Keithley 486 Instruction Manual page 98

SECTION4
IEEE-488 Reference
G5
and G7 Header (6 bytes) :
Data Forma! :
0000000 = CounisfExponeti
OWOOOl = IEEE Bid 754
I-
Byte Order :
0 = Nond (Motomla)
1 = rieversec (Intel)
G4
and G6 Header (6 bytes) :
MSB LSB
L7--l -
I
Function :
Byte-Count"
000001 = current
(1 &bit unsigned)
000011 = ",I Ohms
Reserved
- 1 = REL enabled
-Byte Order :
0 = Nom4 (Motorola)
1 = Revemed (Intel)
F&on :
000001 = cument
000011 = vi, Ohms
1
Reserved
-1 = REL enabled
The ASCII dataformat is ina directreadable form fortheoperator. Most BASIC languageswill
eady convert ASCII mantissa and exponent to other formats. However, some speed is cornpro-
mised to accommodate the conversion.
The Count and Exponent format has some advantages over the ASCII format. It require fewer
bytes, transfers to the computer faster, and is compatible with most programming languages.
This format is particularly useful when collecting data on a fixed range (autorange disabled).
The IEEE Standard 754 Single Precision format requires few bytes, and is used without conver-
sion in popular personal computer programming languages.
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