{"id":8157,"date":"2026-10-21T09:40:37","date_gmt":"2026-10-21T09:40:37","guid":{"rendered":"https:\/\/farhd.com\/?p=8157"},"modified":"2026-10-21T09:40:38","modified_gmt":"2026-10-21T09:40:38","slug":"3-button-outdoor-station-video-intercom-with-3-indoor-monitors-2-wire-connection-via-2-wire-switch","status":"publish","type":"post","link":"https:\/\/farhd.com\/pt\/3-button-outdoor-station-video-intercom-with-3-indoor-monitors-2-wire-connection-via-2-wire-switch\/","title":{"rendered":"3-Button Outdoor Station Video Intercom with 3 Indoor Monitors: 2-Wire Connection via 2-Wire Switch"},"content":{"rendered":"\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-9-16 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"3 Buttons Outdoor Station Video Intercom with 3 Indoor Monitors 2-wire Connection via 2-wire Switch\" width=\"563\" height=\"1000\" src=\"https:\/\/www.youtube.com\/embed\/N0fxGPLFFGo?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>When you manage a small apartment building with three units, you need an intercom system that is simple, reliable, and easy to install. The FARHD 3-button outdoor station paired with three indoor monitors delivers exactly that\u2014using a 2-wire connection through a 2-wire switch. No complex cabling, no network configuration, no Wi-Fi dropouts. Just clear video, two-way audio, and secure door release for each apartment.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this blog, we explain how the system works, how to wire it, how to configure room numbers and button mapping, and why it is the ideal solution for small multi-unit residential buildings.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"why-2-wire-for-a-3-unit-building\" class=\"wp-block-heading\">Why 2-Wire for a 3-Unit Building?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The 2-wire system transmits power, audio, video, and control signals over a single pair of standard two-core wires. The connection is <strong>non-polarity<\/strong>, meaning you can connect the wires either way without risk of damage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key advantages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reuses existing cabling<\/strong> \u2013 often works with old doorbell or telephone wires.<\/li>\n\n\n\n<li><strong>Fast installation<\/strong> \u2013 any electrician can complete the wiring.<\/li>\n\n\n\n<li><strong>Up to 100 metres transmission<\/strong> \u2013 enough for most small buildings.<\/li>\n\n\n\n<li><strong>Cost-effective<\/strong> \u2013 lower material and labour costs.<\/li>\n\n\n\n<li><strong>Reliable<\/strong> \u2013 no network dependency, no Wi-Fi interference.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For a three-unit building, the 2-wire system is the most practical choice.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"system-components\" class=\"wp-block-heading\">System Components<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A typical 3-button 2-wire kit includes:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Component<\/th><th class=\"has-text-align-left\" data-align=\"left\">Role<\/th><\/tr><\/thead><tbody><tr><td><strong>3-Button Outdoor Station<\/strong><\/td><td>Three call buttons, one for each apartment. Includes camera, microphone, speaker, and optional card reader.<\/td><\/tr><tr><td><strong>3 Indoor Monitors<\/strong><\/td><td>One per apartment. Answer calls, view video, unlock door.<\/td><\/tr><tr><td><strong>2-Wire Switch<\/strong><\/td><td>Distributes signals to the three indoor monitors and outdoor station.<\/td><\/tr><tr><td><strong>Power Supply<\/strong><\/td><td>15V DC adapter or central power supply.<\/td><\/tr><tr><td><strong>2-Core Cable<\/strong><\/td><td>Non-polarity, \u22650.5mm\u00b2, up to 100m per run.<\/td><\/tr><tr><td><strong>Electric Lock<\/strong><\/td><td>Controlled by relay output. Requires separate 12V DC power supply.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The 2-wire switch is the heart of the system. It provides stable power distribution and isolates each indoor monitor, so a fault in one apartment does not affect the others.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"wiring-topology-star-wiring-with-2-wire-switch\" class=\"wp-block-heading\">Wiring Topology: Star Wiring with 2-Wire Switch<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For a 3-button system, the recommended wiring is <strong>star topology<\/strong> using a 2-wire switch.