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www.thinkSRS.com Data Transfer SR800 Series Application Note #13 Continuous Data Transfer Using the SR810, SR830 and SR850 FAST command Problem: Some users have needed a way to continuously transfer data from SRS DSP lock-in amplifiers to a host computer using the GPIB interface. The FAST command was developed to send the X and Y data over GPIB synchronously with the lock-in's internal data storage buffer. The original version of the FAST command was only suitable for DOS host programs or other dedicated data collection computers. Specifically, FAST would not work if the host computer was running a multi- tasking OS, such as Windows. This is because the host computer was required to accept data bytes from the lock-in with no more than a 50