I need to control 24 relays.
Can I connect 3 VM8090-modules to my PC?
Can I do that when I have only 1 usb-port on my computer (via USB hub)?
Thanks
Long version:
The relays are powered by an external power supply, not by the USB port, so power is not an issue
An USB hub can be used (if it supports USB 1.1 or 2.0)
Each card will get its own virtual COM port
Short version: no problem 