Table D-2 Hexadecimal And Decimal Command Codes; Table D-3 Typical Addressed Command Sequence; Table D-4 Typical Common Command Sequence - Keithley 2002 User Manual

Table D-2
Hexadecimal and decimal command codes
Command Hex value
GTL 01
SDC 04
GET 08
LLO 11
DCL 14
SPE 18
SPD 19
LAG 20-3F
TAG 40-5F
SCG 60-7F
UNL 3F
UNT 5F
Table D-3
Typical addressed command sequence
Step
1
2
3
4
*Assumes primary address = 16.
Table D-4
Typical common command sequence
Step
1
2
3
4
5
6
*Assumes primary address = 16.
Decimal
value
1
4
8
17
20
24
25
32-63
64-95
96-127
63
95
Command ATN state
UNL Set low
LAG* Stays low
SDC Stays low
Returns high
Command ATN state
UNL Set low
LAG* Stays low
Data Set high
Data Stays high
Data Stays high
Data Stays high
Typical command sequences
For the various multiline commands, a specific bus sequence
must take place to properly send the command. In particular,
the correct listen address must be sent to the instrument
before it will respond to addressed commands. Table D-3
lists a typical bus sequence for sending the addressed multi-
line commands. In this instance, the SDC command is being
sent to the instrument. UNL is generally sent as part of the
sequence to ensure that no other active listeners are present.
Note that ATN is true for both the listen command and the
SDC command byte itself.
Table D-4 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 com-
mand string.
IEEE command groups
Command groups supported by the Model 2002 are listed in
Table D-5. Common commands and SCPI commands are not
included in this list.
Data bus
ASCII Hex Decimal
? 3F
0 30
EOT 04
Data bus
ASCII Hex Decimal
? 3F
0 30
* 2A
R 52
S 53
T 54
IEEE-488 Bus Overview
63
48
4
63
48
42
82
83
84
D-7