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NVR Cannot control PTZ.

  Possible Problem
- Front panel PTZ error
 -  Cable connection is not correct.
- The Distance is too far.
- PTZ setup is not correct. 
- PTZ decoder setup, connection or installation is not correct.
- PTZ decoder and NVR protocol is not compatible.
-  PTZ decoder and NVR address is not compatible.
- When there are several decoders, please add 120 Ohm between the PTZ decoder A/B cables furthest end to delete the reverberation or impedance matching. Otherwise the PTZ control is not stable.