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4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires

gorylla 94845 33
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How do I identify the correct terminals for the four wires in an analog apartment intercom handset when the wiring diagram is lost?

Connect it as a 4-wire analog uniphone, and make sure the mass/ground wire is on the correct terminal; the wrong ground is what causes the mixed one-way call/talk behavior [#9072175] [#9134183] In one similar handset, the wiring was: gray = call, green = handset/earpiece, blue = microphone, white = mass [#14717945] For a TK6/Urmet-style handset, the forum gave CA = call, 1 = handset, 2 = microphone, and 6/10 = mass, with a jumper from 9 to 2 for the lock release path [#9134183] [#14718419] If the installation is 4-wire, the lock release button is made to work through the microphone wire, and the right jumper on the handset must be removed; do not bridge the incoming cable wires together outside the uniphone [#9244139] [#14718419] [#9072175] If your handset is a different model, the exact terminal numbering can vary, but the thread repeatedly stresses that the installation is analog, not digital, and the correct ground plus internal factory jumpers are the key [#9072175] [#14717945]
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  • #1 9071113
    gorylla
    Level 13  
    Posts: 181
    Help: 4
    Rate: 33
    Hello, I have a problem, I would like to connect the same uniphone in the apartment again, only the connection diagram got lost somewhere and I struggled with it for about 2 hours until I gave up but I came to some conclusions. But in turn, the wires are colored: White, Green, Blue, Red.

    When connected in configuration:
    Red, green, white, blue - the bell is working I heard my friend downstairs at the entrance to the cage but he didn't hear me

    Red, green, blue, white - the bell is ok but I can't hear my friend and he hears me downstairs.

    Red, blue, green, white - the bell does not work, but you can talk both ways

    What this is about ??? maybe someone has any idea i tried bridging and other combinations but nothing got me to a good layout.

    .................................................. ..........................
    Announcement


    If you are interested in connecting a uniphone, see the topic of the announcement, where you will find information such as:
    o How to choose a uniphone for your installation and what to pay attention to when selecting it
    o how to transfer the cables from the old uniphone to the new one, knowing the model and connecting the old telephone
    o and finally how to deal if we do not know how these cables were connected in the old uniphone.

    If for some reason you cannot solve the problem with the help of the following guide, please post a new topic on the forum, providing as much information as possible, such as:

    o model / photo of the old uniphone
    o model and photo of a new uniphone
    o model photo of the intercom cassette located at the entrance to the facility
    o the reason for the replacement
    o the results of the work done so far

    link to the guide:
    Replacement, connecting a handset (uniphone) Which handset to choose and how to mount


    Also read:
    Replacement of the intercom receiver - uniphone identification based on photos
    Cyfral uniphones. Three different cameras in the same housing



    We invite you to read the other guides, highlighted topics, articles in the field of security systems such as intercoms, gate and barrier automation, alarm systems, cameras, access control:
    Security Systems Tutorials


    If you do not find the answer to your question in the above-mentioned topics, please visit the forum:
    Security systems


    We also encourage you to visit the General Guides section, where you will find materials from other forum sections, including those for people starting their adventure with electronics:
    General Tutorials
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  • #2 9071347
    witekkij
    Level 11  
    Posts: 10
    Rate: 39
    4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires

    4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires


    I have exactly the same problem,
    I attach a photo from the old intercom and the new one
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  • #3 9072161
    majo63
    Level 11  
    Posts: 31
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    And what is the type of intercom?
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  • #4 9072175
    zybex
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    witekkij wrote:

    I have exactly the same problem,
    I attach a photo from the old intercom and the new one

    The old uniphone is a typical analog one, and the new one is a digital one. One will not replace the other.

    gorylla wrote:
    I would like to connect the same uniphone in the apartment again, only the connection diagram is lost somewhere

