... Product Description optical multimeter tester MODELBF-Test-808(5) CCTV Security TesterVideo Test multimeter+optical meter+cctv testerSignal modeNTSC/PAL ... in a series of sond frequency signal,to test the sound is normal or not.PTZ controllerCommunicationRS232, ... RS422 simplex and RS485PTZ ProtocolPelco-D, Pelco-P; Samsung, Panasonic, LiLin or customizedBaud Rate150,300,600 ...