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The parameter list is optional. Any omitted parameter is set to a
default value:
<intval>
<# values>
<addr>
<sweep #>
= i, i.e. leave no values out
= # values on the screen
= address of left-most value on the screen
= 0, i.e. read all sweeps
Thus, the omission of all parameters results in all the data values
on the screen
being
read.
A detailed
explanation
of the data
addressing conventions is given in Section 7.9.
If the user does not specify the number of data values, READ DATA
transfers are executed over the number of data values displayed on
screen + i, i.e. if the screen shows nominally 25000 data values,
25001 values are transferred.
Data formats:
- The descriptor
(.DESC),
the data (.DATA) and the time(s)
(.TIME) are each transmitted
as a single block unless
maximum
block size has been specified
with the command
COMM BLOCKSIZE.
- When all data are read (.*), they are transmitted as three
blocks in the order: descriptor, data, time(s).
- When all sweeps of a SEQNCE data record are read (sweep #
0), each sweep is transmitted as a separate block.
- The parameter
<# values>
applies
to the number
of data
values per sweep in the case of SEQNCE data.
Note:
If the 9400A receives a command to read CHANNEL I or CHANNEL 2 while
it is acquiring data, the execution of the command will be-delayed
until the TRIGGER has arrived.
The 9400A sets the VALUE ADAPTED bit:
- if <intval> is greater than 16000 (it is adapted to 16000).
- if <# values> corresponds to too large a value (it is adapted to
the number corresponding to the last accessible value).
- if <addr> is out of range (it is adapted
to the nearest legal
address).
- if <sweep #> is higher that the selected number of sweeps (it is
adapted to the last sweep number).
7-25
Remote Operations
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