The PathWay® Model 7199 BNC A/B Data Switch with RS485 Remote allows the user the capability of sharing a single BNC interface device connected to the Common port among two other devices connected to the A and B ports for each channel. There are no local or front panel switch controls on the unit. The Model 7199 can ONLY be switched remotely from the DB9 RS485 serial interface remote port located on the rear of the unit.