typedef struct h
{
  U8    SDser[8]  ; // serial number
  U8    SDaddr    ; // address assigned to sign
  U8    SDdips    ; // dipswitch setting
  U8    SDtype    ; // type of sign
  U8    SDwidt    ; // width
  U8    SDhgth    ; // height
  U8    SDfill[256-14] ;  // fill struct to be 256 long
  
    // put this one last
  U8    SDerno    ; // here store error number if FRAM match/update failed.
} SIGN_DESC;