PSI BOX PLUS+ Reference
Control Functions
NO ATN.
Release The Atn Line.
_________
___________________
Purpose.
To cause the PSI BOX to release the ATN, attention,
__________
line when it is not transferring data. The PSI BOX stops being
the ACTIVE controller and returns to the controller idle state.
Byte 9 in the IEEE control status string contains 1 when the
ATN line is asserted true, controller active and 0 when the ATN
line is false, controller idle.
The PSI BOX will return to the idle state in between each
data transfer sequence.
Format.
NO ATN
_________
Params.
None.
_________
Returns.
IEEE control status string byte 9 = 0
__________
If the PSI BOX was already in the controller idle
state then this command has no effect.
Example.
________
_
BUS NO ATN
:REM ISSUE COMMAND
BUS STATUS
:REM READ STRING
ATN at position 9 :REM ATN = 0
Bus Activity.
___________
_
release ATN.
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Chapter 8
