# ZeroErr eCoder20 RS485 Absolute Magnetic Ring Encoder, 20 mm Bore

![ZeroErr eCoder20 RS485 Absolute Magnetic Ring Encoder, 20 mm Bore](https://parts.trymaglev.com/img/ac-zeroerr-ecoder20.webp)

ZeroErr's 20 mm through-hole magnetic ring encoder with RS-485, single- or multi-turn, for mid-size joints that route cables through the axis.

- Maglev ID: ac-zeroerr-ecoder20
- Brand: ZeroErr
- MPN: eCoder20
- 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+: $259 (distributor, 2026-10-30, https://rcdrone.top/products/zeroerr-ecoder20-magnetic-encoders; single-turn RS485 variant)
- 1+: $180 (distributor, 2026-10-30, https://aifitlab.com/products/zeroerr-ecoder20-magnetic-encoders; single-turn RS485 variant; backordered at this seller)

## Specifications
- Resolution: 17-bit or 19-bit (family spec 17-21 bit + 16-bit multiturn counter)
- Interface: RS-485 (protocol stated compatible with Tamagawa)
- Type: Axial-reading magnetic ring + readhead, 20 mm through-hole; battery-backed multi-turn option
- Bore: 20 mm

## Links
- Product: https://rcdrone.top/products/zeroerr-ecoder20-magnetic-encoders
- Datasheet: none
- CAD: none

## Equivalents
- RLS AksIM-2 Off-Axis Absolute Rotary Encoder (ac-rls-aksim-2)
- ZeroErr eCoder11 RS485 Absolute Magnetic Ring Encoder, 11 mm Bore (ac-zeroerr-ecoder11)
- KingKong MPT Series Robot Joint Magnetic Encoder (Single) (ac-kingkong-mpt)
- Netzer DS-58 Hollow-Shaft Absolute Electric Encoder (ac-netzer-ds-58)

## Sources
- https://rcdrone.top/products/zeroerr-ecoder20-magnetic-encoders (variants, price, <0.06° tolerance, ±10" repeatability, 12,000 rpm)
- https://aifitlab.com/products/zeroerr-ecoder20-magnetic-encoders (price, ring/readhead dimensions, stock)