ZeroErr eCoder20 RS485 Absolute Magnetic Ring Encoder, 20 mm Bore
ZeroErr · MPN eCoder20 · Maglev ID ac-zeroerr-ecoder20
CN Maker in China, factory not confirmed unknown REPORTED
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.
Specifications
| Resolution | 19 bit (ZeroErr product page); family 17-21 bit + optional 16-bit multiturn counter (manual) |
|---|---|
| Accuracy | <0.06° maximum absolute tolerance with well-centred ring (manual Table 7-1); self-calibration recommended after install; repeatability ±10" |
| Max speed | 12,000 rpm |
| Interface | RS-485 asynchronous serial, 2.5 Mbps (request/response frames with CRC) |
| Form | off-axis ring kit (axial-reading magnetic ring + readhead) |
| Sensing | unknown |
| Supply | 4.7-5.4 V |
| Bore | 20 mm ring ID (readhead ID 22 mm) |
| Outer diameter | 33.5 mm ring OD; readhead OD 34 mm |
| Multi-turn | yes, optional 16-bit multiturn counter with 3.6 V battery backup (eCoder xx M-RxxB) |
| Operating temp | -40 to +85 °C (product page); manual says -40 to +105 °C |
Who makes it
MakerZeroErr
Based inChina
RoleBrand owner
Need a different shaft, connector, firmware or enclosure, or a price at 1,000 units? Maglev takes the catalog part to the factory and comes back with a custom version and one fixed price.
Landed cost in the US
CN
37.5%
TW
10%
VN
12.5%
IN
10%
JP
12.5%
KR
12.5%
DE
10%
MX
10%
US
0%
Total US duty on this part by where it is made (2026-10-29). Mexico shown before USMCA preference; qualifying goods enter duty free. Your factory choice, not the shipping port, sets the origin.
Loading duty data…
Compliance
| HTS classification | 9031.80.80.85 typical, not a ruling |
|---|---|
| NDAA | unknown |
| Blue UAS | unknown |
| FCC | n/a |
Equivalents from other makers
RLS AksIM-2 Off-Axis Absolute Rotary EncoderRLS · SI · $238.97
ZeroErr eCoder11 RS485 Absolute Magnetic Ring Encoder, 11 mm BoreZeroErr · CN · $90
KingKong MPT Series Robot Joint Magnetic Encoder (Single)KingKong Technology · CN · $280
Netzer DS-58 Hollow-Shaft Absolute Electric EncoderNetzer Precision · IL · Quote
ZeroErr eCoder18 RS485 Absolute Magnetic Ring Encoder, 18 mm BoreZeroErr · CN · $180
ZeroErr eCoder45 RS485 Absolute Magnetic Ring Encoder, 45 mm BoreZeroErr · CN · $250
ZeroErr eCoder35H RS485 Absolute Magnetic Ring Encoder, 35 mm BoreZeroErr · CN · $450Sources
- https://rcdrone.top/products/zeroerr-ecoder20-magnetic-encodersvariants, price, <0.06° tolerance, ±10" repeatability, 12,000 rpm
- https://aifitlab.com/products/zeroerr-ecoder20-magnetic-encodersprice, ring/readhead dimensions, stock
- https://www.zeroerr.com/magnetic_encoders/ecoder20maker page: ID/OD, 19 bit, repeatability, 12000 rpm, RS485, temperature
- https://dl.zeroerr.cn/static/en/ZeroErr_eCoder_Manual_Ver2.6.pdfeCoder manual v2.6: accuracy table, supply 4.7-5.4 V, 17-21 bit, multiturn battery, 2.5 Mbps RS485
Record confidence: REPORTED. VERIFIED means the maker's own documents; REPORTED means a credible third party; UNVERIFIED means a single weak source. Anything we could not confirm says unknown.