Hi Steve
Are both units using the same parallel Port? Sometimes devices don't like to share one LPT port. You could always buy an add in card for your PC that will give you a second parallel port (LPT2). Then you could run each device on it's own port.
Are both units using the same parallel Port? Sometimes devices don't like to share one LPT port. You could always buy an add in card for your PC that will give you a second parallel port (LPT2). Then you could run each device on it's own port.