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The MSD-4C is a code-operated switch that has five RS-232 serial ports consisting of a Master Port and four sub-channel ports. The user will enter an ASCII command from a computer that is transmitted over the Master port. The ascii command allows automatic switching of the Master Port data path to one of the four sub-channel ports. The data path is secure and does not allow the other data ports to access the Master Port until an ascii command is re-issued.