Description: BISYNC, or Binary Synchronous Communication, is a character-oriented protocol designed for synchronous data transmission. This protocol enables efficient communication between devices, using a data format that facilitates synchronization between the sender and receiver. BISYNC is based on the transmission of data blocks that are preceded by control characters, ensuring that both ends of the communication are temporally aligned. This approach is particularly useful in environments where speed and accuracy are crucial, such as in real-time data processing systems. The main features of BISYNC include its ability to handle transmission errors through the use of check codes, as well as its flexibility to adapt to various types of hardware and software. Over the years, BISYNC has been fundamental in the evolution of communication protocols, laying the groundwork for later developments in data transmission. Its relevance remains in applications where robust and reliable communication is required, standing out in the interconnection of systems and in data transmission over computer networks.