ScanSys RS004 PTZ Data Distributor, 1x RS232 In, 2xRS485 In , 4x RS485 Out ,DC12.5V, 500mA Power Supply Input option: 1 x RS232, 2 x RS485 (3 input can be stand by status at the same time, but only one controller will be activated at once) Output: 4xRS485, each channel connection range up to 1200 meters by twisted pair cable. Built in surge protection at each channel. Each input/output is isolated. Ability to cascade connection to other units RS004/RS008/RS016. The application gives serial data back on 4 outputs at the same time, to provide perfect configurations. Power supply included.