Advantech PCL-848A/B User Manual page 34

Purpose :
This command conducts a parallel poll of the interface bus. It returns the value (0-
255) of an eight-bit byte represent- , ing the response of those devices of the interface
which have been configured to respond to a parallel poll (see the PPOLLC command).
Offset :
PPOLL%=24
Syntax :
CALL PPOLL%(RESPONSE%)
CALL ABSOLUTE(RESPONSE%,PPOLL%)
Parameter :
RESPONSE% -
Bus Activity :
ATN and EOI are set true for 25 microseconds.
The parallel poll byte is read.
EOI is set false.
ATN is set false.
2 8 PCL-848AB
An integer equals to the result of parallel polling. Value 0-255
of an eight bit byte represents the parallel poll response of the
devices of the interface bus.
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