S21A Series Hollow-Shaft Rotary Optical Encoders
Description
Allied Motion’s S21 series are cost-effective, hollow shaft modular optical encoders that are easy to mount and offer both incremental and absolute output formats. These compact, standard size 21 (2.1 in diameter) encoders have their own bearing system and are housed in a high-grade glass filled plastic resin shell with an IP40 protection rating. The S21 series' features include up to 10,000 RPM shaft speed, software configurable resolution, and eight format types including sine-cosine, high-count incremental (to 2.1 million CPR), and serial and parallel absolute versions.
S21A Series Hollow-Shaft Rotary Optical Encoders
Specifications |
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| Grating Period: | -- um |
| Resolution (linear): | -- um |
| Linear Accuracy (total): | -- um |
| Max Speed (linear): | -- mm/sec |
Features
Compact mechanical dimensions (2.1” O.D. x 1.2” H) for easier system integration
Robust bearing system
Industrial ball bearings enable up to 10,000 RPM shaft speed
Simplified direct-mount design
Software configurable resolution
Circuit protection: Short circuit, reverse polarity, transient voltage suppression
ASIC-based design for excellent matching and reliability
Fast BiSS C serial data communications via RS-485 differential driver pair
High noise immunity
RoHS compliant
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Frequently Asked Questions
The dimensions of the S21A Series Hollow-Shaft Rotary Optical Encoders are 2.1" O.D. x 1.2" H.
The S21A Series Hollow-Shaft Rotary Optical Encoders can handle up to 10,000 RPM shaft speed.
Yes, the resolution of the S21A Series Hollow-Shaft Rotary Optical Encoders is software configurable.
The S21A Series Hollow-Shaft Rotary Optical Encoders have circuit protection against short circuit, reverse polarity, and transient voltage suppression.
The S21A Series Hollow-Shaft Rotary Optical Encoders support the BiSS C serial data communications via RS-485 differential driver pair.