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">text<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">[Outdoor Station] \u2500\u2500 2-wire \u2500\u2500 [2-Wire Switch] \u2500\u2500 2-wire \u2500\u2500 [Indoor Monitor 1]\n                                                   \u251c\u2500\u2500 2-wire \u2500\u2500 [Indoor Monitor 2]\n                                                   \u2514\u2500\u2500 2-wire \u2500\u2500 [Indoor Monitor 3]<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Advantages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fault isolation \u2013 one unit\u2019s issue does not affect the others.<\/li>\n\n\n\n<li>Easier room number configuration.<\/li>\n\n\n\n<li>Scalable for future expansion (additional monitors or outdoor stations).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Alternative: Direct Bus Wiring (Not Recommended for 3 Units)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connect all monitors in series along a shared 2-wire bus.<\/li>\n\n\n\n<li>Simpler cabling, but a fault on the bus can affect multiple apartments.<\/li>\n\n\n\n<li>Room number configuration must be done carefully.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Recommendation:<\/strong> Use a 2-wire switch for star wiring. It provides stable power distribution and simplifies troubleshooting.<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"step-by-step-wiring-guide\" class=\"wp-block-heading\">Step-by-Step Wiring Guide<\/h3>\n\n\n\n<h4 id=\"step-1-mount-the-outdoor-station\" class=\"wp-block-heading\">Step 1: Mount the Outdoor Station<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mount at 1.5\u20131.8 metres above ground, protected from direct rain and sunlight.<\/li>\n\n\n\n<li>Use the included rain cover and mounting bracket.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"step-2-mount-the-indoor-monitors\" class=\"wp-block-heading\">Step 2: Mount the Indoor Monitors<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mount each monitor in a convenient indoor location (hallway, living room, or bedroom).<\/li>\n\n\n\n<li>Recommended height: 1.2\u20131.4 metres.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"step-3-run-the-2-wire-cables\" class=\"wp-block-heading\">Step 3: Run the 2-Wire Cables<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use 2-core cable (\u22650.5mm\u00b2).<\/li>\n\n\n\n<li>Keep cable runs under 100 metres. For longer distances, use thicker gauge (0.75mm\u00b2 or 1.0mm\u00b2).<\/li>\n\n\n\n<li>Avoid running cables parallel to AC power lines to prevent interference.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"step-4-connect-the-outdoor-station\" class=\"wp-block-heading\">Step 4: Connect the Outdoor Station<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connect the 2-wire cable to the outdoor station\u2019s terminals. Polarity does not matter.<\/li>\n\n\n\n<li>If an electric lock is used, connect the lock wires to the relay output (NO and COM).<\/li>\n\n\n\n<li>A separate 12V DC power supply is required for the lock.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"step-5-connect-the-2-wire-switch\" class=\"wp-block-heading\">Step 5: Connect the 2-Wire Switch<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connect the cable from the outdoor station to the switch\u2019s input.<\/li>\n\n\n\n<li>Connect each indoor monitor\u2019s cable to the switch\u2019s output ports.<\/li>\n\n\n\n<li>Power the switch with the supplied adapter.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"step-6-connect-the-indoor-monitors\" class=\"wp-block-heading\">Step 6: Connect the Indoor Monitors<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connect each monitor\u2019s 2-wire cable to the switch output.<\/li>\n\n\n\n<li>Ensure each monitor receives power via the 2-wire connection.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"step-7-power-on-and-test\" class=\"wp-block-heading\">Step 7: Power On and Test<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Power on the system.<\/li>\n\n\n\n<li>Press button 1. Indoor Monitor 1 should ring.<\/li>\n\n\n\n<li>Press button 2. Indoor Monitor 2 should ring.<\/li>\n\n\n\n<li>Press button 3. Indoor Monitor 3 should ring.<\/li>\n\n\n\n<li>Test two-way audio, video, and unlock function.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"configuration-room-numbers-and-button-mapping\" class=\"wp-block-heading\">Configuration: Room Numbers and Button Mapping<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">After wiring, each indoor monitor must be assigned a unique room number, and each button on the outdoor station must be mapped to the correct apartment.