How does the intercom key work and why does it work

Intercom codes

Intercom name	Code to open
Visit	*#423, 12#446, 66#879. Each code must be tried individually.
Metacom	65545, B1235, B349. Also, the code can be entered specifically for the desired apartment, if the person has such information.
Cyfral	There are no pre-prepared universal codes.The intercom can only be opened by entering the code for a specific apartment, which is stored in the device's memory when it is installed.
forward	23597541. K1236, K3321556 may also work.
Eltis	24654 and enter button, or 3434 and enter button. Characters are typed one by one in the specified sequence one after another.
Factorial	Press button 5 and then dial 134567.
Marshal	Dial the number of the last apartment in the entrance, press the K button and enter 4444 or 1953.

Universal key for intercom: do it yourself

Several options for keys are produced for modern intercom systems. Their main task is to open the entrance lock with the established protection control. All of them are programmed with a specific factory code. If the firmware was changed during operation, in this case only the service department will be able to help unlock the system. After their intervention, it will be necessary to re-program the device.

Firms that are engaged in programming locks use a special technology for opening devices:

• contactless;
• tablet-chip;
• all-terrain vehicle;
• universal key for intercom.

With the help of the latter, you can open up to 95% of the models. It is convenient to use, as with its help you can quickly solve the issue of opening doors. It is these devices that are used by service workers or postal workers.

There is another way to open intercom devices using a universal key - a contactless master key. To do this, there is no need to apply it to the contact on the panel. The principle of operation is at a distance. She has one significant drawback - high cost.

Intercom service

Usually, public intercoms are installed centrally through the housing office, after which a subscription service agreement is concluded with the residents of the entrance. The amount of the monthly payment is not too large, and such an agreement brings tangible benefits. The subscriber service of the intercom, in addition to routine inspections, also includes the elimination of almost all malfunctions of the common use unit, the replacement of the keyboard, the repair of the power supply, the elimination of malfunctions in the switching lines and the emergency arrival of the master. If the intercom does not work, you should immediately call the phone number specified in the contract.

The subscription service does not include the following items:

• Subscriber handsets
• Electronic keys
• Door leaf

Electronic keys are made independently, to repair the door you need to invite a locksmith, and the subscriber handset will be repaired for a fee.

Universal key for intercom: do it yourself

Several options for keys are produced for modern intercom systems. Their main task is to open the entrance lock with the established protection control. All of them are programmed with a specific factory code. If the firmware was changed during operation, in this case only the service department will be able to help unlock the system. After their intervention, it will be necessary to re-program the device.

Firms that are engaged in programming locks use a special technology for opening devices:

• contactless;
• tablet-chip;
• all-terrain vehicle;
• universal key for intercom.

With the help of the latter, you can open up to 95% of the models. It is convenient to use, as with its help you can quickly solve the issue of opening doors.It is these devices that are used by service workers or postal workers.

The key called "all-terrain vehicle" can also be attributed to the universal ones. Utility workers may not be carrying around large bundles of chips. It is enough to have one universal. The programming device is located in the chip, it is enough to attach it to the contact located on the input panel.

There is another way to open intercom devices using a universal key - a contactless master key. To do this, there is no need to apply it to the contact on the panel. The principle of operation is at a distance. She has one significant drawback - high cost.

How to make a universal device yourself

Such a device is not difficult to perform for someone who is familiar with programming and has the skills of a radio mechanical engineer. You need to know the name of the model. Information about which blank is suitable can be found on the Internet. There are also tables for combining the duplicator and blanks.

Making a new device takes a few seconds. To do this, you need an “emulator” device. This is a device that opens almost all intercom systems, with a few exceptions.

But even the most professional wizard, the best software and emulator may not be able to handle some devices. It is necessary to personalize the emulator for a certain version, then the cipher will be easily selected for this model.

Key Duplicator

Benefits of opening an intercom system with an opening code

Using the opening code is a reliable and popular method. Residents of apartment buildings mostly use it. Let's look at why.

