Appendix B
B
IEEE 488 Bus & Serial Bus Lines…… 81
IEEE 488 Bus Commands…… 86
ASCII Codes…… 87
ASCII Code Summary…… 87
Decimal Values 00 to 63 - ACG, UCG & LAG…… 87
Decimal Values 64 to 127 - TAG & SCG…… 88
ASCII Code Details…… 89
Decimal Values 00 to 31 - ACG & UCG Characteristics…… 89
Decimal Values 00 to 31 - ACG & UCG Descriptions…… 90
Decimal Values 32 to 63 - LAG…… 91
Decimal Values 64 to 95 - TAG…… 92
Decimal Values 96 to 127 - SCG…… 93
IEEE 488 Bus & Serial Bus Lines
Bus State
Bus Line
Data Transfer (DIO) Lines
8
7
6
5
4
3
2
1
Bus Management Lines
IFC
Interface Clear
REN
Remote Enable
IEEE 488 Interface: Bus Management Lines
ATN
Attention ($04)
0 0 0 0 0 1 0 0
EOI
End-Or-Identify ($80)
1 0 0 0 0 0 0 0
SRQ
Service Request ($40)
0 1 0 0 0 0 0 0
IEEE 488 Interface: Handshake Lines
DAV
Data Valid ($08)
0 0 0 0 1 0 0 0
NDAC
Not Data Accepted ($10)
0 0 0 1 0 0 0 0
NRFD
Not Ready For Data ($20)
0 0 1 0 0 0 0 0
Serial Interface: Bus Management Lines
DTR
Data Terminal Ready ($02)
0 0 0 0 0 0 1 0
RI
Ring Indicator ($10)
0 0 0 1 0 0 0 0
RTS
Request To Send ($01)
0 0 0 0 0 0 0 1
Serial Interface: Handshake Lines
CTS
Clear To Send ($04)
0 0 0 0 0 1 0 0
DCD
Data Carrier Detect ($08)
0 0 0 0 1 0 0 0
DSR
Data Set Ready ($20)
0 0 1 0 0 0 0 0
Hexadecimal & Decimal Values
Hexadecimal Value
$80
$40
$20
$10
$08
$04
$02
$01
Decimal Value
128
064
032
016
008
004
002
001
Digital488/80A User's Manual
Appendix B 85
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