The Siemens 6GT2821-5AC40 is a SIMATIC RF200 RF250R RFID reader operating at 13.56 MHz with an RS232 interface. It reads and writes ISO 15693 and ISO 18000-3 transponders (MDS Dxxx types) and connects to PCs and control systems via ASCII or scan mode. The housing is IP65-rated, anthracite PA6.6, sized 50 x 50 x 30 mm, and mounts with two M5 screws. It draws 0.05 A typical at 24 VDC (20.4 to 28.8 V range) and communicates with one external antenna via an M8 4-pin connector. The communications interface to the controller is an M12 8-pin connector. Maximum read/write access per byte is 1.2 ms typical, and the radio transfer rate tops out at 26.5 kbit/s. Maximum read range is 60 mm, though this depends on the transponder type. The RS232 interface supports cable runs up to 30 m. A 3-color LED gives local status indication. The unit is not multitag-capable and is silicon-free.
Sourcing & Lifecycle
MTBF is listed at 430 years, reflecting solid reliability for a fixed-mount RFID reader in industrial use. The operating temperature range is -20 to +70 °C, with storage and transport from -25 to +80 °C.
Integration Notes
The IP65 rating means this reader can be mounted directly on a machine frame or conveyor line in washdown areas — no separate enclosure needed. The 50 x 50 x 30 mm footprint and M5 screw mounting make it a straightforward retrofit into existing RFID reader positions. Shock resistance per EN 60721-3-7 Class 7 M2 with 500 m/s² shock acceleration and 200 m/s² vibrational acceleration means it holds up on press lines, palletizers, and other high-vibration machinery.