Keithley 2001 Operator's Manual page 441

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
q~ÄäÉ=dJO
Hexadecimal and decimal command values
Step
1
2
3
4
5
6
Assumes primary address = 16.
q~ÄäÉ=dJQ
Typical common command sequence
2001-900-01 Rev. K / August 2010
Decimal
value
1
4
8
17
20
24
25
32-63
64-95
96-127
63
95
Step Command ATN state
1 UNL Set low
2 LAG* Stays low
3 SDC Stays low
4 Returns
high
*Assumes primary address = 16.
q~ÄäÉ=dJP
Typical bus sequence for addressed multiline commands
Command ATN state
UNL Set low
LAG* Stays low
Data Set high
Data Stays high
Data Stays high
Data Stays high
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 be-
fore it will respond to addressed commands.
a typical bus sequence for sending the addressed multiline
commands. In this instance, the SDC command is being sent
to the instrument. UNL is generally sent as part of the se-
quence 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 G-4 gives a typical common command sequence. In
this instance, ATN is true while the instrument is being ad-
dressed, but it is set high while sending the common com-
mand string.
Data bus
ASCII Hex Decimal
? 3F 63
0 30 48
EOT 04 4
Data bus
ASCII Hex
? 3F
0 30
* 2A
R 52
S 53
T 54
IEEE-488 Bus Overview
Table G-3 lists
Decimal
63
48
42
82
83
84
G-7