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See below. 3) We can simply soldering these 12 positions either in “OPEN or SHORT” mode to specified the address of this RFID card reader. We treat “OPEN” as to numeric word “1”; “1” means open without solder. Then, we can treat “0” means close, short after soldering. U9 HC573 S8 S1 U8 HC573 S9 S10 S11 S12 open Layout on PCB Short; close - 28
