HP 16500C Programmer's Manual page 104

Status Reporting
HP-IB Commands
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 the parallel poll.
Table 7-1 Parallel Poll Commands
Command
Parallel Poll Unconfigure
(Multiline Command)
Parallel Poll Configure
(Addressed Command)
Parallel Poll Enable
(Secondary Command)
Parallel Poll Disable
(Secondary Command)
7–14
Mnemonic Decimal
Code
PPU 21
PPC 05
PPE 96-111
PPD 112
ASCII/ISO
Character
NAK
ENQ
I-O
P