Halloechen!
I try to find all conncected GPIB devices with the GPIB function
"FindLstn". However, additionally to the really connceted devices
this function find something with address #21. If I disconnect all
devices, it really finds nothing (as expected). But no matter
which devices are activated (Keithley, an ols Epson printer and a
homebrew thing), this #21 appears on the list.
I use a GPIB-USB-B.
I call the routine in a C++ program as follows:
FindLstn(GPIB0, Instruments, Result, 31);
if (ibsta & ERR)
{
GPIBCleanup(GPIB0, "Unable to issue FindLstn call");
return 1;
}
int Num_Listeners = ibcntl;
for (int i=0; i < Num_Listeners; i++)
cout << Result[i] << '\n';
This odd phantom device seems
to become a problem when "SendList"
ist called:
SendList(GPIB0, Result, "*IDN?", 5L, NLend);
This call always fails.
Any ideas what's happening here? Thank you!
Tschoe,
Torsten.
--
Torsten Bronger, aquisgrana, europa vetus
