{"product_id":"cx5120-n031-0003-beckhoff-embedded-pc-intel-atom-e3815-rs485","title":"CX5120-N031-0003 | BECKHOFF | PC embarqué Intel Atom E3815 RS485","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCX5120-N031-0003 (CX5120-N031-0003)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a fanless, compact Embedded PC designed for high-reliability industrial automation and serial communication tasks. Powered by the Intel Atom E3815 single-core processor (1.46 GHz), this controller offers a deterministic environment for PLC, Motion Control, and gateway applications. This specific model is factory-equipped with an integrated RS485 interface via a 9-pin D-sub socket, configured specifically as a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003edrop point\u003c\/strong\u003e. It is widely utilized in large-scale building automation, smart grid monitoring, and complex factory networks where multiple devices must communicate over a shared serial bus without interfering with network impedance. Its magnesium die-cast housing provides excellent thermal dissipation and EMI protection, enabling stable operation in temperatures ranging from -25 to +60 Celsius.\u003c\/p\u003e\n\u003ch3\u003eTechnical Configuration\u003c\/h3\u003e\n\u003cp\u003eThe hardware architecture of the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCX5120-N031-0003\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis optimized for intermediate placement within a serial communication chain. The \"N031\" designation identifies the integrated RS485 port, which is hardware-configured as a drop point with internal\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003etermination off\u003c\/strong\u003e. This allows the unit to be bridged into an existing RS485 segment without the risk of signal reflection caused by multiple termination resistors. The interface also includes \"echo\" functionality, allowing the processor to monitor its own transmissions for bus contention detection. The device supports dual-bus technology, automatically identifying and controlling both EtherCAT (E-bus) and standard Bus Terminals (K-bus), ensuring maximum flexibility when interfacing with diverse I\/O modules.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCX5120-N031-0003\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBECKHOFF\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eGermany\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProcessor\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIntel Atom E3815 (Single-Core, 1.46 GHz)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRS485 (9-pin D-sub socket)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRS485 Config\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDrop point, with echo, termination OFF\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eI\/O Connection\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eEtherCAT (E-bus) or Bus Terminals (K-bus)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eHousing Material\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMagnesium die-cast\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-25 to +60 Celsius\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCooling\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eFanless \/ Passive\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eapprox. 0.9 kg (Unit only)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2.0 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhen should I choose the CX5120-N031-0003 over the termination-on model?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYou should choose this model (N031-0003) if the Embedded PC will be located in the middle of an RS485 network. Since termination is OFF, it acts as a \"drop point\" and will not disrupt the signal impedance of the bus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the single-core Intel Atom support TwinCAT 3?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, the Intel Atom E3815 is fully compatible with TwinCAT 3. It is ideally suited for standard PLC logic, communication gateway tasks, and small-to-medium I\/O configurations that do not require heavy multi-core processing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the RS485 port isolated?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, Beckhoff N031 interfaces typically provide electrical isolation from the internal PC electronics to protect the CPU from field-side transients and common-mode voltage differences on the serial line.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNetwork Topology Placement:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAs this unit is configured as a drop point (Termination OFF), it must\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003enot\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebe used as the first or last node in an RS485 segment unless you add an external 120 Ohm resistor. It is designed to be wired in a \"daisy-chain\" or \"stub\" configuration where other devices provide the line termination.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEcho Signal Handling:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWith the echo function enabled, the software driver receives everything the unit transmits. Ensure your communication protocol (such as Modbus RTU) is configured to either ignore these echoes or use them for transmission verification to prevent \"data collisions\" in your PLC code.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHeat Management:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTo ensure passive cooling performance, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCX5120-N031-0003\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emust be mounted vertically on the DIN rail. Avoid placing high-heat modules (such as power terminals or frequency inverters) directly below the PC's intake area.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWiring Precision:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUse shielded twisted-pair (STP) cables for the RS485 connection. Connect the signal ground to Pin 5 of the D-sub connector to minimize the impact of ground potential shifts between different nodes on the network\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106675745131,"sku":"CX5120-N031-0003","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/cx5120-n031-0003-jgee0hprk4q.png?v=1776244273","url":"https:\/\/www.plcprotech.com\/fr\/products\/cx5120-n031-0003-beckhoff-embedded-pc-intel-atom-e3815-rs485","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}