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Chapter 2: InstallationNote: You can attach an extension to the RS-485 port on the back panel.Connecting external devicesWhen connecting external devices to include as part of the entire system, such as aUSB drive or any other USB devices, connect those devices only when the unitdisplays live view. The TVR 30 recognizes external devices only after the unit has gonethrough the initialization process.8 <strong>TruVision</strong> <strong>DVR</strong> 30 User Manual