The code is issued to all residents, for each apartment when installing an intercom in the entrance, without additional payments.You can use it without buying a key and without installing a subscriber handset and unit.
The cipher does not look like a thing, you do not need to carry it with you, you cannot forget it in another jacket, bag or lose it. It's easy enough to remember.
The code does not need to be taken out of the bag in front of the door, from the pocket, found in the keychain. We dial the numbers on the intercom panel - and the front door is unlocked.
There is no need for human assistance. call, wait, talk, ask

And it doesn't matter if the person is at home or not. We're just typing the code.
The code can be transferred to another person

And he will enter quickly, without delay and without disturbing anyone.
The code is more reliable than a tube that may stop working and require repair.

Today, there are a number of professions that involve the frequent opening of intercom systems during the day to perform immediate duties. These are postmen, posters, firefighters, doctors, couriers and other employees.

Often each time asking to open the door or waiting for an incoming, outgoing person from the entrance is long and difficult. Precious time is wasted, you are nervous, worried. Naturally, with such constant difficulties, the question arises - how to open the intercom quickly, without having a code and a key?

Intercom programming Metakom

• during the installation of the electronic system, the master changed the factory settings and flashed it;
• the key has been damaged or lost.

Knowing certain codes, it will not be difficult to do this.

Dialing scheme (B is the call key)	Target
65535 - B - 1234 - xxx - c - 7	Adding your apartment number (xxx) to the intercom memory
65535 - B - 1234 - B - xxx - B - 0 - yyy - B	Setting a new code for a specific tenant (xxx - apartment number, yyy - new password)
65535 - B - 1234 - B - B - xxx Then attach a pill and dial B - 7	Adding your key to the list of magnets that open the apartment
65535 - B - 1234 - B - B - xxx - B - 7 - 0 - 11	Removing all chips from the device memory
65535 - B - 1234 - B - B - xxx	Creating a universal master key
65535 - B - 1234 - B - B - xxx - B - 0 - zzz - B	Changing the login password for keyless access (zzz - new password)
65535 - B - 1234 - B - 97111	Deleting all master keys
65535 - B - 1234 - B - 99	Adding a new ID to the intercom memory

How to choose the right electronic key

Various principles of operation and protocols, a large number of design options, many manufacturers and (important!) The possibility of uncontrolled copying of some key models - all this makes the selection task very difficult. In this material, we will try to give you information on electronic keys, which will allow you to make the right choice.

In this material, we will try to give you information on electronic keys, which will allow you to make the right choice.

Electronic keys are an indispensable attribute of a modern access control system. The range of application of electronic keys is extremely wide: intercoms, security alarms, turnstiles and other access control systems.

An electronic key is, in fact, a special microcircuit containing a strictly individual code and “packed” in some kind of case. Sometimes we call electronic keys “magnetic tablets”, which, of course, is wrong. And if the appearance of such a key also resembles a “pill”, then there is certainly nothing magnetic in it.

Electronic keys differ in the following parameters:

• the format and length of the transmitted code message (this is the code contained inside the chip)
• way of transmitting information: there are contact (the key must directly touch the special reader) and non-contact (they work at a certain distance from the reader, usually up to 1 cm)
• type of case used: there is a wide variety of different key chains, “pills”, “plates”, bracelets, etc.

When using electronic keys, the obligatory part of the system is:

• key reader (in fact, the key itself is brought to it); the reader can be made as a separate device, and can also be built into some other device (for example, an intercom)
• key controller - the “brain” of the system (remembers the codes of all “its” keys and, accordingly, gives a command to open the door or operate any other actuator
• power supply (provides the necessary voltage to the reader and controller).

What do you need to know to make your own key?

The first thing you need to know to make a key with your own hands is the key device. Some people think that there is a magnet in the tablet, when it comes into contact with the identifier, the lock is demagnetized and the door opens. In fact, this is equipment in whose memory a certain program is recorded, moreover, it is non-volatile. This technology is called Touch Memory, and it requires a single-wire connection to work. That is, at the moment the tablet touches the reader, power is received and the latter transmits its code.

The principle of operation that the intercom keys use is simple.So, touching the Touch Memory tablet to a special place on the intercom equipment, information is exchanged with the controller, which lasts about 2 seconds. If the received information matches, then everything is fine - the passage is open.

On the video - the process of making keys using a duplicator:

Blank or blank for a key

To date, there are a huge number of blanks or, as they are also called, blanks for identifiers. As mentioned above, they are contact and non-contact. Therefore, in order to proceed to the stage of preparing keys, it is necessary to decide which type of them the required intercom uses. In this case, the brand of the intercom also needs to be known.

