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RSG35 Series 35mm Bearingless Absolute Encoder 17-23 Bit
DetailsUltra-flat bearingless (split-type) multi-turn absolute encoder with battery-backed 16-bit multi-turn counter. Features 17 to 24-bit selectable single-turn resolution, RS485 2.5MHz serial communication, and compact 35mm design with approximately 12.5mm thickness. Ideal for space-constrained servo motor upgrades and modular encoder retrofit applications.
This product is mainly used for servo-driven control system. Provide feedback information and auxiliary signals required by accurate position and speed control units for the system.
| Parameter | Specification |
|---|---|
| Single-Turn Resolution | 131,072 (17-bit) ~ 16,777,216 (24-bit) selectable |
| Multi-Turn Counter | 16-bit (65,536 turns, battery-backed retention) |
| Absolute Positioning Accuracy | Dependent on motor shaft rotational accuracy |
| Repeatability Accuracy | < ±3 arc-seconds (depends on motor & assembly fit) |
| Interface Protocol | RS485 |
| Baud Rate | 2.5 MHz | Communication frequency ≤ 16K| Communication frequency ≤ 16K |
| Allowable Shaft Deviation | Dip Angle: 0.1° / Axial Endplay: <0.1mm / Radial Runout: <0.01mm |
| Max Operating Speed | 6,000 rpm |
| Moment of Inertia | 0.21 kg·mm² |
| Rotor Angular Acceleration | Powered: ≤80,000 rad/s² / Battery: ≤4,000 rad/s² |
| Current Consumption | < 100 mA |
| Battery Voltage | 3.6V DC (Warning: 3.1V / Fault: 2.5V) |
| Supply Voltage | Single 5V DC |
| Operating Temperature | -20 °C to +105 °C |
| Relative Humidity | ≤90% (40°C/21d, EN 60068-2-78, non-condensing) |
| Ingress Protection | IP40 |
| Mechanical Shock | 980 m/s² (100G), 11ms, 3 times per XYZ (18 total) |
| Vibration | 10-55Hz 1.5mm / 55-2000Hz 98 m/s² |
| Rise/Fall Time | Around 100ns |
| Insulation Resistance | 50 MΩ |
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R = Absolute EncoderSU = Bearingless Type U35 = 35mm Outer Diameter17/23/24 = BitsP/M/S = Single/Multi-Turn06 = Hole Diameter (other sizes available)P/M = Tolerance (pos./neg.)T/A/B = Interface/Protocol17 = 17-bit 23 = 23-bit 24 = 24-bitP = Pseudo Multi M = Multi S = SingleT = RS485 A = Nikon B = BiSSØ35mm bearingless absolute encoder. Ø3 shaft (tolerance ±0.05mm) with axial float <0.15mm. 2-∅2.7 mounting holes on Ø31±0.1 PCD. Body length 13.2mm overall. Refer to the mechanical dimension drawings below for complete dimensional specifications and recommended motor-side mounting dimensions with tolerance stack.
RSU3506 Mechanical Dimension Drawing
RSU3506 Recommended Motor-side Dimensions
| Pin | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| Signal | 5V | GND | 485+ | 485- | Battery + | Battery GND | NC | PE |
| Color | Red | Black | Blue | Yellow | Brown | White | — | Shield |
The EPOCH RSU3506 is an ultra-flat bearingless (split-type) multi-turn absolute encoder with 17-24 bit selectable resolution and RS485 2.5MHz communication. Its compact 35mm form factor and approximately 12.5mm thickness make it suitable for space-constrained servo motor upgrades and modular encoder retrofit applications, including Nikon 35mm modular encoder replacements. Engineers should verify shaft bore dimensions, mounting configuration, and protocol requirements before specifying.
EPOCH is an independent encoder manufacturer. Verify all mechanical and electrical parameters before integration.
Q: What is a bearingless (split-type) absolute encoder?
A bearingless encoder has no internal bearing and uses a split-type design where the rotor and stator separate, allowing direct integration onto the motor shaft. This enables an ultra-flat profile (~12.5mm) ideal for space-constrained servo motor applications.
