The SMC series channel switcher (Be called SMC)is one product that can solve mutual transform of multi-serial communication mode and multi-switch mode, and switch among the double-channel, according to the practical application need in signal acquisition field of current electric power, telecommunication and other communication network systems. SMC uses the one-chip computer control, has multi-device's double-channel switch mode, as well as serial transformation between the input channel and the output channel. It has quick switch speed, light disturbing, high transmission efficiency, adjustable time delaying, faultless data transmission, and provides completely "transparent" full duplex channel for the user.