Dahua HDCVI series - Audio Input, Output, and Bidirectional Audio; Alarm Input;Output Connection

HDCVI Series DVR User’s Manual
81
Figure 2-63
2.3.14 HCVR710XH-S2 Series
Please refer to Figure 2-64 for connection sample.
The following figure is based on the HCVR7108H-S2 series product.