<\/p>\n\n\n\n<h4 id=\"step-1-assign-room-numbers-to-indoor-monitors\" class=\"wp-block-heading\">Step 1: Assign Room Numbers to Indoor Monitors<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Via Indoor Monitor Menu:<\/strong><\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Enter the <strong>Settings<\/strong> menu.<\/li>\n\n\n\n<li>Select <strong>Room Number<\/strong> or <strong>Address Setting<\/strong>.<\/li>\n\n\n\n<li>Enter the apartment number (e.g., 101, 102, 103).<\/li>\n\n\n\n<li>Save and exit.<\/li>\n\n\n\n<li>Repeat for each monitor.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Via 2-Wire Switch or Management Software (for larger systems):<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connect the switch to a PC or use its web interface.<\/li>\n\n\n\n<li>Assign room numbers in bulk.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Important:<\/strong> Each monitor must have a unique room number. Duplicate numbers will cause call routing errors.<\/p>\n<\/blockquote>\n\n\n\n<h4 id=\"step-2-map-outdoor-station-buttons-to-apartments\" class=\"wp-block-heading\">Step 2: Map Outdoor Station Buttons to Apartments<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For a 3-button station:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>By default, Button 1 calls Unit 1, Button 2 calls Unit 2, Button 3 calls Unit 3.<\/li>\n\n\n\n<li>If your numbering is different, configure the mapping.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Configuration methods:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Via indoor monitor menu:<\/strong> Some systems allow button mapping from the monitor\u2019s settings.<\/li>\n\n\n\n<li><strong>Via DIP switches or jumpers:<\/strong> Some models use physical switches on the outdoor station to set button addresses.<\/li>\n\n\n\n<li><strong>Via management software:<\/strong> For advanced systems, assign each button to a specific room number.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example mapping:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Button<\/th><th class=\"has-text-align-left\" data-align=\"left\">Unit<\/th><th class=\"has-text-align-left\" data-align=\"left\">Room Number<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>Unit 1<\/td><td>101<\/td><\/tr><tr><td>2<\/td><td>Unit 2<\/td><td>102<\/td><\/tr><tr><td>3<\/td><td>Unit 3<\/td><td>103<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Label each button with the resident\u2019s name or unit number for easy identification.<\/p>\n\n\n\n<h4 id=\"step-3-configure-system-settings\" class=\"wp-block-heading\">Step 3: Configure System Settings<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Unlock duration:<\/strong> Set the relay release time (typically 3\u201310 seconds).<\/li>\n\n\n\n<li><strong>Ringtone volume:<\/strong> Adjust indoor monitor ringtone volume.<\/li>\n\n\n\n<li><strong>Video settings:<\/strong> Adjust brightness, contrast, and night vision if available.<\/li>\n\n\n\n<li><strong>Language:<\/strong> Select the preferred language for the UI.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"step-4-optional-app-configuration-tuya-smart-life\" class=\"wp-block-heading\">Step 4: Optional App Configuration (Tuya \/ Smart Life)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">If the indoor monitor supports Wi-Fi and Tuya Smart Life:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Connect the monitor to a 2.4GHz Wi-Fi network.<\/li>\n\n\n\n<li>Download the Tuya Smart or Smart Life app.<\/li>\n\n\n\n<li>Create an account and tap \u201cAdd Device.\u201d<\/li>\n\n\n\n<li>Follow the pairing instructions.<\/li>\n\n\n\n<li>Assign the device to a room and name it (e.g., \u201cUnit 1\u201d).<\/li>\n\n\n\n<li>Test remote answering, live view, and unlock.<\/li>\n<\/ol>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Note:<\/strong> Not all 2-wire systems support app integration. Check your specific model\u2019s specifications.<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"testing-and-commissioning\" class=\"wp-block-heading\">Testing and Commissioning<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">After configuration, test every function:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Test<\/th><th class=\"has-text-align-left\" data-align=\"left\">What to Verify<\/th><\/tr><\/thead><tbody><tr><td><strong>Button 1 call<\/strong><\/td><td>Rings Indoor Monitor 1 within 1.5 seconds.<\/td><\/tr><tr><td><strong>Button 2 call<\/strong><\/td><td>Rings Indoor Monitor 2 within 1.5 seconds.<\/td><\/tr><tr><td><strong>Button 3 call<\/strong><\/td><td>Rings Indoor Monitor 3 within 1.5 seconds.