Stanford Research Systems SR780, Руководство по эксплуатации и программированию, Страница: 464 / 497

5-98 Data Transfer Commands
SR780 Network Signal Analyzer
Ch2 (1). After the download is complete, the Capture Length will be set to the
length of the download.
The download data must be data which was originally uploaded by CGET in its
entirety. The CGET and CPUT commands allow a host computer to save and
reload the Capture buffer without using disks.
The download sequence is as follows:
Host
Send CPUT ? i. Do NOT wait for IFC to be set in the Serial Poll status.
SR780
Returns 1 (4-byte binary long int) when OK to begin binary transfer to the
SR780. A return of 0 indicates that there is no Capture memory allocated.
Host
On receipt of 1 (4-byte binary long int), executes a binary transfer to the SR780
of n bytes (as uploaded using CGET). Asserts EOI with the final byte of the
transfer.
SR780
Receives n bytes and the EOI. If an error is detected during transfer, the Capture
buffer reverts to the empty state and a command execution error occurs. This
may occur if there is insufficient Capture memory allocated.
Serial Poll until IFC (bit 7) is set in the Serial Poll status before sending another
command.
WGET ?
The WGET command uploads the Waterfall buffer to the host computer. This
command is valid only via the GPIB interface.
The uploaded data should be saved in its entirety by the host computer. The
saved data can be downloaded back to the SR780 at a later time using WPUT.
The WGET and WPUT commands allow a host computer to save and reload the
Waterfall buffer without using disks.
The upload sequence is as follows:
Host
Send WGET ?. Do NOT wait for IFC to be set in the Serial Poll status.
SR780
Returns n (4-byte binary long int) which is the number of bytes needed to
transfer the Waterfall buffer.
Host
On receipt of n (4-byte binary long int), executes a binary read from the SR780
of n bytes. Expect EOI with the final byte of the transfer.