{"product_id":"3-rs485a-edwards-est3-network-communications-card-class-ab-with-audio-circuits","title":"3-RS485A | Edwards EST3 Network Communications Card, Class A\/B with Audio Circuits","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-start=\"144\" data-end=\"396\"\u003eThe Edwards 3-RS485A is a network communications card designed for EST3 fire alarm and emergency communication systems. It provides Class A (Style 7) or Class B (Style 4) circuits for network data and dual Class A circuits for digitized audio signals. The 3-RS485A mounts directly to the 3-CPU1 and ensures reliable data and audio transfer between network nodes.\u003c\/p\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable style=\"width: 100%; height: 362.688px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003eEdwards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003eComputer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003e3-RS485A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003eCommunication Card\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003eAttaches directly to 3-CPU1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eNetwork Circuits\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003e1 Class A (Style 7) or Class B (Style 4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eAudio Circuits\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003e2 Class A (Style 7) digitized audio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003eRetransmits network messages to next node\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 39.1875px;\"\u003e\u003cstrong\u003eMaximum Nodes Supported\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 39.1875px;\"\u003e64 per network\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eWiring Media\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003eCopper or fiber (with 3-FIBMB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eFail-Safe Feature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003eDirect-connect data ports on card\/CPU failure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003eEST3 fire alarm and emergency communication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 19.5938px;\"\u003e\u003cstrong\u003eAgency Listings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 19.5938px;\"\u003eUL\/ULC approved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical Use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 39.1875px;\"\u003eNetwork data and audio communications in life safety systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 10px;\"\u003e\n\u003ctd style=\"width: 31.5217%; height: 10px;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.1656%; height: 10px;\"\u003e0.50 lbs (approx.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About \u003cspan data-sheets-root=\"1\"\u003e3-RS485A\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe 3-RS485A is a critical component of the EST3 platform, enabling network communication and audio distribution across large fire alarm networks. It supports re-transmission of messages to extend wiring distances and improve overall system scalability. With up to 64 nodes, the EST3 network can span miles of copper or fiber cabling when used with the 3-FIBMB fiber module. Fail-safe circuitry ensures continuous operation by directly connecting data input and output ports in the event of a CPU or card failure. This design provides resilience and uninterrupted communication in mission-critical life safety applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNetwork Communications Interface: Provides connectivity for EST3 fire alarm network nodes.\u003c\/li\u003e\n\u003cli\u003eClass A\/B Support: Configurable for Class A (Style 7) or Class B (Style 4) communication circuits.\u003c\/li\u003e\n\u003cli\u003eDual Audio Channels: Two additional Class A circuits for digitized audio distribution.\u003c\/li\u003e\n\u003cli\u003eRe-Transmission Functionality: Boosts network length by forwarding messages to the next node.\u003c\/li\u003e\n\u003cli\u003eExtended Network Capacity: Supports up to 64 nodes over copper or fiber media.\u003c\/li\u003e\n\u003cli\u003eFail-Safe Mechanisms: Direct-connect input\/output ports if the CPU or card fails.\u003c\/li\u003e\n\u003cli\u003eFiber Compatibility: Works with the 3-FIBMB module for fiber optic communication.\u003c\/li\u003e\n\u003cli\u003eDirect Mounting: Installs on the back of the 3-CPU1 central processor unit.\u003c\/li\u003e\n\u003cli\u003eRobust Communication: Ensures reliable signal delivery for fire alarm and emergency audio systems.\u003c\/li\u003e\n\u003cli\u003eUL\/ULC Listed: Designed for compliance with life safety system standards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 3-RS485A delivers the reliability and resilience required for network communication in Edwards EST3 fire alarm and emergency systems.\u003c\/p\u003e","brand":"Edwards","offers":[{"title":"Default Title","offer_id":49105180459264,"sku":"3-RS485A","price":630.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/f5a0ecb571f74b49a0acb4934c5b9123.jpg?v=1785541995","url":"https:\/\/alotechparts.com\/products\/3-rs485a-edwards-est3-network-communications-card-class-ab-with-audio-circuits","provider":"Alo Tech Solutions","version":"1.0","type":"link"}