Keithley 486 User Manual

SECTION 4
IEEE-488 Reference
1
r
1
G6 Fonat (Reverse order : Intel CPU) :
Header *
ReqdinQ **
I
II
I
6 Bytes 1 LSB 1
I
) MSB ( LSB 1
MSB * * *
*.
d”tS
Expdnent
(16 bit signed)
(16 bit signed)
G7 Format (Normal order : Motorola CPU) :
Header *
I
Reading **
I
I
II
I
6 Bytes 1 MSB 1
I
1 LSB 1 MSB 1 1 LSB --*
co:nis Expdnent
* Headers for the G6, and 07 formats are shown in Fig. 4-4
**When recalling data from the buffer, one header
is followed by one or more readings, depending
on buffer size.
NOTE : True reading = Counts X lOExponent
‘igwe 4-2.
G6 and G7 Bina y Data Formats (Counts/Exponent)
05 Format (Normal order ; Motorola CPU)
Header *
Reading **
r--l-
6 Bytes
lByteljByte2)Byte31Byte4 ---
Sign Jk$Marltissa
(1 Bit) (8 Bits)
(23 Sits)
(single precision, IEEE-754)
G4 Format (Reverse order ; Intel CPU) : Reading bytes sent in reverse order ;
Header*, Byte 4, Byte 3, Byte 2, Byte 1
‘Headers for the G4 and G5 formats are shown in Fig. 44
** When recalling data from the buffer, one header
is followed by one or more readings, depending
on buffer size.
%we 4-3.
G4 and G5 Bimrv Data Formats (IEEE Std. 754)

Keithley 486 Specifications

General

Brand	Keithley
Model	486
Category	Measuring Instruments
Language	English