Audio Intercom 1-Button Outdoor Station & Indoor Handset – Connection Guide

A simple, reliable, and cost‑effective entry communication solution for single‑family homes, small offices, and residential buildings.

Not every entrance needs video. For many applications – a single‑family home, a small office, or a secondary entrance – a clear, reliable audio intercom is all you need. With just one button on the outdoor station and a simple indoor handset, visitors can call residents, and residents can talk and unlock the door – all without the complexity of video, Wi‑Fi, or smartphone apps.

This guide covers everything you need to know about connecting and using a 1‑button audio intercom system – from wiring basics to troubleshooting tips.

Why Choose a 1‑Button Audio Intercom?

Audio intercoms remain one of the most cost‑effective and reliable entry communication solutions available. Here is why they are still a popular choice:

• Simple installation – Most systems use just two wires between the outdoor station and indoor handset. No network configuration, no IP addresses, no complex setup.
• No internet dependency – Works without Wi‑Fi, cloud services, or smartphone apps. Reliable communication, always.
• Low cost – Significantly cheaper than video or IP systems – both in hardware and installation.
• Low maintenance – Fewer components mean fewer things that can fail. No firmware updates, no battery changes.
• Easy to use – Visitors press the call button. Residents pick up the handset and talk. Everyone understands it instantly.

Best for: Single‑family homes, small offices, duplexes, secondary entrances (garages, garden gates), and budget‑conscious residential projects.

What’s in the System?

A basic 1‑button audio intercom system consists of three main components:

Step‑by‑Step Connection Guide

Important: Before starting any wiring, disconnect power to avoid damaging the system. Always follow the specific wiring diagram provided with your kit. Incorrect wiring can damage the system.

Step 1: Plan Your Installation

• Outdoor station – Mount near the entrance at approximately 1.4 to 1.5 metres (eye level). Choose a location sheltered from direct rain where possible.
• Indoor handset – Mount inside at a convenient location – hallway, living room, or kitchen – where you can easily hear the ringtone and answer calls.
• Plan the cable route between the outdoor station and indoor handset (typically up to 100‑150 metres with appropriate cable).

Step 2: Choose Your Cable

Most 1‑button audio intercom systems use 2‑wire connection between the outdoor station and indoor handset. Suitable cable types include:

• Twisted pair cable (e.g., Cat5 or telecoms wire)
• Doorbell wire (2‑core)
• Standard 2‑core cable (≥0.5mm²)

Tip: For longer distances (over 50 metres), use heavier gauge cable (e.g., 0.75mm² or 1.0mm²) to reduce voltage drop.

Step 3: Connect the Outdoor Station

1. Mount the outdoor station securely to the wall or gatepost using the included bracket.
2. Connect the two‑core cable to the terminals on the outdoor station. Terminals are typically marked 1 and 2 for communication/power.
3. If a lock is connected, the outdoor station will also have terminals for lock control (typically NO and COM for relay output).

Note: For 4‑wire systems, terminals 1, 2, 3, and 4 of the outdoor station connect separately to the corresponding terminals on the indoor handset.

Step 4: Connect the Indoor Handset

1. Mount the indoor handset on the wall using the included bracket.
2. Connect the two‑core cable from the outdoor station to the corresponding terminals on the indoor handset (typically marked 1 and 2).
3. If connecting an electric lock, connect the lock wires to the unlock relay terminals on the handset (typically NO and COM).

Step 5: Connect the Power Supply

1. Connect the power supply to the indoor handset (most systems power the outdoor station through the handset).
2. Plug the power adapter into a wall outlet.
3. Check the LED indicator on the outdoor station and indoor handset – they should light up, indicating power is supplied.

Step 6: Test the System

1. Press the call button on the outdoor station. The indoor handset should ring.
2. Pick up the handset (or press the talk button) – you should hear clear two‑way audio with the visitor.
3. Press the unlock button – the door lock (if connected) should release.
4. Adjust volume if necessary – most handsets have volume controls for both ringtone and speech.

Wiring Diagram – Simplified

[Outdoor Station] <--- 2‑core cable ---> [Indoor Handset] <--- Power Supply
       │                                           │
       └─── [Electric Lock] (optional) ────────────┘

Terminal connections (typical 2‑wire system):

Common Features & Functions

One‑Button Calling

Visitors press the single call button on the outdoor station. The indoor handset rings immediately – no directory, no codes, no confusion.

Two‑Way Audio

Full‑duplex audio allows natural conversation between visitor and resident. The outdoor station’s weatherproof speaker and microphone ensure clear communication even in noisy or windy conditions.

Remote Unlock

Residents can unlock the door by pressing the unlock button on the indoor handset. Compatible with most electric locks – electric control locks, magnetic locks, and electric strikes.

Adjustable Ringtone & Volume

Most handsets allow adjustment of ringtone volume and speech volume to suit the environment.

Troubleshooting Common Issues

Why Choose FARHD Audio Intercoms?

FARHD is a professional OEM/ODM manufacturer with over 28 years of experience in video intercom R&D and manufacturing. Since 1998, we have been delivering high‑quality video door phone systems and one‑stop solutions to clients worldwide.

• Founded in 1998 – 28+ years of intercom expertise
• Source factory – Competitive pricing, full quality control
• OEM / ODM supported – Custom logo, packaging, and software language available
• Global reach – Serving clients in over 90 countries
• No MOQ for trial orders – Start with a sample; scale as you grow

Ready to Install Your Audio Intercom?

The 1‑button audio intercom system is the simplest, most reliable way to add entry communication to your home, office, or residential project. With just two wires and a few basic connections, you can have clear, reliable communication between your entrance and indoor spaces – no internet, no apps, no complexity.

Contact us for catalog, pricing, or to request a sample.

Website: www.farhd.com
Email: info@farhd.com