I've only used the instrument with the GPIB so I'm going to make some
guesses. First thing, have you used the Windows accessory program
Hyperterminal to talk to it? Simply sending IDN? should be enough. If
that doesn't work, then you've got the wrong cable or the tranmission
parameters are wrong (baud rate, parity, etc.). If that works, then
there's a couple of things in the driver. One is that the driver sets
the flow control to DTR/DSR in the initialize VI. If that's not how
your instrument is set up, then change the instrument to match or edit
the driver to what you want. another thing in the driver is that ASRL
End In and ASRL End Out are set to TermChar. This is what you want
since you want to terminate writes and reads with a termination
character. What I don't see anywhere is the setting of the actual
termination character. this is usually a carriage return or line feed
and may be settable on the instrument. You may need to add a VISA
property node to set it in the program. If you look at the diagram of
VISA Configure Serial Port, you see how to set the term character. A
hex 0A is a line feed and a hex 0D is carriage return.
