First you have to change the labview.ini file and add the line: serialDevices="COM1;COM2;COM3;COM4;COM5;COM6; COM7;COM8;COM9;LPT1;LPT2;LPT3;LPT4;"
Then you can use the LabVIEW Serial Port Write.vi using port number 10, and it will send a string to the parallel port. But, if you have not yet modified your "labview.ini" file, you may receive an error -37. I haven't use this method yet, so if it works, please email me.
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