UART Bus Servo 35KG Series

1. Features

• Integrated design: brushed motor, reducer, 12‑bit magnetic absolute encoder, and controller
• UART/TTL half‑duplex protocol up to 1 Mbps
• Resolution 4096 counts/360° (0.088°); min control step 0.1°
• Control range: ±180° (single‑turn) or ±368,640° / ±1024 turns (multi‑turn)
• Power‑off position retention
• Trapezoidal accel/decel trajectory for smooth motion
• Auto power threshold detection with adaptive reduction
• Three stop modes: Free / Lock / Damping
• Five protections: temperature / voltage / stall / power / current
• PC configuration tool; firmware upgradable

2. Model definition

Appearance	R：Dual-shaft	H：Single-shaft
Motor type	X：Brushless	P：Coreless	A/L：Cored
Dimension	6：31.5×21×27.6mm	8：40×40×20mm	18：63×34×47mm
Protocols	U：UART/TTL	R：RS-485 P：PWM	C：CAN A：PWM(programmable)
Voltage	[-]：7.4V	H：12V	W：24V
Position Sensor	[-]：Potentiometer	M:12-bit magnetic absolute encoder

Models available for order - RA8-U35(H)-M|HA8-U35(H)-M

3. Specifications

3.1 Basic Specifications

Item	Specification
Input Voltage	6.0-8.4V | 9.0–12.6 V
Motor Type	Iron motor
Position Sensor	12‑bit magnetic absolute encoder
Effective Position Range	±180° (single‑turn); ±368,640° (multi‑turn)
Resolution	2048/360° (0.176°)
Reduction Ratio	378:1
Output Spline	Copper/ Ø6mm / 25T
Gear Material	All-metal copper-aluminum composite gear material
Case Material	Aluminum alloy middle frame with upper/lower engineering plastic housings

3.2 Characteristics

Item	Specifications（7.4V|12V）
Max Stall Torque	3.43 N·m (35 kg·cm)
Max Continuous Torque	1.27 N·m (13 kg·cm)
Rated Torque	0.54 N·m (5.5 kg·cm)
No‑load Speed	34 rpm (0.298 sec@60°)
Peak Current	3 A

3.3 Performance Graph

3.4 Overload Graph

4. Drawings and Installation Instructions

4.1 CAD Dimensional Drawing

4.2 Interface Definition

4.3 Wiring Diagram

• Series Connection

• Parallel Connection

4.4 Installation Instruction

• Single-shaft

• Dual-shaft

5. Development & Compatibility

6. Protections

Warning

Modification towards any protection parameters may cause damage to the production.

7. Control & Modes

7.2 Communication Format

• Transmit Packet Format

• Response Packet Format

7.6 Single-Turn Position Control

7.7 Multi-Turn Position Control

• Multi-turn Position Reset

• Power-off Position Retention

8. Configuration Parameters

Number	Parameter Name	Write	Unit	Default
34	Servo ID	●	-	1
41	Protection Temp	●	ADC	70°C

8.1 Read Data