In your original post you talk about using USB. Don't expect to use USB link longer than a few meters. 10 or 20m is far to long for USB to work.
If the dialog is slow and you are poor use RS232. If you are rich use Zigbee.
In your original post you talk about using USB. Don't expect to use USB link longer than a few meters. 10 or 20m is far to long for USB to work.
If the dialog is slow and you are poor use RS232. If you are rich use Zigbee.