National Instruments GPIB-MAC User Manual page 72

November 1985
rpp: Parallel Poll function
Syntax: rppcCR>
Purpose: You use rpp if
obtain information from several devices at the same time.
Remarks: rpp causes the GPIB-MAC to conduct a parallel poll of
previously configured devices by sending the IDY
message (ATN and EOI both asserted) and reading the
response from the GPIB data lines. The GPIB-MAC
pulses the IDY message for greater than or equal to 2
microseconds and expects valid responses within that
time. It remains Active Controller afterward
The GPIB-MAC returns the Parallel Poll Response
representing the decimal value of the response.
If this is the first function you call that requires GPIB
controller capability, and you have not disabled System
Controller capability with rsc, the GPIB-MAC sends
Interface Clear (IFC) to make itself CIC. It also asserts
Remote Enable.
If you passed control to some other GPIB device,
control must be passed back to you or you must send
IFC to make yourself CIC before making this call.
Otherwise, the ECIC error will be posted.
Refer also to ist,
parallel polls.
61 SECTION FOUR - FUNCTIONS
you wish to conduct a parallel poll to
ppc, ppu,
and to Appendix F on