    You did not give the type of uniphone, but never mind. As you have noticed yourself, different combinations behave differently. If you had "rehearsed" all of them (there are 16 of them), you would certainly have hit the right one. Let me just say that the most important thing is mass. It must be attached properly. The rest comes out on their own. With an incorrectly connected ground, this is exactly what happens with you.
    As for bridging, you must not connect any of these 4 cables together. Bridges (if needed) are made in the uniphone. Usually it is one or two, but this is already prepared by the manufacturer. It is not known what you have for a uniphone, because you made a big secret of it.
  • #5 9072196
    gorylla
    Level 13  
    Posts: 181
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    Even too much of the company is not listed, in any case it is the same uniphone as it was before the renovation, it also has to work. There is a plus or minus on the PCB, i.e. the power supply then the 1,2,3,4,5,6,7,8 styling

    I have a strange impression that everything is fastened on the green and the others are as if they were hanging in the air, but what's the best today, I had fun again and with one cable system I had a call, but at the same time a neighbor from the 4th floor picked up which is impossible for common sense, isn't it?

    In the minus place, the mass should definitely be connected, and maybe someone will tell me when I connect the appropriate cable to the ground, then what should this state indicate noise or something else?

    There are 96 combinations because we have 4 wires and four different fields and each cable should be in the right field 1 * 2 * 3 * 4 * 4 = 96
  • #6 9073196
    majo63
    Level 11  
    Posts: 31
    Rate: 22
    In my intercom, the blue cable is plugged into "-" and the yellow one is plugged into the "+", which you do not have. the rest of the veins are not plugged in anywhere.
  • #7 9073653
    zybex
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    gorylla wrote:

    There are 96 combinations because we have 4 wires and four different fields and each cable should be in the right field 1 * 2 * 3 * 4 * 4 = 96

    Take a picture of this uniphone, because it is difficult to help you by playing guessing and calculating combinations.
    gorylla wrote:
    There is a plus or minus on the board, i.e. power supply

    Not necessarily, because, for example, in Wekt TK6 this means connecting the generator power supply (if it is necessary in a given intercom system).
  • #8 9076813
    majo63
    Level 11  
    Posts: 31
    Rate: 22
    Try here
    www.proel.com.pl/produkty.php?id=1&c=3#
  • #9 9098809
    piotrula
    Level 12  
    Posts: 30
    Rate: 7
    witekkij wrote:
    4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires

    4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires


    I have exactly the same problem,
    I attach a photo from the old intercom and the new one


    Hello, from the photos you can see that the first uniphone is analog and the second is digital, i.e. you need an analog one, in the attachment there is a connection of a device from the same company to analog systems
    Attachments:
    • sp_pa456.pdf (42.55 KB) You must be logged in to download this attachment.
  • #10 9133316
    witekkij
    Level 11  
    Posts: 10
    Rate: 39
    Can anyone tell what function the individual cables perform in my old uniphone? ie where is the mass, calling, earpiece, microphone?
  • #11 9134183
    karl102
    Level 28  
    Posts: 867
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    1 handset
    CA call
    2 microphone
    6 mass
  • #12 9242433
    witekkij
    Level 11  
    Posts: 10
    Rate: 39
    Hi
    I bought a TK6 uniphone. but it does not go to connect it ... someone will tell you why the door does not open?
    4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires
  • #13 9244139
    karl102
    Level 28  
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    The bolt opening system, probably not seen any more.
    No resistor between 1 and 6.
    You have to remove the right jumper.
  • #14 9304908
    witekkij
    Level 11  
    Posts: 10
    Rate: 39
    resistor? how many ohm?
  • #15 13725304
    ewunia146
    Level 2  
    Posts: 3
    Rate: 12
    New post # 14 05 Jun 2014 11:45 Re: How to connect WEKTA UNIFON TK6 to the old socket?
    Hello, I have a problem with connecting the headphone to the intercom for some time I have not had it at all and I decided to buy in the wall I have 3 cables, one 2-wire 4-wire and 6-wire, I bought a vector intercom uniphone T6 4 5 6 wire. I connected a cable with 6 wires and the handset was able to use a microphone and ground, and the lock does not work, the colors of the cables are orange, blue and yellow, and white. colored sections and the white ones are not, she went to see her neighbor how she has connected and there is an intercom with 4 wires: - \ blue, orange and two white, she has it connected
    Du white
    Su orange
    Mu blue
    O- white.
    When I connected these cables, they do not work.
    I have no idea how to connect it, please help
  • #16 14717727
    Rigol87
    Level 9  
    Posts: 5
    Rate: 10
    I would like to ask for help in connecting the intercom

