same connector to be mechanically inter engageable or may be identical connectors reoriented as in the case of hermaphrodite connector systems for simplicity the electrical connectors 26 a and 26 b and all connectors 26 in fig2 are depicted with only four conductive inserts 41 for example conductive pins or sockets which may each receive the common conductor 34 and three signal conductors 35 a 35 c as is understood in the art each conductive insert 41 provides an electrically independent conductive path within mating electrical connectors 26 referring still to fig1 the connector 26 b in beacon module 12 b may be attached to and communicate with for example a printed circuit board 40 carrying on it multiple light emitting diodes leds 42 as shown leds 42 are connected between the common conductor 34 and signal conductor 35 a attached to inserts 41 occupying the extreme left and right positions of the connector 26 b accordingly electrical power applied to signal conductor 35 a will energize the leds 42 of beacon module 12 b so that the light may be viewed through transparent housing 63 although the leds 42 are shown connected in parallel series connections are also possible using constant current driving circuitry current sharing resistances for each led 42 when connected in parallel have been omitted for clarity the upper edge.