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Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Manual de usuario Pagina 299

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15A. Driver488/DRV Commands III. COMMAND REFERENCES - 15. Command References
III-284 Personal488 User’s Manual, Rev. 3.0
ABORT
SYNTAX
ABORT[addr]
RESPONSE
None
MODE
SC
or
*SC
•
CA
BUS STATES
IFC, *IFC (SC mode)
ATN, MTA (*SC
•
CA mode)
SEE ALSO
SYS CONTROLLER
EXAMPLE
PRINT#1,"ABORT"
As the System Controller (
SC
), whether Driver488 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
, Driver488 regains control of the bus even if one of the devices has locked it up during a
data transfer. Asserting
IFC
also makes Driver488 the Active Controller. If a Non System Controller
was the Active Controller then it is forced to relinquish control to Driver488.
ABORT
forces all IEEE
488 device interfaces into a quiescent state.
If Driver488 is a Non System Controller in the Active Controller state (
*SC
•
CA
), it asserts attention
(
ATN
), which stops any bus transactions, and then sends its Talk address to “Untalk” any other Talkers
on the bus. It does not (and cannot) assert
IFC
.
ARM
SYNTAX
ARM interrupt [[,]interrupt...]
RESPONSE
None
MODE
Any
BUS STATES
None
SEE ALSO
DISARM, LIGHT PEN; OnEvent (Sub-Chapter 15B)
EXAMPLE
100 ON PEN GOSUB 1000
Set up service routine.
110 PEN ON
Enable interrupt polling.
PRINT#1,"ARMSRQ"
Detect Service Request
1000 PRINT#1,"SPOLL16"
Get Serial Poll status from
1010 INPUT#2,STATUSBYTE
device and act accordingly.
1999 RETURN
Done with interrupt.
The following
ARM
conditions are supported:
Condition Description
SRQ
The Service Request bus line is asserted.
Peripheral
An addressed status change has occurred and the interface is a Peripheral.
Controller
An addressed status change has occurred and the interface is an Active Controller.
Trigger
The interface has received a device
Trigger
command.
Clear
The interface has received a device
Clear
command.
Talk
An addressed status change has occurred and the interface is a Talker.
Listen
An addressed status change has occurred and the interface is a Listener.
Idle
An addressed status change has occurred and the interface is neither a Talker nor a
Listener.
ByteIn
The interface has received a data byte.
ByteOut
The interface has been configured to output a data byte.
Error
A Driver488 error has occurred.
Change
The interface has changed its addressed state. The Controller/Peripheral or
Talker/Listener/Idle states of the interface have changed.
The
ARM
command allows Driver488 to signal to the user specified function when one or more of the
specified conditions occurs.
ARM
sets a flag corresponding to each implementation of the conditions
indicated by the user.
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