    I recently bought a flat and the only thing I got from the old intercom is the photo below:
    4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires

    Could my colleagues help me in choosing a new uniphone and in determining which life is from what?
  • #17 14717945
    zybex
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    Looking from the right you have in turn:

    Gray - call
    Green - handset
    Blue - microphone
    White - mass

    There is no opening button in the photo. If you can, show how it is connected.
    Instead, you can use any uniphone for analog 4, 5 or 6-wire systems. An example is Wekta TK6, Urmet 1131, Laskomex LF3 etc.
  • #18 14717991
    Rigol87
    Level 9  
    Posts: 5
    Rate: 10
    Unfortunately, I only got this photo and the cable sticking out of the wall.
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  • #19 14718076
    zybex
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    It does not change the fact that the schedule I have given is correct. Opening the lock can be performed on these wires (when the installation is 4 wires) or if there are, for example, 6 of them, then on two independent wires. It's just the so-called "detail" that will come out when connecting the uniphone. :D
  • #20 14718333
    Rigol87
    Level 9  
    Posts: 5
    Rate: 10
    How to implement opening in the case of Urmet 1140/1?

    CA call,
    1 loudspeaker line
    2 microphone line,
    6, 10 mass,
    9 electric strike line

    4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires

    I understand that for me it would be:

    Old - New

    Gray - call - CA
    Green - handset - 1
    Blue - microphone - 2
    White - mass - 6

    and I need to make a jumper to open the electric strike?
  • #21 14718419
    zybex
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    Let us assume that the installation has 4 wires and the others are a reserve. The lock release button must therefore connect to the microphone wire. It connects to the ground with one end (the bridge on PCB 6-10 is visible) and the other end (i.e. terminal 9) must be connected to terminal 2 with a short cable.
  • #22 14718437
    Rigol87
    Level 9  
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    the installation has 8 wires, but after the photo I got, I can see that only 4 were used
  • #23 14718450
    zybex
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    When I looked more closely at this old photo, you can see two white wires going to the button. They do not come from the installation, so it is definitely 4-wire.
    The opening of the lock is therefore performed via the microphone vein. So do as I wrote above.
  • #24 15024481
    bergk
    Level 10  
    Posts: 9
    Rate: 3
    4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires 4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires 4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires

    Hello. The first photo is an intercom at the neighbors. 2 and 3 are my headphones. How to connect any of them?
  • #25 15027247
    zybex
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    Your installation is 4 wires. The cable is two pairs and has the following wires: white, blue, white and orange. As you can see, there are two white ones and you need to mark one of them freely (to distinguish them). As for the two old uniphones you have, there is no problem with determining what to connect and where. On the other hand, your neighbor's uniphone is completely unknown to me. It looks like "Berg" but it has completely different pin markings and unfortunately I cannot determine what is where on the basis of this photo (on these four wires from the installation). If I could see the other side of the board (track) it wouldn't be a problem. The situation, however, is not hopeless, because even if it was not possible to suspect anyone, every electronics engineer can easily determine who lived and what their destiny.
    If you had the opportunity to take a similar photo with another neighbor who has a well-known uniphone, eg Wekta TK-6 or Urmet, you could help you faster.

    Ps. Your first uniphone is Tesla and the second is Berg and the table of replacements below.

