Keithley 2002 User Manual

IEEE-488 Bus Overview
D-7
Table D-2
Hexadecimal and decimal command codes
Command Hex value
Decimal
value
GTL
SDC
GET
LLO
DCL
SPE
SPD
LAG
TAG
SCG
UNL
UNT
01
04
08
11
14
18
19
20-3F
40-5F
60-7F
3F
5F
1
4
8
17
20
24
25
32-63
64-95
96-127
63
95
Table D-3
Typical addressed command sequence
Step Command ATN state
Data bus
ASCII Hex Decimal
1
2
3
4
UNL
LAG*
SDC
Set low
Stays low
Stays low
Returns high
?
0
EOT
3F
30
04
63
48
4
*Assumes primary address = 16.
Table D-4
Typical common command sequence
Step Command 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
?
0
*
R
S
T
3F
30
2A
52
53
54
63
48
42
82
83
84
*Assumes primary address = 16.
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.

Keithley 2002 Specifications

General

Resolution	8.5 digits
DC Voltage Accuracy	±0.0006%
Maximum DC Voltage	1000 V
Maximum AC Voltage	750 V
Maximum DC Current	3 A
Maximum AC Current	3 A
Connectivity	GPIB, RS-232
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Resistance Range	10 Ω to 1 GΩ
Model	2002
Category	Multimeter
Interface	GPIB, RS-232
AC Current Accuracy	±0.1%
Frequency Range	0.1Hz to 300kHz
Display	VFD
Type	Digital
Power Supply	100-240V AC, 50/60Hz
Current Range (DC)	100 μA to 3 A
Current Accuracy (DC)	±0.01%
Current Range (AC)	100 μA to 3 A
Current Accuracy (AC)	±0.1%
DC Current Range	100 μA to 3 A
AC Current Range	100 μA to 3 A