i have proved the rios and belled thar cable and all is ok but the rios will not work when on the network

Move your rkp onto line two and put rios on line 1 and try a cold start. what voltage you got at rios? are they powered from panel or seperate psu

Okay, take all the rio's off link though the a&b line & Terminate with resistor .

Measure from panel end, if correct place known good Rio at end running of the fully charged panel battery

Unless a very long network run you should have one Rio on the next work when you exit eng

SORTED! it turned out to be a faulty rio. when you test it on its own it works fine but when you stick it on the network with other rio's it pulls the others down but still works fine its self. got there at long last