Right Umesh, Both Nifty and BankNifty are in Sell mode since 24th.
BankNifty : Signalled short on 24th @ 10,958
Nifty : Signalled short on 24th @ 6,186
Level of buy is known where the ST Indicator trails price. As of now :
Buy for Nifty, if price close above : 6,125 / Current price 6,085
Buy for BankNifty, if price close above : 10,800 / Current price 10,695
Price bar should close above the signal to buy. If the price reverts below the signal, it will be a short again. Supertrend will keep you in the trade, long or short.
Do revert for questions / clarifications. It helps to clear thinking and though process - Mine as well.