Rs485 - ADT DVR7800S-U Series User Manual

1.4 RS485

When the DVR receives a camera control command, it transmits that command through the coaxial
cable to the Pan/Tilt/Zoom (PTZ) device. RS485 is a single-direction protocol; the PTZ device can't
return any data to the unit. To enable the operation, connect the PTZ device to the RS485 (A,B) input
on the DVR.
Since RS485 is disabled by default for each camera, you must enable the PTZ settings first. The
Hybrid DVR supports multiple protocols such as Pelco D and Pelco P.
To connect PTZ devices to the DVR:
1. Connect RS485 (A,B) on the DVR rear panel.
2. Connect the other end of the cable to the proper pins in the connector on the camera.
3. Follow the instructions to configure a camera to enable each PTZ device on the DVR.
DVR7800S-U Series Hybrid DVR User Guide
Figure 1-5
2 Getting Started
RS485 port
6