# RLS OnAxis RTB20 High-Resolution TMR Encoder Board (20 mm)

![RLS OnAxis RTB20 High-Resolution TMR Encoder Board (20 mm)](https://parts.trymaglev.com/img/ac-rls-rtb20.webp)

Ø20 mm TMR on-axis encoder board with up to 18-bit incremental output and UVW commutation; a motor-side encoder for compact BLDC joint motors.

- Maglev ID: ac-rls-rtb20
- Brand: RLS
- MPN: RTB20 (configured)
- Category: actuators / Magnetic Encoders
- Origin: SI (maker HQ, factory not confirmed)
- Maker: RLS merilna tehnika d.o.o. (Renishaw associate) (brand, SI)
- NDAA: unknown · Blue UAS: unknown · FCC: n/a
- HTS: 9031.80.80.85 (typical)
- MOQ: unknown · Lead time: unknown
- Confidence: VERIFIED

## Price
- No public price. Request a quote via POST /api/rfq or the order pad.

## Specifications
- Resolution: incremental up to 18 bit, decimal to 260k CPR (incremental, not absolute)
- Accuracy: typ. ±0.5°; no hysteresis
- Max speed: 30,000 rpm (lower at highest resolutions)
- Interface: Incremental ABZ RS422; UVW commutation (up to 256 pole pairs)
- Form: on-axis module: Ø20 mm encoder board + magnet
- Sensing: TMR
- Supply: 5 V ±5 %
- Bore / ring ID: n/a
- Outer diameter: Ø20 mm
- Operating temp: -40 °C to +105 °C (connector-limited)

## Links
- Product: https://www.rls.si/eng/rtb20-high-resolution-magnetic-encoder
- Datasheet: https://cdn.rls.si/media/documents/RTB20D01.pdf
- CAD: none

## Equivalents
- RLS RMB20 Rotary Magnetic Encoder Module (20 mm PCB) (ac-rls-rmb20)
- RLS RMC22 Commutation + Incremental Magnetic Motor Encoder (22 mm) (ac-rls-rmc22)

## Sources
- https://www.rls.si/eng/rtb20-high-resolution-magnetic-encoder (specs, image)
- https://cdn.rls.si/media/documents/RTB20D01.pdf (datasheet: accuracy, hysteresis, resolution)