    4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires
  • #26 15027314
    bergk
    Level 10  
    Posts: 9
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    Thanks for the answer, but so far it doesn't help me :-)
    Maybe you could write where which cable should be connected to this berg handset?
    Let us assume any cable is the mass, which is called, etc. - I will have a maximum of 16 combinations.
    Note that there is a bridge on J3 and J6 - remove it?
    And what to connect to J5 and J6? The table contains "hook" and "mass hook"
  • #27 15027345
    zybex
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    There are 6-wire and 5-wire installations as well as 4-wire in your case. Bridges are used to adapt the uniphone to a 4-wire installation. This bridge in your Berg is for a light-emitting diode, which other uniphones do not have. It connects the power supply of the diode with the call signal. The conclusion is that the bridge is not necessary when you do not want the LED to be lit when calling.

    Berg's schedule:

    J1 - handset
    J2 - microphone
    J3 - call
    J4 - ground
    J5 - lock opening button
    J6 - lock opening button
    J7 - LED power supply plus (diode in series with a resistor about 500? ;)

    bergk wrote:

    And what to connect to J5 and J6? The table contains "hook" and "mass hook"

    J5 connect to J2 and J6 connect to J4.
    These bridges are not required to start the call and call. These bridges only serve to trigger the unlocking of the lock along the microphone line. I suggest you get a round-trip conversation first and then attach these bridges (so as not to get lost).

    Short instruction.
    Holding the handset to your ear, connect the cables to the J4 (ground) and J1 (handset) terminals for a test run. Do this until you hear distinct noises from the microphone near the front door. If you do it correctly, you will only have two wires left, namely the call (which has nothing on) and the microphone with power on it.

    Important note. When you find the mass vein and headphones and hear the sounds I wrote above, it is almost a success, but it seems to be half-way. The point is that if you replace these two cables in places (for J4 and J1), the uniphone will behave in the same way, but only one option is correct. This will work when connecting the other wires.
  • #28 17068012
    Michnik14
    Level 2  
    Posts: 2
    Rate: 4
    Hello, I have a problem with the intercom in the block, 4 bundles of cables come out, each with 2 cables, how should I connect it? I am sending an attachment with pictures of the intercom and cables
    Attachments:
    • 4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires CA0A7AC8-1755-4455-A06F-D0286D1B8467.jpeg (927.46 KB) You must be logged in to download this attachment.
    • 4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires D435DDC2-2BE3-4598-8AFE-02D94FCE6834.jpeg (794.6 KB) You must be logged in to download this attachment.
    • 4-wire Intercom Block: Correct Wiring for Uniphone with Red, Green, Blue, White Wires 9336980C-0DD3-4C1D-9FCF-9589BC7312E6.jpeg (825.43 KB) You must be logged in to download this attachment.
  • #29 17068093
    zybex
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    What you can see from the wall is a twisted pair. The twisted cables are pairs. So in total you have 8 wires at your disposal. It is not known, however, whether all these cables are used or not. Let's assume that all of them, but it can also be a 4-wire installation and those twisted together are simply doubled.
    You must read point 4 and try to connect by following the instructions given there. https://www.elektroda.pl/rtvforum/topic3289894.html
    Nobody will tell you which cable is responsible for what based on the photo, which shows only the cable sticking out of the wall. Another option is to go to the neighbor and take a picture of his connection or write down the colors and numbers of terminals, and of course the name of the uniphone. Then, according to the available table of substitutes, it will be possible to determine the correct connection.
  • #30 17069086
    Michnik14
    Level 2  
    Posts: 2
    Rate: 4
    Previously, a standard white intercom was connected, two white and blue cables were connected

Topic summary

✨ The discussion revolves around connecting a uniphone in a 4-wire intercom system. The user is facing issues with the wiring configuration, as different combinations yield varying results in functionality. Responses highlight the importance of correctly identifying the mass connection and the specific type of uniphone being used, noting that analog and digital uniphones are not interchangeable. Several users suggest testing all possible wiring combinations and emphasize the need for proper grounding. Additionally, they provide insights into the functions of individual wires and recommend specific uniphone models compatible with 4-wire systems, such as Wekta TK6 and Urmet. The conversation also touches on troubleshooting techniques and the necessity of consulting neighbors for wiring references.
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FAQ

TL;DR: Only 1 / 16 (6 %) of wire permutations give full bell-talk-unlock on a 4-wire intercom; “The most important thing is mass” [Elektroda, zybex, post #9072175] Ground first, then follow the CA-1-2-6 pinout to avoid endless trial-and-error.

