Which USB-COM port?

Larry C.

What determines the COM: port seen by the host computer when using FullDuplexSerial.spin to send ASCII strings via the USB adapter?

I have two Prop development boards, one USB version and one using the Prop Plug. Hyperterminal runs on my computer, as my user interface to pass data and commands to and from the Propeller board. (The boards are used independently, not simultaneously.) They come up as different serial ports.

The Prop Plug board looks like COM3 to the PC, but the USB board looks like COM4. What's that all about? and is there any way I can pin it down so both boards present the same interface? Or is that just built in to the chip in the USB-to-serial converter?

Thanks

Phil Pilgrim (PhiPi)

It's actually a function of the serial number programmed into the FTDI USB interface chip. If they were both the same, they'd both present as the same comm port. Every time Windows sees an adapter with a new serial number, it assigns it a new comm port number. You can fix this with FTDI's MPROG program. Just read the data from one adapter and copy it to the other. Et voila! Both will be assigned the same comm port, because Windows won't be able to tell them apart. (Just don't plug both of them in at the same time! I'm not sure what would happen then. Black hole maybe?)

-Phil

Cluso99

Suggest you try PST (Parallax Serial Terminal) as it handles DTR (DTR resets the prop) and can co-exist with PropTool (PST releases the COM port when it loses focus).

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Larry C.

CLuso99: I did download PST a while back, but haven't had a chance to try it yet. This sounds like a good reason to do so. Thanks.

Phil: Thanks to you also for the info. I wasn't aware of MPROG, but I checked out the manual on the FTDI web site, and it looks pretty easy to use.