Keithley 2001

IEEE-488 Bus Overview
H-6
Figure H-3
Command codes
D
7
D
6
D
5
D
4
X
0 0 0
Command
X
0 0 1
Command
X
0 1 0
Primary
Address
X
0 1 1
Primary
Address
X
0 1 1
Primary
Address
X
0 1 1
Primary
Address
X
1 1
0
X
1 1 1
Bits
D
3
↓
D
2
↓
D
1
↓
D
0
↓
Column→
Row ↓
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) 7 (B)
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
0 1 0 1 0 0 0 1 0 1 0 1 0 1 0 1
0 1 2 3 4 5 6 7 8 9
10
11
12 13 14 15
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
COMMAND
GROUP
(PCG)
SECONDARY
COMMAND
GROUP
(SDC)
*PPC (PARALLEL POLL CONFIGURE) PPU (PARALLEL POLL UNCONFIGURE), and TCT (TAKE CONTROL) not implemented by Model 2001. Note: D
0
= DIO1 ... D
7
= DIO8; X = Don’t Care.