In an earlier post, there is an example of the RS232 (DB9) to USB adapter.
It is the Gigaware Serial – USB adapter. Over the years I have used some other adapters that have been less reliable.
Having several computers including notebooks and desktops, the other adapters were unreliable on some of the USB ports and computers.
Thoughts are that the USB port (interface combinations) on some of the computers could not handle the current load/voltage drop and thus would fail in communicating at the correct switching levels.
I have found the Gigaware Serial – USB adapter to be reliable on all of the notebooks and desktops in the shack.
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At one time, I resented the price on the Gigaware Serial – USB adapter. It costs around $20.00 compared to the cheaper $5 units. There is piece of mind in not having to worry about issues with the interface working, This has made the adapter worth the price. Another point is that over the past few years the price of the Gigaware Serial – USB adapter has remained pretty steady.
If you already have an interface and it works fine, that is great. If your looking for a new interface, consider the Gigaware Serial – USB adapter.
The Gigaware Serial – USB adapter is sometimes available on Amazon
RS232 Connection to Gigaware Rs232 to USB adapter (for Control) – and Netgear Router box with remains of a repaired Rascal Interface (Audio/Data).