HP 54501A Programming Reference Manual page 80

Parallel
Poll
Enable Command. The parallel poll
enable secondary
command
(PPE)
configures the devices which have received the PPC
command to respond to
a
parallel poll on
a
particular
HP-IB
DIO
line
with
a
particular
level.
Parallel Poll Disable Command. The Parallel Poll
disable secondary
command
(PPD)
disables the devices which
have received the
PPC
command from responding to parallel poll.
Table
3-4.
Parallel Poll Commands
Command
Parallel Poll Unconfigure
(Multiline Command)
Parallel Poll Configure
(Secondary Command)
Parallel Poll
Enable
(Secondary Command)
Parallel Poll Disable
(Secondary
Command)
Mnemonic
PPU
PPC
PPE
PPD
Decimal
Code
21
05
96-111
112
ASCII/ISO
Character
NAK
ENQ
1-0
P
Message Communication and System Functions
3-38
HP 54501A
Programming