Keithley 2016 - Figure 5-1 ASCII Data Format; Figure 5-2 IEEE754 Single Precision Data Format (32 Data Bits)

SREAL will select the binary IEEE754 single precision data format.
Figure 5-2 shows the normal byte order format for each data element. For
example, if three valid elements are specified, the data string for each reading
conversion is made up of three 32-bit data blocks. Note that the entire data
string is preceded by a single 2-byte header that is the binary equivalent of an
ASCII # sign and 0.
Reading*
±1.23456789 E±00 VDC, 0INTCHAN
Mantissa
Exponent
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
%THD = Distortion in Percent
DB = Distortion in dB
*An overflow reading is displayed as +9.9E37 with no units.
Channel
Number
0 = No channel
1 to 400 = Channel Number
Units:
INTCHAN = Internal Channel
EXTCHAN = External Channel
Fi
gure
5
-
1
A
SCII data format
Byte 1
70
Header
# 0
Byte 2
70
Byte 3
70
Byte 4
70
se f
s = sign bit (0 = positive, 1 = negative)
e = exponent bits (8)
f = fraction bits (23)
Normal byte order shown. For swapped byte order,
bytes sent in reverse order: Header, Byte 4, Byte 3,
Byte 2, Byte 1.
The Header is only sent once for each measurement conversion.
F
igure 5-2
I
EEE754 single
p
recision data
f
ormat (32 data
bits)
entire data string.
SCPI Command Reference 5-31