S Mode Functions
Chapter 5
GPIB-232CT User Manual
5-34
© National Instruments Corp.
rpp - Request (Conduct) a Parallel Poll
Type:
Parallel Poll function
Syntax:
rp
p
<CR>
Purpose:
You
use
rpp
if you wish to conduct a parallel poll to obtain
information from several devices at the same time.
Remarks:
rpp
causes the GPIB-232CT 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-232CT 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-232CT returns the Parallel Poll Response (PPR)
following the poll in the form of a numeric string 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-232CT 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.
See Also:
ist
,
ppc
,
ppu
, and Appendix F,
Parallel Polling
.
