Imagine NEO DVR-3901, Инструкция по установке и эксплуатации, Страница: 81 / 111

DVR-3901 Installation and Operation Manual 65
Chapter 5: Functions and Controls
Online Operation Modes
The DVR-3901 operates in two different modes: Playlist mode and
BVW/Odetics mode. Select the mode through the
DvrOpMode
parameter. The mode should be set properly before the DVR is used for
recording. If the disk contains pre-recorded material, switching
operating modes may cause undesirable effects, even when the mode is
switched back to the original mode. These effects include video clip
shuffling, time code errors, and even the loss of video clips.
In either mode, you can control the DVR-3901 with an RS-422
controller, or a PC application through the RS-422 or Ethernet port.
Two cables are supplied for this purpose:
•
RS-422 cable - Use this cable if you are using an RS-422 controller.
• PC serial control cable (does RS-232 to RS-422 conversion) - Use
this cable when you are using a PC to control the DVR.
In either mode, you can record different clips with different video bit
rate settings. You can adjust the parameter
VidBitRate at any time. If
you change the bit rate during recording, the change takes effect in the
next recording.
In either mode, use the
SlowMoDisp parameter to select different
display capabilities when the video is played back at less than 1x play
speed, including stepping forward and backward and still frames. The
recommended setting is
F1F1F2F2 or F1 Only for smooth display.
Playlist mode
In Playlist mode, a clip is considered to be a sequence of video frames
that are recorded from when you send a
Record command until you
send a Stop command. These frames are added to the directory where
they appear as discrete clips that can be trimmed and deleted using a PC
application or an edit controller. In Playlist mode, new recordings do
not overwrite existing recordings. When the disk is full, the recorder
cannot record more unless some space is freed by manually deleting
video frames.
If time code is not present at the recorder’s LTC IN connector when
recording the video, the recorder assigns internal time code to every
frame. By default, the internal time code starts at zero with each clip.