Yes, you can use wired contacts on a Honeywell SiXCT encrypted door/window sensor. If you open a SiXCT sensor you will see there is an auxiliary input terminal dedicated for wired contact usage. When using the auxiliary input terminal there will be an alteration in the programming method. 
 If using the SiXCT external contact option, mount the SiX™ Contact where the wire run is no more than 3 ft.

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