After the indicated technical points have been clarified, you need to buy a blank: it is usually sold at the place where the keys are made. The price for them is low, however, the same identifier blanks cost differently: the higher the quality, the higher the price.

Intercom key programming

In order to enter the necessary code, you need to purchase a special electronic device called a duplicator. This device can read the code of an already programmed identifier and enter the cipher of the original key into the memory of the blank. The simplest duplicators use only common types of identifiers and are not always distinguished by the impeccable quality of the blank coding.

In addition, to work on the simplest duplicator, or copier, you need to know additional information: the intercom model, etc.Therefore, it is not always possible to achieve a positive result on such a copier from the first workpiece, but if hands do not drop, we make another duplicate of the key and, most likely, it will already work normally. The cost of such duplicators is low: about a couple of thousand rubles. All information about the compatibility of key blanks, intercoms and a duplicator is publicly available.

There are copiers that do not need to be connected to a computer. This greatly facilitates the work of a specialist and the question of where to make the keys is already removed by itself. If you describe its production step by step, it will look like this:

• Turn on the copier. An inscription will light up on it, which indicates the readiness of reading;
• Take the original of the identifier and attach it to the reading point indicated on the copier. After he considers the information, a sound signal or an inscription Write will report this;
• After that, attach a blank to the reading point and in a few seconds the key will be ready, about which the duplicator will inform you with a sound signal or an inscription.

If we take into account professional duplicators, then they have much more technical characteristics than those indicated above. So, they can make a copy of the key for almost any intercom, and the workmanship will be at a higher level.

They can bypass a special filter installed on the intercom, finalize the key, and using even cheap blanks, you can get excellent copies.

Now the question of how to make an electronic identifier will not confuse you and, as it turned out, this is not such a difficult matter.If the made product does not work, then you should seek help from a specialist. It should be remembered that the production of identifiers for criminal purposes is punishable by law.

Intercoms Eltis

The logic is the same - entering combinations:

"B" - 100 - "B" - 7272
"B" - 100 - "B" - 7273
"B" - 100 - "B" - 2323.
"B" - call button.

If that doesn't work, you can try 200, 300, 400, etc. instead of 100.

Sometimes the combinations 9876 - "B" or "B" - 12342133123 help.

If the installers have changed the standard codes, you can try to find out the new value. Press "B" and wait 20 seconds. Five digits will appear on the screen for a fraction of a second. Memorize them or shoot a video on your smartphone. The numbers can be used in combinations above.

1. Hold down any number, while on screen CODE will not appear.

2. Enter 1234 (default password).

3. If it has not been changed, FUNC. will appear on the screen.

4. To set a new code, press 1 and enter a new combination.

5. Press 2 and confirm it (enter the same value again).

6. Press 6 to reset special settings and 0 to exit the menu.

Is it possible to fool the intercom?

Yes, now you can buy an emulator that simulates keys of different types and gives the right value for each intercom. The emulators even have displays and a keyboard installed, which allows you to select the desired key and display its name.

The thing is funny, it costs about 10 thousand rubles. But it does not work without problems - it bypasses not all protection, sometimes it may not work.

And yes, by itself, she will not crack the intercom, she will only pretend to be a copy of the desired key. To program it, you will still need the keys themselves, which are already known by the intercom, and a duplicator device.

You can often hear that the intercom can be disabled with a stun gun. Yes, thin electronics really will not endure a serious charge. A mechanical shock 10-15 cm below the intercom panel has the same consequences. But this is damage to property and an article of the Criminal Code of the Russian Federation.

Theoretically, you can still pull the door hard on yourself. But to overcome the force with which the magnet holds the second part of the lock, remarkable power is required.

Some turnkey intercoms can be opened using a krone battery. The method is humane and safe for the intercom, but rarely works.

How does the code work?

Opening the intercom with a code is one of the main methods along with opening with an electronic key. The company that installs intercoms in the entrance, as a standard, assigns an opening code to each apartment. The combination consists of an apartment number, a button to go to the code and a cipher dial. By default, this is 3-4 digits. Given that only one match is an apartment - the code is correct, there are a lot of variations, therefore, the level of security is definitely high.

