What this reader is and where it fits
The Siemens 6GT2821-4AC10 is a SIMATIC RF200 RF240R RFID reader with an integrated antenna, operating at 13.56 MHz and communicating via an RS422 interface using the 3964R protocol. It reads and writes ISO 15693 and ISO 18000-3 transponders (MDS Dxxx family), with a read/write access time of 0.6 ms per byte and a maximum transfer rate of 26.5 kbit/s. The IP67-rated housing (50 x 50 x 30 mm, anthracite PA6.6) withstands washdown environments, making it suitable for production lines where coolant, dust, or hose-down cleaning is routine.
Key ratings and what they mean for fit
The 13.56 MHz HF band gives this reader a typical read range of up to 65 mm, though range depends on the specific transponder type — check Siemens support entry 67384964 for pairing. The RS422 interface supports cable runs up to 1000 m, which matters when the reader sits far from the controller on a long conveyor line. Power draw is 0.05 A typical at 24 V DC (20.4 to 28.8 V range), so it loads the 24 V bus lightly; multiple readers can share one supply without derating. The 3-color LED gives local status without needing to open a panel. MTBF is listed at 430 a, which for a fixed industrial reader means the expected service life comfortably exceeds typical production line refresh cycles.
Mounting and environmental limits
Mounts via two M5 screws through the 50 x 50 mm face; no DIN-rail clip, so plan for direct bracket or machine-frame attachment. Operating temperature range is -20 to +70 °C, with storage and transport from -25 to +80 °C. Shock resistance per EN 60721-3-7 Class 7M2 (500 m/s²) and vibration resistance at 200 m/s² — rated for direct mounting on vibrating equipment like packaging machines or transfer stations. The M12 8-pin connector handles the RS422 and power in one cable; specify a shielded M12 cordset for runs over a few meters.