Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Manual do Utilizador Página 144

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II. SOFTWARE GUIDES - 8. Driver488/DRV 8P. Command Descriptions
Personal488 Users Manual, Rev. 3.0 II-129
If a command is preceded by an asterisk (
*
), that command is unasserted. For example,
*REN
states
that the remote enable line is unasserted. Conversely,
REN
without the asterisk states that the line
becomes asserted.
The bus states are further described, according to the following bus lines:
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 (&H14) 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 = dont care)
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