The FSV10D1 transmitter allows the user to choose bidirectional data or up-the-coax through use of a dip switch on the compatible FRV10D1 receiver unit. The selection of RS-422 data communication allows PTZ control of the Spectra IV dome. With Coaxitron control, PTZ control signals are transmitted over video coaxial cable from the controller to the FRV10D1 receiver. The receiver then transmits the Coaxitron data onto the fiber to the FSV10D1 transmitter. The Coaxitron data is transmitted from the controller to the Spectra IV dome during the vertical blanking interval of the video signal. The FSV10D1 transmitter includes a corresponding 13-inch fiber cable for easier pre-wiring installation. The unit operates using power supplied from the Spectra IV dome.