9detailed information. A/B cable of the RS485 is for the A/B cable connection of the speed PTZ.2.3.4 Alarm relay specificationsModel: JRC-27FMaterial of thetouchSilverRating（ResistanceLoad）Rated switch capacity 30VDC 2A, 125VAC 1AMaximum switch power 125VA 160WMaximum switch voltage 250VAC, 220VDCMaximum switch currency 1AInsulation Between touches with samepolarity 1000VAC 1minuteBetween touches with differentpolarity1000VAC 1minuteBetween touch and winding 1000VAC 1minuteSurge voltage Between touches with samepolarity 1500V (10×160us)Length of opentime3ms maxLength of closetime3ms maxLongevity Mechanical 50×106 MIN (3Hz)Electrical 200×103 MIN (0.5Hz)Temperature -40℃ - +70℃2.4 Bidirectional talk2.4.1 Device-end to PC-endDevice ConnectionPlease connect the speaker or the pickup to the first audio input port in the device rear panel. Thenconnect the earphone or the sound box to the audio output port in the PC.Login the Web and then enable the corresponding channel real-time monitor.Please refer to the following interface to enable bidirectional talk. See Figure2-5.Figure 2-5