When consecutively entering the correct numbers and characters on the digital display of the device, the lock is triggered to open, which is notified by a sound signal. It remains only to pull the door by the handle and enter.

It is worth noting that there is no universal (emergency) opening code for intercoms.

What kind of locks are in intercom doors?

Appearance of the electromechanical lock

Entryways with intercoms usually have either electromagnetic or electromechanical locks.

An electromagnetic lock is a coil of steel core cable that is usually installed in a door frame. When voltage is applied to the coil, it attracts a polished metal plate fixed on the door leaf.

Typically, an electromagnetic lock is powered by a DC source. The higher the power of the lock, the more difficult it is to tear the door leaf from the box.

But if the electromagnetic lock is old or cheap, you can try to forcefully pull the door towards you. Some models are designed for a holding force of only 50 kg (but more often 700 kg or more). It is not so much the strength that is important, but the sharpness of the jerk.

This will not work with an electromechanical lock. Here the bolt and the latch go into the grooves on the door frame, you can’t get them out of there by jerking the door.

Another option is to take a powerful electromagnet. You need to position it with reverse polarity to the retaining plate in order to compensate for the field from the coil.

Where to get and from what to power the electromagnet, history is silent ...

Finally, intercoms are sometimes opened with an ordinary lighter. It is necessary to remove the piezoelectric element from it and strike a spark several times on the key reader. But this is fraught with damage to the intercom.

The principle of operation of the intercom system

The device is quite simple and consists of only a few components:

• call block. It is presented in the form of a panel protected from dust and moisture penetration;
• an internal zone, which includes an intercom (call key, microphone and loudspeaker) and a door station;
• latch lock;
• subscriber complex. It is made in the form of a tube and is installed in the owner's apartment, or at the reception in the office. On it are located: control button, microphone and speaker;
• magnet with a chip.

The intercom can be provided with an audio or video signal. All elements are connected through a switch.

The intercom device works by analogy with a relay connection as follows:

• the guest presses the "Call" button on the external panel;
• contacts are closed, the signal reaches the subscriber complex of the owner;
• the host of the receiving device presses a button to negotiate;
• by the decision of the owner, he can, by pressing a button, unblock the entrance system or refuse to accept.

Manufacturers initially set a password to open the door mechanism. When installed at the request of the owner, it can be replaced either on the main unit remote control or through software.

Protective system device

Intercom key - device and disassembly

Intercoms have covered most urban dwellings, intercoms are different and the keys to them are accordingly different … But their principle of operation is generally the same. They are divided into a couple of groups, today I will disassemble one such key-fob, probably one of the most widespread types.

It is based on passive type RFID contactless technology - Radio Frequency IDentification. The principle of operation of such a device is widely described on the Internet, so I will not repeat myself. Devices based on this principle are widespread and in addition to intercom keys, for example, electronic tags that cling to goods to prevent theft …

So, a drop-shaped key-fob made of strong plastic. There is an eyelet on top to hook it to a bunch of keys. On the case there is a VIZIT logo - a trademark of the Russian company VIZIT Group (by the way, the first intercoms under the name VIZIT were released back in the USSR in 1984 for wide civil use).It is relatively difficult to open it without damaging the case and without destroying the insides … I also did not succeed, well, okay, it’s good that I didn’t damage anything inside.

What's inside? — inside there is a classic filling of a passive RFID key, that is, it does not have a built-in power source, a short range: the platform is a thin brass plate on which a chip filled with a compound is located. Two leads go from it to a large coil around, wound with a thin copper wire. The coil acts as an antenna. The whole structure is filled with epoxy resin and simply glued inside the keychain body to one of its side walls.

On the reverse side, the marking 08 06 is probably the date of manufacture …

The intercom apparatus acts on a plate inside the key, an oscillatory circuit of a certain frequency is transmitted through a chip or a resistor to an inductor, which generates a meager electric current, which is sufficient to transmit a response signal to the intercom. Further, the intercom identifies the received signal with its database of registered keys and works accordingly.

In general, that's all. When disassembling intercom keys of other types, or interesting designs, this article will be supplemented with relevant material …

Mikhail Dmitrienko, specially for 2015

How can I open the intercom without a key

It takes place.

