Gould 4070 - Page 68

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Table A 1.2 IEEE-488 Command and Address Messages
ASCII -- IEEE 488 BUS MESSAGES (COMMANDS AND ADDRESSES) HEX CODES
~
0 1
2
3
4
5
ASCII MSG
ASCII
MSG ASCII
MSG l
ASCII
MSG ASCII MSG ASCII
D
0 NUL
DLE
SP
00 0 16
@
00
p
1 SOH GTL DCl
LLO
!
01 1 17 A 01
Q
2
STX DC2
..
02 2 18 B
02 R
3
ETX
DC3
#
03 3
19
c
03
s
4 EOT
soc
DC4 DCL
$ 04 4
20
D 04
T
5
ENQ
PPC
NAK
PPU
%
05 5 21 E
05 u
6 ACK
.J.. SYN
& 06 6
22
F 06
v
7 BEL
ETB
'
07 7
23 G
07
w
8
BS GET CAN
SPE
(
08 8 24 H 08 x
9
HT TCT EM SPD
)
09
-·
9 25 I 09
y
A
LF
SUB
•
10 26 J 10 z
B
VT ESC
+
11
'
27
K 11 [
c FF
FS
'
12
<
28 L 12
\
D
CR
GS
-
13
=
29 M
13
I
E
so
RS
14
>
30
N 14
.
F
SI
us
I
15 ? UNL
0 15
-
"'-
'- ,,------/'-
~'
/'--._
'
' , ' ,
PRIMARY COMMAND GROUP (PCG)
Notes:
I. Device Address messages shown in decimal
2.
Message codes are:
DCL - Devices Clear LLO - Local Lockout
GET -
Device Trigger PPC - Parallel Poll Configure
GTL - Go to Local PPU - Parallel Poll Unconfigure
3. ATN off, Bus data is ASCII; ATN on, Bus data is an IEEE MSG.
(Hi) (Low)
SDC - Selected Device Clear
SPD - Serial Poll Disable
SPE - Serial Poll Enable
6
MSG ASGII
16
17 a
18 b
19
c
20
d
21 e
22
f
23
g
24 h
25
i
2p
j
27 k
28 I
29 m
30 n
UNT 0
_,;'--._
7
MSG ASGII
'"
p
q
r
(.I.l
0
s
0
u
t
(.)
u
u
Q...
>-
al
v
0
w
LLl
z
x
G:
LLl
0
y
(.)
z
z
-
(
z
<-
LLl
:E
)
-
,~
I
DEL
,
MSG
·~
LLJ-
0
0-
u
(,)-
u
Q..._
>-
al_
0
LL)_
z
U.-
LLl
o_
I
(.)
i
Z-
z
<-
I
LLl
'
;:E_
I
I
1'
/
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,,
,,
CD
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