＊There is something wrong with the frontal PTZ.
＊The setting, connection or the installation of the PTZ decoder is not correct.
＊The connections are not correct.
＊The PTZ setting of the DVR is not correct.
＊The protocols of the PTZ decoder and the DVR are not matched.
＊The address of the PTZ decoder and the DVR are not matched.
＊When multiple decoders are connected, the far port of the PTZ decoder line A(B) must connect a 120Ω resistance to reduce the reflection, otherwise the PTZ control is not stable.
＊The distance is too far.