<\/td><\/tr><tr><td><strong>Two-way audio<\/strong><\/td><td>Clear conversation, no echo, no dropouts.<\/td><\/tr><tr><td><strong>Video quality<\/strong><\/td><td>Clear image, correct viewing angle, night vision activates in low light.<\/td><\/tr><tr><td><strong>Unlock function<\/strong><\/td><td>Door releases reliably; relay click audible.<\/td><\/tr><tr><td><strong>App functions<\/strong><\/td><td>Remote answer, live view, and unlock work over Wi-Fi (if supported).<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">If any test fails, check wiring connections, cable continuity, and power supply voltage before replacing hardware.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"troubleshooting-common-issues\" class=\"wp-block-heading\">Troubleshooting Common Issues<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Issue<\/th><th class=\"has-text-align-left\" data-align=\"left\">Possible Cause<\/th><th class=\"has-text-align-left\" data-align=\"left\">Solution<\/th><\/tr><\/thead><tbody><tr><td><strong>Apartment does not ring<\/strong><\/td><td>Wrong room number<\/td><td>Reconfigure room number on indoor monitor<\/td><\/tr><tr><td><\/td><td>Wiring fault<\/td><td>Check 2-wire connections at switch and monitor<\/td><\/tr><tr><td><strong>Multiple monitors ring at once<\/strong><\/td><td>Duplicate room numbers<\/td><td>Assign unique numbers to each monitor<\/td><\/tr><tr><td><strong>No video<\/strong><\/td><td>Loose cable<\/td><td>Re-seat 2-wire connections<\/td><\/tr><tr><td><strong>No audio<\/strong><\/td><td>Volume muted<\/td><td>Check volume settings<\/td><\/tr><tr><td><strong>Unlock fails<\/strong><\/td><td>Relay wiring<\/td><td>Verify lock power and relay connections<\/td><\/tr><tr><td><strong>App not connecting<\/strong><\/td><td>Wi-Fi on 5GHz<\/td><td>Switch to 2.4GHz network<\/td><\/tr><tr><td><strong>Monitor does not power on<\/strong><\/td><td>Insufficient power<\/td><td>Check 2-wire switch power supply<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"best-practices-for-3-button-systems\" class=\"wp-block-heading\">Best Practices for 3-Button Systems<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Use quality cable<\/strong> \u2013 \u22650.5mm\u00b2 copper for 2-wire runs.<\/li>\n\n\n\n<li><strong>Keep cable runs under 100 metres<\/strong> \u2013 for longer distances, use thicker gauge or a repeater.<\/li>\n\n\n\n<li><strong>Avoid parallel runs with power lines<\/strong> \u2013 prevents interference.<\/li>\n\n\n\n<li><strong>Label both ends of every cable<\/strong> \u2013 simplifies maintenance.<\/li>\n\n\n\n<li><strong>Test each apartment after configuration<\/strong> \u2013 call from the outdoor station and verify all functions.<\/li>\n\n\n\n<li><strong>Secure outdoor connections<\/strong> \u2013 use waterproof gel caps or silicone.<\/li>\n\n\n\n<li><strong>Document room numbers and wiring<\/strong> \u2013 essential for future service.<\/li>\n\n\n\n<li><strong>Update firmware<\/strong> \u2013 check for updates after installation.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"why-choose-farhd-for-your-3-button-system\" class=\"wp-block-heading\">Why Choose FARHD for Your 3-Button System?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">FARHD has been designing and manufacturing video intercom systems since 1998, with over 28 years of industry experience. Our 2-wire systems are trusted in over 100 countries for their reliability, ease of installation, and robust feature set.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key advantages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Source factory<\/strong> \u2013 Factory-direct pricing, full quality control.<\/li>\n\n\n\n<li><strong>2-wire simplicity<\/strong> \u2013 Reuses existing wiring, non-polarity, up to 100m.<\/li>\n\n\n\n<li><strong>3-button outdoor station<\/strong> \u2013 Ideal for small apartment buildings (up to 3 units).<\/li>\n\n\n\n<li><strong>2-wire switch<\/strong> \u2013 Provides stable power and fault isolation.<\/li>\n\n\n\n<li><strong>Weatherproof<\/strong> \u2013 IP65 outdoor stations, -40\u00b0C to +70\u00b0C.<\/li>\n\n\n\n<li><strong>OEM\/ODM\/SKD<\/strong> \u2013 Custom branding, packaging, and software.<\/li>\n\n\n\n<li><strong>No MOQ<\/strong> \u2013 Start with a sample; scale as you grow.<\/li>\n\n\n\n<li><strong>Global certifications<\/strong> \u2013 CE, FCC, RoHS, IP65, EMC.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Our products are installed in thousands of apartments, villas, and residential projects worldwide.