I had a working Windows XP system using an IOGear GUC232A USB PDA/Serial Adapter to connect my HP palmtop and synchronize with ActivSync using COM5. I also have a CyberPower UPS that uses COM1.
Yesterday, I disconnected the COM1 cable and plugged in a cable for a LEGO Spybotics robot. This brought crashed my system (probably the power management COM1 sensitivity). So, I restored the original cable.
Now, I can no longer communicate on COM5. I've tried reinstalling the ActivSync software and the IOGEAR driver (can't seem to find it on my IOGear CD). The driver it is looking for is "ATEN USB to Serial Bridge."
When I ran the IRQ summary, there is no allocation for COM5 which I understand should be IRQ 3 or 4. COM1 is IRQ 4.
Any suggestions appreciated.