39-bit Multi-turn Absolute Encoder with RS-485 Half-duplex Output

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The AS38-H39E-Kxxx is a multi-turn absolute encoder series with 39-bit resolution (23-bit single-turn and 16-bit multi-turn). The AS38-H39E-Kxxx is a housed encoder consisting of a patterned disk, a light source, and photosensitive elements that translate mechanical motion to electrical signal. The -Kxxx series come with preloaded proprietary, RS-485 compliant protocol supported by a half-duplex line transmission drive (RS-485), offering good noise immunity to enable a robust data transmission up to 2.5 Mb/s in harsh industrial environments.
The key advantage of the AS38-H39E-Kxxx is that the multi-turn tracking circuitry does not need a battery as its power is generated by the Wiegand-based energy harvesting technology. Also, the gearless multi-turn counting does not have gear wear-out or acoustics noise issue typically encountered in conventional gear based multi-turn encoders. Comparing to other multi-turn encoders with batter backup, the AS38-H39E-Kxxx does not have down time associated with periodic maintenance of the battery backup components. Intended for industrial applications, the product incorporates an ESD protection circuitry meeting Class 3 ESD immunity per IEC -61000-4-2 standard and is also compliant with IP50 per IEC 60529 standard.


  • 39-bit resolution: 16-bit energy harvesting multi-turn & 23-bits optical single-turn
  • Alarm features with CRC and alarm status bits 
  • Built in RS-485 half-duplex communication protocol
  • Overall encoder outer diameter of Ø38 mm and maximum height of 40 mm
  • Supports 8mm diameter of blind hollow shaft
  • 5K bits of user accessible memory in E2PROM


  • Robotics
  • Factory Automation
  • Linear Positioning System
  • CNC Machine Tool
  • Medical and Lab Equipment
  • Wind Turbine

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory No
Samples Available No
RoHS6 Compliant Y
Line Driver N
Max Qty of Samples 1
Motion Type Rotary
Optical Method Transmissive
Output Code Binary
Output Type Digital
Shaft Diameter 8
Resolution 39 Bits

Data Sheet1 i