|Follow the software installation directions for the device. E.g. sometimes you must install software for it BEFORE you first plug it in.|
If you think you did that incorrectly, you would be wise to un-install any listing for it's software in Add/Remove Programs, or whatever your NT has that is similar, and then install it's software the right way.
If the parallel port is built into the mboard, most parallel port connected devices will not work, or not work properly, or may not even be detected properly, or the software installation for the device may not detect the the parallel port properly, unless...
the parallel port mode in the mboard's bios Setup is set to EPP, ECP, or ECP/EPP mode. Usually EPP mode works fine - ECP mode may not. ECP requires that there is an available dma channel - sometimes it's not available, sometimes you can choose from more than one in the bios Setup when you select ECP.
If you're using a parallel port card in a slot, the same applies - the card must be capable of EPP, ECP, or EPP/ECP mode - older cards are not capable of that.
If you're using a USB to parallel port adapter that has the proper necessary circuits built in for that (follow the software installation directions for the device - see above!), most if not all of them were designed to be used with ONLY printers and may NOT work with other parallel port connected devices - if that's your case, you will probably need to install a PCI enhanced (capable of EPP, ECP, or EPP/ECP mode) parallel port card and connect the device to that, if you have no onboard parallel port, or if you do but it's being used for something else.
If your mboard has ISA slots, most ISA cards with a parallel port are NOT capable of EPP, ECP, or EPP/ECP mode - SOME later ISA multi I/O cards (may still be available new, or used) and ISA stand alone parallel port cards (quite rare) are.
USB devices may not work correctly when they're connected to certain USB ports, e.g. ports in a hub or on the front of a desktop case.
See response 3 in this:
I'm not familiar with NT of any version.
In Win 95, 98, 98SE, and probably ME, if you have the parallel port in ECP mode in the bios, the support for that is NOT installed in Windows automatically (unless, possibly, it was set that way when Setup was last run) - you have to use Add/Remove Hardware to find and install the ECP parallel port support (it shows up under Ports in Device Manager) ; EPP mode does not require anything like that.
Win 2000 and up automatically install ECP printer port support, if it's required dma channel is available.