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Type
M - Multiline
U - Uniline
Class
AC - Addressed Command
AD - Address (Talk or listen)
UC - Universal Command
ST - Status
Other B1, B2, etc. - Information Bits
Blanks - Doesn't Care condition
MESSAGE
DESCRIPTION
M
N
MESSAGE
E
M
NAME
ACG
Addressed Command Group
ATN
Attention
DAB
Data Byte
DAC
Data Accepted
DAV
Data Valid
DCL
Device Clear
END
End
EOS
End Of String
GET
Group Execute Trigger
GTL
Go To Local
IDY
Identify
IFC
Interface Clear
LAG
Listen Address Group
LLO
Local Lock Out
MLA
My Listen Address
MTA
My Talk Address
MSA
My Secondary Address
NUL
Null Byte
OSA
Other Secondary Address
OTA
Other Talk Address
PCG
Primary Command Group
Table 4-4. IEEE-488 Remote Message Coding
T
C
D
D
Y
L
I
P
A
O
O
E
S
8
7
S
M AC
0
U UC
M DD B8 B7 B6 B5 B4 B3 B2 B1
U HS
U HS
M UC
0
U ST
M DD B8 B7 B6 B5 B4 B3 B2 B1
M AC
0
M AC
0
U UC
U UC
M AD
0
M UC
0
M AD
0
M AD
1
M SE
1
M DD
0
M SE
(OSA = SCG and MSA-NOT)
M AD
(OTA = TAG and MTA-NOT)
M ----
(PCG = ACG or UCG or LAG or TAG)
IEEE-488 Interface Overview
DD - Device Dependent
HS - Handshake
SE - Secondary
Logic Zero = 0 = False
Logic One = 1 = True
DATA
BUS
D
D
D
D
D
D
I
I
I
I
I
I
O
O
O
O
O
O
6
5
4
3
2
1
0
0
0
1
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
1
1
0
1
0
0
0
1
1
B5 B4 B3 B2 B1
0
B5 B4 B3 B2 B1
1
B5 B4 B3 B2 B1
0
0
0
0
0
0
Remote Operation
HAND-
BUS
SHAKE
MANAGEMENT
D
N
N
A
E
S
I
A
R
D
T
O
R
V
F
A
N
I
Q
D
C
1
1
0
0
1
1
0
1
0
1
1
1
1
1
1
1
1
4
I
R
F
E
C
N
1
4-11
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