User manual

IEEE-488 Reference
2001-900-01 Rev. K / August 2010 4-83
REAL,32 or SREal will select the binary IEEE754 single precision data format. cáÖìêÉ=QJOM= 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 will be made up of three 32-bit data blocks. Note that the data
string for each reading conversion is preceded by a 2-byte header that is the binary equivalent of an
ASCII # sign and 0.
REAL,64 or DREal will select the binary IEEE754 double precision data format and is shown in cáÖìêÉ
QJON= (normal byte order shown). This format is similar to the single precision format except that it is 64
bits long.
cáÖìêÉ=QJNV
ASCII data format
Reading Time Stamp
Reading
Number
Channel
Number
±1.2345678E±00NVDC, ±1234567.123456secs, ±123456rdng#, 01intchan
Mantissa Exponent Units
(seconds)
Units
(reading
number)
Units:
VDC = DC Volts
VAC = AC Volts
ADC = DC Current
AAC = AC Current
OHM = 2-wire Resistance
OHM4W = 4-wire Resistance
HZ = Frequency
Status:
N = Normal
O = Overflow
R = Reference (Rel)
C = Temperature in °C
F = Temperature in °F
K = Temperature in K
00 = No channel
01 to 80 = Channel Number
Units:
intchan = Internal channel
extchan = External channel
cáÖìêÉ=QJOM
IEEE754 single precision data format (32 data bits)
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.