Multiplexor for interfacing scanner and printer with a function select circuit including three multiplex, tri-state buffers, and buffer circuits and display device for status indication

摘要

The present invention relates to a switch for computer peripheral devices, which is connected between the printer port of personal computer and a printer or a scanner. That is to say the personal computer transmits instruction signals to the switch for computer peripheral devices through the printer port according to the requirement of usage and signal linkage of the peripheral devices such as a printer and a scanner. The switch of the computer peripheral devices order the printer port to connect and communicate with the printer, scanner and other computer peripheral devices for the data input and output transmission, so that when the printer and the scanner are in operation, the computer form a information linkage and transmission structure according to the control of the instruction signal.