Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 299)

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.