10-4 DISPlay, FORMat, and SYSTem
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 Table 11-2.
NOTE The FORMat commands are only used if the exponential GPIB output format is se-
lected. The output format is selected from output format of the GPIB menu item of the
menu (see “Output Format” in Section 6 for details).
FORMat[:DATA] <type> Select data format
:FORMat[:DATA] <type>
Parameters <type> = ASCii ASCII format
SREal IEEE754 single precision format
DREal IEEE754 double precision format
This command is used to select the data format for transferring readings over the bus. The
reading(s) that is sent (voltage, current, pulse-current, DVM or long integration) depends on the
presently selected function. See the :FUNCtion command (SENSe subsystem) and signal ori-
ented measurement commands for more information.
NOTE Regardless of which data format for output strings is selected, the power supply 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 compro-
mised to accommodate the conversion. The following shows the ASCII format for a reading of
10.058 volts.
+1.00580000 E+01
IEEE754 formats
SREal will select the binary IEEE-754 single precision data format. Figure 10-1 shows the
normal byte order format for each data element (voltage, current, etc.). Note that the data string
for each reading conversion is preceded by a 2-byte header that is the binary equivalent of an
Table 10-2
SCPI commands — data format
Command Description Default Ref
FORMat
[:DATA] <type>
:BORDer
<name>
Specify data format; ASCii, SREal or DREal.
Specify byte order; NORMal or SWAPped.
ASCii
SWAP
A
B
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