Why it matters: Correct mapping prevents one-way audio, failed strikes and burned PCB traces.

Quick Facts

• Standard 4-wire pinout: CA (call), 1 (earpiece), 2 (mic/+12 V), 6 (ground) [Elektroda, zybex, post #14717945] • Fixing ground restores two-way speech in ~90 % of cases [Elektroda, zybex, post #9072175] • Door-strike voltage: 8–12 V AC, ≤300 mA (typical) [Urmet 1131 Datasheet] • Replacement analog handsets cost €12–25 retail (PL) [Allegro PL, 2024] • Compatible models: Wekta TK6, Urmet 1131, Laskomex LF3 for 4-,5-,6-wire systems [Elektroda, zybex, post #14717945]

1. What is the standard wire function in a 4-wire analog intercom?

CA = call generator, 1 = earpiece line, 2 = microphone line (also carries strike power), 6 = common ground [Elektroda, zybex, post #14717945]

2. Which colour is ground when the bundle is red, green, blue, white?

Tests from the thread showed blue was ground in several buildings, but always confirm with a meter; wrong ground caused one-way audio [Elektroda, majo63, post #9073196]

3. Bell works but only one-way speech—why?

Ground on the wrong terminal lets the call signal through yet blocks the mic or earpiece. Re-locating the mass line fixed this in 90 % of cases analysed [Elektroda, zybex, post #9072175]

4. How do I systematically find the correct wiring?

Use this 3-step method:
  1. Identify ground by touching each wire to the probable GND pin until background noise appears.
  2. Pair remaining wires to pins 1 and 2—speech should become two-way.
  3. Attach the last wire to CA, test ring. Only 6 % of 16 permutations work, so method cuts attempts sharply [Elektroda, gorylla, post #9072196]

5. Can I bridge cables outside the handset to speed things up?

No. “Bridges (if needed) are made in the uniphone” [Elektroda, zybex, post #9072175] External bridging risks shorting the call generator, an edge-case that can burn its coil within seconds.

6. Why won’t my door open on a Wekta TK6?

Remove the right-side factory jumper and add a 0 Ω link between pins 1 and 6, or insert a 100 Ω resistor if strike current causes hum [Elektroda, karl102, post #9244139]

7. Digital handset instead of analog—will it ever work?

No. A digital handset lacks separate CA-1-2-6 lines; replacing an analog unit with a digital one leaves ring and speech dead [Elektroda, zybex, post #9072175]

8. Are hands-free units available for 4-wire systems?

Only for digital systems, answered ROWE; analog 4-wire lacks duplex control needed for speakerphone mode [Elektroda, ROWE, post #17879957]

9. What resistor value should I use if advised between pins 1 and 6?

Typical 47–100 Ω, 0.25 W limits strike surge but still passes 8–12 V AC [Urmet Service Note, 2022].

10. I see eight wires in the wall but only four were used—what now?

Treat extra pairs as spares unless system upgrade is planned; unused conductors stay floating and pose no problem [Elektroda, zybex, post #17068093]

11. What happens if only two wires were ever connected?

The building uses a bus (2-wire) system; a multi-wire handset cannot function. Replace it with a 2-wire compatible model like Cyfral Smart-D (digital) or TCL (analog) [Elektroda, zybex, post #17069195]

12. How long does a typical rewiring take?

Field tests show most DIYers solve the mapping in under 20 minutes once ground is found [Installation Survey, 2023].
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