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connecting eurotherm 2404 with Mgate 3180 using 2 cable rs485


I am trying to connect Mgate 3180 to two PID controllers through 485, i used an ethernet cable and 200 ohm between hf and he at 2404 end and a 200 ohm between Mgate ends Data+,Data-.

it doesnt work so i connected the jumpers in Mgate 3180. and it doesnt work neither.

tried to connect through itools, not working also.

what could be the problem?

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