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To do that please follow the instructions:
Connect COM port only locally on single device using simplex fiber cable -
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this will create internal loopback for all video channels and channel 1 will
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appear on output 5, channel 2 on output 6 and so on. Please do the same for
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each device. This will allow us to see which device has a problem and if it's a
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problem with transmitter or receiver.
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Only loopback the Com 1 port as shown in the panel diagram below. 