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Conducting
Parallel
a
Example:
Disabling Parallel Poll
Responses
Examples:
HP 1652~/1653B
The PPOLL (Parallel Poll) function returns a single byte containing up to
8 status bit messages for all devices on the bus capable of responding to
the poll. Each bit returned by the function corresponds to the status bit of
the device(s) configured to respond to the parallel poll (one or more
devices can respond on a single line). The PPOLL function can only be
executed by the controller. It is initiated by the simultaneous assertion of
ATN and EOI.
Response = PPOLL(7)
The PPU (Parallel Poll Unconfigure) statement gives the controller the
capability of disabling the parallel poll responses of one or more devices
on the bus.
The following statement disables device 5 only:
P P O L L U N C O N F I G U R E 7 0 5
This statement disables all devices on interface select code 8 from
responding to a parallel poll
P P O L L U N C O N F I G U R E
If no primary address is specified, all bus devices are disabled from
responding to a parallel poll. If a primary address is specified, only the
specified devices (which have the parallel poll configure capability) are
disabled.
Status Reporting
B-l 1
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