US 11,722,333 B2
Multiplexing of switch data mixing NC (normally closed) and NO (normally open) contacts
Sylvain Bernot, Montgiscard (FR); and Julien Serieys, Lunan (FR)
Assigned to RATIER-FIGEAC SAS, Figeac (FR)
Filed by Ratier-Figeac SAS, Figeac (FR)
Filed on Aug. 9, 2019, as Appl. No. 16/536,430.
Claims priority of application No. 18306476 (EP), filed on Nov. 9, 2018.
Prior Publication US 2020/0153654 A1, May 14, 2020
Int. Cl. H04L 12/40 (2006.01); G05G 9/047 (2006.01); H01H 25/04 (2006.01)
CPC H04L 12/40039 (2013.01) [G05G 9/047 (2013.01); H01H 25/04 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A multiplexer switching device comprising:
a first data network comprising a plurality of normally open (NO) contacts; and
a second data network comprising a plurality of normally closed (NC) contacts; wherein:
said first data network is connected to said second data network via a common DC voltage link;
each of said NO contacts is electrically connected to a respective one of said NC contacts;
the common DC voltage link provides DC voltage to both of the first and second data networks simultaneously;
each of the individual NC and NO contacts is connected to and paired with a resistor R, wherein said resistors have values that are selected so that equivalent impedance is specific to each configuration case of contact activations, and
said multiplexer switching device is mountable in a side stick for a helicopter;
wherein said switching device is a four-direction switching device.