Keithley 6220 User Manual

Model 6220/6221 Reference Manual IEEE-488 Bus Overview C-13
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Note that ATN is true for both the listen command and the SDC command byte
itself.
Table C -5 gives a typical common command sequence. In this instance, ATN is
true while the instrument is being addressed, but it is set high while sending the
common command string.
Table C- 4
Typical bus sequence
Step
Com-
mand ATN state
Data bus
ASCII Hex Decimal
1
2
3
4
UNL
LAG*
SDC
Set low
Stays low
Stays low
Returns high
?
.
EOT
3F
2C
04
63
44
4
*Assumes primary address = 12.
Table C- 5
Typical addressed command sequence
Step
Com-
mand ATN state
Data bus
ASCII Hex Decimal
1
2
3
4
5
6
UNL
LAG*
Data
Data
Data
Data
Set low
Stays low
Set high
Stays high
Stays high
Stays high
?
.
*
R
S
T
3F
2C
2A
52
53
54
63
44
42
82
83
84
*Assumes primary address = 12.
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Keithley 6220 Specifications

General

Brand	Keithley
Model	6220
Category	Measuring Instruments
Language	English