The team SICK visits the RLS headquarters on 22 April 2025 – cooperation on HIPERFACE DSL integration is strengthened and the way is paved for the market launch of the AksIM-4™ with HDSL protocol.
We will soon introduce the AksIM-4™ absolute encoder with HIPERFACE DSL® (HDSL) protocol. This upcoming product will combine the proven capabilities of the AksIM-4™ series with seamless one-cable connectivity for servo motor applications – setting a new benchmark for compact, high-resolution motor feedback systems. AksIM-4™ will be the first open PCB hollow shaft encoder supporting HDSL communication protocol.
Already established as the absolute no. 1 position encoder in robotics, the AksIM-4™ will be further optimized for automation and embedded motion control platforms through the integration of the HDSL protocol – a fast, digital communication protocol based on RS-485.
“Integrating motor feedback shouldn't add complexity. With AksIM-4™ HDSL, engineers will get the performance they expect from our encoders – along with simpler cabling, faster setup, and lower system costs.”
Matej Polak, Product Manager for AksIM encoders at RLS.
The AksIM-4™ HDSL will be developed for space-constrained applications in industrial automation, and servo systems. Its flat PCB readhead combined with axially magnetised rings will enable precise, non-contact absolute position feedback, while minimizing system integration complexity. In addition, the encoder will support advanced features such as real-time temperature and speed monitoring, diagnostics and self-calibration through a robust resource communication structure.
“The AksIM-4™ will be a perfect addition to our portfolio of HIPERFACE DSL supporting products and supporting a multi-sourcing strategy of OEMs. Its open PCB and hollow-shaft design will offer the kind of flexible, high-performance encoder our customers are looking for in integrated and space-sensitive motor solutions.”
Clemens Bitsch, Strategic Product Manager & Business Development Manager for Industrial Sensing at SICK AG.
The integration of the HDSL protocol will enable power and communication to be transmitted over a single shielded twisted pair – reducing cable volume, simplifying installation, and allowing real-time data exchange for predictive maintenance and enhanced machine diagnostics. The protocol will support plug-and-play functionality and data handling, helping machine builders streamline commissioning and improve system reliability.
The AksIM-4™ provides true absolute off-axis measurement in a compact, hollow-shaft format, supports up to 20-bit singleturn and 16-bit multiturn resolutions and withstands harsh operating environments with high resistance to shock, vibration and temperatures ranging from −40 °C to +105 °C. A built-in self-calibration function also helps to simplify system setup and ensure long-term accuracy.
Availability
The samples of AksIM-4™ with HDSL protocol will be available from November 2025.
More information
For detailed specifications, data sheet or to request a sample, please visit:
www.rls.si/AksIM-HDSL and https://hiperfacedsl.com/
About SICK
SICK AG is a global leader in sensor technology and industrial automation. As the developer of the HIPERFACE DSL® protocol, SICK offers a robust, digital one-cable interface that simplifies the integration of motor feedback while enabling advanced diagnostic and safety functions.
About RLS
RLS is a renowned manufacturer of high-performance magnetic encoders and linear encoder systems. With a strong focus on innovation and quality, RLS products are used worldwide in robotics, industrial automation and other demanding motion control applications.