Format Subsystem - Keithley SourceMeter 2400 User Manual

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2400 Series SourceMeter User's Manual

FORMat subsystem

The commands for this subsystem are used to select the data format for transferring instru-
ment readings over the bus. These commands are summarized in
Data format
[:DATA] <type>[,length]
:FORMat[:DATA] <type>[,<length>]
Parameters
<type>[,<length>] = ASCii
NOTE
<length> is not used for the ASCii or SREal parameters. It is optional for the
REAL parameter. If you do not use <length> with the REAL parameter, the
<length> defaults to 32 (single precision format).
Query [:DATA]?
Description This command is used to select the data format for transferring readings
over the bus. Only the ASCII format is allowed over the RS-232 inter-
face. This command only affects the output of READ?, FETCh?,
MEASure?, TRACe:DATA?, CALC1:DATA? and CALC2:DATA? over
the GPIB. All other queries are returned in the ASCII format.
NOTE
Regardless of which data format for output strings is selected, the SourceMeter
will only respond to input commands using the ASCII format.
ASCII format
The ASCII data format is in a direct readable form for the operator.
Most BASIC languages easily convert ASCII mantissa and exponent to
other formats. However, some speed is compromised to accommodate
the conversion.
includes all the data elements. (See
page
Figure 18-1
not specified by the :ELEMents command are simply not included in the
string.
Keep in mind that the byte order can only be reversed for the binary for-
mat. (See
Figure 18-1
ASCII data format
+1.000206E+00, +1.000000E-04, +1.000236E+04, +7.282600E+01, +4.813200E+04
Voltage
Reading
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SCPI Command Reference
Select data format
ASCII format
REAL,32 IEEE754 single precision format
SREal IEEE754 single precision format
Query data format
Figure 18-1 shows an example ASCII string that
"ELEMents <item list>,"
18-51.)
also shows the byte order of the data string. Data elements
"BORDer <name>," page 18-56, command.)
Current Resistance Time
Reading Reading
18-49
Table 18-3.
Status