HP 8530A, Руководство по эксплуатации и программированию, Страница: 360 / 439

Programming Examples
Example 22: Frequency List
This example shows how to dene , manipulate , and read frequency list data. First, a
three-segment frequency list is dened and activated. Next, the list and the trace data for
P arameter 1 is output to the computer . Then, single segments (selected by the user) are swept,
the receiver leaves , then re-enters , the Frequency List mode .
Example 23: Using the Receiver's Learn String
This example program performs a User Preset, then prompts the user to change the current
instrument state as desired. The learn string is then read out which includes the changes made
by the user . Another User Preset is done and then the Learn String is loaded into the receiver .
The receiver restores the modied instrument state .
The receiver Learn String is a binary coded string which describes the current instrument state .
This string may be read from the receiver to computer memory via the HP-IB , then it may be
loaded back into receiver memory in order to reset the system to the state represented by the
string. This learn string is transferred using internal receiver binary format (FORM 1), and it
is not intended that the user attempt to decode or modify the string. Please note that each
rmware revision may create learn strings of greater or smaller size (compared to learn strings
created by other rmware revisions). Thus , learn strings created by one rmware version may
not be compatible with earlier or later rmware revisions .
The following commands control transfer of the string.
OUTPLEAS; Output Learn String to HP-IB .
INPULEAS; Input Learn String from HP-IB; Set the receiver controls to that state .
The contents of the learn string is identical to the information processed by the SA VE and
RECALL features for receiver internal storage , and the DISC Store and Load Instrument State
functions for the receiver disc drive .
The following example shows a sequence to transfer the learn string. The learn string is 4390
bytes in length and can be read into an integer type array of length 2195.
DIM Integer Learn_string (4000)
OUTPUT Rec;"OUTPLEAS;"
ENTER Rec_data;Preamble, Size
REDIM Learn_string (1:Size/2)
ENTER Rec;Learn_string (*)
.
.
OUTPUT Rec;"INPULEAS;"
OUTPUT Rec;Preamble, Size, Learn_string (*)
OUTPLEAS; and INPULEAS; select FORM1 data format transfers . The data is transferred in a
sequence beginning with the Preamble , #A; an integer size , that tells the number of bytes to
follow , followed by the receiver internal binary format data which represents the control state
of the receiver , with EOI asserted on the last byte .
HP-IB Programming 18-31