{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6GT2821-4AC11","brand":"Siemens","brandSlug":"siemens","productSlug":"6GT2821-4AC11","canonicalUrl":"https://aoctrl.com/siemens/6GT2821-4AC11","factsUrl":"https://aoctrl.com/api/mcp/products/6GT2821-4AC11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC RF200 RF240R RFID reader, 6GT2821-4AC11, RS-232 interface (3964R), IP67, 13.56 MHz, 65 mm range, 50 x 50 x 30 mm, with integrated antenna.","salesMarkdown":"The Siemens 6GT2821-4AC11 is a SIMATIC RF200 RF240R RFID reader with an integrated antenna, communicating via RS-232 using the 3964R protocol. It operates at 13.56 MHz and reads ISO 15693 and ISO 18000-3 transponders (MDS Dxxx types), with a maximum range of 65 mm — though that range depends on the specific transponder in use. IP67 means the reader body is dust-tight and survives submersion in 1 m of water for 30 minutes — suitable for washdown zones on a production line, but not for continuous immersion or pressurized spray. The housing is PA6.6 in anthracite, fastened with two M5 screws, so it mounts directly to machine frames or brackets without a DIN rail. The 24 V DC supply (20.4 to 28.8 V range) draws 0.05 A typical — low enough to power from a standard 24 V sensor supply without worrying about the line drop over a 30 m RS-232 cable run. The RS-232 interface supports cable lengths up to 30 m, which is the practical limit for that protocol before signal degradation sets in. Read and write access times are both 0.6 ms per byte typical. For a 16-byte UID read that's under 10 ms, but if you're writing larger data blocks (say 128 bytes of user memory) expect roughly 77 ms per block — factor that into your cycle time budget. The reader is not multitag-capable, so it reads one transponder at a time. The 13.56 MHz HF band gives it better performance around metal and liquids than UHF, but the range is still limited to 65 mm max — this is a close-proximity station, not a conveyor portal reader. ## Deployment context This reader is designed for stationary read points on assembly lines, tool identification in machining centers, or access control at workstations where you need to identify a part or tool carrier within a 65 mm window. The RS-232 with 3964R protocol means it connects directly to a PC serial port or a serial-to-USB converter — no fieldbus gateway required, but you're limited to point-to-point topology. The 50 x 50 x 30 mm footprint and M5 mounting make it easy to retrofit into existing fixtures. The M12 8-pin connector carries both power and RS-232 signals, so keep the cable assembly short to maintain signal integrity — 30 m is the maximum, but for reliable communication in a noisy plant I'd keep it under 15 m and use shielded cable with the shield grounded at one end. The silicon-free construction matters if this goes into a paint shop or coating line where silicone contamination causes adhesion failures.","metaTitle":"Siemens 6GT2821-4AC11 RF240R RFID Reader, RS-232, IP67, 13.5","metaDescription":"SIMATIC RF200 RF240R RFID reader with RS-232 interface (3964R protocol), IP67, 13.56 MHz, 65 mm range, 50x50x30 mm. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["RFID & Auto-ID"],"specifications":{"MTBF":"430 y","Color":"anthracite","Depth":"50 mm","IECEx":"No","Width":"50 mm","at DC":"20.4 ... 28.8 V","Height":"30 mm","Material":"PA6.6","During Storage":"-25 ... +80 °C","Display Version":"3-color LED","Range / Maximum":"65 mm; Range is dependent on transponder type: observe http://support.automation.siemens.com/WW/view/en/67384964","lifecycle_stage":"mature","During Operation":"-20 ... +70 °C","During Transport":"-25 ... +80 °C","Fastening Method":"2 x M5 screws","Shock Resistance":"EN 60721-3-7 Class 7 M2","at 24 V / typical":"0.05 A","Shock Acceleration":"500 m/s²","at DC / rated value":"24 V","protection class IP":"IP67","Vibrational Acceleration":"200 m/s²","Suitability For Operation":"ISO 15693 Transponder (MDS Dxxx), for connecting to PC systems (3964R protocol)","Type Of Electrical Connection":"M12, 8-pin","Product Feature / Silicon-Free":"Yes","with RS 232 interface / maximum":"30 m","Operating Frequency / Rated Value":"13.56 MHz","Product Feature / Multitag-Capable":"No","Protocol / With Radio Transmission":"ISO 15693, ISO 18000-3","For Read Access / Per Byte / Typical":"0.6 ms","For Write Access / Per Byte / Typical":"0.6 ms","Standard For Interfaces / For Communication":"RS232","Transfer Rate / With Radio Transmission / Maximum":"26.5 kbit/s"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$204.47","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/936b98dcd6307285a68a1abc56024efd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=523176&mlfb=6GT2821-4AC11","alternativesUrl":"https://aoctrl.com/api/mcp/products/6GT2821-4AC11/alternatives.json"},"ai":{"faq":[{"question":"What is the MTBF for this reader?","answer":"The listed MTBF is 430 years. This is a calculated reliability figure under controlled conditions — in a real plant with vibration, temperature cycling, and electrical noise, field life will be lower, but it indicates a robust design."},{"question":"What compliance documentation is available?","answer":"The reader carries CE marking as a Siemens SIMATIC product. It's silicon-free and built to EN 60721-3-7 Class 7M2 for shock and vibration resistance. Specific RoHS/REACH declarations are available from Siemens upon request."},{"question":"Will this reader work with existing Siemens RFID tags?","answer":"Yes, it's designed for ISO 15693 transponders, specifically the MDS Dxxx series from Siemens. It also supports ISO 18000-3 tags. The maximum read range of 65 mm depends on the transponder type — larger tags give longer range."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6GT2821-4AC11","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/6GT2821-4AC11 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}