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ChartScan User’s Manual,
11-97
E-1
Appendix E
Bus States, Bus Lines, and Data Transfer Aspects
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 (&H04) 00000100
EOI
End-Or-Identify (&H80) 10000000
SRQ
Service Request (&H40) 01000000
IEEE 488 Interface: Handshake Lines
DAV
Data Valid (&H08) 00001000
NDAC
Not Data Accepted (&H10) 00010000
NRFD
Not Ready For Data (&H20) 00100000
Serial Interface: Bus Management Lines
DTR
Data Terminal Ready (&H02) 00000010
RI
Ring Indicator (&H10) 00010000
RTS
Request To Send (&H01) 00000001
Serial Interface: Handshake Lines
CTS
Clear To Send (&H04) 00000100
DCD
Data Carrier Detect (&H08) 00001000
DSR
Data Set Ready (&H20) 00100000
Hexadecimal & Decimal Values
Hex Value (QuickBASIC)
&H80 &H40 &H20 &H10 &H08 &H04 &H02 &H01
Decimal Value 128 64 32 16 8 4 2 1
Bus State IEEE 488 Bus Command Data Transfer (DIO) Lines
(ATN is asserted “1”) 8 7 6 5 4 3 2 1
DCL
Device Clear 00010100
GET
Group Execute Trigger (&H08) 00001000
GTL
Go To Local (&H01) 00000001
LAG
Listen Address Group (&H20-3F) 001
addrn
LLO
Local Lock Out (&H11) 00010001
MLA
My Listen Address 001
addrn
MTA
My Talk Address 010
addrn
PPC
Parallel Poll Config 0110
S P2P1P0
PPD
Parallel Poll Disable (&H07) 00000111
PPU
Parallel Poll Unconfig (&H15) 00010101
SCG
Second. Cmd. Group (&H60-7F) 011
commd
SDC
Selected Device Clear (&H04) 00000100
SPD
Serial Poll Disable (&H19) 00011001
SPE
Serial Poll Enable (&H18) 00011000
TAG
Talker Address Group (&H40-5F) 010
addrn
TCT
Take Control (&H09) 00001001
UNL
Unlisten (&H3F) 00111111
UNT
Untalk (&H5F) 01011111
Hexadecimal & Decimal Values
Hex Value (QuickBASIC)
&H80 &H40 &H20 &H10 &H08 &H04 &H02 &H01
Decimal Value 128 64 32 16 8 4 2 1