I am trying to identify which communication protocol is being used in our irrigation system. It has a base field unit which communicates with the RTU's via a 2 wire system. The wire length to the last RTU is around 6 kms and the signal strength seems to be fairly marginal at that end. So I would like to be able to find some sort of signal booster to fit in the line, but first I think I need to know what type of signal protocol it uses. Any help would be greatly appreciated.
Thanks
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