Ok, my friends help me with that page copy.
I marked the Warning about dual sync cord by red color:
Electric input type in Z330 and Z240 strobes is identical, pulled up by resistor to +battery voltage. Inon realizes, if one strobe with better batteries has higher voltage on input lines than other strobe in a pair, this influence is not good for electronics. That is why Inon doesn't recommend to connect 2 strobes in parallel directly (without isolation diodes). As electronics engineer, i can understand such recommendation. But in concrete case, my opinion is that Warning is just overinsurance, by the following reason:
Modern dual sync cords don't have direct parallel connection between 2 strobes. They have isolation diodes /transistors inside, which prevent influence of one strobe to another.
The same isolation (using transistors) have UWTechnics TTL-Converters on the board. User can connect any pairs of strobes by sync cords, even different type strobes with different supply voltages, it does not matter. This is a system of isolation and safety onboard.
And of course, user can use Dual Fiber Optic cables.
For TTL systems the best are 613-core cables (Japanese optical core, 613 fibers inside). It has the best transmission index at our market now.
Edited by Pavel Kolpakov, 12 April 2019 - 06:35 AM.