Now we will tell you how to do it on devices of different companies.

how to open a metacom intercom without a key?

A device of a similar brand is opened by selecting numerical combinations.
Required to do:

• click on the call;
• choose the number of the first apartment in a particular front door;
• press call;
• we wait for the word Cod to appear on the display;
• dial the digital code 5702.

You can also try another combination:

• enter the numbers 1234;
• press the button at number 6;
• call;
• we dial the digital key 4568.

These steps should help.

how to open intercom visit without a key?

Intercoms called "Visit" is quite possible to open without a key. To do this, you need to know the codes, and better by heart. The firmware of access devices is quite standard and installers use special passwords when installing and adjusting the circuit. So, to open a regular or video intercom, you can use a combination of the following numbers and symbols: * # 4230 or * # 42312 # 345. Please note that passwords can be changed after installation. If your driveway door device does not have an asterisk and bars, they are replaced by the “C” and “K” buttons. For the latest models, combinations *#423 and 67#890 are used.

how to open a cyfral intercom without a key?

The devices of this company are a domestic development, which has become widespread in the Russian market for similar products. It is difficult to open it without a key. To do this, use the service menu. This is done by holding any button until an inscription appears on the scoreboard. Then, one by one, enter combinations of characters, for example, 100 - call - 7272, and you need to try nine combinations (from 100 to 900). If this does not help, change the code a little by changing one digit. For example, 100 - call - 7273 and also repeat nine combinations. Or use the code table below.

If these measures did not help, then contact the installers and make a new key.

how to open intercom eltis without a key?

These intercoms are concise and reliable. They have a backlit keyboard and a function to communicate with the visitor. In a situation where the key is lost, we do this:

• press the button to call and wait for the signal;
• dial 100 - call - 7273;
• press the call and wait for the signal, dial 100 - call - 2323;
• press the call and enter the configuration 100 - call - 7272.

If necessary, apply nine combinations as with the Kifral intercom. Another way is to try to pull the door hard. From a sharp jerk, it can open.

how to open intercom factorial without a key?

The door is opened by resorting to the service menu and entering the code. To do this, we dial five digits, it can be five zeros or a combination of 123456. All manufacturers recommend changing these codes, which is not always done. There is another way. For a couple of seconds, hold down the number "5". Next we see the service message. Now we successively press 180180-call-4 and on the call. The door will unlock.

how to open intercom forward without a key?

It is almost impossible to open a Forward by selecting combinations for it. First, try to enter a duplicate key into the device's memory. We perform the following steps:

1. dial 77395201;
2.  *;
3. zero;
4.  *;
5. we attach a new key to the reading element;
6.  **;
7. ##.

It will not be superfluous to remember a few codes for opening a forward:

• 123-asterisk-2427101;
• K-1234;
• 2427101.

And best of all, do not lose the key or make yourself a duplicate.

how to open a laskomex intercom without a key?

The door opens in two ways. First: We dial the room number and press the key button, enter a four-digit password. It is individual for each apartment and will be recognized by the installers. Second: press alternately on the key and zero. We enter the password of our apartment and wait for the inscription P, then press the figure eight. If these measures did not help, you need to reprogram the device. This requires certain skills and knowledge, so contact the professionals.

This article describes the types of intercoms and the basic principles of operation.It also provides information on opening the door when the key is lost. Using this information, you will generally learn the operation of the intercom and be able to open the door without a key.

Universal codes

Taking care of customers, Metacom prudently flashes a number of universal codes for different models in the electronic filling. Their use allows:

• Unlock the security device in the absence of a key;
• Programming an electronic lock;
• Change system settings;
• Bind and unbind individual keys;
• Install and change master passwords.

Digital models with a display MK 2003, MK 2007, MK 2012 are able to respond to the following schemes:

• B - 1234567 - B;
• 65535 - B 1234 - B - 8;
• B - 7890 - B - 567890 -;
• B - 7890 - B - 123456 - B;
• B - 7890 - B - 987654 - B;
• B - 4248500 - B - 4121984 - B.

To control the coordinate models MK 10 or MK 20 (without display), the following sets of commands are suitable:

• B - 5 - B - 4253;
• B - 6 - B - 4568;
• B - 1981111.