Abstract: An improved method for serial transmission of binary data. Data words are conveyed over a communications path by means of four discrete signals. Bit value detection circuitry within the transmitter sequentially tests the untransmitted bits. Upon detection of only a single value in all of the untransmitted bits, the value being all ZEROs or all ONEs depending on the embodiment, an end of word signal is transmitted. In the receiver, a register is initialized to the predetermined single value state. Upon receipt of a signal representing the alternate state, the corresponding bit in the register is changed. Receipt of the end of word signal stops the process, at which time the register contains the word which was to be transmitted, thus accelerating the speed at which certain words may be transmitted.