RS303MR and RS304MD are controlled by both Serial(TTL) Communication and PWM-Pulse for R/C servos.

RS304MD Specs

Max Torque : 5.0 [kgf·cm]

Max Speed : 0.16 [sec/60deg]

Weight : 21 [g]

Voltage : 7.4 [V]

Movable Range : 300 [deg]

Communication : TTL or PWM

RS303MR Specs

Max Torque : 6.5 [kgf·cm]

Max Speed : 0.11 [sec/60deg]

Weight : 28 [g]

Voltage : 7.4 [V]

Movable Range : 300 [deg]

Communication : TTL or PWM

The following parts are included in RS303MR and RS304MD. 

● 1) Servo(RS303MR or RS304MD) x1 

 2) Servo Horn x1 

 3) Screw to fix servo horn x1 (RS303MR：M2x6) 

 (RS304MD：M2x8 Tapping Screw)

*Servo Horn and Screw are attached to the servo. 

● 4) Free Horn for RS30x x1 

● 5) USAGE PRECAUTION x1

RS303MR/RS304MD is especially designed for robotic applications, having the following features. signed for robotic applications, having the following features. 

● Small and Lightweight 

RS303MR/RS304MD is small and lightweight servos specially designed for robots, which are 21g and 

28g respectively. 

● Interactive High-Speed TTL Communication 

TTL bi-directional communication of a maximum baud rate of 230kbps is possible and is 

used for the communication between the robot’s processor and servos. 

● Servos for Both Command Type and PWM Type 

RS303MR/RS304MD can be controlled either as the Command Type Servo for robots or the PWM Type 

Servo for existing R/C servos. The type is automatically switched by the first signal sent after these 

products are connected. 

● Feedback(Only as Command Type) 

Information of sensors on the servo such as the position, load, temperature, electric current, and the 

alarm situation, etc. can be obtained via TTL communication. 

● Compliance Control 

With this feature, the movement of the RS303MR/RS304MD is controlled in accordance with the 

distance between the present and target positions. This enables the robot to move very smoothly without 

trembling its arms and legs and to absorb turbulence from external force. 

● Calibration 

Angular position of every servo is calibrated by our standard gauge before their shipment. Even if 

another RS303MR/RS304MD servo is employed, it does not require any bothersome work for adjusting 

its angular position. 

● Wiring from the Output Shaft 

In order to avoid wires becoming entangled during operation, they are drawn out from the rear of the 

output shaft. Another shaft is installed on the bottom case to make the center impeller structure easy to 

construct. 

● Horn with a mark for reference position 

凹 marks are placed on the circumference of the servo horn in order to make sure the reference position 

even after being built in. (one 凹 for 0°position, two 凹 s for 90°position, three 凹 s for 180 position 

and four 凹 s for 270°position).