What’s access control problems and solutions-part 1?
The access control system has always been an important part of the security system. There are a lot of access control problems every day, most of the access control problems are related to the details and frequently appear in the actual project. One may encounter this problem no matter it is a novice or an expert in access control system. Today, let’s know more about the access control solutions to those frequently appeared problems in the actual projects of the access control system.
1), In the access control system, how to effectively prevent anti-trail?
Answer: Anti-trailing has always been the most difficult access control problems to solve in the access control system. It’s also the most frequently appeared problems in the actual project and must be solved in all the access control system projects as it’s one of the primary functions of the access control system. There are several suggested ways to solve this access control problem:
- Change the door: install the speeding door (or three roller gates). This way also has its shortcomings. For example, speed-pass door basically used in indoors with a width of 55cm. It only allows one person to pass, also it’s with counting alarm function. If two people pass through the door at the same time, then an alarm occurs. The three roller brakes can be used in outdoors, but for those who cross over from above, the prevention effect is not ideal. The three roller brakes are suitable for places such as the exhibition meeting with security guards.
- Install an access control card reader. If a person follows the cardholder to enter and want to come out, he must also punch the card to open the door, so as to achieve the purpose of anti-tail. However, if the person follows the cardholder to enter and go out at the same time, an access card reader also can not achieve the purpose of anti-tail.
- Two-way reading card plus double door interlocking. Double door interlocking can basically solve the problem of trailing. As to open the second door, the first door must be locked, otherwise, you are not able to open the second door. A more troublesome way is to install the cameras. It uses image processing technology to detect portraits after the camera has captured images. However, this way is quite troublesome as it requires a lot of knowledge.
- If you are with a high-security level, you can use full-height doors or more advanced interlocking door (two doors, the person enters a post weigh, then the second door open). This way can realize anti-tail, but these doors are quite expensive.
2). Is the host an extension of different brands compatible with each other?
Answer: This problem is frequently mentioned in our VIP group of the low voltage industry network. A lot of people ask if it’s compatible when changing brands in halfway. Actually, it’s not compatible. For the host, as the wiring way and agreement is different, it’s quite impossible to compatible unless you have the bottom agreement of the two manufacturers.
Different manufacturers have different intercom products. The market doesn’t have a uniform standard, so it’s not compatible for different brands. Therefore, we must use a same brand host and extension in the actual project and must pay attention to it when we purchasing equipment. Many novices will have this problem and cause failure to the following projects.
3). When the management machine talks to the door machine, the microphone of the door machine screams, how to deal with this access control problem?
Answer: It is likely that the wires are not connected properly. The normal condition is that there each piece of power supply line and G line, and the G line is connected one piece more. Another possibility is that the sound is not adjusted appropriately.
4). How to troubleshoot if one can’t open the door by intercom extension?
Answer: This is an access control problems frequently mentioned by many users, but they are not able to describe it in detail which categorizes into failure to describe in details. We suggest that the users must try to describe the problems as detailed as he can so that we can give the corresponding answers. If the problem is not specifically described, the possible faults may be: the electric control lock is broken, the signal is unstable or the wires of the electric control lock is not connected well. Also, you can check whether there are problems with the circuits.
Another fault may be the extension is broken. If you can open the door by other extensions of the same system, it means that their access control problems with the host line or the electric control lock is broken. It can also be not able to open the extension if the transient voltage provided by the unit door machine which offers to the electric control lock is not strong enough. You can also check the unlock button of the extension to see whether it’s broken or not. The last possibility is that there’s something wrong with the codes.
5). An old deaf man in an old reconstructed community who wants to install a bell with a lamp from the extension to remind himself to open the door when someone ringing the bell downstairs. Does it work and how to connect the wires?
Answer: The signal of ringing can be used to transform the circuit and lead the trigger signal to the circuit of the electric bell and the lamp through the relay switch. Turn the contacts switch into a double contact switch, and when the button is pressed, there is a free dry junction signal, which drives the visual signals such as flashing lights or ringtones.
6). For the old-fashioned direct view interphone， there must be no objects close to the back of the host, otherwise, there will be a beeping sound, why?
A: This is a typical speaker and microphone self-excitation phenomenon. Generally, the wave transferred by the speaker touch the objects, the sound waves will be sent back thus generate self-excitation phenomena. The fault cause is that the speaker is too sensitive. You can change a potentiometer and try to adjust the speaker’s sensitivity and make the lower the speaker’s sound. You can also adjust the microphone’s sensitivity and change the direction for testing. You can solve out the problems after adjusting the equipment.
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