J&S United Technology Hyper Vision DHV-1640 series, Руководство пользователя

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You can test the Time Server function by clicking “Time Server test”.
When you select “ RF Clock” Synchronization, you can click “ Test” button to do the “RF
clock test”. Then, the DVR will issue a command to RF clock to get Time information and
display it on the screen. RF Clock can be connected to the DVR through RS232 port.
Notes
:
1. Configuring Time Synchronization will reboot DVR.
2. When you synchronize DVR time by RF Clock, the selection of RS232 COM port( COM 1
or COM 2) in System configuration must be the same as the physical connection.