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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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  • #31 17069195
    zybex
    Helpful for users  
    Posts: 15888
    Help: 2093
    Rate: 2916
    If only two cables were connected (white and blue), then you bought the wrong uniphone.
    You should have bought a uniphone for two-wire systems and you bought for multi-strand (4, 5 or 6). You just need to know if your system is digital or analog. The digital ones are e.g. Proel PC-255, Cyfral Smart-D, and the analog ones are e.g. Cyfral TCL, Cyfral Smart analog or similar.
    However, it is best to check with your neighbor what type it should be, so as not to buy the wrong uniphone again.
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  • #32 17069747
    karl102
    Level 28  
    Posts: 867
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    Michnik14 wrote:
    Previously, a standard white intercom was connected, two white and blue cables were connected

    This saves us only by removing the cassette at the entrance, because the standard intercom (not necessarily white) depends strictly on the type of the exchange.
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  • #33 17867405
    kasan102
    Level 1  
    Posts: 1
    Rate: 1
    Good day. I have got some questions:
    Are there any hands-free uniphones for 4-wire installations in blocks?
    I would like to ask for any suggestions.
  • #34 17879957
    ROWE
    Level 34  
    Posts: 1987
    Help: 239
    Rate: 529
    For digital system only.
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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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