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Serial communication standard. There are many legacy system using RS232/485 communication, such as PTZ cameras. RS232 is bi-directional 1-to1 communication method, while RS485 is bi-directional half duplex 1-to-n communication method. Use 24AWG UTP for RS485 and proper termination is required at the both termination endings or RS485 communication line.
Only for Box cameras. When cameras are built, they are adjusted to match the lens used in it. While box cameras give you the flexibility to choose different lenses with different focal lengths, it comes at a slightly cumbersome cost, back focusing. A box camera needs to have its back focusing adjusted whenever it is paired with a new lens. You can do this in the lab before installation, or during the installation.