Bill, How are you reading from 5334A? Is the read-after-write mode OFF? I recommend the following sequence:
++auto 0 -- turn off read-after-write ++read eoi -- read until EOI is asserted by the instrument ++read eoi .... (If your instrument does not assert EOI, specify a character to terminate ++read command. See manual for details.) Yes, ++read will address the instrument to talk, read any output, and then address it to listen. We are testing an update that resets the controller if it detects a hung GPIB bus. I can send that to you offline. Regards, Abdul -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of wje Sent: Wednesday, August 27, 2008 3:12 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Prologix GPIB-NET, HP 5370A, HP5334A problem? I just got one of the new networked GPIB controllers, and I've been having some issues. I'm not sure if it's the Prologix or the instruments, or both. With the 5370A, I can get samples for some period of time ranging from about 2 to 4 hours before the GPIB controller stops responding. I suspect this one might be the 5370A -488 controller bug I've heard of. However, there is no way to recover without power-cycling the Prologix. Even if this is the 5370A, the Prologix should really have an asynchronous reset capability. With the 5334A, I can get samples for as long as I want, no problem. However, if I set the 5334A to 'WA1' mode, which is supposed to wait until the counter is addressed before taking each sample, what happens is that I can read one value. Every successive read returns the same value; the 5334A never triggers for a new sample. Either I don't understand the behavior of WA1, although HP's sample program indicates that what I've described is proper, or there is some incompatibility between the Prologix and the 5334A. Unfortunately, the documentation for the Prologix is scanty at best. There is no description of the actual IEEE-488 handshake process that's going on. For example, does the Prologix do an unlisten after a read? The HP docs seem to indicate that in WA1 mode, a sample starts when the 5334A is addressed. So, if it's never unlistened, perhaps it never takes a new sample? Any thoughts or suggestions would be appreciated. -- Bill Ezell ---------- They said 'Windows or better' so I used Linux. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.