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VINStrument
The VINStrument subsystem operates with the ARM and TRIGger subsystems to
control the virtual instrument features of the HP E1429A/B. These features include
the ability to use the Local bus and the VME (VXI data transfer) bus to obtain
buffered measurement data from memory or real time measurement data directly
from the analog to digital converter.
Local Bus transfers
There are two ways to transfer data over the Local bus:
Data can be transferred directly from the analog to digital converter(s) using the
ARM and TRIGger subsystems in conjunction with the INITiate command.
Everything proceeds exactly the same as if readings were going to HP E1429B
internal memory, except in this case, readings are going to the Local bus as well as
to internal memory. If the consumer on the Local Bus is unable to maintain the data
transfer (sampling) rate, then the data going out over the Local bus is lost and an
error is indicated.
The second method of transferring data over the Local bus is to empty the
HP E1429B internal memory after the measurements have occurred. This transfer
will automatically proceed after the measurements are completed if the user has
previously set the VINStrument:CONFigure:LBUS:MODE to APPend, GENerate,
or INSert, and if VINStrument:CONFigure:LBUS:FEED is one of the "MEM:xxx"
choices. If the measurement is aborted with the ABORt command, or if
VINStrument:LBUS:MODE is OFF or PIPline during the measurement, then no
automatic transfer is attempted. Instead, the
VINStrument:CONFigure:LBUS:MEMory:INITiate command must be used to start
the transfer after the MODE and FEED have been set to the desired values. When
using this method, the ARM source is automatically set to IMMediate, and the
trigger source is set to LBUS. This allows the receiving module(s) on the right to
control the data transfer, and assures that transfers occur only when the receiving
module is ready to receive data; thus no data will ever be lost. The trigger and arm
sources are returned to their previous values with the next INITiate command.
VINStrument Subsystem Command Reference 283