A simple problem with complex solutions re rs 232

[Cedarviola]

Folks this is my first post here so please be kind

I have a Qt application (mature, legacy, call it what you will) that polls the serial port to see if a connection is made between CTS and RTS. This has been working for years to the customer's delight until he upgraded his hardware. And the new hardware has no serial support.

All the software wants to know is if an electrical switch is open or closed. Such a simple thing...

My question for the group is, is there a 'simple solution' for this?

I have tried one serial-USB converter that was an Epic Fail. Perhaps there are better?

Regards,
jim

[nish]

lot of apps create a virtual serial port (COMx) on windows. which eventually use the USB.