Need to clear old data from usb / serial

[uod-jhardy]

Hi,
I am using the dmm to read data on a "once per cycle" basis in a python loop. I can see the multimeter screen has changed significantly but the data read from the usb is hardly changed. I realise that there is a pipeline of data being read and I am only seeing the next entry in the list ( around 0.5 s after the initial reading) when it should be a reading from ~10s later. I can clear the list by using dmm(connect=None) followed by dmm(connect=/usb0, model...) but this stops program execution and does not always reconnect. Is there a simple way to make only one reading and then clear the rest of the entries?

BTW I am using a BTMETER BT-90EPC which works fine when model UniTrend_UT60E is used

[uod-jhardy]

I can program around this but I think that I am asking if the is a way of making sure that only one reading is taken in the first place?