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You can send the "72 53 01 2F 01 50" command via the uDemo to the MiniSmart II to increase the reader's transaction Interval.(Default is No Delay). See the excerpt below for the syntex of this command:

  1.  Set EMV CT L2 Transaction Interval

Command Body is 72 53 01 2F 01 <CTL2 Interval>


CTL2 Interval Value



No Delay

30 ~ 100

300ms ~ 1000ms

Here is the uDemo - Downloads page.