Measurement Computing Micro 488/EX rev.2.1 - Manual (Page 131)

Section 5 Command Descriptions
5.61
PPOLL DISABLE or PPD
PPOLL DISABLE disables the Parallel Poll response of selected bus devices.
SYNTAX PPOLL DISABLE addr[,addr…]
or
PPOLL D addr[,addr…]
or
PPD addr[,addr…]
addr is a bus device address
RESPONSE None
MODE CA
BUS STATES ATN•UNL, MTA, LAG, PPC, PPD
EXAMPLE PRINT#1,"PPOLL DISABLE18,06,13"
Disable Parallel Poll response of devices 18, 6, and 13.