SPECIFICATIONS: For use in controlling PTZ Cameras. Package Label: High Tech. RS-232 to RS-485/422 Interface converter. List of components used in RS232 to RS 485 converter. C1, C2 ,C3, C4 = 2.2UF ; C5 = 22UF ; C6,C7 = 0.1UF; IC1 = RS232 or Max232 or TL232 or SN232; IC2 = RS485 or SN75176 or MAX485 ; TR1 = BC557 or C1383 or c828.