Abstract: Robot is a set of mechanical devices that could do physical tasks like human and mostly applied as research. One of them with capability of motion like human beings is the sumo robot. Sumo robot is the type robot vehicles taking analogy competition martial arts sumo from Japan. There are two categories of sumo robot that are the autonomous and RC (Remote Control) and categories the heavy robots there are three categories that are 1, 3 and 5 kg. The pilot should have expertise in control remote control. This study discussed sumo robot category with heavy 3 kg and custom communication system. It’s takes a communication system of sumo qualitative robot by remote control. Qualitative system is making of protocol data that has specific function and has a frequency equal to data transmission handshaking model. Qualitative system can use the model TCP/IP OSI because is one to one that data transmission will not have mixed up or called handshaking model. A kind of remote control used that is a play station 2 joystick and module of communication that is used namely APC220 module and regulated by way of the frequency of 433 MHz. In addition, it can display the capacity of voltage sumo robot with an indicator LED who has 10 bars, buzzer and uses voltage sensor and current sensor ACS712.