APPLICATIONS (WHERE TO USE THE SYSTEM)
This system can be used anywhere that a video signal on coax cable
or twisted pair exists. Some uses are in a CCTV camera installation,
LASER OPTICAL transmission, STL microwave applications, Broadcast TV
transmissions, Cable TV, Relay, Alarm and Control and many other
applications. Relay control can be sent in either direction on the
video cable and both directions when two sets of units are used.
TROUBLESHOOTING THE INSTALLATION
When installing ATU-2HD and ARU-2HD units care must be taken to
assure that both units are set to the same channel and video mode or
standard for operation including (TVI,CVI,AHD ect), then determine the
number of line (720p, 1080P) ect, then determine the frames per second
or frame rate (12.5, 25, 30 ect. Then see the chart to determine the
correct switch settings. If all the switches are set the same on the
ATU-2HD and ARU-2HD units, they will operate on the same selected video
line and video mode or video format.
It is also important to select the proper format of video for
correct operation. Check with your cameras specifications for the video
type or format of the video source, be it HD-TVI, HD-CVI, AHD, PAL, or
CVBS (NTSC) the USA format for standard definition (SD) video. If you
experience the relays in the ARU-2HD chattering on and off, then it is
most likely that the Video Mode selector switches 3-7 are not set
correctly for the format of video being used.
If only one of the two relays operate then check the Line Selector
settings switches 1-2 and make sure they are set the same on both units
and make sure they are not set to a line that exceeds the maximum line
setting for the selected video format. Also, we have determined that
some HD cameras put signals in the first few lines of the vertical
interval to help balance the DC component of the video coming out of
the vertical interval. If you find that the relays on the receiver are
always on and the LEDs are always lit then select a different channel
of operation with DIP switches 1-2.
If you have no relay operation, then check for power at each unit
and make sure that the GREEN Power LED is on and not flashing. A
Flashing LED indicates no video input to the unit. When any format of
video is applied the Power LED will turn on solid and stop flashing.
If the relays turn on and off every few seconds, then check your
video signal for any ground loops. Ground loops can disrupt video
images and display horizontal bars, normally two on the screen at a
time moving up the screen slowly. If you have this condition, then lift
the camera side of the video cable off any local ground and use only
the DVR side of the system for the cable ground. Non powered balun
style ground loop blockers can also be used to remove the ground loops.
If your relay signal is going from the camera to the DVR the
signal generated in the ATU-2HD will pass through amplifiers and other
active (powered) devices and work fine. However, if you wish to pass
signals up the coaxial cable in the opposite direction from the flow of
the video signal you may not have any active (powered) equipment in the
path of the ATU-2HD units signals. Amplifiers will block the reverse
path from DVR to Camera for control.
ATU-2HDisb PAGE 6 OF 7
