Most external devices use USB, BlueTooth or Wifi to communicate with their host PC, but some still use the old tried and trusted serial RS232 or RS485.
Here at Philtronix we have years of experience with serial devices, from printers to LED displays, CCTV and various alarm systems.
If you have an old device that you still use but it can only connect to an aging XP or even DOS PC, give us a call, see if we can create you an updated program for Windows 10 or Linux.
Perhaps you have a large building and you want to use some simple LED text signs to help your customers ?