Hmmm.... Interesting ideea. It might work . I'll test this in two days and I'll post reply here. But I feel like something is missing me . Not sure what exactly , but ... if the main system scans lines, and at the time t0 it scans line 3 and I am shorting line 1 column 1 , the result will be different than if the system scans other line and I am shorting line 1 column 1. right ? Not sure but ... I'll try this. Thank you very much.