VI Works Single Step at a Time, But Not When Run Normally

I'm very new to LabView and have created a simple VI to record a single measurement from my HP 34401A Multimeter over an RS 232 connection.
The problem that I'm having is that the VI only works when I run it a single step at a time (clicking the single step button until it's completed). When I try to run the entire thing though, I get the following error:
Error -1073807339 occurred at VISA Read in Untitled 2
Possible reason(s):
VISA: (Hex 0xBFFF0015) Timeout expired before operation completed.
After reading through the help page for that error, I tried adding a time delay, but that did not fix the problem.
(http://digital.ni.com/public.nsf/allkb/874B379E24C0A0D686256FCF007A6EA0)
NI I/O Trace didn't provide any answers for me, but I've attached a shot. Lines 1-13 are from the single step run, the rest are from attempting to run the entire thing at once.
Can anyone please help me understand what's going on here? Thanks in advance!
If anyone is interested:
Windows 7
LabVIEW 2009
HP 34401A Multimeter
RS 232 connection is through a USB-Serial adapter
Solved!
Go to Solution.
Attachments:
Front Panel and Block Diagram.png ‏112 KB
NI IO Trace.png ‏91 KB

The only thing I can think of is that you are sending the remote command and then not waiting long enough for it to complete. The manual states:
It is very important that you send the
SYSTem:REMote command
to place the multimeter in the remote mode. Sending or receiving data
over the RS-232 interface when not configured for remote operation can
cause unpredictable results.
And I think we are experiencing unpredictable results.
i don't know if you can change the command into a query by using the *OPC? command, but using that could solve it - or we could run into the same issue because of the caveat mentioned above. Maybe you have to put a manual wait in between the remote command and the write command.
Bill
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VI Works Single Step at a Time, But Not When Run Normally

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