
ASCII Character Codes & IEEE 488 Bus Line Messages V. APPENDIX
V-370 Personal488 User’s Manual, Rev. 3.0
V. APPENDIX
Bus States, Bus Lines & Bus Commands
Bus State Bus Lines Data Transfer (DIO) Lines
8 7 6 5 4 3 2 1
Hex Value (QuickBASIC)
&H80 &H40 &H20 &H10 &H08 &H04 &H02 &H01
Decimal Value 128 64 32 16 8 4 2 1
Bus Management Lines
IFC
Interface Clear
REN
Remote Enable
IEEE 488 Interface: Bus Management Lines
ATN
Attention (&H04) 00000100
EOI
End-Or-Identify (&H80) 1 0 0 0 0 0 0 0
SRQ
Service Request (&H40) 01000000
IEEE 488 Interface: Handshake Lines
DAV
Data Valid (&H08) 00001000
NDAC
Not Data Accepted (&H10) 0 0 0 1 0 0 0 0
NRFD
Not Ready For Data (&H20)00100000
Serial Interface: Bus Management Lines
DTR
Data Terminal Ready (&H02)00000010
RI
Ring Indicator (&H10) 0 0 0 1 0 0 0 0
RTS
Request To Send (&H01) 0 0 0 0 0 0 0 1
Serial Interface: Handshake Lines
CTS
Clear To Send (&H04) 00000100
DCD
Data Carrier Detect (&H08) 00001000
DSR
Data Set Ready (&H20) 00100000
Bus State Bus Commands Data Transfer (DIO) Lines
(IEEE 488) (ATN is asserted “1”)
8 7 6 5 4 3 2 1
Hex Value (QuickBASIC)
&H80 &H40 &H20 &H10 &H08 &H04 &H02 &H01
Decimal Value 128 64 32 16 8 4 2 1
DCL
Device Clear x0010100
GET
Group Execute Trigger (&H08)
x0001000
GTL
Go To Local (&H01) x0000001
LAG
Listen Address Group (&H20-3F)
x01addrn
LLO
Local Lock Out (&H11) x0010001
MLA
My Listen Address x 0 1 a d d r n
MTA
My Talk Address x 1 0 a d d r n
PPC
Parallel Poll Config x 1 1 0 S P2 P1 P0
PPD
Parallel Poll Disable (&H07)x0000111
PPU
Parallel Poll Unconfig (&H15)
x0010101
SCG
Second. Cmd. Group (&H60-7F)
x11commd
SDC
Selected Device Clear (&H04)x0000100
SPD
Serial Poll Disable (&H19) x0011001
SPE
Serial Poll Enable (&H18) x0011000
TAG
Talker Address Group (&H40-5F)
x10addrn
TCT
Take Control (&H09) x0001001
UNL
Unlisten (&H3F) x0111111
UNT
Untalk (&H5F) x1011111
(x = “don’t care”)
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