops to integrate the UPS power interruption supply system load and change production Switching power supply DC power in a small area to stabilize the voltage; the system is fully turned on and operated, and the maximum current value of each power supply switch is measured one by one within the range of the safety load to ensure that the power integration is correct.

2. Some functions cannot be executed after integration

When the system was executed alone, it was all normal, but after integration with the main system platform, it was found that some functions could not be performed or affected by other subsystems and could not operate normally. solution:

Start, operate each subsystem, carry out all project functions, carry on systematic online test one by one, confirm each system after the connection can be normal operation, and find the implementation problem from the database or background procedure;

If problems arise due to the incorporation of other systems into the system, the subsystems should be offline one by one to clarify the sources of the subsystems that affect the operation of the system, and then the problems in the system data should be compared one by one to grasp the problems and handle or modify them smoothly. Agreement.

3, the job is not synchronized after linkage

The operating modes of various subsystems are different, and the operating modes after linkage are not synchronized, so that the owners do not know what basis they are based on. solution:

Compare the same instruction background program of each subsystem, DOS window send status bar instruction and string, whether it is not responding? Is it garbled? Is it consistent with the corresponding?

One by one to find problem instructions, modify the protocol and command string action time parameters, you can correct the synchronization problem.

4, frequent crashes and garbled problems

Subsystem software often crashes, automatically sends garbled commands, or receives commands but does not respond. solution:

• Check whether the connection status of the online connector is correct between systems? Check whether the database field in the master integrated system is correct?

· Check the sub-system encoding command and data sending time parameter setting, whether it is automatic or manual error setting.

5, the system database Run Time Error

In different systems, the respective software database has no overflow auto-clear function and generates a Run Time Error. solution:

· Clear the backup database regularly; set the database automatic override function and automatic backup; set the event data to be stored only, and the other system online data automatic timing clearing function can improve the database overflow situation.

6, the command to send or crash

Different instruction receiving and responding modes cause the system to freeze when the command is sent continuously. Solution: Check whether the character string of the communication protocol between the systems, check bit parity setting, check stop bit field setting are consistent; check whether the time of each subsystem workstation is synchronized and correct.

7, switch mode is different

System switch mode is not the same, adding to the operation trouble. solution:

Through network program links, with the same operation screen and single control commands, the integration of various subsystem programs or hardware power is turned on or off; the use of power monitoring, monitoring and management of the power system, to solve the power can not be unified control problems.

8, the time is not synchronized

The system time is not synchronized, and the Chinese-British format is mixed, causing incorrect instructions to be issued or due to time errors causing the system to crash. Solution: Unify the date and time of all PCs or workstations, Chinese and English display formats, to avoid the situation in which commands are disorderly due to the differences in time and other parameter formats after the system is integrated; The time correction command is automatically sent at a certain time to synchronize the system time.