Table C-4 Typical Bus Sequence; Table C-5 Typical Addressed Command Sequence - Keithley 6220 Reference Manual

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