USB to 422 Converter Woes

I have a USB to RS422 converter that was packaged with an IMS MDrive 23 stepper motor controller. I probably should have bought the NI Converter as I
can’t get LabView to write to the port. The device is nicely packaged with a
driver that makes it appear in Device Manager like a standard serial port.
M&A Explorer seems to like it and will open a VISA session.
I can’t get past the LabView standard VISA Write command. It issues a
“Could Not Perform operation because of an I/O error" or a “The specified
attribute is not defined or supported by the referenced resource" error.
When I reboot the motor controller, it issues a “reboot successful“message
that can be read from the port from LabView, so I am communicating with the
port and controller in one direction.
Without changing anything, HyperTerminal communicates
successfully.
Any ideas will be cheerfully and thankfully appreciated.

I have used the IMS converter with Labview, but only to test basic comms. If I recall, it echoed back the command, but I believe that can be disabled in the MDrive.
Attachments:
IMS Write Read.vi ‏22 KB

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LittlemanTAMU wrote:
Has anyone had success using any USB to parallel port converter? I've tried 3 different cables including one that supposedly supported the full IEEE-1284 standard, but all of them show up only as a virtual printer port. Is there a way to get access to this port through LabView? Are there any cables/converters out that actually show up as a regular parallel port? I've searched far and wide for one, but had no luck. I searched the boards to see if anyone had done this, but most of the posts were over a year old and had no resolution confirming whether or not a proposed solution worked or not. Thanks in advance for any help,
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