:FORMat subsystem
The commands in this subsystem are used to select the data format for trans-
ferring instrument readings over the bus. The BORDer command and DATA
command only affect readings transferred from the buffer. (i. e. SENSE:DA-
TA? or CALC:DATA? are always sent in ASCII.) These commands are sum-
marized in Table 5-4.
:DATA command
[:DATA] <type>
:FORMat[:DATA] <type> Specify data format
Parameters <type> = ASCII ASCII format
SREAL IEEE754 single precision format
DREAL IEEE754 double precision format
Query [DATA]? Query data format
Description This command is used to select the data format for transferring readings over
the bus. For every reading conversion, the data string sent over the bus con-
tains the elements specified by the :ELEMents command. The specified el-
ements are sent in a particular order.
The ASCII data format is in a direct readable form for the operator. Most
BASIC languages easily convert ASCII mantissa and exponent to other for-
mats. However, some speed is compromised to accommodate the conver-
sion. Figure 5-1 shows the ASCII format that includes all the data elements.
±1.23456789E±00VDC, 0INTCHAN
Reading*
Channel
Number
Mantissa Exponent
Units:
INTCHAN = Internal Channel
EXTCHAN = External Channel
0 = No channel
1 to 400 = Channel Number
Units:
VDC = DC Volts
VAC = AC Volts
ADC = DC Current
AAC = AC Current
OHM = 2-wire Resistance
OHM4W = 4-wire Resistance
HZ = Frequency
C = Temperature in °C
F = Temperature in °F
K = Temperature in K
* An overflow reading is displayed as +9.9E37 with no units
5-28 SCPI Command Reference
Figure 5-1
ASCII data format
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