EZWatch TurboView DVR - Manual (Page 123)

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 F Type Using RS-232: Connect RS-232 port to USB port at front/rear of DVR by using a converter.
14.4 Link
14.4.1 Link Setup
 Click “Setup>Link>” then shows as below.
(NOTE)
The above menu is only available on the DVR model with Serial-In function.
 Click “Serial In” to appear following screen.