# ZeroErr eCoder11 RS485 Absolute Magnetic Ring Encoder, 11 mm Bore

![ZeroErr eCoder11 RS485 Absolute Magnetic Ring Encoder, 11 mm Bore](https://parts.trymaglev.com/img/ac-zeroerr-ecoder11.webp)

Chinese hollow magnetic ring + readhead absolute encoder (11 mm bore, 30 mm OD) with Tamagawa-compatible RS-485, sized for small robot joints.

- Maglev ID: ac-zeroerr-ecoder11
- Brand: ZeroErr
- MPN: eCoder11
- Category: actuators / Joint Encoders
- Origin: CN (maker HQ, factory not confirmed)
- Maker: ZeroErr (brand, CN)
- NDAA: unknown · Blue UAS: unknown · FCC: n/a
- HTS: 9031.80.80.85 (typical)
- MOQ: unknown · Lead time: unknown
- Confidence: REPORTED

## Price
- 1+: $133 (distributor, 2026-10-30, https://rcdrone.top/products/zeroerr-ecoder11-magnetic-encoders; single-turn RS485 variant)
- 1+: $90 (distributor, 2026-10-30, https://aifitlab.com/products/zeroerr-ecoder11-magnetic-encoders; single-turn RS485 variant; backordered at this seller)

## Specifications
- Resolution: 17-bit or 19-bit (single- or multi-turn; family spec 17-21 bit)
- Interface: RS-485 (protocol stated compatible with Tamagawa)
- Type: Axial-reading magnetic ring + readhead, 11 mm through-hole; battery-backed multi-turn option
- Bore: 11 mm

## Links
- Product: https://rcdrone.top/products/zeroerr-ecoder11-magnetic-encoders
- Datasheet: none
- CAD: none

## Equivalents
- RLS AksIM-2 Off-Axis Absolute Rotary Encoder (ac-rls-aksim-2)
- ZeroErr eCoder20 RS485 Absolute Magnetic Ring Encoder, 20 mm Bore (ac-zeroerr-ecoder20)

## Sources
- https://rcdrone.top/products/zeroerr-ecoder11-magnetic-encoders (variants, price, specs)
- https://aifitlab.com/products/zeroerr-ecoder11-magnetic-encoders (price, ring/readhead dimensions, <0.1° tolerance, ±15" repeatability, stock)