Q: What resolution options does the RSU3506 support?
The RSU3506 supports selectable single-turn resolution from 17-bit (131,072 steps) to 24-bit (16,777,216 steps) with a 16-bit multi-turn counter, selectable via the ordering code.
Q: What interface protocols are supported?
Standard RS485 at 2.5MHz. Nikon interface and BiSS protocol are available as customizable options (*).
Need custom resolution, Nikon/BiSS interface configuration, or bulk pricing? Contact our sales team.
| Item | Description | QTY/Box | Boxes /Carton | G.W | N.W | QTY /Carton | Package Size |
| RSU3506 | RSU3506 bearingless absolute encoder | 10pcs | 10boxes | /kgs | /kgs | 100pcs | 310*130*45mm |
Discover all the technical specifications by downloading the datasheet today.
| Part Number | Interface |
Dimensions
(mm) |
Resolution Ranges | Resolution Counter |
Communication Frequency |
Working Temperature |
Communication Frequency |
Operation Speeds |
Protection Structure |
Footprint 3D | Datasheet | Sample |
| RZ35A08 | RS485 | Φ35mm | 17~23 Bits | Single/Multi-Turn | Differential output | -20°C-+105°C | 16K | 6000rpm | IP40 |  |
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| RZ Series | RS485 | Φ48mm | 17~23 Bits | Single/Multi-Turn | Differential output | -20°C-+105°C | 16K | 6000rpm | IP40 | |
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| UZ Series | RS485 | Φ48mm | 1000-5000CPR | Single/Multi-Turn | Differential output | -20°C-+105°C | 500khz | / | IP40 | |
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| RS972 | / | / | / | / | / | -40°C to +85°C | / | / | / | |
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| RS970 | / | / | / | / | / | -40°C to +85°C | / | / | / | |
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| RK Series | / | / | / | / | / | -20°C to +85°C | / | / | / | |
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| RK Series | / | / | / | / | / | -20°C to +85°C | / | / | / | |
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| RK Series | / | / | / | / | / | -20°C to +85°C | / | / | / | |
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| RF28 | / | / | / | Single/Multi-Turn | / | -40 °C ~+85 °C | / | / | / | |
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| RT28 | / | / | / | Single/Multi-Turn | / | -40 °C ~+85 °C | / | / | / | |
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| RF20 | / | / | / | Single/Multi-Turn | / | -40 °C ~+85 °C | / | / | / | |
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| RR28 | / | / | / | Single/Multi-Turn | / | -40 °C ~+85 °C | / | / | / | |
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| RS5 | / | / | / | Single/Multi-Turn | / | / | / | / | / | |
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| RSG35 | RS485 | / | 17-23 Bits | Single/Multi-Turn | ≤16K | -20 ℃ ~+105 ℃ | 16K | 6000rpm | IP40 | |
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| RSU3506 | RS485 | / | 17-24 Bits | Single/Multi-Turn | ≤16K | -20 ℃ ~+105 ℃ | 16K | 6000rpm | IP40 | |
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| MS Series | / | / | 17 Bits | Single/Multi-Turn | ≤16K | -10℃～105℃ | 16K | ≤6000rpm | / | |
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| RZ1337A | RS485 | / | 25 Bits | Single/Multi-Turn | ≤16K | -20°C-+105°C | 16K | 12000rpm | IP40 | |
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| RZ7810 | RS485 | / | 23~25 Bits | Single/Multi-Turn | ≤16K | -20°C-+105°C | 16K | 6000rpm | IP40 | |
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| RS Series | RS485 | / | 17~23 Bits | Single/Multi-Turn | ≤16K | -20°C-+105°C | 16K | 6000rpm | IP40 | |
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Essential for Precision and Reliability in Medical Equipment
Improve Automation and Efficiency in Various Robotic Applications
Improve the Efficiency and Reliability of Automation Systems
Accurate Feedback on Position and Speed
