User manual

:FORMat subsystem
The commands in this subsystem are used to select the data format for
transferring instrument readings over the bus. The BORDer command
and DATA command only affect readings transferred from the buffer. (i.
e. SENSE:DATA? or CALC:DATA? are always sent in ASCII.) These
commands are summarized 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 contains the elements specified by the :ELEMents command. The
specified elements 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
formats. However, some speed is compromised to accommodate the
conversion. 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
Figure 5-1
ASCII data for-
mat
2000-900 (J - Aug 2010) BOOK.fm Page 28 Wednesday, October 12, 2011 12:29 PM