The Siemens SIMATIC RF210R (6GT2821-1AC10) is the most compact cylindrical HF RFID reader in the SIMATIC RF200 series, with an M18 x 83 mm form factor and an RS422 interface using the 3964R transmission protocol. Its nickel-plated brass housing is designed for flush mounting in tightly constrained spaces — machine fixtures, tool holders, compact assembly stations — where both mechanical space and long cable distances are constraints. The integrated antenna provides up to 20 mm read range, and the RS422 interface supports cable runs up to 1000 m to Siemens RFID communication modules for distributed identification across large facilities.

How Does the RS422 Interface Work on the RF210R?

The RS422 differential interface transmits data at up to 115.2 kbit/s using the 3964R protocol with built-in acknowledgment and retry mechanisms. The reader connects via an 8-pin M12 screw connector and receives 24 V DC power (20.4-28.8 V) at 50 mA typical current draw. Maximum cable length is 1000 m between the reader and the RFID communication module (ASM 456, ASM 475, RF160C, RF170C, RF180C, or RF182C). The communication module then handles upstream PROFIBUS or PROFINET connectivity to the PLC. Up to two readers can share a single ASM 456 or ASM 475 module.

What Are the Installation Characteristics?

The RF210R features an M18 x 83 mm cylindrical housing made of nickel-plated brass with PBT end caps (silver and pastel turquoise), weighing just 65 g. It is secured using two M18 x 1 nuts (included) at up to 20 N·m tightening torque, and can be flush-mounted on metal surfaces with zero minimum clearance. The small M18 bore requirement makes it suitable for retrofitting into existing machine components with limited available mounting real estate. A 3-color LED provides local status indication.

What RFID Standards and Environmental Ratings Apply?

The RF210R operates at 13.56 MHz using ISO 15693 and ISO 18000-3 standards, compatible with the full Siemens SIMATIC RF200 transponder range (MDS D100 through D528). Maximum RF data transfer rate is 26.5 kbit/s. IP67 protection ensures dust-tight operation and resistance to temporary water immersion. Operating temperature range is -20 °C to +70 °C (storage/transport -25 °C to +80 °C). Shock resistance is 500 m/s² and vibration resistance is 200 m/s². MTBF is 505 years. Certifications: CE, FCC, cULus, R&TTE, EAC, KC, CCC.

Frequently Asked Questions

How does the RS422 variant differ from the IO-Link variant of the RF210R?

The RS422 variant (6GT2821-1AC10) connects to an RFID communication module via up to 1000 m of RS422 cable; the module provides upstream PROFIBUS/PROFINET. The IO-Link variant (6GT2821-1BC32) connects directly to an IO-Link master via up to 20 m of cable. Choose RS422 for long-distance distributed installations with existing communication modules; choose IO-Link for shorter-reach direct integration.

Is the RF210R suitable for tool identification in CNC machines?

Yes. The M18 cylindrical form factor with IP67 rating and flush-mount capability makes the RF210R well-suited for embedding in CNC machine tool holders and fixtures. The 20 mm read range is sufficient for reading tags on tool holders passing within close proximity of the reader. The RS422 interface enables cable runs back to a control cabinet up to 1000 m away in large machining halls.