Measurement-computing Micro 488/EX rev.2.1 Manuel d'utilisateur télécharger pdf (Page 81)

Section 5 Command Descriptions

5.11

ABORT

As the System Controller (SC), whether the Micro488/EX is the Active

Controller or not, the

ABORT

command causes the Interface Clear (IFC) bus

management line to be asserted for at least 500 microseconds. By asserting IFC, the

Micro488/EX

regains control of the bus even if one of the devices has locked it up

during a data transfer. Asserting IFC also makes the Micro488/EX the Active

Controller. If a Non-System Controller was the Active Controller, it will be forced to

relinquish control to the Micro488/EX.

ABORT

forces all IEEE bus device interfaces

into a quiescent idle state.

If the Micro488/EX is a Non System Controller in the Active Controller state

(*SC•CA), it asserts attention

(ATN), which halts any bus transactions, and sends its

talk address to "untalk" any other talkers on the bus. It does not (and cannot) assert

IFC if in the *SC state.

SYNTAX ABORT

RESPONSE None

MODE SC or *SC•CA

BUS STATES IFC, *IFC (SC)

ATN•MTA (*SC•CA)

EXAMPLES PRINT#1,"ABORT"

PRINT#1,"AB" Using abbreviated form

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Measurement-computing Micro 488/EX rev.2.1 Manuel d'utilisateur Page 81