Keithley 6482, Reference Manual

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C-10 Return to
Section Topics
6482-901-01 Rev. A / August 2012
Appendix C: IEEE-488 Bus Overview Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Figure C-3
Command codes
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 C-3 lists 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 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.
D
7
D
6
D
5
D
4
X 0 0 0
Command
X 0 0 1
Command
X
0 1 0
X 0 1 1
X
1 0 0
X 1 0 1
X 1 1 0
X
1 1 1
Bits
D
3
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
D
2
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
D
1
0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
D
0
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Column
Row
0 1 2 3 4 5 6 7 8 9
10
11
12 13 14 15
0 (A) 0 (B) 1 (A) 1 (B) 2 (A) 2 (B) 3 (A) 3 (B) 4 (A) 4 (B) 5 (A) 5 (B) 6 (A) 6 (B) 7 (A)
NUL SOH
STX ETX
EOT
ENQ
ACK
BEL
BS
HT
LF
VT
FF
CR SO
SI
GTL SDC
PPC*
GET
TCT*
DLE
DC1 DC2 DC3 DC4 NAK
SYN
ETB
CAN
EM
SUB
ESC
FS
GS
RS
US
LLO DCL
PPU*
SPE
SPD
SP
! "
# $
%
&
' ( )
• +
,
_
. /
0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15
0 1 2 3 4 5 6 7 8 9
: ;
< = >
?
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
UNL
@
A B C D
E F
G H
I J
K
L
M
N
O
0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15
P
Q
R
S
T
U
V
W
X Y Z
[ \ ]
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
UNT
a b c d e
f
g h
i j
k
l
m
n o
p q
r s t
u v
w
x y z :
=
DEL
~
ADDRESSED
COMMAND
GROUP
(ACG)
UNIVERSAL
COMMAND
GROUP
(UCG)
LISTEN
ADDRESS
GROUP
(LAG)
TALK
ADDRESS
GROUP
(TAG)
Primary
Address
Primary
Address
Primary
Address
Primary
Address
*PPC (PARALLEL POLL CONFIGURE) PPU (PARALLEL POLL UNCONFIGURE), and TCT (TAKE CONTROL) not implemented by Model 6482. Note: D
0
= D101 ...D
7
= D108; X = Don't Care.
SECONDARY
COMMAND
GROUP
(SDC)
PRIMARY
COMMAND
GROUP
(PCG)