Kingfisher Plus+ Hardware Manual
6.8.5 4-Wire Line, point-to-point
Either RTU can transmit/receive at any time.
Note: line termination is required.
6.8.6 4-Wire Line, multi-drop
Master RTU can transmit/receive to any one outstation RTU at any time or each outstation
can transmit/receive to master RTU, one at a time.
Note that outstations cannot communicate to each other.
Hardware Manual Version 7.16
http://www.servelec-semaphore.com/
Page 110
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