FAST(?){i}
The FAST command sets the fast data transfer mode on and off. The parameter i selects:
i=0: Off
i=1: On (DOS programs or other dedicated data collection computers)
i=2: On (Windows Operating System Programs)
When the fast transfer mode is on, whenever data is sampled (duri8ng a scan), the values
of X and Y are autom a tically transmitted over the GPIB interface ( this mode is not
available over RS232). The sample rate sets the frequency of the data transfers. It is
important that the receiving interface be able to keep up with the transfers.
To use the FAST2 mode, a ROM version of 1.08 or higher is require d in the SR850. If
you need a ROM upgrade, please contac t Stanford Research Systems. The FAST2
version uses the lock-in transmit queue to buffer the GPIB data being sent to the host.
Since the transmit queue can buffer a maximum of 63 X and Y data pairs, the host casn
only be diverte d for short periods of time (e.g. 120mS at 512Hz sample rate) without
causing the lock- in to “time out” a nd abort the FAST mode data transfer.
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SNAP?i,j{k,l, m,n} 6-23 Records the values of 2, 3, 4, 5, or 6 parameters at
a single instant in time.
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