PLANET NVR-420 - Manual (Page 53)

Adding a camera manually
Simply follow the instruction described above but instead of using the “Search”
function, enter the camera’s IP address and credential in the “Camera
Information” manually and then follow step 5 and 6 described above.
2. 1.
Enter manually
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4-CH H.264 Network Video Recorder with HDMI
User’s Manual of NVR-420