GPIB
370B User Manual
4-19
Transferring the Curve. When a waveform is transferred to the controller, it must
first be displayed, When a waveform is transferred from the controller it must go
directly to the mass storage, The routes and commands are shown in Figure 4–6.
370B
Figure 4-6: Transfer of waveforms
To copy displayed data in Store or View mode to the controller, first send a
WFMpre? query to transfer the preamble. Then send a CURve? query to transfer
the curve.
To copy the data from mass storage to the controller, first send a DISplay
VIEw:<index> command to display the curve stored at the index location. Then
send a WFMpre? query to transfer the preamble from the display. Last, send a
CURve? query to transfer the curve from that location. Another command,
WAVfrm?, combines the functions of WFMpre? and CURve? and return the
whole display, preamble plus curve, with an ASCII semicolon between them.
For the curve data, in general, provisions will have to be made for a string length
of about 4125 bytes. The response will be a short (25 bytes or characters) ASCII
string identifying the curve, two bytes giving the number (in binary) of data
points to follow, the 4096 bytes representing the actual curve data, and a
checksum (one binary byte).
Transferring the Waveform to Mass Storage. Another possibility for storing data
under control of the bus is to put the waveform into a mass-storage waveform-
storage location. Use the ENTer <NR1> command, where the number, <NR1>,
is the storage location index.
To Next Page
Loading...