PSI BOX PLUS+ Reference
Control Functions
DISABLE.
Prevents Devices Responding Parallel Poll.
_______
_______________________________________________
Purpose.
To prevent all or selected devices responding to the
__________
parallel poll command.
The DISABLE command is a very flexible way to prevent
one or more devices, which has been previously CONFIGUREd,
from responding to parallel polls.
If no device address is specified then the PSI BOX uses
the universal PPU command to prevent all bus devices
responding to the parallel poll. All the devices will need to be
reCONFIGUREd if they are to take part in future parallel polls.
If one or more device addresses are given then those devices are
commanded to Listen and then told to via the PPD command not
to respond to the parallel poll.
Format.
DISABLE
_________
Params.
None, one or more.
_________
Returns.
None.
__________
Example.
________
_
BUS DISABLE
all devices now unable to respond
BUS DISABLE 2,3,4
device 2,3 & 4 unable to respond
Bus Activity.
___________
_
assert ATN if not already so
PPU all devices cannot respond
or
assert ATN if not already so
UNT
UNL
LAG listen 1st device in sequence.
PPC
PPD
UNL repeat sequence with next device if any
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Chapter 8
