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