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Statement Bus Action Summary
The following tables show the bus actions that take place when the various IEEE-488 control statements are executed. The table is broken down into System and Non-System Controller, then into Active and Non-Active Controller, and further subdivided into interface select code only or primary address specified. The mnemonics used in the tables are listed below:
ATN - Attention Line PPD - Parallel Poll Disable
DCL - Device Clear PPE - Parallel Poll Enable
EOI - End or Identify PPU - Parallel Poll Unconfigure
GET - Group Execute Trigger REN - Remote Enable
GTL - Go to Local SDC - Selected Device Clear
IFC - Interface Clear SPD - Serial Poll Disable
LAG - Listen Address Group SPE - Serial Poll Enable
LLO - Local Lockout TAG - Talk Address Group
MLA - My Listen Address TCT - Take Control
MTA - My Talk Address UNL - Unlisten
PPC - Parallel Poll Configure UNT - Untalk
ABORT
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
IFC
REN
~ATN
Error
IFC
REN
~ATN
Error
ATN
MTA
UNL
~ATN
Error
No Action
Error
CLEAR
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ATN
DCL
ATN
MTA
UNL
LAG
SDC
Error
Error
ATN
DCL
ATN
MTA
UNL
LAG
SDC
Error
Error
LOCAL
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
~REN
~ATN
ATN
MTA
UNL
LAG
GTL
~REN
Error
ATN
GTL
ATN
MTA
UNL
LAG
GTL
Error
Error
LOCAL LOCKOUT
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ATN
LLO
Error
Error
Error
ATN
LLO
Error
Error
Error
PASS CONTROL
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
Error
ATN
UNL
TAG
TCT
~ATN
Error
Error
Error
ATN
UNL
TAG
TCT
~ATN
Error
Error
PPOLL
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ATN
EOI
read
~EOI
ATN*
Error
Error
Error
ATN
EOI
read
~EOI
ATN*
Error
Error
*Restore ATN to previous state
PPOLL CONFIGURE
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
Error
ATN
MTA
UNL
LAG
PPC
PPE
Error
Error
Error
ATN
MTA
UNL
LAG
PPC
PPE
Error
Error
PPOLL UNCONFIGURE
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ATN
PPU
ATN
MTA
UNL
LAG
PPC
PPD
Error
Error
ATN
PPU
ATN
MTA
UNL
LAG
PPC
PPD
Error
Error
REMOTE
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
REN
~ATN
REN
ATN
MTA
UNL
LAG
REN
Error
Error
Error
Error
Error
SPOLL
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
Error
ATN
UNL
MLA
TAG
SPE
~ATN
read
ATN
SPD
UNT
Error
Error
Error
ATN
UNL
MLA
TAG
SPE
~ATN
read
ATN
SPD
UNT
Error
Error
TRIGGER
System Controller
Not System Controller
Active Controller
Not Active Controller
Active Controller
Not Active Controller
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ISC Only
Primary
ATN
GET
ATN
MTA
UNL
LAG
GET
Error
Error
ATN
GET
ATN
MTA
UNL
LAG
GET
Error
Error