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"frequently-asked-questions\" class=\"wp-block-heading\">Frequently Asked Questions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: Can I connect three indoor monitors directly to a 3-button outdoor station without a switch?<\/strong><br>A: It is possible for short distances, but using a 2-wire switch is recommended for better reliability and fault isolation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: How do I assign which button calls which monitor?<\/strong><br>A: Configure room numbers on each indoor monitor and map the outdoor station buttons accordingly. Most systems default to Button 1 = Unit 1, Button 2 = Unit 2, Button 3 = Unit 3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: What happens if two monitors have the same room number?<\/strong><br>A: Both will ring at the same time. Always assign unique room numbers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: Can I add a fourth indoor monitor later?<\/strong><br>A: Yes, if the 2-wire switch has available ports.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: Does the system work without internet?<\/strong><br>A: Yes. Basic calling, video, and unlock functions work without internet. Internet is only required for remote app access.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: What is the maximum cable distance?<\/strong><br>A: Up to 100 metres with \u22650.5mm\u00b2 cable. For longer distances, use thicker gauge or a repeater.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"contact-us-for-catalog-pricing-and-samples\" class=\"wp-block-heading\">Contact Us for Catalog, Pricing, and Samples<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The FARHD 3-button outdoor station with three indoor monitors and a 2-wire switch is the ideal choice for small apartment buildings. With easy 2-wire wiring, simple configuration, and reliable performance, it delivers everything you need for secure, convenient entry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Contact us today for catalog, pricing, or to request a sample.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udce9 <strong>Email:<\/strong> info@farhd.com<br>\ud83c\udf10 <strong>Website:<\/strong> <a href=\"https:\/\/www.farhd.com\/\" target=\"_blank\" rel=\"noopener\">www.farhd.com<\/a><br>\ud83d\udcf1 <strong>WhatsApp:<\/strong> +86 188 2370 9809 \/ +86 199 2545 1918<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><em>FARHD \u2013 Video Intercom Manufacturer Since 1998.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>#3ButtonIntercom #2WireIntercom #ApartmentIntercom #VideoIntercom #2WireSwitch #WiringGuide #Configuration #FARHD #OEM #ODM #BuildingSecurity<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When you manage a small apartment building with three units, you need an intercom system that is simple, reliable, and easy to install. The FARHD 3-button outdoor station paired with three indoor monitors delivers exactly that\u2014using a 2-wire connection through a 2-wire switch. No complex cabling, no network configuration, no Wi-Fi dropouts. Just clear video,&#8230;<\/p>","protected":false},"author":2,"featured_media":8158,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-8157","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"taxonomy_info":{"category":[{"value":1,"label":"Uncategorized"}]},"featured_image_src_large":["https:\/\/farhd.com\/wp-content\/uploads\/2026\/10\/7-3-640x1024.jpg",640,1024,true],"author_info":{"display_name":"Kevin","author_link":"https:\/\/farhd.com\/pt\/author\/kevin\/"},"comment_info":0,"category_info":[{"term_id":1,"name":"Uncategorized","slug":"uncategorized","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"","parent":0,"count":572,"filter":"raw","term_order":"0","cat_ID":1,"category_count":572,"category_description":"","cat_name":"Uncategorized","category_nicename":"uncategorized","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/posts\/8157","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/comments?post=8157"}],"version-history":[{"count":1,"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/posts\/8157\/revisions"}],"predecessor-version":[{"id":8160,"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/posts\/8157\/revisions\/8160"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/media\/8158"}],"wp:attachment":[{"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/media?parent=8157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/categories?post=8157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/farhd.com\/pt\/wp-json\/wp\/v2\/tags?post=8157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}