VISA Close sending 0x0 character

Hi,
Labview 8.5.1
I open a serial port with VISA open, send and receive data, and then close things down with a VISA Close.
However, the VISA Close is sending a 0x0 character on the serial line which is confusing the target instrument. I can replicate this behaviour with MAX and with the serial port examples.
How can I prevent the VISA Close from sending the rogue character? It's important that I do close the resource without closing the program in this instance.
TIA,
Richard.

Eric,
Thanks for the reply.
I first noticed the issue communicating with a homebrew embedded processor, but I can demonstrate the effect by running the Basic Serial Write and Read.vi, hooking the outgoing COM port back to a second incoming COM port (crossing the TX and RX lines, of course) and monitoring that with Com Port Toolkit. I see the outgoing *IDN?<carriagereturn><newline>
Timestamp                                 Hex chars received                                ASCII representation
08:16:21.124                             2A 49 44 4E 3F 0D 0A                            *IDN?..
and then about half a second later, the 0x00.
08:16:21.655                              00
Manually inserting a x second wait before the Visa Close delays the 0x00 by a corresponding amount.
If I use the Measurement & Automatum explorer, select the com port,  open the visa test panel, select the viWrite tab, and Execute the test repeatedly, I get repeated *IDN?.. strings and it's only when I close the test panel that the 0x00 comes through. ( I can also see a 0x00 coming through when I Validate the session - I assume it's opening and closing it?)
I have attached a Capture.spy session.
Thanks,
Richard.
Attachments:
Capture.spy ‏4 KB

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