
Have you turned everything off (e.g. 5520A and 725A), re-booted the PC and re-started MET/CAL? It appears you are controlling the 725 via "Serial 2 to UUT" on the rear of the 5520A, based on the second error message shown. The 5520A is reporting that the buffer for this serial port has filled before it was emptied (e.g. read by MET/CAL).
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