In this paper, we present a method for transmitting ternary logic digital signals based on chaos masking, using a new unified chaotic system. The unified chaotic system is in the form of a general Lorenz system, which can generate the dynamics of Lorenz system, Chen system or Lu system, controlled by a simple analog switch. The ternary logic digital information signals can be encoded and then transmitted as a random-like chaotic signal. At the receiver end, this signal is synchronized with one of the subsystems and the ternary logic signals can be duly decoded. The overall communication system has been realized by electronic circuitry, and the design is explained in detail in this paper. Both simulation and experimental results show that the proposed system works well for electronic transmission of ternary logic digital signals.