XLR PIN-2 goes to the center contact of the RCA, this carries the signal.
XLR PINs-1 and 3 are tied together and carry the Ground via the Chassis. This connects to the Surround of the RCA.
All Hosa cables and adaptors, including hard-wired stage snakes and stage boxes, purchased in the USA are warranted by Hosa Technology, Inc. to be free of defects in material and workmanship for the lifetime of the original purchaser. All other Hosa products are warranted for one year.