Using Your 8 Channel Video Audio Standby
5
5 Using Your 8 Channel Video Audio Standby
This section describes how to connect and operate your 8 Channel Video
Audio Standby.
Connect the video and audio sources to the appropriate inputs of the VS-28 8
Channel Video Audio Standby unit, where input 1 of each channel is the
Master input, and input 2 is the standby channel. Be sure to connect the audio
channels with the correct polarities.
You can either use the audio as Left, Ground and Right signals (for stereo) or
use the "R" for "+" and the "L" for "-" for balanced mono.
Connect up to 8 video/audio acceptors to output sockets. Use the best cables
available in order not to impair signal quality and bandwidth.
Each channel has two pins (on the audio connector) each marked as "C".
When the main signal (IN 1) of this channel drops, an internal relay shorts
both pins to each other. This can be used, for example, to activate an alarm.
Each channel has an additional pin on the "audio block" marked "M". When
this pin is remotely connected to the ground (using a pair of wires) this
channel is forced to switchover to input 2.
When the master video (IN 1) drops out of any channel, the machine switches
over to the standby input (IN 2) of this channel. At the same time, it activates
the internal relay that shorts together the pins marked "C" on the audio
connector and lights an LED with of appropriate channel number on the front
panel.
There are two extra ground connections available on the audio section of
channel 8 for any desired use. The connections are each marked "G".
Turn on the VS-28 8 Channel Video Audio Standby and all sources and
acceptors. The VS-28 8 Channel Video Audio Standby detects the existence
of Odd/Even sync information; therefore it cannot be misled by erroneous
signals. If all master video inputs are available and are standard video signals,
all front LEDs will be off.
By using the remote control function with the "M" pin mentioned above, the
VS-28 8 Channel Video Audio Standby can become an 8x2x1 video/audio
switcher.
The channels may be cascaded to increase the number of standby sources, for
example: connect the output of channel 1 to IN1 of channel 2 and connect the
acceptor to the OUT socket of channel 2. In this case, if IN 1 of channel 1
drops out, IN 2 of channel 1 "kicks" in. If IN 2 of channel one drops out too
(and IN 1 is still absent) IN 2 of channel 2 "kicks in", etc.
