... video+1CH negative data1,as project demand,the device is optimized interface,and is convenient for installment with mini volume;2,Transmit 4 ... control signal optionally through selector switch;3,RS 485 control interface can be driven by special chip with 15Kv anti- ... high speed without any delay and disturbances;5,adjustable knob is installed in receiver,which can fine adjustment transmssion distance, ...