SERIAL DATA TRANSFER INTERFACE DEVICE AND SERIAL DATA TRANSFER CABLE

摘要

PROBLEM TO BE SOLVED: To realize data transfer regardless of whether equipment at the other party is master equipment or slave equipment. SOLUTION: A connecting state detecting circuit 31 manually or automatically sets whether or not equipment at its own side is master equipment or slave equipment. A switch SW2 or SW3 switches pull-down or pull-up corresponding to the data line of a serial data transfer cable which is different from each other with respect to the master equipment or the slave equipment according to the setting.