Let's assume that you have:
- Third-party application. It always opens and works with COM1 serial port. There is no way to change COM1 to another port from the application settings.
- COM1 is physically installed on this computer.
You want to get access and modify data stream between the application and COM1. If you could change application settings, you could create Connector (COM2), change app settings to COM2 and run your own application-bridge that connects COM1 and COM2, modifying data stream on-the-fly. But application settings cannot be changed! To solve this problem, you can use Mapper device.
- Add connector device (COM2)
- Add Mapper device (COM1 --> COM2)
That's all! Now third-party application will work with COM2 and your own application will be able to work as intended.
You have the same situation that is described in
Splitter: Share existing physical serial port between several applications. The only difference is that some applications do not allow to change their configurations, so Splitter device cannot help. In this case just add new VSPE device: Mapper (COM1 --> COM2). It will solve the problem. Please not, that Mapper must be created after Splitter, because on the contrary Splitter will not be able to work correctly.
