Data transmission error detection in an electronic cash register system

摘要

A data error-checking system including a transmitting cash register and a receiving cash register, connected to each other in series in a loop formation. Its operation includes the serial transfer of data from the transmitting cash register to the receiving cash register simultaneous with data transfer from the receiving cash register to the transmitting cash register, and comparison of the data transferred from the transmitting cash register with the corresponding data transferred back from the receiving cash register to the transmitting cash register.