Although dollar's cross-inspired selloff from Monday's 85.91 high to 83.66 earlier suggests correction from last week's 15-year low at 83.58 has ended, subsequent rebound to 84.67 suggests choppy trading sideways trading is in store and above said 84.67 resistance would extend gain to 84.90/00 but reckon 85.20/25 would cap upside.  
On the downside, below 83.66 would signal downtrend has resumed and further weakness towards measured objective at 83.10 would follow.